• Environmental chemistry
• Production and application of biochar from agricultural and solid waste materials
• Carbon sequestration and climate change mitigation
• Environment friendly utilization of waste resources
• Remediation of contaminated soils and waters
• Revitalization of abandoned soils
• Wastewater treatment
• Waste management

Cumulative Impact Factor (2023): 450.7

Scopus h-index: 48

Scopus citations: 11,860

1.       Khan, B.A., Iqbal, S., Khattak, J.A., Bolan, N., Ahmad, M.* (2024) Enhancing the stability of soil contaminated with fluoride through the utilization of pristine and aluminium‒impregnated biochar: a comprehensive mechanistic approach. Environmental Science and Pollution Research 31:58445-58455 (2022 Impact Factor: 5.8)

2.       Rehman, H., Khan, A.H.A., Butt, T.A., Toqeer, M., Bilal, M., Ahmad, M., Al-Naghi, A.A.A., Latifee, E.R., Algassem, O.A.S., Iqbal, M. (2024) Synergistic biochar and Serratia marcescens tackle toxic metal contamination: A multifaceted machine learning approach. Journal of Environmental Management 370:122575 (2023 Impact Factor: 8.0)

3.       Idrees, M., Batool, S., Rasheed, H., Herath, I., Bundschuh, J., Niazi, N.K., Ahmad, M., Xu, J., Chen, D. (2024) Adsorption-coupled Fenton type reduction of bromate in water by high-yield polymer-derived ceramic-supported nano-zerovalent iron. Environmental Research 258:119419 (2023 Impact Factor: 7.7)

4.       Shahid, S., Imtiaz, H., Rashid, J., Xu, M., Vithanage, M., Ahmad, M.* (2024) Uptake, translocation, and nutrient efficiency of nano-bonechar as a plant growth regulator in hydroponics and soil systems. Environmental Research 251:118695 (2023 Impact Factor: 7.7)

5.       Imtiaz, H., Naeem, S., Ahmad, M.* (2024) Investigating the potential of nanobonechar towards climate-smart agriculture. Environmental Geochemistry and Health 46:128 (2023 Impact Factor: 3.2)

6.       Imtiaz, H., Khan, M., Khan, B.A., Shahid, S., Rajapaksha, A.U., Ahmad, M.* (2024) Uncovering nano-bonechar for attenuating fluoride in naturally contaminated soil. Chemosphere 353:141490 (2023 Impact Factor: 8.1)

7.       Khan, B.A., Ahmad, M.*, Bolan, N., Farooqi, A., Iqbal, S., Mickan, B., Solaiman, Z.M., Siddique, K.H.M. (2024) A mechanistic approach to arsenic adsorption and immobilization in aqueous solution, groundwater, and contaminated paddy soil using pine-cone magnetic biochar. Environmental Research 245:117922 (2023 Impact Factor: 7.7)

8.       Rehman, H., Rehman, W., Qu, Z., Ahmad, M., Yousaf, S., Iqbal, M. (2024) Electromagnetic biochar: a novel material for cadmium adsorption from industrial wastewater. International Journal of Environmental Science and Technology 21:747-756 (2023 Impact Factor: 3.0)

9.       Ekanayake, A., Rajapaksha, A.U., Ahmad, M., Vithanage, M. (2023) Enhanced adsorption of hexavalent chromium from aqueous solution by citric acid-modified biochar from invasive plant biomass. Water, Air and Soil Pollution 234:461 (2023 Impact Factor: 3.8)

10.   Khan, B.A., Ahmad, M.*, Iqbal, S., Ullah, F., Bolan, N., Solaiman, Z.M., Shafique, M.A., Siddique, K.H.M. (2023) Adsorption and immobilization performance of pine-cone pristine and engineered biochars for antimony in aqueous solution and military shooting range soil: An integrated novel approach. Environmental Pollution 317:120723 (2023 Impact Factor: 7.6)

11.   Bolan, N., Sarmah, A.K., Bordoloi, S., Bolan, S., Padhye, L., Zweiten, L.V., Sooriyakumar, P., Khan, B.A., Ahmad, M., Solaiman, Z., Rinklebe, J., Wang, H., Singh, B.P., Siddique, K.H.M. (2023) Soil acidification and the liming potential of biochar. Environmental Pollution 317:120632 (2023 Impact Factor: 7.6)

