Professor Yong Sik Ok is a Full Professor and Research Director (Global) of Korea University in Seoul, Korea. His academic background covers waste management, bioavailability of emerging contaminants, and bioenergy and value-added products such as biochar. Professor Ok also has experience in fundamental soil science and remediation of various contaminants in soils and sediments. Together with graduate students and colleagues, Professor Ok has published over 600 research papers, 41 of which were ranked as Web of Science ESI top papers (38 nominated as "Highly Cited Papers" and 3 nominated as "Hot Papers"). Professor Ok is also recognized as a 2018 Web of Science Highly Cited Researcher. He maintains a worldwide professional network through his service as a Co-Editor in Chief of Journal of Hazardous Materials, Co-Editor for Critical Reviews in Environmental Science and Technology and as associate editor for Environmental Pollution and Bioresource Technology, and as a member of the editorial boards of Renewable and Sustainable Energy Reviews, Chemical Engineering Journal, Chemosphere, Journal of Analytical and Applied Pyrolysis and several other top journals.

Professor Ok has served in a number of positions worldwide, including honorary professor at The University of Queensland, Australia, visiting professor at the Tsinghua University, China, adjunct professor at the University of Wuppertal, Germany, and guest professor at the Ghent University, Belgium. He currently serves as the Director of Association of Pacific Rim Universities (APRU) Sustainable Waste Management Program. Professor Ok has served as chairman of numerous major conferences such as Engineering Sustainable Development 2019 organised by the American Institute of Chemical Engineers (AIChE) Institute for Sustainability and the APRU.

Publications (> 600 Journal Articles, Scopus Author ID: 7003403766, ORCID: http://orcid.org/0000-0003-3401-0912)

Highly Cited Papers (Data from Essential Science Indicators. As of July 2019, these highly cited papers received enough citations to place them in the top of the academic field of engineering, environment/ ecology, biology and biochemistry, plant and animal science, geoscience and agricultural science based on a highly cited threshold for the field and publication year)

  1. 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 (Impact Factor: 5.108) (JCR Top 20% (Q1), Environmental Sciences: 32/250)  (*Corresponding Author) (Times cited: 1,053 from Web of Science Core Collection)
  2. Mohan, D., Sarswat, A., Ok, Y.S. and Pittman, C.U. (2014). Organic and inorganic contaminants removal from water with biochar, a renewable, low cost and sustainable adsorbent-A critical review. Bioresource Technology, 160:191-202 (IF 6.669) (JCR Top 10% (Q1), Agricultural Engineering: 1/13) (Times cited: 687 from Web of Science Core Collection)
  3. 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 (IF 6.669) (JCR Top 10% (Q1), Agricultural Engineering: 1/13) (*Corresponding Author) (Times cited: 358 from Web of Science Core Collection)
  4. Inyang, M.I., Gao, B., Yao, Y., Xue, Y., Zimmerman, A., Mosa, A., Pullammanappallil, P., Ok, Y.S. and Cao, X. (2016). A review of biochar as a low-cost adsorbent for aqueous heavy metal removal. Critical Reviews in Environmental Science and Technology, 46(4):406-433 (IF 7.683) (JCR Top 2.5% (Q1), Environmental Sciences: 16/229) (Times cited: 224 from Web of Science Core Collection)
