Efficient photocatalytic reduction of aqueous Cr (VI) by MXene-(Ti3C2, Mo4/3C) and Ca2Fe2O5-based nanocomposites

IF 7.4 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering Pub Date : 2025-03-17 DOI:10.1016/j.jece.2025.116169

Durga Sankar Vavilapalli, Leiqiang Qin, Ali Saffar Shamshirgar, Johanna Rosen

{"title":"Efficient photocatalytic reduction of aqueous Cr (VI) by MXene-(Ti3C2, Mo4/3C) and Ca2Fe2O5-based nanocomposites","authors":"Durga Sankar Vavilapalli, Leiqiang Qin, Ali Saffar Shamshirgar, Johanna Rosen","doi":"10.1016/j.jece.2025.116169","DOIUrl":null,"url":null,"abstract":"<div><div>The reduction of highly toxic hexavalent chromium (Cr(VI)) to less toxic trivalent chromium (Cr(III)) in aquatic environments is a critical research topic. Photocatalytic reduction of Cr(VI) is a green and promising approach, and in this study, brownmillerite Ca2Fe2O5 (CFO) and MXene-based (Ti3C2, Mo4/3C) nanocomposites were prepared for the photoreduction of Cr(VI) to Cr(III) under simulated sunlight. An electrostatic assembly, as concluded from X-ray photoelectron spectroscopy data, of CFO nanoparticles and MXene nanosheets significantly improved charge separation and enhanced the photocatalytic performance by forming a Schottky junction. Photoluminescence spectra showed a faster electron transfer from MXene to CFO, reducing recombination losses. The nanocomposites achieved 96 % Cr(VI) reduction with a rate constant of k = 0.0577 min−1 in 60 minutes using Ti3C2-CFO, and 99 % reduction with a rate constant of k = 0.0911 min−1 in 50 minutes using Mo4/3C-CFO. This study provides valuable insights into MXene-based photocatalysts for efficient environmental remediation.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"13 3","pages":"Article 116169"},"PeriodicalIF":7.4000,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Environmental Chemical Engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2213343725008656","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}

引用次数: 0

Abstract

The reduction of highly toxic hexavalent chromium (Cr(VI)) to less toxic trivalent chromium (Cr(III)) in aquatic environments is a critical research topic. Photocatalytic reduction of Cr(VI) is a green and promising approach, and in this study, brownmillerite Ca₂Fe₂O₅ (CFO) and MXene-based (Ti₃C₂, Mo_4/3C) nanocomposites were prepared for the photoreduction of Cr(VI) to Cr(III) under simulated sunlight. An electrostatic assembly, as concluded from X-ray photoelectron spectroscopy data, of CFO nanoparticles and MXene nanosheets significantly improved charge separation and enhanced the photocatalytic performance by forming a Schottky junction. Photoluminescence spectra showed a faster electron transfer from MXene to CFO, reducing recombination losses. The nanocomposites achieved 96 % Cr(VI) reduction with a rate constant of k = 0.0577 min⁻¹ in 60 minutes using Ti₃C₂-CFO, and 99 % reduction with a rate constant of k = 0.0911 min⁻¹ in 50 minutes using Mo_4/3C-CFO. This study provides valuable insights into MXene-based photocatalysts for efficient environmental remediation.

查看原文本刊更多论文

MXene-(Ti3C2, Mo4/3C)和ca2fe2o5基纳米复合材料光催化还原水中Cr （VI）的研究

将水生环境中的剧毒六价铬（Cr(VI)）还原为毒性较低的三价铬（Cr(III)）是一个重要的研究课题。本研究制备了褐铁矿 Ca2Fe2O5（CFO）和基于 MXene（Ti3C2、Mo4/3C）的纳米复合材料，用于在模拟阳光下将 Cr(VI) 光还原成 Cr(III)。根据 X 射线光电子能谱数据得出的结论，CFO 纳米颗粒和 MXene 纳米片的静电组装通过形成肖特基结，显著改善了电荷分离并提高了光催化性能。光致发光光谱显示，从 MXene 到 CFO 的电子转移速度更快，从而减少了重组损耗。使用 Ti3C2-CFO 的纳米复合材料在 60 分钟内实现了 96% 的六价铬还原率，速率常数为 k = 0.0577 min-1；使用 Mo4/3C-CFO 的纳米复合材料在 50 分钟内实现了 99% 的六价铬还原率，速率常数为 k = 0.0911 min-1。这项研究为基于 MXene 的光催化剂用于高效环境修复提供了宝贵的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.