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Microwave-assisted synthesis of cross-linked chitosan-metal oxide nanocomposite for methyl orange dye removal from unary and complex effluent matrices
International Journal of Biological Macromolecules ( IF 8.2 ) Pub Date : 2022-08-02 , DOI: 10.1016/j.ijbiomac.2022.07.239
Gautam Priyadarshi 1 , Nirav P Raval 2 , Mrugesh H Trivedi 1
Affiliation  

Textile/Dyeing industries have been considered as one of the intense water-consuming units, resulting in the generation of a large volume of dye(s) contaminated effluent posing a heavy burden on the receiving water bodies. Therefore, the identification of methods to synthesize bulk quantity of adsorbent(s) and further their evaluation for the efficient treatment of effluent is one of the most prominent topics. Hence, microwave-assisted method was proposed for the rapid synthesis of nanocomposite (C-CS@ZnO) from natural biomolecule (chitosan-CS), a well-known crosslinker (tripolyphosphate) and metal-oxide (ZnO) nanoparticles. Detailed characterization was performed to identify the structure (SEM, XRD) and composition (FT-IR, XPS) of the sorbent. Sorption experiments with methyl orange (MO) dye solution were carried out under different pH (2.0–12.0), dye concentrations (150–350 mg L−1), reaction times (0–210 min) and temperature (25–45 °C) to establish the adsorbent at the lab-scale. The maximum sorption capacity (185.2 mg g−1) was obtained because of the ligand-exchange, Yoshida H-bonding and electrostatic interactions and was best elucidated by Freundlich (R2 ≥ 0.99) and pseudo-second-order (R2 ≥ 1) models. To simulate the field conditions, the effects of co-existing ions (anions/cations), cocktail dyes/ions mixture and regenerant were also studied. The obtained results suggest its promising applicability at a large scale for textile effluent treatment.



中文翻译:

微波辅助合成交联壳聚糖-金属氧化物纳米复合材料用于去除一元和复杂废水基质中的甲基橙染料

纺织/印染行业一直被认为是耗水量大的单位之一,导致产生大量染料污染废水,对受纳水体造成沉重负担。因此,确定合成大量吸附剂的方法并进一步评估它们对废水的有效处理是最突出的主题之一。因此,微波辅助方法被提出用于从天然生物分子(壳聚糖-CS)、众所周知的交联剂(三聚磷酸盐)和金属氧化物(ZnO)纳米粒子快速合成纳米复合材料(C-CS@ZnO)。进行详细表征以确定吸附剂的结构(SEM、XRD)和组成(FT-IR、XPS)。在不同的 pH 值(2.0-12.0)下进行甲基橙(MO)染料溶液的吸附实验,-1 )、反应时间 (0–210 min) 和温度 (25–45 °C) 以在实验室规模建立吸附剂。由于配体交换、吉田 H 键和静电相互作用,获得了最大吸附容量 (185.2 mg g -1 ),并且最好用 Freundlich (R 2  ≥ 0.99) 和准二级 (R 2  ≥ 1 ) 阐明) 楷模。为了模拟现场条件,还研究了共存离子(阴离子/阳离子)、鸡尾酒染料/离子混合物和再生剂的影响。所得结果表明其在大规模纺织废水处理中的应用前景广阔。

更新日期:2022-08-06
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