title: Efficient removal of heavy metal ions from aqueous solution using salicylic acid type chelate adsorbent.
abstract: In this study, 5-aminosalicylic acid was successfully grafted onto the poly(glycidyl methacrylate) (PGMA) macromolecular chains of PGMA/SiO(2) to obtain a novel adsorbent designated as ASA-PGMA/SiO(2). The adsorption properties of ASA-PGMA/SiO(2) for heavy metal ions were studied through batch and column methods. The experimental results showed that ASA-PGMA/SiO(2) possesses strong chelating adsorption ability for heavy metal ions, and its adsorption capacity for Cu(2+), Cd(2+), Zn(2+), and Pb(2+) reaches 0.42, 0.40, 0.35, and 0.31 mmol g(-1), respectively. In addition, pH has a great influence on the adsorption capacity in the studied pH range. The adsorption isotherm data greatly obey the Langmuir and Freundlich model. The desorption of metal ions from ASA-PGMA/SiO(2) is effective using 0.1 mol l(-1) of hydrochloric acid solution as eluent. Consecutive adsorption-desorption experiments showed that ASA-PGMA/SiO(2) could be reused almost without any loss in the adsorption capacity.
authors: Chemical Department, North University of China, Road 3, Taiyuan 030051, PR China. qqfengxiaoqin@126.com
authors: Fuqiang
authors: F
authors: An
authors: Baojiao
authors: B
authors: Gao
authors: Xin
authors: X
authors: Dai
authors: Min
authors: M
authors: Wang
authors: Xiaohua
authors: X
authors: Wang
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000737:chemistry; D002614:Chelating Agents / Q000494:pharmacology*; D002621:Chemistry / Q000379:methods*; D003300:Copper / Q000737:chemistry; D006851:Hydrochloric Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry*; D007700:Kinetics; D007854:Lead / Q000737:chemistry; D019216:Metals, Heavy / Q000032:analysis*; D008956:Models, Chemical; D020156:Salicylic Acid / Q000032:analysis*; D013997:Time Factors; D014867:Water / Q000737:chemistry; D015032:Zinc / Q000737:chemistry
chemical_list: D002614:Chelating Agents; D007477:Ions; D019216:Metals, Heavy; D002104:Cadmium; D014867:Water; D007854:Lead; D003300:Copper; D015032:Zinc; D020156:Salicylic Acid; D006851:Hydrochloric Acid