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赤铁矿是一种常见的铁氧化物矿物，其晶面结构制约着无机离子[如W(VI)]在地表环境(土壤、水体等)的迁移、转化乃至归趋。基于此，首先合成了具有不同主暴露晶面的赤铁矿纳米晶(Hem-001、Hem-012),研究了赤铁矿不同晶面对W(VI)的吸附特征(吸附动力学、吸附等温曲线、溶液pH)的影响。结果表明，赤铁矿{012}晶面(Hem-012)对W(VI)的吸附性强于{001}晶面(Hem-001),最大吸附量分别为73.3,57.5 mg/g,二者对W(VI)的吸附均遵循准二级动力学模型，且都符合Langmuir和Freundlich等温吸附模型。Hem-001和Hem-012对W(VI)的吸附量随溶液pH升高均大幅降低。上述结果从晶面角度理解赤铁矿与环境污染物之间的相互作用提供了新视角，也为开发高效的钨污染治理材料提供了科学依据。
Abstract：Hematite, a prevalent iron oxide mineral, influences the migration, transformation, and fate of inorganic ions like W(VI) in surface environments such as soil and water bodies, due to its crystal face structure.Based on this, hematite nanocrystals with distinct dominant exposed crystal facets(Hem-001,Hem-012) were synthesized to investigate the effect of their facets on adsorption characteristics of W(VI),including kinetics, isotherms, and solution pH.Hematite nanocrystals with the {012} crystal facet(Hem-012) exhibited a stronger W(VI) adsorption capacity than those with the {001} crystal facet(Hem-001),with maximum capacities of 73.3,57.5 mg/g, respectively.Both crystal facets' adsorption of W(VI) followed the pseudo-second-order kinetic model and conformed to Langmuir and Freundlich isotherm adsorption models.The adsorption capacity of Hem-001 and Hem-012 for W(VI) significantly decreased with increasing solution pH.These results provide a new perspective for understanding the interactions between hematite and environmental pollutants from the crystal facet angle and also offer a scientific basis for the development of efficient tungsten pollution control materials.
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基本信息:
DOI：10.16581/j.cnki.issn1671-3206.20260106.002
中图分类号:O647.3;X505;P579
引用信息:
[1]罗才贵,高琦,柳殷,等.赤铁矿对钨酸根吸附性能的晶面依赖性研究[J].应用化工,2026,55(02):291-296.DOI:10.16581/j.cnki.issn1671-3206.20260106.002.
基金信息:
国家自然科学基金项目(41902038); 中国博士后科学基金面上项目(2018M643218); 钨资源高效开发及应用教育部工程研究中心开放课题W(Ⅵ)阴离子在赤铁矿晶面上的吸附机制研究
2026-02-15
2026-02-15
2026-01-06