  5. Rajapaksha, A.U., Chen, S.S., Tsang, D.C.W., Zhang, M., Vithanage, M., Mandal, S., Gao, B., Bolan, N.S. and Ok, Y.S.* (2016). Engineered/designer biochar for contaminant removal/immobilization from soil and water: Potential and implication of biochar modification. Chemosphere, 148:276-291 (Impact Factor: 5.108) (JCR Top 20% (Q1), Environmental Sciences: 32/250) (*Corresponding Author) (Times cited: 218 from Web of Science Core Collection)
  6. Stefaniuk, M., Oleszczuk, P. and Ok, Y.S. (2016). Review on nano zerovalent iron (nZVI): From synthesis to environmental applications. Chemical Engineering Journal, 287:618-632 (IF 8.355) (JCR Top 5% (Q1), Engineering, Chemical: 6/138 (Times cited: 172 from Web of Science Core Collection)
  7. Yang, Y., Ok, Y.S., Kim, K.H., Kwon, E.E., Tsang, Y.F. (2017). Occurrences and removal of pharmaceuticals and personal care products (PCPPs) in drinking water and water/sewage treatment plants: A Review. Science of the Total Environment, 596: 303-320. (Impact Factor: 5.589) (JCR Top 15% (Q1), Environmental Sciences: 27/250) (Times cited: 162 from Web of Science Core Collection)
  8. Park, J.H., Ok, Y.S., Kim, S.H., Cho, J.S., Heo, J.S., Delaune, R.D. and Seo, D.C. (2016) Competitive adsorption of heavy metals onto sesame straw biochar in aqueous solutions. Chemosphere, 142:77-83 (Impact Factor: 5.108) (JCR Top 20% (Q1), Environmental Sciences: 32/250) (Times cited: 146 from Web of Science Core Collection)
  9. Lu, K., Yang, X., Gielen, G., Bolan, N., Ok, Y.S., Niazi, N.K., Xu, S., Yuan, G., Chen, X., Zhang, X., Liu, D., Song, Z., Liu, X. and Wang, H. (2017). Effect of bamboo and rice straw biochars on the mobility and redistribution of heavy metals (Cd, Cu, Pb and Zn) in contaminated soil. Journal of Environmental Management, 186(2):285-292 (IF 4.865) (JCR Top 15% (Q1), Environmental Sciences: 37/250) (Times cited: 118 from Web of Science Core Collection)
  10. Antoniadis, V., Levizou, E., Shaheen, S.M., Ok, Y.S., Sebastian, A., Baum, C., Prasad, M.N.V., Wenzel, W.W., Rinklebe, J. (2017). Trace Elements in the soil-plant interface: Phytoavailability, translocation, and phytoremediation-A Review. Earth Science Reviews 171: 621-645. (IF 7.339). (JCR Top 25% (Q1) (Times cited: 96 from Web of Science Core Collection)
  11. 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 (Impact Factor: 7.650) (JCR Top 1% (Q1), Environmental Science: 12/250) (*Corresponding Author) (Times cited: 93 from Web of Science Core Collection)
  12. Rizwan, M., Ali, S., Abbas, T., Zia-ur-Rehman, M., Hannan, F., Keller, C., Al-Wabel, M.I. and Ok, Y.S. (2016). Cadmium minimization in wheat: A critical review. Ecotoxicology and Environmental Safety, 130:43-53 (IF 3.974) (JCR Top 20% (Q1), Environmental Sciences: 49/241) (Times cited: 94 from Web of Science Core Collection)
  13. Choppala, G., Saifullah, Bolan, N., Bibi, S., Iqbal, M., Rengel, Z., Kunhikrishnan, A., Ashwath, N. and Ok, Y.S. (2014). Cellular mechanisms in higher plants governing tolerance to cadmium toxicity. Critical Reviews in Plant Sciences, 33:374-391 (IF 6.162) (JCR Top 5% (Q1), Plant Science: 10/222) (Times cited: 91 from Web of Science Core Collection)
  14. Abbas, T., Rizwan, M., Ali, S., Zia-ur-Rehman, M., Qayyum, M.F., Abbas, F., Hannan, F., Rinklebe, J. and Ok, Y.S. (2017). Effect of biochar on cadmium bioavailability and uptake in wheat (Triticum aestivum L.) grown in a soil with aged contamination. Ecotoxicology and Environmental Safety, 140:37-47 (IF 4.527) (JCR Top 20% (Q1), Environmental Sciences: 44/250) (Times cited: 82 from Web of Science Core Collection)
