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.
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。