12.    Abbas, H., Ahmad, M.*, Iqbal, S., Rajapaksha, A.U. (2023) Exploitation of bio-waste by a conventionally designed pyrolyzer to produce bio-oil and bio-char. International Journal of Environmental Science and Technology 20:8963-8974 (2023 Impact Factor: 3.0)

13.   Khan, B.A., Ahmad, M.*, Iqbal, S., Bolan, N., Zubair, S., Shafique, M.A., Shah, A. (2022). Effectiveness of the engineered pinecone-derived biochar for the removal of fluoride from water. Environmental Research 212:113540 (2023 Impact Factor: 7.7)

14.   Zhang, M., Lin, K., Zhong, Y., Zhang, D., Ahmad, M., Yu, J., Fu, H., Xu, L., Wu, S., Huang, L. (2022) Functionalizing biochar by co-pyrolysis shaddock peel with red mud for removing acid orange 7 from water. Environmental Pollution 299:118893 (2023 Impact Factor: 7.6)

15.     Saleem, H., Ahmad, M.*, Rashid, J., Ahmad, M., Al-Wabel, M.I., Amin, M. (2022) Carbon potential of different biochars derived from solid-waste in saline soil. Pedosphere 32:283-293  (2023 Impact Factor: 5.7)

16.     Rajapaksha, A.U., Selvasembian, R., Ashiq, A., Gunarathne, V., Ekanayake, A., Perera, V.O., Wijesekera, H., Mia, S., Ahmad, M., Vithanage, M., Ok, Y.S. (2022). A systematic review on adsorptive removal of hexavalent chromium from aqueous solutions: Recent advances. Science of the Total Environment 809:152055 (2023 Impact Factor: 8.2)

17.     Murad, H.A., Ahmad, M.*, Bundschuh, J., Hashimoto, Y., Zhang, M., Sarkar, B., Ok, Y.S. (2022). A remediation approach to chromium contaminated water and soil using engineered biochar derived from peanut shell. Environmental Research 204:112125 (2023 Impact Factor: 7.7)

18.     Akhtar, L., Ahmad, M.*, Iqbal, S., Abdelhafez, A.A., Mehran, M.T. (2021) Biochars’ adsorption performance towards moxifloxacin and ofloxacin in aqueous solution: Role of pyrolysis temperature and biomass type. Environmental Technology & Innovation 24:101912 (2023 Impact Factor: 6.7)

19.   Idrees, M., Batool, S., Javed, M.S., Ahmad, M.*, Khan, Q.U., Imran, M., Rasaki, S.A., Mwizerwa, J.P., Chen, Z. (2021) Adsorption and electrochemical facet of polymer precursor to yield mesoporous carbon ceramic. Separation and Purification Technology 275:119199 (2023 Impact Factor: 8.1)

20.   Atugoda, T., Gunawardane, C., Ahmad, M., Vithanage, M. (2021) Mechanistic interaction of ciprofloxacin on zeolite modified seaweed (Sargassum crassifolium) derived biochar: Kinetics, isotherm and thermodynamics. Chemosphere 281:130676 (2023 Impact Factor: 8.1)

21.   Abdelhafez, A.A., Zhang, X., Zhou, L., Cai, M., Cui, N., Chen, G., Zou, G., Abbas, M.H.H., Kinawy, M.H.M., Ahmad, M., Al-Harthy, S.S., Hamed, M.H. (2021) Eco-friendly production of biochar via conventional pyrolysis: application of biochar and liquefied smoke for plant productivity and seed germination. Environmental Technology & Innovation 22:101540 (2023 Impact Factor: 6.7)

22.   Fatima, I., Ahmad M.*, Vithanage, M., Iqbal, S. (2021) Abstraction of nitrates and phosphates from water by sawdust- and rice husk-derived biochars: their potential as N- and P-loaded fertilizer for plant productivity in nutrient deficient soil. Journal of Analytical and Applied Pyrolysis 155:105073 (2023 Impact Factor: 5.8)

23.   Amin, M., Ahmad, M.*, Farooqi, A., Hussain, Q., Ahmad, M., Al-Wabel, M. I., Saleem, H. (2020) Arsenic release in contaminated soil amended with unmodified and modified biochars derived from sawdust and rice husk. Journal of Soils and Sediments 20:3358-3367 (2023 Impact Factor: 2.8)

