Preparation and Adsorption Property for Cr(Ⅵ[) of Granular CTMAB/Attapulgite
CHENG Lang
LIU Hong
WANG Qian
ZHANG Huiling
FAN Xianyuan
Abstract：Powder attapulgite as a raw material was used to make the granular attapulgite,then granular attapulgite was modified with the surfactant of cetyltrimethylammonium bromide(CTMAB) by microwave modification to obtain the granular CTMAB/attopulgite,and it was found that the optimal conditions for preparing method were that the calcination temperature 550 ℃,the surfactant concentration 80 mmol/L,the time of microwave 6 min.The effects of initial concentration and pH of Cr(Ⅵ) solution were investigated,and it was showed that when the concentration of Cr(Ⅵ) was 20 mg/L,pH was 5.6 and the dosage was 4 g/L,the removal efficiency of Cr(Ⅵ) by granular CTMAB/attapulgite was 90.7％.The results showed that CTMAB had either entered the interlayer or sorbed on the external surface of the granular attapulgite,making the Zeta potential of granular attapulgite become positve from negtive to have better adsorption properties for dichromate.The Zeta potential of granular CTMAB/attapulgite decreased with the increase of pH,consistent with the removal of Cr(Ⅵ) with pH.The adsorption process was found to fit Langmuir isotherm model and pseudo second-order rate equations,indicating that the adsorption model was a faster and monomolecular layer adsorption.
Keywords：granular CTMAB/attapulgiteCr(Ⅵ)adsorptionmodified
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 77-81 )