{"title":"Enhanced Removal of Lead Complexes Using Phosphide-Modified Nanoscale Zero-Valent Iron: The Boosting Impact of the Iron Cycle","authors":"Rui Li, Xinya Liu, Xiao Ge, Xiaozhi Wang","doi":"10.1016/j.jclepro.2025.145336","DOIUrl":null,"url":null,"abstract":"Heavy metal complexes, known for their high stability, present significant challenges for removal using conventional methods. In this study, we propose a novel one-step approach for eliminating Pb-EDTA from wastewater, using phosphide-modified nano-zero-valent iron (P-NZVI). Through comprehensive isotherms and kinetic analyses, we demonstrate the critical role of NaH<sub>2</sub>PO<sub>4</sub> as the phosphorus source in P-NZVI synthesis. Our results show that P-NZVI achieves an exceptional adsorption capacity for Pb-EDTA, reaching up to 256.9 mg Pb/g, with a kinetic constant of 0.011 g/(mg·min). The removal mechanism involves the displacement of complexed Pb by Fe(Ⅲ) and the subsequent sequestration of released Pb by P-NZVI. Additionally, we observe that ultraviolet light initiates the photolysis of Fe(Ⅲ)-EDTA, converting Fe(Ⅲ) to Fe(Ⅱ) in the solution. This transformation triggers an iron cycling process, further promoting the decomplexation of Pb-EDTA. Moreover, P-NZVI maintains robust performance even in the presence of high concentrations of coexisting ions (25 g/L), while generating minimal toxic leaching from the reaction residue. Importantly, our studies confirm the effective performance of P-NZVI in real-world wastewater scenarios. In conclusion, P-NZVI proves to be a highly effective material for the removal of Pb complexes under challenging water conditions, offering a simple yet effective process with significant environmental benefits.","PeriodicalId":349,"journal":{"name":"Journal of Cleaner Production","volume":"24 1","pages":""},"PeriodicalIF":9.7000,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Cleaner Production","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1016/j.jclepro.2025.145336","RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0
Abstract
Heavy metal complexes, known for their high stability, present significant challenges for removal using conventional methods. In this study, we propose a novel one-step approach for eliminating Pb-EDTA from wastewater, using phosphide-modified nano-zero-valent iron (P-NZVI). Through comprehensive isotherms and kinetic analyses, we demonstrate the critical role of NaH2PO4 as the phosphorus source in P-NZVI synthesis. Our results show that P-NZVI achieves an exceptional adsorption capacity for Pb-EDTA, reaching up to 256.9 mg Pb/g, with a kinetic constant of 0.011 g/(mg·min). The removal mechanism involves the displacement of complexed Pb by Fe(Ⅲ) and the subsequent sequestration of released Pb by P-NZVI. Additionally, we observe that ultraviolet light initiates the photolysis of Fe(Ⅲ)-EDTA, converting Fe(Ⅲ) to Fe(Ⅱ) in the solution. This transformation triggers an iron cycling process, further promoting the decomplexation of Pb-EDTA. Moreover, P-NZVI maintains robust performance even in the presence of high concentrations of coexisting ions (25 g/L), while generating minimal toxic leaching from the reaction residue. Importantly, our studies confirm the effective performance of P-NZVI in real-world wastewater scenarios. In conclusion, P-NZVI proves to be a highly effective material for the removal of Pb complexes under challenging water conditions, offering a simple yet effective process with significant environmental benefits.
期刊介绍:
The Journal of Cleaner Production is an international, transdisciplinary journal that addresses and discusses theoretical and practical Cleaner Production, Environmental, and Sustainability issues. It aims to help societies become more sustainable by focusing on the concept of 'Cleaner Production', which aims at preventing waste production and increasing efficiencies in energy, water, resources, and human capital use. The journal serves as a platform for corporations, governments, education institutions, regions, and societies to engage in discussions and research related to Cleaner Production, environmental, and sustainability practices.