Bentonite polymer composite for water purification

被引：18

作者：

Seilkhanova, Gulziya A. ^{[1
]}

Imangaliyeva, Ainur N. ^{[1
]}

Mastai, Yitzhak ^{[2
,3
]}

Rakhym, Akmaral B. ^{[1
]}

机构：

[1] Al Farabi Kazakh Natl Univ, Fac Chem & Chem Technol, Alma Ata 050040, Kazakhstan

[2] Bar Ilan Univ, Dept Chem, IL-5290002 Ramat Gan, Israel

[3] Bar Ilan Univ, Inst Nanotechnol, IL-5290002 Ramat Gan, Israel

来源：

BULLETIN OF MATERIALS SCIENCE | 2019年 / 42卷 / 02期

关键词：

Bentonite clay; polyethylene glycol; lead; cadmium; sorption; composite materials; HEAVY-METAL REMOVAL; AQUEOUS-SOLUTIONS; ACTIVATED CARBON; ADSORPTION; ACID; SORPTION; MECHANISM; PB(II); IONS; CLINOPTILOLITE;

D O I：

10.1007/s12034-019-1752-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A polyethylene glycol (PEG)-bentonite (BT) composite was prepared by direct polymerization of PEG in suspensions of BT. Based on detailed analyses using field-effect scanning electron microscopy, X-ray diffraction, surface area measurements and chemical methods, the obtained product was mainly composed of Ca-BT with a specific surface area of 4.13m2g-1. The optimal conditions for adsorption of Pb2+ and Cd2+ ions were found to be a PEG content of 0.1% and a contact time of 60 min. The sorption experiments were performed under various operating variables, including polymer concentration, pH and temperature. For both Pb2+ and Cd2+, the adsorption equilibrium was described by the Freundlich model, which confirmed the presence of a heterogeneous system with irregular filling of the active centres. The maximum sorption capacities of BT-PEG for removal of Pb2+ and Cd2+ were found to be 22 and 18 mg g-1, respectively. The rate constants calculated for the sorption of Pb2+ and Cd2+ were 6.29 and 6.67 g mg-1min-1, respectively, at 25 degrees C. This study shows that the obtained sorbents based on BT may be used for treatment of waste water and could help resolve environmental protection issues.

引用

页数：8

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