24.    Batool, S., Idrees, M., Ahmad, M., Hussain, Q., Ahmad, M.*, Iqbal, A., Kong, J. (2020) Design and characterization of biomass template/tin oxide nanocomposite for enhanced adsorption of 2,4-dichlorophenol. Environmental Research 181:108955 (2023 Impact Factor: 7.7)

25.    Rashid, J., Azam, R., Kumar, R., Ahmad, M., Rehman, A., Barakat, M. A. (2019) Sulfonated polyether sulfone reinforced multiwall carbon nanotubes composite for the removal of lead in wastewater. Applied Nanoscience 9:1695-1705

26.    Ahmad, M., Ahmad, M., Usman, A.R.A., Al-Faraj, A.S., Abduljabbar, A., Ok, Y.S., Al-Wabel, M.I. (2019) Date palm waste-derived biochar composites with silica and zeolite: synthesis, characterization and implication for carbon stability and recalcitrant potential. Environmental Geochemistry and Health 41:1687-1704 (2023 Impact Factor: 3.2)

27.   El-Naggar, A., Lee, S.S., Rinklebe, J., Farooq M., Song, H., Sarmah, A.K., Zimmerman, A.R., Ahmad, M., Shaheen, S.M., Ok, Y.S. (2019) Biochar application to low fertility soils: A review of current status, and future prospects. Geoderma 337:536-554 (2023 Impact Factor: 5.6)

28.   Batool, S., Idrees, M., Al-Wabel, M.I., Ahmad, M., Hina, K., Ullah, H., Cui, L., Hussain, Q. (2019) Sorption of Cr(III) from aqueous media via naturally functionalized microporous biochar: Mechanistic study. Microchemical Journal 144:242-253 (2023 Impact Factor: 4.9)

29.   Al-Wabel, M.I., Rafique, M.I., Ahmad, M., Ahmad, M., Usman, A.R.A. (2019) Pyrolytic and hydrothermal carbonization of date palm leaflets: Characteristics and ecotoxicological effects on seed germination of lettuce. Saudi Journal of Biological Sciences 26:665-672

30.   Idrees, M., Batool, S., Ullah, H., Hussain, Q., Al-Wabel, M.I., Ahmad, M., Hussain, A., Riaz, M., Ok, Y.S., Kong, J. (2018) Adsorption and thermodynamic mechanisms of manganese removal from aqueous media by biowaste-derived biochars. Journal of Molecular Liquids 266:373-380 (2023 Impact Factor: 5.3)

31.   Vithanage, M., Bandara, T., Al-Wabel, M.I., Abduljabbar, A., Usman, A.R.A., Ahmad, M., Ok, Y.S. (2018) Soil enzyme activities in waste biochar amended multi-metal contaminated soil: Effect of different pyrolysis temperatures and application rates. Communications in Soil Science and Plant Analysis 49:635-643 (2023 Impact Factor: 1.3)

32.   Kumarathilaka, P., Ahmad, M., Herath, I., Mahatantila, K., Athapattu, B.C.L., Rinklebe, J., Ok, Y.S., Usman, A., Al-Wabel, M.I., Abduljabbar, A., Vithanage, M. (2018) Influence of bioenergy waste biochar on proton- and ligand-promoted release of Pb and Cu in a shooting range soil. Science of the Total Environment 625:547-554 (2023 Impact Factor: 8.2)

33.   Ahmad, M., Ahmad, M., Usman, A.R.A., Al-Faraj, A.S., Ok, Y.S., Hussain, Q., Abduljabbar, A., Al-Wabel, M.I. (2018) An efficient phosphorus scavenging from aqueous solution using magnesiothermally modified bio-calcite. Environmental Technology 39:1638-1649 (2023 Impact Factor: 2.2)

34.   Ahmad, M., Usman, A.R.A., Al-Faraj, A.S., Ahmad, M., Sallam, A., Al-Wabel, M.I. (2018) Phosphorus-loaded biochar changes soil heavy metals availability and uptake potential of maize (Zea mays L.) plants. Chemosphere 194:327-339 (2023 Impact Factor: 8.1)

35.   Al-Wabel, M., Hussain, Q., Usman, A.R.A., Ahmad, M., Abduljabbar, A., Abdulazeem, S., Ok, Y.S. (2018) Impact of biochar properties on soil conditions and agricultural sustainability: A review. Land Degradation & Development 29:2124-2161 (2023 Impact Factor: 3.6)