  15. Rizwan, M., Ali, S., Qayyum, M.F., Ok, Y.S., Adrees, M., Ibrahim, M, Zia-ur-Rehman, M., Farid, M. and Abbas, F. (2017). Effect of metal and metal oxide nanoparticles on growth and physiology of globally important food crops: A critical review. Journal of Hazardous Materials, 322:2-16 (Impact Factor: 7.650) (JCR Top 1% (Q1), Environmental Science: 12/250)(Times cited: 74 from Web of Science Core Collection)
  16. Rizwan, M., Ali, S., Adrees, M., Ibrahim, M., Tsang, D.C.W., Zia-ur-Rehman, M., Zahir, Z.A., Rinklebe, J., Tack, F.M.G. and Ok, Y.S.* (2017). A critical review on effects, tolerance mechanisms and management of cadmium in vegetables. Chemosphere, 182:90-105 (Impact Factor: 5.108) (JCR Top 20% (Q1), Environmental Sciences: 32/250) (Times cited: 65 from Web of Science Core Collection)
  17. Ahmad, M., Ok, Y.S.*, Rajapaksha, A.U., Lim, J.E., Kim, B.Y., Ahn, J.H., Lee, Y.H., Al-Wabel, M.I., Lee, S.E. and Lee, S.S. (2016). Lead and copper immobilization in a shooting range soil using soybean stover- and pine needle-derived biochars: Chemical, microbial and spectroscopic assessments. Journal of Hazardous Materials, 301:179-186 (Impact Factor: 7.650) (JCR Top 1% (Q1), Environmental Science: 12/250) (Times cited: 60 from Web of Science Core Collection)
  18. Hussain, M., Farooq, M., Nawaz, A., Al-Sadi, A.M., Solaiman, Z.M., Alghamdi, S.S., Ammara, U., Ok, Y.S. and Siddique, K.H.M. (2017) Biochar for crop production: Potential benefits and risks. Journal of Soils and Sediments, 17:685-716 (IF 2.627) (JCR (Q2), Soil Science: 11/34) (Times cited: 57 from Web of Science Core Collection)
  19. Ali, S., Rizwan, M., Qayyum, M.F., Ok, Y.S., Ibrahim, M., Riaz, M., Arif, M.S., Hafeez, F., Al-Wabel, M.I. and Shahzad, A.N. (2017). Biochar soil amendment on alleviation of drought and salt stress in plants: a critical review. Environmental Science and Pollution Research, 24(14):12700-12712 (IF 2.914) (JCR (Q2), Environmental Sciences: 91/250) (Times cited: 55 from Web of Science Core Collection)
  20. Igalavithana, A.D., Lee, S.E., Lee, Y.H., Tsang, D.C., Rinklebe, J., Kwon, E.E. and Ok, Y.S.* (2017). Heavy metal immobilization and microbial community abundance by vegetable waste and pine cone biochar of agricultural soils. Chemosphere, 174:593-603 (Impact Factor: 5.108) (JCR Top 20% (Q1), Environmental Sciences: 32/250) (*Corresponding Author) (Times cited: 54 from Web of Science Core Collection)
  21. Beiyuan, J., Awad, Y.M., Beckers, F., Tsang, D.C.W., Ok, Y.S. and Rinklebe, J. (2017) Mobility and phytoavailability of As and Pb in a contaminated soil using pine sawdust biochar under systematic change of redox conditions. Chemosphere, 178:110-118. (Impact Factor: 5.108) (JCR Top 20% (Q1), Environmental Sciences: 32/250) (Times cited: 51 from Web of Science Core Collection)
  22. Ahmad M., Lee, S.S., Lee, S.E., Al-Wabel, M.I., Tsang, D.C.W. and 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 (IF 2.627) (JCR (Q2), Soil Science: 11/34) (*Corresponding Author) (Times cited: 50 from Web of Science Core Collection)
  23. Lee, J., Yang, X., Cho, S.H., Kim, J.K., Lee, S.S., Tsang, D.C.W., Ok, Y.S.* and Kwon, E.E. (2017). Pyrolysis process of agricultural waste using CO2 for waste management, energy recovery, and biochar fabrication. Applied Energy, 185:214-222 (IF 8.426) (JCR Top 5% (Q1), Engineering, Chemical: 5/138) (*Corresponding Author) (Times cited: 49 from Web of Science Core Collection)
