Remediation of cadmium and lead polluted soil using thiol-modified biochar
| Autor: | Frederic Coulon, Youchi Zhang, Haifeng Chi, Brian J. Reid, Yanwei Hou, Jiajun Fan, Chao Cai |
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| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Environmental remediation Health Toxicology and Mutagenesis Soil remediation 0211 other engineering and technologies Amendment chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences symbols.namesake Adsorption Surface complexation Biochar Environmental Chemistry Soil Pollutants Sulfhydryl Compounds Waste Management and Disposal Environmental Restoration and Remediation 0105 earth and related environmental sciences 021110 strategic defence & security studies Cadmium Langmuir adsorption model Sorption Pollution Rice straw biochar Heavy metal pollution chemistry Lead Charcoal symbols Thiol-modification Nuclear chemistry BET theory |
| Zdroj: | Journal of hazardous materials. 388 |
| ISSN: | 1873-3336 |
| Popis: | Thiol-modified rice straw biochar (RS) was prepared by an esterification reaction with β-mercaptoethanol and used for the remediation of Cd and Pb polluted soils. Modified biochar was characterized through elemental analysis, BET analysis, FE-SEM, FT-IR and XPS. These analytical results revealed that thiol groups were successfully grafted onto the surface of the biochar and were involved in metal ion complexation. Batch sorption experiments indicated that Cd2+ and Pb2+ sorption onto RS described well by a pseudo second order kinetic model and a Langmuir isotherm. The maximum adsorption capacities for Cd2+ and Pb2+, in the single-metal systems, were 45.1 and 61.4 mg g-1, respectively. In the binary-metal systems, RS selectively adsorbed Cd2+ over Pb2+. Cd2+ and Pb2+ were removed mainly through surface complexation. In the soil incubation experiments (28 days), RS reduced the available Cd by 34.8-39.2 %; while, RS reduced the available Pb by 8.6 %-11.1 %. This research demonstrates RS as a potentially effective amendment for the remediation of heavy metal polluted soils. |
| Databáze: | OpenAIRE |
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