36.   Ahmad, M., Ahmad, M., Usman, A.R.A., Al-Faraj, A.S., Abduljabbar, A.S., Al-Wabel, M.I. (2018) Biochar composites with nano zerovalent iron and eggshell powder for nitrate removal from aqueous solution with coexisting chloride ions. Environmental Science and Pollution Research 25:25757-25771 (2023 Impact Factor: 5.8)

37.   Ahmad, M., Ahmad, M., El-Naggar, A.H., Usman, A.R.A., Abduljabbar, A., Vithanage, M., Elfaki, J., Al-Faraj, A. and Al-Wabel, M.I. (2018) Aging effect of organic and inorganic fertilizers on phosphorus fractionation in a calcareous sandy loam soil. Pedosphere 28:873-883 (2023 Impact Factor: 5.7)

38.   Karunanithi, R., Ok, Y.S., Dharmarajan, R., Ahmad, M., Seshadri, B., Bolan, N., Naidu, R. (2017). Sorption, kinetics and thermodynamics of phosphate sorption onto soybean stover derived biochar. Environmental Technology & Innovation 8:113-125 (2023 Impact Factor: 6.7)

39.   Hussain, A., Al-Barakah, F.N., Al-Sewailem, M., El-Saeid, M.H., Waqar, M., Ahmad, M. (2017) Oxidative photodegradation of pyrene and fluoranthene by Fe-based and Zn-based Fenton reagents. Sustainability 2017, 9, 870; DOI:10.3390/su9050870 (2023 Impact Factor: 3.3)

40.   Vithanage, M., Seneviratne, M., Ahmad, M., Sarkar, B., Ok, Y.S. (2017) Contrasting effects of engineered carbon nanotubes on plants: a review. Environmental Geochemistry and Health 39:1421-1439 (2023 Impact Factor: 3.2)

41.   Al-Wabel, M.I., Sallam, A.E.S., Usman, A.R.A., Ahmad, M., El-Naggar, A.H., El-Saeid, M.H., Al-Faraj, A., El-Enazi, K., Al-Romian, F.A. (2017) Trace metal levels, sources, and ecological risk assessment in a densely agricultural area from Saudi Arabia. Environmental Monitoring and Assessment 189:252-272 (2023 Impact Factor: 2.9)

42.   Ahmad, M., Lee S.S., Lee, S.E., Al-Wabel, M.I., Tsang, D.C.W., Ok, Y.S. (2017) Biochar-induced changes in soil properties affected immobilization/mobilization of metals/metalloids in contaminated soils. Journal of Soils and Sediments 17:717-730 (2023 Impact Factor: 2.8)

43.   Herath, I., Iqbal, M.C.M., Al-Wabel, M.I., Abduljabbar, A., Ahmad, M., Usman, A.R.A., Ok, Y.S. and Vithanage, M. (2017) Bioenergy-derived waste biochar for reducing mobility, bioavailability, and phytotoxicity of chromium in anthropized tannery soil. Journal of Soils and Sediments 17:731-740 (2023 Impact Factor: 2.8)

44.   Usman, A., Sallam, A., Zhang, M., Vithanage, M., Ahmad, M., Al-Faraj, A., Ok, Y.S., Abduljabbar, A., Al-Wabel, M. (2016) Sorption process of date palm biochar for aqueous Cd (II) removal: efficiency and mechanisms. Water Air and Soil Pollution 227:449-464 (2023 Impact Factor: 3.8)

45.   Idrees, M., Batool, S., Hussain, Q., Ullah, H., Al-Wabel, M.I., Ahmad, M., Kong, J. (2016) High efficiency remediation of cadmium (Cd²⁺) from aqueous solution using poultry manure- and farmyard manure-derived biochars. Separation Science and Technology 51:2307-2317(2023 Impact Factor: 2.3)

46.   Al-Wabel, M.I., El-Saeid, M.H., Usman, A.R.A., Al-Turki, A.M., Ahmad, M., Hassanin, A.S., El-Naggar, A.H., Al-Enazi, K.K.H. (2016) Identification, quantification and toxicity of PCDDs and PCDFs in soils from industrial areas in the central and eastern regions of Saudi Arabia. Bulletin of Environmental Contamination and Toxicology 96:622-669 (2023 Impact Factor: 2.7)

