Remediation and resource utilization of Cr(Ⅲ), Al(Ⅲ) and Zr(Ⅳ)-containing tannery effluent based on chitosan-carboxymethyl cellulose aerogel

IF 20.2 Q1 MATERIALS SCIENCE, PAPER & WOOD

Journal of Bioresources and Bioproducts Pub Date : 2025-02-01 DOI:10.1016/j.jobab.2024.11.003

Shuang Liang , Xuechuan Wang , Chao Wei , Long Xie , Zhongming Song , Xugang Dang

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引用次数: 0

Abstract

Composite aerogel based on sodium carboxymethyl cellulose (CMCNa) and chitosan (CS), i.e., CS/CMCNa, was prepared through a sol-gel method. Then, CS/CMCNa was used for simulating the adsorption of metal ions (Cr³⁺, Al³⁺ and Zr⁴⁺) produced by the tanning industry. The adsorption process is consistent with the Langmuir isotherm adsorption model and pseudo-second order kinetics. The maximum fitted adsorption capacities of Cr³⁺, Al³⁺, and Zr⁴⁺ could reach 250.0, 111.1, and 100.0 mg/g, respectively. After metal ion adsorption, the obtained composite materials (CS/CMCNa-Cr³⁺, CS/CMCNa-Al³⁺, and CS/CMCNa-Zr⁴⁺) were used as re-tanning agents in the re-tanning process to leather. The re-tanning agent could increase the shrinkage temperature of leather by up to 5 °C. Compared with the traditional method, the method utilized in this study achieved the integration of mental ions-containing wastewater treatment and waste adsorbent/adsorbates recycling.

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壳聚糖-羧甲基纤维素气凝胶对含Cr（Ⅲ）、Al（Ⅲ）和Zr（Ⅳ）制革废水的修复及资源化利用

采用溶胶-凝胶法制备了羧甲基纤维素钠（CMCNa）和壳聚糖（CS）复合气凝胶，即CS/CMCNa。然后，利用CS/CMCNa模拟吸附制革工业产生的金属离子（Cr3+、Al3+和Zr4+）。吸附过程符合Langmuir等温吸附模型和准二级吸附动力学。对Cr3+、Al3+和Zr4+的最大吸附量分别可达250.0、111.1和100.0 mg/g。经金属离子吸附后，得到的复合材料（CS/CMCNa-Cr3+、CS/CMCNa-Al3+、CS/CMCNa-Zr4+）作为复鞣剂用于皮革复鞣。复鞣剂可使皮革的收缩温度提高5℃。与传统方法相比，本研究采用的方法实现了含金属离子废水处理与废吸附剂/吸附剂回收的一体化。

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