晶相组成对硫酸钙固锌的影响机理

IF 3.9 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2025-09-16 DOI:10.1021/acs.langmuir.5c03175

Yaping Zhong, , , Can Wu*, , , Hongli Liu, , , Guo Liu, , and , Zhang Lin,

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引用次数: 0

摘要

硫酸钙共沉淀法是工程上广泛采用的去除重金属离子的方法。然而，常用的二水硫酸钙（CaSO4·2H2O， DH）相去除Zn2+的效率有限。为了加强这一过程，我们调节了硫酸钙的晶相，并探讨了其组成如何影响Zn2+的固定机制。共沉淀实验表明，随着混合物中半水硫酸钙（CaSO4·0.5H2O， HH）摩尔分数的增加，硫酸钙固定Zn2+的效率提高。当HH摩尔分数超过15.6%时，固定化能力趋于平稳。机理研究表明，Zn2+主要是通过晶体水通道内的结构掺杂而不是表面吸附来固定的。在DH和HH中，锌离子占据了这些水通道，而不是取代Ca2+离子。HH中较大的水通道有助于其更大的锌离子固定化能力。然而，高浓度的Na+离子干扰HH的形成，阻止了锌离子固定能力的进一步增加，使其达到平衡。本研究为优化硫酸钙共沉淀治理水体重金属污染提供了理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Influence Mechanism of Crystal Phase Composition on the Fixation of Zinc by Calcium Sulfate

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Influence Mechanism of Crystal Phase Composition on the Fixation of Zinc by Calcium Sulfate

Calcium sulfate coprecipitation is a widely adopted method for removing heavy metal ions in engineering. However, the commonly used dihydrate calcium sulfate (CaSO₄·2H₂O, DH) phase shows limited efficiency in removing Zn²⁺ ions. To enhance this process, we regulated the crystal phase of calcium sulfate and explored how its composition affects the mechanism of Zn²⁺ immobilization. Coprecipitation experiments indicate that as the molar fraction of hemihydrate calcium sulfate (CaSO₄·0.5H₂O, HH) increases in the mixture, the efficiency of Zn²⁺ immobilization by calcium sulfate improves. When the HH molar fraction surpasses 15.6%, the immobilization capacity levels off. Mechanistic studies show that Zn²⁺ is mainly immobilized through structural doping within the crystal’s water channels rather than by surface adsorption. In both DH and HH, zinc ions occupy these water channels instead of replacing Ca²⁺ ions. The larger water channels in HH contribute to its greater capacity for zinc ion immobilization. However, high-concentration Na⁺ ions interfere with HH formation, preventing further increases in zinc ion immobilization capacity and causing it to reach equilibrium. This research offers theoretical insights for optimizing calcium sulfate coprecipitation in managing heavy metal pollution in water bodies.

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).