Porous polymer monolithic scaffold decorated visible light responsive Bi2S3-Nb2O5 heterostructured renewable photocatalysts for the fast dissipation of contaminants of emerging concern

IF 7.2 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering Pub Date : 2025-09-15 DOI:10.1016/j.jece.2025.119296

Denna Babu, Prabhakaran Deivasigamani

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引用次数: 0

Abstract

In this study, we report a novel (30 %)Bi₂S₃-(70 %)Nb₂O₅ heterostructure nanocomposite (NC), referred to as BSNO (30/70), rationally integrated onto a translucent macro-/meso-porous poly(ethylene glycol dimethacrylate) monolith (PO) to obtain a renewable, visible-light-responsive photocatalyst, denoted as PO-BSNO (30/70), for the decontamination of carcinogenic hexavalent chromium (Cr(VI)) and mutagenic bisphenol A (BPA). PO-BSNO (30/70) photocatalyst exhibits exceptional structural features and a highly porous architecture, as confirmed by high-resolution transmission electron microscopy (HR-TEM) and field emission scanning electron microscopy (FE-SEM). UV-Visible diffuse reflectance spectroscopy (UV-Vis DRS) analysis indicates a narrowed energy band gap, enabling visible-light activity in both BSNO (30/70) and PO-BSNO (30/70) photocatalysts. Photoluminescence spectroscopy (PLS), electrochemical impedance spectroscopy (EIS), and photocurrent measurements collectively demonstrate reduced charge carrier recombination and enhanced charge transfer for the monolithic photocatalyst. Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH) analyses reveal that PO-BSNO (30/70) possesses a larger surface area and improved porosity relative to BSNO NCs. Mott-Schottky (M-S) analysis, X-ray photoelectron spectroscopy (XPS), and valence band XPS (VB-XPS) are employed to evaluate the semiconductor behavior, band edge positions, and oxidation states of elements, elucidating the photocatalytic mechanism. The PO-BSNO (30/70) photocatalyst enables efficient photoreduction of Cr(VI) at pH 2.0 and near-complete BPA degradation at pH 3.0 using a 50 mg dosage. The presence of formic acid enhances Cr(VI) reduction efficiency to 97.0 %, while 3.0 mM H₂O₂ accelerates BPA degradation to 98.5 % within 1 h. The proposed monolithic photocatalyst demonstrates excellent stability, reusability, and strong potential for advanced water decontamination under visible-light irradiation.

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多孔聚合物单片支架装饰的可见光响应Bi2S3-Nb2O5异质结构可再生光催化剂对污染物的快速耗散日益受到关注

在这项研究中，我们报道了一种新的（30 %）Bi2S3-(70 %)Nb2O5异质结构纳米复合材料（NC），称为BSNO(30/70)，将其合理地集成到半透明的宏/介孔聚乙二醇二甲基丙烯酸酯单体（PO）上，得到一种可再生的可见光响应光催化剂，称为PO-BSNO(30/70)，用于净化致癌六价铬（Cr(VI)）和致突变双酚a （BPA）。高分辨率透射电子显微镜（HR-TEM）和场发射扫描电子显微镜（FE-SEM）证实，PO-BSNO（30/70）光催化剂具有独特的结构特征和高多孔结构。紫外-可见漫反射光谱（UV-Vis DRS）分析表明，BSNO（30/70）和PO-BSNO（30/70）光催化剂的能带隙缩小，使其具有可见光活性。光致发光光谱（PLS）、电化学阻抗光谱（EIS）和光电流测量共同证明了单片光催化剂减少了载流子重组和增强了电荷转移。brunauer - emmet - teller （BET）和Barrett-Joyner-Halenda （BJH）分析表明，与BSNO NCs相比，PO-BSNO（30/70）具有更大的表面积和更高的孔隙度。采用Mott-Schottky （M-S）分析、x射线光电子能谱（XPS）和价带XPS （VB-XPS）对元素的半导体行为、能带边缘位置和氧化态进行了评价，阐明了光催化机理。PO-BSNO（30/70）光催化剂在pH为2.0时能有效光还原Cr(VI)，在pH为3.0时用量为50 mg时能几乎完全降解BPA。甲酸的存在使Cr（VI）的还原效率提高到97.0 %，而3.0 mM H2O2在1 h内使BPA的降解效率提高到98.5% %。所提出的单片光催化剂在可见光照射下具有优异的稳定性、可重复使用性和强大的水净化潜力。

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来源期刊

Journal of Environmental Chemical Engineering Environmental Science-Pollution

CiteScore

11.40

自引率

6.50%

发文量

2017

审稿时长

27 days

期刊介绍： The Journal of Environmental Chemical Engineering (JECE) serves as a platform for the dissemination of original and innovative research focusing on the advancement of environmentally-friendly, sustainable technologies. JECE emphasizes the transition towards a carbon-neutral circular economy and a self-sufficient bio-based economy. Topics covered include soil, water, wastewater, and air decontamination; pollution monitoring, prevention, and control; advanced analytics, sensors, impact and risk assessment methodologies in environmental chemical engineering; resource recovery (water, nutrients, materials, energy); industrial ecology; valorization of waste streams; waste management (including e-waste); climate-water-energy-food nexus; novel materials for environmental, chemical, and energy applications; sustainability and environmental safety; water digitalization, water data science, and machine learning; process integration and intensification; recent developments in green chemistry for synthesis, catalysis, and energy; and original research on contaminants of emerging concern, persistent chemicals, and priority substances, including microplastics, nanoplastics, nanomaterials, micropollutants, antimicrobial resistance genes, and emerging pathogens (viruses, bacteria, parasites) of environmental significance.