基于壳聚糖的纳米复合材料用于去除废水中的六价铬和合成食用色素。
Chitosan-based nanocomposites for removal of Cr(VI) and synthetic food colorants from wastewater.
机构信息
Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung, Taiwan.
Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Marine Biotechnology and Resources, National Sun Yat-Sen University, Kaohsiung, Taiwan; Research Center for Environmental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
出版信息
Bioresour Technol. 2022 May;351:127018. doi: 10.1016/j.biortech.2022.127018. Epub 2022 Mar 17.
Current study aims to synthesize chitosan/polyvinyl alcohol (CS/PVA), poly(ethyleneimine), and FeO impregnated beads for co-removal of Cr(VI) and toxic azo-dyes from wastewater. The mesoporous PEI@AC@FeO exhibits magnetism and enhanced physisorption by higher specific-porosity (2.1 nm) from Cr(VI) radii (0.044 nm). Moreover, surface functional groups (-OH, -NH, -NH, -COOH etc.), especially amines enhance ionic bonding due to positive zeta potential. Hence, it is unique for anionic dyes removal under a wide pH range. It showed maximum adsorption capacity 98, 85.5, 85.8, and 91%, or 199.8, 148, 167, 176.5 mg g respectively for Cr(VI), tartrazine, sunset yellow, and erythrosine. Surface adsorption of Cr(VI) and its transition into Cr(III) was confirmed by EDX. Langmuir isotherm and pseudo-first-order kinetics best fit the adsorption of Cr(VI) and azo-dyes confirming their monolayer physisorption on adsorbent surface. Synthesized adsorbent examined in wastewater purification prototype for efficient removal of different simulated wastewaters confirms its potential for real-world applications.
本研究旨在合成壳聚糖/聚乙烯醇（CS/PVA）、聚乙烯亚胺和 FeO 浸渍珠，以共同去除废水中的 Cr(VI) 和有毒偶氮染料。介孔 PEI@AC@FeO 表现出磁性，并通过更高的比孔容（2.1nm）增强物理吸附，Cr(VI) 半径为 0.044nm。此外，表面官能团（-OH、-NH、-NH、-COOH 等），特别是胺，由于正 ζ 电位增强了离子键合。因此，它在宽 pH 范围内对阴离子染料的去除具有独特性。它对 Cr(VI)、酒石黄、日落黄和赤藓红的最大吸附容量分别为 98、85.5、85.8 和 91%，或 199.8、148、167、176.5mg/g。Cr(VI) 的表面吸附及其向 Cr(III)的转化通过 EDX 得到证实。Langmuir 等温线和拟一级动力学最适合 Cr(VI)和偶氮染料的吸附，证实它们在吸附剂表面的单层物理吸附。合成的吸附剂在废水净化原型中用于去除不同模拟废水中的研究，证实了其在实际应用中的潜力。
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