Lead Adsorption on Rice Husk as a Function of pH Control
The use of agro-based waste materials in treatment zones for removal of heavy metals from the aqueous phase by adsorption represents a lowcost and possibly effective remediation alternative.In this study,the adsorption of lead(Pb2+)on a rice-husk residue was tested in different experiments with initial 100 mg Pb2+/L,initial pH values of 3,5,or 7,and solid:liquid ratio(mass basis)of 1:20.In some experiments pH was allowed to vary,whereas in other experiments pH was kept approximately fixed.For the experiments with variable pH,Pb2+was most adsorbed(93%)in the test where pH increased from 3 to 5.1,and least adsorbed in the test where pH decreased from 7 to 6.4.The point of zero charge of the rice husk was determined to be pH 4.5.For the experiments with fixed pH,the optimum pH for Pb2+adsorption(95%)was found to be pH 5,and the test at pH 3 removed 67%of the initial Pb2+.The results allowed to grasp the significant effect pH control plays on Pb2+adsorption,and the relevance of studying the factors that control pH during Pb2+adsorption in a field application(in-situ treatment zone).
Adsorption Agro-based residues Lead Permeable reactive barriers Rice husk
Paulo Scarano Hemsi Diego Diez Garcia
Aeronautics Institute of Technology,P(c)a.Mal.Eduardo Gomes,50,Sao Jose dos Campos 12.228-900,Brazil
国际会议
The 8th International Congress on Environmental Geotechnics(第八届国际环境土工大会)
杭州
英文
630-636
2018-10-28（万方平台首次上网日期，不代表论文的发表时间）