Natural siderite and calcium-derived Siderite/Ca composites for wastewater phosphate adsorption: Preparation, properties and mechanism

IF 4.9 2区 化学 Q2 CHEMISTRY, PHYSICAL
Can Yang , Yan Wang , Jinquan Wan , Bin Zhu
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Abstract

The effective removal of phosphate from wastewater and prevention of eutrophication of water bodies are of great significance. This study develops and compares the phosphorus removal performance of natural siderite with three different modification methods: thermal activation, hydrothermal treatment, and surface precipitation. The calcium-modified siderite composite (SID-Ca) exhibited excellent phosphorus removal performance for low to medium concentration phosphate wastewater (PO43--P < 15 mg/L), with a maximum adsorption capacity of 33.4 mg/g, which was 7.4 and 5.3 times higher than that of natural siderite (SID) (4.51 mg/g) and hydrothermally treated siderite (SID-H) (6.28 mg/g), respectively. SID-Ca did not show significant differences in adsorption performance at high levels of co-existing ions (SO42-, NO3-) at 500 mg/L. Following characterisation by XRD, XPS, FTIR and MAPPING, it was concluded that the phosphorus removal mechanism of the SID-Ca composites was primarily the inner complexation in ion exchange and ligand exchange. By leveraging the exceptional stability and low cost of natural siderite to develop a modified siderite using straightforward co-precipitation, a novel approach for phosphate adsorption in wastewater was established, and its removal mechanism was elucidated.
天然菱铁矿及钙衍生菱铁矿/钙复合材料对废水磷酸盐的吸附:制备、性能及机理
有效去除废水中的磷酸盐,防止水体富营养化具有重要意义。本研究开发并比较了天然菱铁矿在热活化、水热处理和表面沉淀三种不同改性方法下的除磷性能。钙修饰菱铁矿复合材料(SID- ca)对中低浓度磷酸盐废水(PO43—P <; 15 mg/L)表现出优异的除磷性能,最大吸附量为33.4 mg/g,分别是天然菱铁矿(SID)(4.51 mg/g)和水热处理菱铁矿(SID- h)(6.28 mg/g)的7.4和5.3倍。SID-Ca对共存离子(SO42-、NO3-)在500 mg/L时的吸附性能无显著差异。通过XRD、XPS、FTIR和MAPPING等表征,表明SID-Ca复合材料的除磷机理主要是离子交换和配体交换中的内部络合作用。利用天然菱铁矿优异的稳定性和低廉的成本,采用直接共沉淀法制备改性菱铁矿,建立了一种吸附废水中磷酸盐的新方法,并对其去除机理进行了探讨。
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
CiteScore
8.70
自引率
9.60%
发文量
2421
审稿时长
56 days
期刊介绍: Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.
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