47.   Herath, I., Kumarathilaka, P., Al-Wabel, M.I., Abduljabbar, A., Ahmad, M., Usman, A.R.A. and Vithanage, M. (2016) Mechanistic modelling of glyphosate interaction with rice husk derived engineered biochar. Microporous & Mesoporous Materials 225:280-288 (2023 Impact Factor: 4.8)

48.   El-Naggar, A.H., Alzhrani, A.K.R., Ahmad, M., Usman, A.R.A., Mohan, D., Ok, Y.S. and Al-Wabel, M.I. (2016) Preparation of activated and non-activated carbon from conocarpus pruning waste as low cost adsorbent for heavy metal ions removal from aqueous solution. BioResources 11:1092-1107 (2023 Impact Factor: 1.7)

49.   Ahmad, M., Ok, Y.S., Kim, B.Y., Ahn, J.H., Lee, Y.H., Zhang, M., Moon, D.H., Al-Wabel, M.I., Lee, S.S. (2016) Impact of soybean stover- and pine needles-derived biochars on Pb and As mobility, microbial community, and carbon stability in a contaminated agricultural soil. Journal of Environmental Management 166:131-139 (2023 Impact Factor: 8.0)

50.   Ahmad, M., Ok, Y.S., Rajapaksha, A.U., Lim, J.E., Kim, B.Y., Lee, Y.H., Al-Wabel, M.I., Lee, S.E., Lee, S.S. (2016). Lead and copper immobilization in a shooting range soil using soybean stover- and pineneedle-derived biochars: chemical, microbial and spectroscopic assessments. Journal of Hazardous Materials 301:179-186 (2023 Impact Factor: 12.2)

51.   Mayakaduwa, S.S., Kumarathilaka, P., Herath, I., Ahmad, M., Al-Wabel, M.I., Ok, Y.S., Vithanage, M. (2016). Equilibrium and kinetic mechanisms of woody biochar on aqueous glyphosate removal. Chemosphere 144:2516-2521 (2023 Impact Factor: 8.1)

52.   Usman, A.R.A., Al-Wabel, M.I., Ok, Y.S., Al-Harbi, A., Wahb-Allah, M.A., El-Naggar, A.H., Ahmad, M. and Al-Omran, A. (2016). Conocarpus biochar induced changes in soil nutrients availability and tomato growth under saline irrigation system. Pedosphere 26:27-38 (2023 Impact Factor: 5.7)

53.   Usman, A.R.A., Ahmad, M., El-Mahrouky, M., Al-Omran, A., Ok, Y.S., Sallam, A.S., El-Naggar, A.H., Al-Wabel, M.I. (2015). Chemically modified biochar produced from Conocarpus waste increases NO₃ removal from aqueous solutions. Environmental Geochemistry and Health 38:511-521 (2023 Impact Factor: 3.2)

54.   Usman, A.R.A., Abduljabbar, A., Vithanage, M., Ok, Y.S., Ahmad, M., Ahmad, M., Elfaki, J., Abdulazeem, S.S., Al-Wabel, M.I. (2015). Biochar production from date palm waste: Charring temperature induced changes in carbon stability and surface chemistry. Journal of Analytical and Applied Pyrolysis 115:392-400 (2023 Impact Factor: 5.8)

55.   Zhang, M., Ahmad, M., Al-Wabel, M.I., Vithanage, M., Rajapaksha, A.U., Kim, H.S., Lee, S.S. and Ok, Y.S. (2015) Adsorptive removal of trichloroethylene in water by crop residue biochars pyrolyzed at contrasting temperatures: Continuous fixed-bed experiments. Journal of Chemistry Article ID 647072 (2023 Impact Factor: 2.8)

56.   El-Najjar, A.H., Usman, A.R.A., Al-Omran, A., Ok, Y.S., Ahmad, M., Al-Wabel, M.I. (2015) Carbon mineralization and nutrients availability in calcareous sandy soils amended with woody waste biochar. Chemosphere 138:67-73 (2023 Impact Factor: 8.1)

57.   Rajapaksha, A.U., Ahmad, M., Vithanage, m., Kim, K.R., Chang, J.Y., Lee, S.S. and Ok, Y.S. (2015) The role of biochar, natural iron oxides, and nanomaterials as soil amendments for immobilizing metals in shooting range soil. Environmental Geochemistry and Health 37:931-942. (2023 Impact Factor: 3.2)

