title: Effects of Peanut Shell Biochar on the Adsorption of Cd(II) by Paddy Soil.
abstract: Soil from an experimental paddy field in southern China was incubated with peanut shell biochar to investigate effects of this additive on the adsorption and desorption characteristics of Cd(II) using batch methods. Incorporation of biochar increased adsorption of Cd(II) by the paddy soil at 20, 25, and 30°C; this trend was apparent both with increasing quantities of biochar and rising temperature. Incorporation of biochar primarily enhanced the non-electrostatic adsorption of Cd(II). In addition, supplementation with biochar decreased the adsorption rate of Cd(II), which decreased with increasing quantities of biochar. The Langmuir constant b and Freundlich constant kfboth increased with greater quantities of biochar at different temperatures. Adsorption of Cd(II) was an endothermic process and occurred spontaneously. Incorporation of biochar decreased availability and mobility of Cd(II) to plants primarily through increased non-electrostatic adsorption of Cd(II) by paddy soil.
authors.affiliation: Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, China. xuchao1388@126.com.|College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China. xuchao1388@126.com.
authors.forename: Chao
authors.initials: C
authors.lastname: Xu
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 10085, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Wen
authors.affiliation: Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, China.
authors.forename: Qihong
authors.initials: Q
authors.lastname: Zhu
authors.affiliation: Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, China.
authors.forename: Hanhua
authors.initials: H
authors.lastname: Zhu
authors.affiliation: College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China.
authors.forename: Yangzhu
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, China.
authors.forename: Daoyou
authors.initials: D
authors.lastname: Huang
mesh_terms: D000327:Adsorption / Q000187:drug effects; D010367:Arachis; D002104:Cadmium / Q000032:analysis*; D002606:Charcoal / Q000494:pharmacology*; D002681:China; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis; D013696:Temperature
chemical_list: D012987:Soil; D012989:Soil Pollutants; C540010:biochar; D002104:Cadmium; D002606:Charcoal
keywords: Biomass; Desorption; Isothermal model; Sorption