  24. Niazi, N.K., Bibi, I., Shahid, M., Ok, Y.S., Burton, E.D., Wang, H.I., Shaheen, S.M., Rinklebe, J., Luttge, A. (2018). Arsenic Removal By Perilla Leaf Biochar In Aqueous Solutions And Groundwater: An Integrated Spectroscopic And Microscopic Examination. Environmental Pollution 232: 31-41. (Impact Factor: 5.714) (JCR Top 10% (Q1), Environmental Sciences: 25/250) (Times cited: 49 from Web of Science Core Collection)
  25. Chen, S.S., Maneerung, T., Tsang, D.C.W., Ok, Y.S and Wang, C.H. (2017). Valorization of biomass to hydroxymethylfurfural, levulinic acid, and fatty acid methyl ester by heterogeneous catalysts. Chemical Engineering Journal, 328:246-273 (IF 8.355) (JCR Top 5% (Q1), Engineering, Chemical: 6/138) (Times cited: 45 from Web of Science Core Collection)
  26. Fang, J., Zhan, L., Ok, Y.S. and Gao, B. (2017). Minireview of potential applications of hydrochar derived from hydrothermal carbonization of biomass. Journal of Industrial and Engineering Chemistry, 57: 15-21 (IF 4.978) (JCR Top 10% (Q1), Engineering, Chemical: 15/138) (Times cited: 44 from Web of Science Core Collection)
  27. Sarkar, B., Mandal, S., Tsang, Y.F., Kumar, P., Kim, K.H. and Ok, Y.S.* (2018). Designer carbon nanotubes for contaminant removal in water and wastewater: A critical review. Science of the Total Environment, 612:561-581 (Impact Factor: 5.589) (JCR Top 15% (Q1), Environmental Sciences: 27/250) (Times cited: 37 from Web of Science Core Collection)
  28. Vikrant, K., Kim, K.H., Ok, Y.S.*, Tsang, D.C.W., Tsang, Y.F., Giri, B.S. and Singh, R.S. (2017). Engineered/designer biochar for the removal of phosphate in water and wastewater. Science of The Total Environment (Impact Factor: 5.589) (JCR Top 15% (Q1), Environmental Sciences: 27/250) (*Corresponding Author) (Times cited: 27 from Web of Science Core Collection)
  29. El-Naggar, Ali, Shaheen, S.M., Ok, Y.S.* and Rinklebe, J. (2018) Biochar affects the dissolved and colloidal concentrations of Cd, Cu, Ni, and Zn and their phytoavailability and potential mobility in a mining soil under dynamic redox-conditions. Science of The Total Environment, 624, 1059-1071 (IF 4.610) (JCR Top 15% (Q1), Environmental Sciences: 27/242) (* Corresponding author) (Times cited: 32 from Web of Science Core Collection)
  30. Niazi, N.K., Bibi, I., Fatimah, A., Shahid, M., Javed, M.T., Wang, H., Ok, Y.S., Bashir, S., Murtaza, B., Saqib, Z.A. and Shakoor, M.B. (2017) Phosphate-assisted phytoremediation of arsenic by Brassica napus and Brassica juncea: Morphological and physiological response. International Journal of Phytoremediation 19(7):670-678 (IF 1.770) (JCR (Q2), Environmental Sciences: 121/229) (Times cited: 28 from Web of Science Core Collection)
  31. Niazi, N.K., Bibi, I., Shahid, M., Ok, Y.S., Shaheen, S.M., Rinklebe, J., Wang, H., Murtaza, B., Islam, E., Nawaz, M.F. and Lüttge, A. (2017). Arsenic removal by Japanese oak wood biochar in aqueous solutions and well water: Investigating arsenic fate using integrated spectroscopic and microscopic techniques. Science of the Total Environment (Impact Factor: 5.589) (JCR Top 15% (Q1), Environmental Sciences: 27/250) (Times cited: 26 from Web of Science Core Collection)
  32. Rizwan, Muhammad; Ali, Shafaqat; Rehman, Muhammad Zia ur; Rinklebe, Joerg; Tsang, Daniel C. W.; Bashir, Arooj; Maqbool, Arosha; Tack, F. M. G.; Ok, Yong Sik. (2018). Cadmium phytoremediation potential of Brassica crop species: A review. 631-632: 1175-1191. Science of The Total Environment (Impact Factor: 5.589) (JCR Top 15% (Q1), Environmental Sciences: 27/250) (Times cited: 25 from Web of Science Core Collection)