58.   Rajapaksha, A.U., Vithanage, M., Ahmad, M., Seo, D.C., Cho, J.S., Lee, S.E., Lee, S.S. and Ok, Y.S. (2015) Enhanced sulfamethazine removal by steam activated invasive-plant-derived biochar. Journal of Hazardous Materials 290:43-50 (2023 Impact Factor: 12.2)

59.   Vithanage, M., Rajapaksha, A.U., Ahmad, M., Uchimiya, M., Dou, X., Alessi, D.S. and Ok, Y.S. (2015) Mechanisms of antimony adsorption onto soybean stover-derived biochar in aqueous solutions. Journal of Environmental Management 151:443-449 (2023 Impact Factor: 8.0)

60.   Rajapaksha, A.U., Vithanage, M., Zhang, M., Ahmad, M., Mohan, D., Chang, S.X. and Ok, Y.S. (2014) Pyrolysis conditions affected sulfamethazine sorption by tea waste biochars. Bioresource Technology 166:303-308 (2023 Impact Factor: 9.7)

61.   Zhang, M., Ahmad, M., Lee, S.S., Xu, L.H., Ok, Y.S. (2014) Sorption of polycyclic aromatic hydrocarbons to lignin: effect of chemical hydrophobicity and temperature. Bulletin of Environmental Contamination and Toxicology 93:84-88 (2023 Impact Factor: 2.7)

62.   Ahmad, M., Vithanage, M., Kim, K., Cho, J.S., Lee, Y.H., Joo, Y.K., Lee, S.S. and Ok, Y.S. (2014) Inhibitory effect of veterinary antibiotics on denitrification in groundwater: A microcosm approach. The Scientific World Journal 2014:7 pages, article ID879831

63.   Ahmad, M., Rajapaksha, A.U., Lim, J.E., Zhang, M., Bolan, N., Mohan, D., Vithanage, M., Lee, S.S. and Ok, Y.S. (2014) Biochar as a sorbent for contaminant management in soil and water: a review. Chemosphere 99:19-33 (2023 Impact Factor: 8.1)

64.   Ahmad, M., Lee, S.S., Lim, J.E., Lee, S.E., Cho, J.S., Moon, D.H., Hashimoto, Y. and Ok, Y.S. (2014) Speciation and phytoavailability of lead and antimony in a small arms range soil amended with mussel shell, cow bone and biochar: EXAFS spectroscopy and chemical extractions. Chemosphere 95:433-441. (2023 Impact Factor: 8.1)

65.   Ahmad, M., Moon, D.H., Lee, S.S., Vithanage, M., Koutsospyros, A. and Ok, Y.S. (2014) Production and use of biochar from buffalo-weed (Ambrosia trifida) for trichloroethylene removal from water. Journal of Chemical Technology and Biotechnology 89:150-157 (2023 Impact Factor: 2.8)

66.   Almaroi, Y.A., Usman, A.R.A., Ahmad, M., Lee, S.S., Moon, D.H., Ok, Y.S. (2014) Effects of biochar, cow bone and eggshell on Pb availability to maize in contaminated soil irrigated with saline water. Environmental Earth Sciences 71:1289-1296 (2023 Impact Factor: 2.8)

67.   Saifullah, Sarwar, N., Bibi, S., Ahmad, M., Ok, Y.S. (2014) Effectiveness of zinc application to minimize cadmium toxicity and accumulation in wheat (Triticum aestivum L.). Environmental Earth Sciences 71:1663-1672 (2023 Impact Factor: 2.8)

68.   Ahmad, M., Lee, S.S., Rajapaksha, A.U., Vithanage, M., Zhang, M. and Ok, Y.S. (2013) Trichloroethylene adsorption by pine needle biochars produced at various pyrolytic temperatures. Bioresource Technology 143:615-622 (2023 Impact Factor: 9.7)

69.   Moon, D.H., Park, J.W., Chang, Y.Y., Ok, Y.S., Lee, S.S., Ahmad, M., Koutsospyros, A., Park, J.H. and Baek, K. (2013) Immobilization of lead in contaminated firing range soil using biochar. Environmental Science and Pollution Research 20:8464-8471. (2023 Impact Factor: 5.8)

70.   Ahmad, M., Lee, S.S., Oh, S.E., Mohan, D., Moon, D.H., Lee, Y.H. and Ok, Y.S. (2013) Modeling adsorption kinetics of trichloroethylene onto biochars derived from soyben stover and peanut shell wastes. Environmental Science and Pollution Research 20:8364-8373. (2023 Impact Factor: 5.8)

