title: Sorption and ecotoxicity of pentachlorophenol polluted sediment amended with rice-straw derived biochar.
abstract: To investigate the feasibility of using biochar to control organic pollutants in sediments, we extracted biochar from rice-straw combustion residues (RBC) and studied its adsorption ability and effect on seed germination ecotoxicity of pentachlorophenol (PCP). The results showed that the Freundlich and dual-mode models could describe all the sorption isotherm data well, and the log K(OC) values increased with increasing RBC content. With 50 mg kg(-1) PCP in the sediment, a significant seed growth inhibition (P<0.01) was observed. The addition of 2.0% RBC lowered the PCP concentration in the extraction liquid from 4.53 to 0.17 mg L(-1) and increased the germination rate and root length significantly. Furthermore, it was found that the addition of RBC had no toxic but stimulative effect on root elongation. Consequently, RBC could serve as a potential supersorbent for the remediation of organic pollution in situ.
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, People's Republic of China. loulp@zju.edu.cn
authors.forename: Liping
authors.initials: L
authors.lastname: Lou
authors.forename: Binbin
authors.initials: B
authors.lastname: Wu
authors.forename: Lina
authors.initials: L
authors.lastname: Wang
authors.forename: Ling
authors.initials: L
authors.lastname: Luo
authors.forename: Xinhua
authors.initials: X
authors.lastname: Xu
authors.forename: Jiaai
authors.initials: J
authors.lastname: Hou
authors.forename: Bei
authors.initials: B
authors.lastname: Xun
authors.forename: Baolan
authors.initials: B
authors.lastname: Hu
authors.forename: Yingxu
authors.initials: Y
authors.lastname: Chen
mesh_terms: D000042:Absorption; D000704:Analysis of Variance; D002606:Charcoal / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D018525:Germination / Q000187:drug effects; D008954:Models, Biological; D012275:Oryza / Q000737:chemistry*; D010416:Pentachlorophenol / Q000032:analysis* / Q000633:toxicity*; D035261:Plant Components, Aerial / Q000737:chemistry*; D012639:Seeds / Q000187:drug effects; D012989:Soil Pollutants / Q000737:chemistry*; D014908:Triticum / Q000187:drug effects / Q000254:growth & development
chemical_list: D012989:Soil Pollutants; C540010:biochar; D002606:Charcoal; D010416:Pentachlorophenol