Polydopamine-integrated cellulose/graphene oxide monoliths: A versatile platform for efficient continuous-flow iodine capture and photothermal-enhanced reduction of Cr(VI)

IF 10.7 1区 化学 Q1 CHEMISTRY, APPLIED
Astrini Pradyasti , Myeong Joo Lee , Haiji Huang , Won Mook Choi , Mun Ho Kim
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Abstract

The global challenge of wastewater contamination, especially from persistent pollutants like radioactive isotopes and heavy metals, demands innovative purification solutions. Radioactive iodine isotopes (131I and 129I), stemming from nuclear activities, pose serious health risks due to their mobility, bioaccumulation, and ionizing radiation, particularly impacting thyroid health. Similarly, hexavalent chromium, Cr(VI), is highly toxic and persistent in water, linked to cancer and other severe health issues. Developing effective technologies for iodine capture and Cr(VI) reduction is therefore critical for public health and environmental protection. This study presents two distinct cellulose-based composite materials tailored for environmental remediation: cellulose/graphene oxide/polydopamine (cellulose/GO/PDA) monoliths for iodine capture and cellulose/graphene oxide/polydopamine/palladium nano-crystals (cellulose/GO/PDA/Pd) monoliths for the reduction of Cr(VI). PDA substantially enhances the adsorptive, catalytic and photothermal properties of monoliths. The monoliths demonstrated exceptional performance in both batch and continuous-flow reactor studies. Complete iodine removal was achieved within 15 s, while Cr(VI) was entirely reduced within 9 min under dark conditions and 5 min under photothermal conditions. Continuous-flow experiments showed sustained iodine adsorption of 92 % and Cr(VI) reduction of 81 % over 240 min. This research highlights the potential of PDA-enhanced cellulose-based composites as highly efficient and sustainable platforms for practical water remediation and environmental protection.

Abstract Image

聚多巴胺集成纤维素/氧化石墨烯单体:高效连续流碘捕获和光热增强Cr(VI)还原的多功能平台
废水污染的全球挑战,特别是来自放射性同位素和重金属等持久性污染物的挑战,需要创新的净化解决方案。核活动产生的放射性碘同位素(131I和129I)由于其流动性、生物蓄积性和电离辐射而构成严重的健康风险,特别是影响甲状腺健康。同样,六价铬(Cr(VI))在水中具有剧毒和持久性,与癌症和其他严重的健康问题有关。因此,开发有效的捕获碘和减少铬(六)的技术对公众健康和环境保护至关重要。本研究提出了两种不同的用于环境修复的纤维素基复合材料:用于碘捕获的纤维素/氧化石墨烯/聚多巴胺(纤维素/氧化石墨烯/PDA)单体材料和用于还原Cr(VI)的纤维素/氧化石墨烯/聚多巴胺/钯纳米晶体(纤维素/氧化石墨烯/PDA/Pd)单体材料。PDA大大提高了单体材料的吸附、催化和光热性能。该单体在间歇式和连续流反应器研究中均表现出优异的性能。碘在15 s内完全去除,Cr(VI)在黑暗条件下在9 min内完全还原,光热条件下在5 min内完全还原。连续流实验表明,在240分钟内,持续吸附碘92%,减少铬(VI) 81%。该研究强调了pda增强纤维素基复合材料作为高效可持续的水修复和环境保护平台的潜力。
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来源期刊
Carbohydrate Polymers
Carbohydrate Polymers 化学-高分子科学
CiteScore
22.40
自引率
8.00%
发文量
1286
审稿时长
47 days
期刊介绍: Carbohydrate Polymers stands as a prominent journal in the glycoscience field, dedicated to exploring and harnessing the potential of polysaccharides with applications spanning bioenergy, bioplastics, biomaterials, biorefining, chemistry, drug delivery, food, health, nanotechnology, packaging, paper, pharmaceuticals, medicine, oil recovery, textiles, tissue engineering, wood, and various aspects of glycoscience. The journal emphasizes the central role of well-characterized carbohydrate polymers, highlighting their significance as the primary focus rather than a peripheral topic. Each paper must prominently feature at least one named carbohydrate polymer, evident in both citation and title, with a commitment to innovative research that advances scientific knowledge.
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