71.   Yang, J.E., Skogley, E.O., Ahmad, M. and Ok, Y.S. (2013) Carbonaceous resin capsule for vapor-phase monitoring of volatile hydrocarbons in soil: partitioning and kinetic model verification. Environmental Geochemistry and Health 35:715-725. (2023 Impact Factor: 3.2)

72.   Usman, A.R.A., Almaroai, Y., Ahmad, M., Vithanage, M. and Ok, Y.S. (2013) Toxicity of synthetic chelators and heavy metal availability in poultry manure amended Pb and As contaminated agricultural soil. Journal of Hazardous Materials, 262:1022-1030. (2023 Impact Factor: 12.2)

73.   Ahmad, M., Moon, D.H., Wazne, M. and Ok, Y.S. (2013) Effects of natural and calcined oyster shells on antimony solubility in shooting range soil. Journal of the Korean Society for Applied Biological Chemistry 56:461-464.

74.   Abd El-Azeem, S.A.M., Ahmad, M., Usman, A.R.A., Kim, K.R., Oh, S.E., Lee, S.S. and Ok, Y.S. (2013) Changes of biochemical properties and heavy metal availability in soil treated with natural liming materials. Environmental Earth Sciences 70:3411-3420. (2023 Impact Factor: 2.8)

75.   Lim, J.E., Ahmad, M., Lee, S.S., Shope, C.L., Hashimoto, Y., Kim, K.R., Usman, A.R.A., Yang, J.E. and Ok, Y.S. (2013) Effects of lime-based waste materials on immobilization and phytoavailability of Cd and Pb in contaminated soil. CLEAN - Soil, Air, Water 41:1235-1241. (2023 Impact Factor: 1.5)

76.   Almaroai, Y.A., Usman, A.R.A., Ahmad, M., Kim, K.R., Vithanage, M. and Ok, Y.S. (2013) Role of chelating agents on release kinetics of metals and their uptake by maize from chromated copper arsenate-contaminated soil. Environmental Technology 34:747-755. (2023 Impact Factor: 2.2)

77.   Lim, J.E., Ahmad, M., Usman, A.R.A., Lee, S.S., Jeon, W.T., Oh, S.E., Yang, J.E. and Ok, Y.S. (2013) Effects of natural and calcined poultry waste on Cd, Pb and As mobility in contaminated soil. Environmental Earth Sciences 69:11-20. (2023 Impact Factor: 2.8)

78.   Almaroai, Y.A., Usman, A.R.A., Ahmad, M., Kim, K.R., Lee, S.S. and Ok, Y.S. (2012) Effects of synthetic chelators and low molecular weight organic acids on chromium, copper, and arsenic uptake and translocation in maize (Zea mays L.). Soil Science 177:655-663. (2023 Impact Factor: 1.7)

79.   Ahmad, M., Moon, D.H., Lim, K.J., Shope, C.L., Lee, S.S., Usman, A.R.A., Kim, K.R., Park, J.H., Hur, S.O., Yang, J.E. and Ok, Y.S. (2012) An assessment of the utilization of waste resources for the immobilization of Pb and Cu in the soil from a Korean military shooting range. Environmental Earth Sciences 67:1023-1031. (2023 Impact Factor: 2.8)

80.   Ahmad, M., Lee, S.S., Dou, X., Mohan, D., Sung, J.K., Yang, J.E. and Ok, Y.S. (2012) Effects of pyrolysis temperature on soybean stover- and peanut shell-derived biochar properties and TCE adsorption in water. Bioresource Technology 118:536-544. (2023 Impact Factor: 9.7)

81.   Ahmad, M., Lee, S.S., Yang, J.E., Ro, H.M., Lee, Y.H. and Ok, Y.S. (2012) Effects of soil dilution and amendments (mussel shell, cow bone, and biochar) on Pb availability and phytotoxicity in military shooting range soil. Ecotoxicology and Environmental Safety 79:225-231. (2023 Impact Factor: 6.2)

82.   Ahmad, M., Hashimoto, Y., Moon, D.H., Lee, S.S. and Ok, Y.S. (2012) Immobilization of lead in a Korean military shooting range soil using eggshell waste: an integrated mechanistic approach. Journal of Hazardous Materials 209-210:392-401. (2023 Impact Factor: 12.2)