  33. El-Naggar, A., Leed, S.S., Awad, Y.M., Yang, X., Ryu, C., Rizwang, M., Rinklebeh, J., Tsangj, D.C.W., Ok, Y.S.* (2018). Influence of soil properties and feedstocks on biochar potential for carbon mineralization and improvement of infertile soils. Geoderma, 332: 100-108. (Impact Factor: 4.336) (JCR Top 15% (Q1), Soil Science: 4/35) (* Corresponding author). (Times cited: 23 from Web of Science Core Collection)
  34. Rajapaksha, A. U., Alam, M.S., Chen N., Alessi D. S., Igalavithana, A.D., Tsang, D.C.W., Ok, Y.S.* (2018). Removal of hexavalent chromium in aqueous solutions using biochar: Chemical and spectroscopic investigations. Science of the Total Environment, 612:103-110 (Impact Factor: 5.589) (JCR Top 15% (Q1), Environmental Sciences: 27/250) (* Corresponding author) (Times cited: 21 from Web of Science Core Collection)
  35. Shen, Z., Hou, D., Zhao, B., Xu, W., Ok, Y.S., Bolan, N.S. and Alessi, D.S. (2018). Stability of heavy metals in soil washing residue with and without biochar addition under accelerated ageing. Science of The Total Environment, 619-620: 410-418 (Impact Factor: 5.589) (JCR Top 15% (Q1), Environmental Sciences: 27/250) (Times cited: 19 from Web of Science Core Collection)
  36. El-Naggar, A’, Lee, S.S., Rinklebe, J., Farooq, M., Song, H., Sarmah, A.K., Zimmerman, A.R., Ahmad, M., Shaheen, S.M. and Ok, Y.S.* (2019) Biochar application to low fertility soils: A review of current status, and future prospects. Geoderma, 337: 536-554. (Impact Factor: 4.336) (JCR Top 15% (Q1), Soil Science: 4/35) (* Corresponding author). (Times cited: 16 from Web of Science Core Collection)
  37. Poucke, R.V., Ainsworth, J., Maeseele, M., Ok, Y.S., Meers, E. and Tack, F.M.G. (2017) Chemical stabilization of Cd-contaminated soil using biochar. Applied Geochemistry, 88: 122-130 (IF 2.581) (JCR (Q2), Geochemistry & Geophysics: 29/84) (Times cited: 15 from Web of Science Core Collection)
  38. Alam, M.S., Swaren, L., von Gunten, K., Cossio, M., Bishop, B., Robbins, L.J., Hou, D., Flynn, S.L., Ok, Y.S., Konhauser, K.O. and Alessi, D.S. (2017). Application of surface complexation modeling to trace metals uptake by biochar-amended agricultural soils. Applied Geochemistry (IF 2.581) (JCR (Q2), Geochemistry & Geophysics: 29/84) (Times cited: 13 from Web of Science Core Collection).

Hot papers (Data from Essential Science Indicators. These hot papers were published in the last year and received enough citations in June 2019 to place it in the top 0.1% of papers in the field of Environment/Ecology, agricultural science and geoscience)

  1. Yang, Y., Ok, Y.S., Kim, K.H., Kwon, E.E., Tsang, Y.F. (2017). Occurrences and removal of pharmaceuticals and personal care products (PPCPs) in drinking water and water/sewage treatment plants: A Review. Science of the Total Environment, 596: 303-320. (IF 4.610) (JCR Top 15% (Q1), Environmental Sciences: 27/242) (Times cited: 162 from Web of Science Core Collection)
  2. Antoniadis, V., Levizou, E., Shaheen, S.M., Ok, Y.S., Sebastian, A., Baum, C., Prasad, M.N.V., Wenzel, W.W., Rinklebe, J. (2017). Trace Elements in the soil-plant interface: Phytoavailability, translocation, and phytoremediation-A Review. Earth Science Reviews 171: 621-645. (IF 7.339). (JCR Top 25% (Q1) (Times cited: 96 from Web of Science Core Collection)
  3. El-Naggar, A., Leed, S.S., Awad, Y.M., Yang, X., Ryu, C., Rizwang, M., Rinklebeh, J., Tsangj, D.C.W., Ok, Y.S.* (2018). Influence of soil properties and feedstocks on biochar potential for carbon mineralization and improvement of infertile soils. Geoderma, 332: 100-108. (Impact Factor: 4.336) (JCR Top 15% (Q1), Soil Science: 4/35) (*Corresponding author) (Times cited: 23 from Web of Science Core Collection)