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摘要
硫酸锰溶液中重金属离子的深度净化,一直是锰行业研究的热点和重点。利用X射线衍射(XRD)、扫描电镜(SEM)和红外光谱(FT-IR)等手段对所制备的δ-MnO2进行表征,利用Visual Minteq软件模拟硫酸锰溶液中Mn、Co和Ni的离子形态随pH的变化关系,研究不同pH条件对δ-MnO2吸附硫酸锰溶液中Co2+、Ni2+的影响。结果表明:δ-MnO2结晶性较差,缺陷和空隙较多,表面羟基丰富。随着硫酸锰溶液pH升高,δ-MnO2对于Co2+和Ni2+吸附率逐渐增加,Co2+比Ni2+更容易被吸附。在低pH下,δ-MnO2吸附效果受结构缺陷和空隙影响,pH高于5时,在表面负电荷和羟基的共同作用下大量吸附Co2+和Ni2+,Co2+、Ni2+吸附率最高达到99.98%、89.53%。对吸附后δ-MnO2进行XRD和FT-IR分析进一步验证了吸附机理,为解决锰系电池原材料硫酸锰溶液中重金属杂质离子难去除问题提供一定基础。
Abstract
The deep purification of heavy metal ions in manganese sulfate solution has been a hot spot and focus of research in the manganese industry.In this paper,XRD,SEM and FT-IR were used to characterize prepared δ-MnO2.Visual Minteq software was applied to simulate the ionic forms of Mn,Co and Ni in manganese sulfate solution and then the effects of different pH on the adsorption of Co2+ and Ni2+ in manganese sulfate solution by δ-MnO2 were investigated.The results showed that δ-MnO2 had poor crystallinity,more defects and voids,but had rich surface hydroxyl groups.With the increase of pH of manganese sulfate solution,the adsorption rates of δ-MnO2 to Co2+ and Ni2+ gradually increased,and Co2+ was easier to be adsorbed than Ni2+.At low pH,the adsorption effect of δ-MnO2 was affected by structural defects and voids.When pH was higher than 5,a large amount of Co2+ and Ni2+ was adsorbed under the synergy of surface negative charge and hydroxyl,and the adsorption rates of Co2+ and Ni2+ reached up to 99.98% and 89.53%,respectively.XRD and FT-IR analysis of δ-MnO2 after adsorption further verified the adsorption mechanism,which provided a basis for solving the difficult removal of heavy metal ions in manganese sulfate solution of raw material of manganese battery.
关键词
δ-MnO2
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吸附
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硫酸锰溶液
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Co2+
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Ni2+
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pH
Key words
δ-MnO2
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adsorption
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manganese sulfate solution
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Co2+
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Ni2+
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pH
pH对δ-MnO2吸附硫酸锰溶液中Co2+、Ni2+的影响[J].
化工新型材料, 2023, 51(2): 198-201 DOI:10.19817/j.cnki.issn1006-3536.2023.02.040
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基金资助
国家自然科学基金(51764006和51864012);贵州省科学合作计划项目([2016]5302、[2017]5788、[2018]5781、[2019]1411和[2019]2841)