83.   Ahmad, M., Usman, A.R.A., Lee, S.S., Kim, S.C., Joo, J.H., Yang, J.E. and Ok, Y.S. (2012) Eggshell and coral wastes as low cost sorbents for the removal of Pb²⁺, Cd²⁺ and Cu²⁺ from aqueous solutions. Journal of Industrial and Engineering Chemistry 18:198-204. (2023 Impact Factor: 5.9)

84.   Ok, Y.S., Oh, S.E., Ahmad, M., Hyun, S., Kim, K.R., Moon, D.H., Lee, S.S., Lim, K.J., Jeon, W.T. and Yang, J.E. (2010) Effects of natural and calcined oyster shells on Cd and Pb immobilization in contaminated soils. Environmental Earth Sciences 61:1301-1308. (2023 Impact Factor: 2.8)

85.   Ahmad, M., Tariq, M., Shafiq, T., Nasir, A. (2009) Coagulation/adsorption combined treatment of slaughterhouse wastewater. Desalination and Water Treatment 12:270-275. (2023 Impact Factor: 1.0)

86.   Ahmad, M., Tariq, M., Shafiq, T. (2007) Temporal evaluation of effluent treatment plant (ETP) and treatment of sludge produced by ETP. Journal of the Chemical Society of Pakistan 29:211-216. (2023 Impact Factor: 0.6)

87. Ahmad, M., Usman, M., Nasir, A., Shafiq, T. (2006) Dispersion gradient of free fall dust and heavy metal elements concentration in dust along a main road. Journal of the Chemical Society of Pakistan. 28:567-575. (2023 Impact Factor: 0.6)

1. Member of the organizing committee of International Conference on Waste Business and Management held on Sep 12 – 13, 2023 at Quaid-i-Azam University

2. Member of the organizing committee of 1^st International Conference on Climate Change & Environment held on Feb 2 – 3, 2022 at Quaid-i-Azam University

3. 1^st International Conference on "Climate Change and Environment", Quaid-i-Azam University, Islamabad, Pakistan (February 2 – 3, 2022)
4. 1^st International Conference on “Soil and Crop Health in Changing Climate”. MNS-University of Agriculture, Multan – Pakistan (November 28 – 29, 2018)
5. Asia-Pacific Environment Forum 2018, Chuncheon, Korea (October 15 – 18, 2018)
6. CLEAR 2014, 2nd International Conference on Contaminated Land, Ecological Assessment and Remediation, Chuncheon, Korea(October 5-8, 2014)
7. 1^st International Conference on Contaminated Land, Ecological Assessment and Remediation. Hangzhou, China (Nov 4 – 8, 2012)
8. The 4^th IBI Biochar Congress in Beijing, China (Sep 16 – 20, 2012)
9. 2012 International Forum on Green Technology and Phytoremediation for Contaminated Sites at Taipei, Taiwan (Jun 25, 2012)
10. 2011 International Symposium on Biochar for Climate Change Mitigation & Soil and Environmental Management at Kangwon National University, Republic of Korea (Dec 8 – 9, 2011)
11. 2011 International Symposium & Annual Meeting of the KSABC at Jeju, Republic of Korea (Oct 20 – 22, 2011)
12. KSEA’s 30^th Anniversary International Symposium on Environment and Food Safety for the Future Generation at Jeju, Republic of Korea (Jul 7 – 9, 2011)
13. 2011Annual Meeting of the Korean Society of Soil Science and Fertilizer at Moju, Republic of Korea (May 19 – 20, 2011)
14. 2010 SETAC Asia/Pacific Meeting at Guangzhou, China (Jun 4 – 7, 2010)
15. 7^th International AFAS Joint Symposium between Korea and Japan. Current Status and Perspectives of Agriculture, Forestry, and Animal Sciences in 2010 at Chuncheon, Republic of Korea (Nov 11, 2010).
16. 2010 Annual Meeting of the Korean Society of Soil Science and Fertilizer at Hongcheon, Republic of Korea (May 6 – 7, 2010)
17. The 9^th International Conference of the East and Southeast Asia Federation of Soil Science Societies at Seoul, Republic of Korea (Oct 27, 2009)
18. 6^th International and 16^th National Conference of Chemistry at Bahuddin Zakariya University, Multan, Pakistan (Apr 4 – 6, 2006)