Effect of Silica Content in a Bio-Polymeric Blended Nanocomposite for Efficient Adsorption of Mercury in Basic Aqueous Solution

IF 2.3 4区工程技术 Q1 MATERIALS SCIENCE, TEXTILES Fibers and Polymers Pub Date : 2025-01-30 DOI:10.1007/s12221-025-00854-y

A. Tshikovhi, Shivani B. Mishra, Ajay K. Mishra, Tshwafo E. Motaung

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Abstract

The current work describes the development of silica chitosan-guar gum blended nanocomposites (NCs) for the proficient removal of mercury (Hg²⁺) ions in aqueous solution at pH 12. The silica NCs were prepared by dispersing the as-synthesized silica nanoparticles (NPs) into the chitosan-guar gum (CS-GG) polymer blend matrix. The developed silica NCs were characterized by FTIR, SEM–EDS, XRD, TGA, and BET. The results confirmed the dispersion of silica NPs on the surface of the CS: GG blend resulting in silica NCs with improved thermal stability, and an enhanced specific pore surface area from 11.843 m²/g to 23.029 m²/g. The 2 and 5% silica NCs were used as an efficient adsorbent for the removal of mercury ions. The 2 and 5% of silica NCs showed a maximum removal efficiency of 88% and 79% for mercury ions, respectively. The adsorption process is best fitted with the Langmuir adsorption isotherm and pseudo-second-order kinetic model. The adsorbent proved to be economical with 72% of removal efficiency after five cycles using EDTA as a desorbing solution.

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生物聚合物共混纳米复合材料中二氧化硅含量对碱性水溶液中汞高效吸附的影响

目前的工作描述了二氧化硅壳聚糖-瓜尔胶混合纳米复合材料（NCs）的开发，用于在pH为12的水溶液中高效去除汞（Hg2+）离子。将合成的二氧化硅纳米颗粒（NPs）分散到壳聚糖-瓜尔胶（CS-GG）聚合物共混基体中制备二氧化硅纳米颗粒。采用FTIR、SEM-EDS、XRD、TGA和BET等手段对所制备的二氧化硅纳米碳进行了表征。结果证实了二氧化硅NPs在CS: GG共混物表面的分散，使二氧化硅NPs的热稳定性得到改善，比孔表面积从11.843 m2/g增加到23.029 m2/g。采用2%和5%二氧化硅纳米碳管作为高效的汞离子吸附剂。2%和5%的二氧化硅NCs对汞离子的去除率分别为88%和79%。吸附过程最符合Langmuir吸附等温线和拟二级动力学模型。以EDTA为解吸溶液，经5次循环后，该吸附剂的去除率达到72%，具有较好的经济性。

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来源期刊

Fibers and Polymers 工程技术-材料科学：纺织

CiteScore

3.90

自引率

8.00%

发文量

267

审稿时长

3.9 months

期刊介绍： -Chemistry of Fiber Materials, Polymer Reactions and Synthesis- Physical Properties of Fibers, Polymer Blends and Composites- Fiber Spinning and Textile Processing, Polymer Physics, Morphology- Colorants and Dyeing, Polymer Analysis and Characterization- Chemical Aftertreatment of Textiles, Polymer Processing and Rheology- Textile and Apparel Science, Functional Polymers