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Yasir Hamid, Speaker at Green Chemistry Conferences
Yasir Hamid
Zhejiang University, China
Title : Novel thiol-grafted composite of chitosan and rice straw biochar (TH@CT-BC): A two-step fabrication for highly selective adsorption of cadmium from contaminated water

Abstract:

This study followed the one-step and two-step technologies to produce rice straw biochar (BC), chitosan-modified rice straw biochar (CT-BC), and thiol grafted chitosan-modified biochar (TH@CT-BC) for cadmium (Cd) removal from contaminated water. Here, chitosan and thiol were introduced by two-step combination to enhance the adsorption ability of biochar. Our results revealed the maximum Cd adsorption at pH 5.5 with TH@CT-BC (261.47 mg g-1) followed by CT-BC (103.14 mg g-1) and BC (29.64 mg g-1). Obtained data was best fitted by the Langmuir and pseudo-second-order kinetic models (with R2 values of 0.997 for TH@CT-BC) as compared to Freundlich and Temkin models (0.949 and 0.925, respectively). TH@CT-BC retained its efficiency in spiked river water system, removing up to 89% of Cd in river water spiked with 30 mg-1 L Cd. The experimental investigations and data calculations demonstrated the surface complexation and electrostatic interaction as dominant underlying mechanisms for Cd removal by TH@CT-BC. Moreover, it is essential to utilize the large amount of produced rice straw to develop new materials which would help in converting the waste to useable product for environmental remediation. Thus, this study demonstrates the production of TH@CT-BC from rice straw as an effective adsorbent of Cd from aqueous systems which can be studied as a potential candidate for practical wastewater treatment applications.

Biography:

Dr. Yasir Hamid is a young scientist and an International Exchange Postdoctoral Fellow at Zejiang University, Hangzhou, China. Dr. Hamid earned MSc degree from Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Pakistan. Recently, Dr. Hamid received his PhD degree in Plant Nutrition from College of Environmental and Resource Sciences, Zhejiang University in March 2020. Dr. Hamid’s research focuses on agro-environmental contamination by potentially toxic elements such as cadmium, lead, arsenic, copper and chromium. His work expertise includes plant nutrition, soil chemistry and environmental sciences with specific focus on abatement of heavy metal risks and their remediation technologies. Dr. Hamid has authored around 65 peer reviewed papers in reputable international journals, among which 14 as a first author and 51 as co-author, having h-index of 30. He has also delivered oral and poster presentations in international conferences held in Barcelona, Spain and Changsha, China. Dr. Hamid is a regular reviewer of several international journals of various publishing groups. He has worked as research associate in a funded project by Higher Education Commission of Pakistan in year 2016. Later, he was awarded Two High Doctoral Scholarship by Zhejiang University to continue his doctoral degree in year 2016. Dr. Hamid is currently collaborating with reputable scientists of environmental science field from Oman, United States, Germany, and Canada for various writing projects.

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