In order to improve the adsorption performance of sodium bentonite,hydroxyl-Al pillared bentonite was prepared with hydroxyl aluminium cations.The physical and chemical properties were characterized by using FT-IR,BET&BJH,SEM and Zeta potential.The effects of several processing variables on the adsorption performance were studied in detail.The adsorption mechanism was discussed with respect to a number of kinetic/adsorption isotherm models and thermodynamic analysis.The characterization results indicated that hydroxyl-Al cations intercalated to the layers of bentonite.The layers were separated with larger spacing after modification,and the porosity and roughness of the surface increased.The BET specific surface area increased from 49.56m2/g to 247.52m2/g,and micropore area increased from 11.35m2/g to 181.61m2/g.The pore volume increased and the average pore size decreased.At pH 4,temperature 40℃ with adsorbent dosage of 10g/L,the treatment to 30mg/L of Cr(Ⅵ) reached the highest removal rate of 95.50% after contacting 60min.The adsorption process mainly corresponded to chemical adsorption and ionic exchange.The adsorption process was endothermic and spontaneous,and increasing temperature promoted the adsorption.
Zou Chenglong
,
Nie Fahui
,
Lu Xiuguo
,
Zhang Weifeng
. Adsorption peroperty of hydroxyl-Al pillared bentonite for Cr(Ⅵ) in aqueous solution[J]. New Chemical Materials, 2021
, 49(1)
: 184
-189
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.01.041
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