Heavy metal adsorption by sulphide mineral surfaces |
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| Affiliation: | 1. Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400044, China;2. State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China;1. Department of Chemical Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;2. Department of Mechanical Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;3. Gas Processing Center, Qatar University, P.O. Box 2713, Doha, Qatar;4. Chemical Engineering Department, Qatar University, P.O. Box 2713, Doha, Qatar;5. Qatar Environment and Energy Research Institute (QEERI), Qatar Foundation, P.O. Box 5825, Doha, Qatar;6. College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, P.O. Box 5825, Doha, Qatar;1. Department of Materials Engineering, Faculty of Engineering, Rajamangala University of Technology Rattanakosin, 96 Mu 3 Thanon Phutthamonthon Sai 5, Salaya, Phutthamonthon, Nakhon Pathom, 73170, Thailand;2. The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok, 10330, Thailand;1. Department of Mechanical Engineering, A.N.A College of engineering and technology, Bareilly, India;1. Guangdong Provincial Key Laboratory of Nano-Micro Materials Research, School of Chemical Biology & Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China;2. School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China;3. Guangdong Neilingding Futian National Nature Reserve, Shenzhen 518000, China |
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| Abstract: | ![]()
The adsorption of aqueous Hg2+, Pb2+, Zn2+ and Cd2+ complexes on a variety of sulphide minerals has been studied as a function of the solution pH and also as a function of the nature of the ligands in solution. Sulphide minerals are excellent scavengers for these heavy metals. The adsorption is strongly pH dependent, i.e. there is a critical pH at which the adsorption increases dramatically. The pH dependence is related to the hydrolysis of the metal ions. Indirect evidence suggests that the hydrolyzed species are adsorbed directly on the sulphide groups, probably as a monolayer. The results also suggest the presence of MCIn2−n species physisorbed on the adsorbed monolayer. A positive identification of the adsorbed species was not possible using ESCA/XPS. |
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