Selective immobilization of Pb(II) by biogenic whewellite and its mechanism

IF 6.9 Q1 Environmental Science

Journal of environmental sciences Pub Date : 2024-03-01 Epub Date: 2023-03-21 DOI:10.1016/j.jes.2023.03.014

Xingxing Wang, Kaiyan Ren, Kairui Jiao, Wenjun Nie, Xiaochi An, Bin Lian

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引用次数: 0

Abstract

The development of bio-adsorbents with highly selective immobilization properties for specific heavy metals is a great challenge, but has important application value. Biogenic whewellite (BW) with high selectivity for Pb(II) was synthesized by mineral microbial transformation. The selective immobilization properties and mechanism of BW for Pb(II) were analyzed by combining mineral characterization technology and batch adsorption research methods. The results indicated that BW can efficiently and selectively immobilize Pb(II) in single or composite heavy metal adsorption solutions, and the immobilized Pb(II) is difficult to desorb. BW undergoes monolayer adsorption on Pb(II), Q_max ≈ 1073.17 mg/g. The immobilization of Pb(II) by BW is a physico-chemical adsorption process with spontaneous heat absorption and an accompanying increase in entropy. In addition, the sequestration of Pb(II) by BW remains around 756.99 mg/g even at pH = 1. The excellent selective immobilization properties of BW for Pb(II) are closely related to its smaller K_sp, electrostatic repulsion effect, organic-inorganic composite structure, acid resistance and the formation of Pb(II) oxalate. This study provides beneficial information about the recycling of lead in acidic lead-containing wastewater and composite heavy metal contaminated water bodies.

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生物风团石对Pb（II）的选择性固定化及其机理

开发对特定重金属具有高选择性固定化性能的生物吸附剂是一个巨大的挑战，但具有重要的应用价值。采用矿物微生物转化法合成了对Pb（II）具有高选择性的生物水团石（BW）。结合矿物表征技术和间歇吸附研究方法，分析了BW对Pb（II）的选择性固定化性能和机理。结果表明，BW能有效、选择性地将Pb（II）固定在单一或复合的重金属吸附溶液中，且固定化的Pb（Ⅱ）难以解吸。BW对Pb（II）进行单层吸附，Qmax≈1073.17mg/g。BW对Pb（II）的固定化是一个具有自发吸热和伴随熵增加的物理化学吸附过程。此外，即使在pH＝1时，BW对Pb（II）的螯合仍保持在756.99mg/g左右。BW对Pb（II）具有优异的选择性固定化性能，这与其较小的Ksp、静电排斥效应、有机-无机复合结构、耐酸性和草酸铅的形成密切相关。本研究为酸性含铅废水和复合重金属污染水体中铅的回收利用提供了有益的信息。

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来源期刊

Journal of environmental sciences Environmental Science (General)

CiteScore

12.80

自引率

0.00%

发文量

审稿时长

17 days

期刊介绍： Journal of Environmental Sciences is an international peer-reviewed journal established in 1989. It is sponsored by the Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, and it is jointly published by Elsevier and Science Press. It aims to foster interdisciplinary communication and promote understanding of significant environmental issues. The journal seeks to publish significant and novel research on the fate and behaviour of emerging contaminants, human impact on the environment, human exposure to environmental contaminants and their health effects, and environmental remediation and management. Original research articles, critical reviews, highlights, and perspectives of high quality are published both in print and online.