An ionic liquid-modified PVC nanofiber facilitates gold recovery from wastewater by a light-enhancing effect

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2025-01-09 DOI:10.1016/j.cej.2025.159419

Yi Zhang, Haonan Dong, Wenlei Du, Chao Dong, Mingyang Xiong, Ni Yang, Sibiao Zhao, Hongxing He, Zhifeng Nie

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Abstract

The development of an effective adsorbent material for the recovery of gold from acidic wastewater is essential for the conservation of resources and the advancement of sustainable development. In this study, photoresponsive modified polyvinyl chloride nanofibers (IL-PVC) were prepared through electrospinning and ionic liquid modification and subsequently employed for gold recovery from wastewater. The adsorption capacity of IL-PVC for Au(III) was found to reach 1243.75 mg/g within 18 h under light exposure, representing a 1.6-fold increase compared to adsorption under dark conditions. Furthermore, IL-PVC demonstrated high selectivity for Au(III) in simulated wastewater, achieving a distribution coefficient as high as 531.08 L/g. IL-PVC also exhibited commendable recycling performance, with the adsorption efficiency remaining largely unchanged after six cycles. The adsorption mechanism of IL-PVC on Au(III) was elucidated through the integration of density functional theory (DFT) and X-ray photoelectron spectroscopy (XPS), which primarily involves electrostatic, coordination, and redox effects. Furthermore, the light-enhancing adsorption properties of IL-PVC were further investigated using electrochemical methods and electron paramagnetic resonance (EPR). The results indicated that this phenomenon resulted from photogenerated electrons facilitating the reduction of Au(III). In conclusion, IL-PVC with good light-enhancing adsorption properties may represent a promising material for the effective recovery of gold from wastewater.

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离子液体改性PVC纳米纤维通过增光效应促进了废水中金的回收

开发有效的吸附材料从酸性废水中回收金，对节约资源和推进可持续发展具有重要意义。本研究通过静电纺丝和离子液体改性制备了光响应改性聚氯乙烯纳米纤维（IL-PVC），并将其用于废水中金的回收。光照条件下IL-PVC对Au（III）的吸附量在18 h内达到1243.75 mg/g，比光照条件下的吸附量提高了1.6倍。IL-PVC对模拟废水中的Au（III）具有较高的选择性，分布系数高达531.08 L/g。IL-PVC也表现出良好的回收性能，经过6次循环后吸附效率基本保持不变。结合密度泛函理论（DFT）和x射线光电子能谱（XPS）分析了IL-PVC对Au（III）的吸附机理，主要涉及静电、配位和氧化还原效应。此外，利用电化学方法和电子顺磁共振（EPR）进一步研究了IL-PVC的增光吸附性能。结果表明，这种现象是由于光电子促进Au（III）的还原。综上所述，IL-PVC具有良好的增光吸附性能，是一种很有前途的有效回收废水中金的材料。

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.