Removal of Mn(VII) and total Mn from Mn(VII)-containing aqueous solution by multifunctional flocculant modified polyacrylamide

IF 6.3 3区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2025-08-25 DOI:10.1016/j.jtice.2025.106370

Xin Wang, Gang Wang, Yapin Yan, Meng Duan, Lingling Li, Jinling Ma

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引用次数: 0

Abstract

Background

Mn(VII) wastewater is a serious hazard to the environment; however, few existing methods can remove Mn(VII) from wastewater. In addition, unreasonable treatment methods can have a negative impact on the environment.

Method

The use of mercaptoacetyl aminomethy-polyacrylamide (MAAPAM) as a multifunctional flocculant for removing Mn(VII) and total Mn from water samples was investigated in this study. The effects of various factors, including pH, initial Mn(VII) concentration, turbidity, and coexisting ions including K⁺, Na⁺, NH₄⁺, Ca²⁺, Mg²⁺, Fe²⁺, Cl^-, and SO₄^2-, on removal efficiency was evaluated. The flocculation mechanism was elucidated through SEM and XPS analyses.

Significant Findings

Systematic testing revealed optimal removal efficiencies at pH levels of 3 and 9, achieving 100% removal efficiency for Mn(VII) and 97.93% for total Mn at an initial concentration of 25 mg/L. Other factors, such as initial Mn(VII) concentration, turbidity, and most coexisting ions, had negligible effects on removal efficiency, with the exception of Fe²⁺. Specifically, Fe²⁺ enhanced Mn(VII) removal but decreased total Mn removal due to redox interactions. Mn(VII) removal involves redox reactions, chelation, flocculation, and precipitation processes. Stable complexes with Mn(IV) were formed by the sulfydryl and amino groups on MAAPAM, while adsorption bridging facilitated the aggregation of MAAPAM-Mn flocs.

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多功能絮凝剂改性聚丙烯酰胺对含锰水溶液中锰（VII）和总锰的去除

背景锰（VII）废水对环境危害严重；然而，现有的方法很少能去除废水中的Mn（VII）。此外，不合理的处理方法会对环境产生负面影响。方法采用巯基乙酰胺-聚丙烯酰胺（MAAPAM）作为多功能絮凝剂，研究其对水中Mn（VII）和总Mn的去除效果。考察了pH、初始Mn（VII）浓度、浊度以及共存离子K+、Na+、NH4+、Ca2+、Mg2+、Fe2+、Cl-和SO42-等因素对去除率的影响。通过SEM和XPS分析阐明了絮凝机理。系统测试结果表明，pH为3和9时的去除率最高，初始浓度为25 mg/L时，Mn（VII）的去除率为100%，总Mn的去除率为97.93%。除Fe2+外，其他因素，如初始Mn（VII）浓度、浊度和大多数共存离子，对去除效率的影响可以忽略不计。具体来说，Fe2+增强了Mn（VII）的去除，但由于氧化还原相互作用，减少了总Mn的去除。锰（VII）的去除包括氧化还原反应、螯合、絮凝和沉淀过程。MAAPAM上的巯基和氨基与Mn（IV）形成稳定的配合物，吸附桥接促进了MAAPAM-Mn絮凝体的聚集。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.