Fe3+ and amino functioned mesoporous silica: preparation, structural analysis and arsenic adsorption.
Two novel adsorbents to remove excess arsenate and arsenite in the drinking water were prepared for the first time by grafting monoamine and diamine, respectively, and then coordinating Fe(3+) on silica gel that was obtained using sol-gel method with two-step acid-base catalysis. It was found that both adsorbents had mesoporous structure, large specific surface, and high amino and iron content according to N(2) adsorption isotherms, FTIR, XPS, and NMR analysis. The removal ability and adsorption rate of the adsorbents were very high for both As(V) and As(III). Langmuir and Freundlich models were used to fit the adsorption isotherm and investigate the adsorption mechanism. The effects of chloride and sulfate anion on the removal of arsenate and arsenite for the two adsorbents were also studied.
State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Science, Beijing 100190, PR China.
Jun-Chao
JC
Zuo
Sheng-Rui
SR
Tong
Xiao-Lin
XL
Yu
Ling-Yan
LY
Wu
Chang-Yan
CY
Cao
Mao-Fa
MF
Ge
Wei-Guo
WG
Song
D000327:Adsorption; D001149:Arsenates / Q000737:chemistry*; D018053:Arsenites / Q000737:chemistry*; D005782:Gels; D007501:Iron / Q000737:chemistry*; D011437:Propylamines; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D012826:Silicone Elastomers / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
D001149:Arsenates; D018053:Arsenites; D005782:Gels; D011437:Propylamines; D012821:Silanes; D012826:Silicone Elastomers; D014874:Water Pollutants, Chemical; C006194:aminoethyl-aminopropyl-trimethoxysilane; D012822:Silicon Dioxide; D007501:Iron; C477625:amino-propyl-triethoxysilane; C015001:arsenite; C025657:arsenic acid