Development of novel chitosan-lignin composites for adsorption of dyes and metal ions from wastewater
Development of novel chitosan-lignin composites for adsorption of dyes and metal ions from wastewater
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DOI：
10.1016/j.cej.2014.05.045
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发表时间：
2014-10-15
影响因子：
15.1
通讯作者：
Vinu, R.
中科院分区：
文献类型：
--
作者：
Nair, Vaishakh;Panigrahy, Ajitesh;Vinu, R.
重要的是设计新的策略来从木质素中获得价值，木质素是造纸工业和当今生物精炼厂的潜在废物副产品。在这项研究中，我们报告，第一次，一个简单的制备和表征的一系列壳聚糖-碱木质素复合材料，用于去除废水中存在的有害废水。壳聚糖的β-1，4-糖苷键、酰胺基和羟基与碱木质素的醚基和羟基之间存在弱键合。对复合材料中壳聚糖含量、初始pH值、吸附剂用量等反应参数进行了优化。批吸附研究表明，壳聚糖-碱木质素（50：50）复合材料表现出最大的百分比去除蒽醌染料，雷马唑亮蓝R（RBBR），和Cr（VI）相比，其他复合材料，壳聚糖和碱木质素。复合材料对RBBR的吸附符合Langmuir吸附等温式，对RBBR和Cr（VI）的吸附均符合准二级动力学。吸附机理涉及（i）质子化的氨基和羟基分别与染料和Cr（VI）的阴离子SO 3-和HCrO 4-基团的静电相互作用，以及（ii）复合物的氨基和羟基与染料的羰基之间的化学相互作用。(C)2014爱思唯尔有限公司版权所有。
It is important to devise new strategies to derive value from lignin, which is a potential waste by-product from paper industries and present day biorefineries. In this research, we report, for the first time, a facile preparation and characterization of a range of chitosan-alkali lignin composites for the removal of harmful effluents present in wastewater. The composites were characterized by the presence of weak bonding between beta-1,4-glycosidic linkage, amide and hydroxyl groups of chitosan, and ether and hydroxyl groups of alkali lignin. Various reaction parameters like chitosan content in the composite, initial pH and adsorbent dosage were optimized. Batch adsorption studies showed that chitosan-alkali lignin (50:50) composite exhibited maximum percentage removal of anthraquinonic dye, Remazol Brilliant Blue R (RBBR), and Cr(VI) compared to other composites, chitosan and alkali lignin. Adsorption of RBBR on the composite followed Langmuir isotherm, and the adsorption of both RBBR and Cr(VI) followed pseudo second order kinetics. A mechanism of adsorption that involves (i) electrostatic interaction of protonated amino and hydroxyl groups of the composite with anionic SO3- and HCrO4- groups of dye and Cr(VI), respectively, and (ii) chemical interaction between amino and hydroxyl groups of the composite, and carbonyl moiety of the dye, was proposed. (C) 2014 Elsevier B.V. All rights reserved.