Influence of anion induced proton abstraction on Cu(II) adsorption by alginic acid

被引：24

作者：

Vaid, Upma ^{[1
]}

Mittal, Sunil ^{[1
]}

Babu, J. Nagendra ^{[1
]}

机构：

[1] Cent Univ Punjab, Ctr Environm Sci & Technol, Sch Environm & Earth Sci, Bathinda 151001, Punjab, India

来源：

REACTIVE & FUNCTIONAL POLYMERS | 2015年 / 97卷

关键词：

Alginic acid; Copper; Adsorption; Counter ion effect; Egg box complex; Metal-carboxylate interactions; HEAVY-METAL REMOVAL; AQUEOUS-SOLUTION; COPPER II; IONS; ADSORBENT; CELLULOSE; CAPACITY; CHROMIUM; PB(II); CHITIN;

D O I：

10.1016/j.reactfunctpolym.2015.10.006

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Alginic acid (AA) synthesized by acidification of commercial sodium alginate was investigated for its Cu(II) adsorption efficiency in the presence of different counter ions. The results of batch adsorption studies indicated an adsorption of 169.86 mg/g of Cu(II) by AA in the presence of acetate ions, however, it significantly decreased in the presence of chloride (126.36 mg/g), sulphate (115.24 mg/g) and nitrate (113.28 mg/g) as counter ions.This can be accounted to the tendency of conjugate base (anion) to abstract proton from AA, which determines the extent of deprotonation of carboxylic add. The FTIR and TGA/DTA studies support the difference in the coordination of carboxylate'to Cu(II) in the presence of various counter anions. Acetate showed strong chelate coordination between Cu(II) and AA, whereas in the presence of Cl-, NO3- and SO42-, Cu(II) was complexed by weak bridging coordination with AA. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：48 / 55

页数：8

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