Calcium-Modified Fe3O4 Nanoparticles Encapsulated in Humic Acid for the Efficient Removal of Heavy Metals from Wastewater,Langmuir

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Calcium-Modified Fe3O4 Nanoparticles Encapsulated in Humic Acid for the Efficient Removal of Heavy Metals from Wastewater
Langmuir ( IF 3.7 ) Pub Date : 2021-09-09 , DOI: 10.1021/acs.langmuir.1c01491
Shuwen Xue _{1,

2} , Jinjin Fan _{1,

2} , Keji Wan ₂ , Guoqiang Wang _{1,

2} , Yawen Xiao _{1,

2} , Wenting Bo _{1,

2} , Mingqiang Gao _{1,

2} , Zhenyong Miao _{1,

2}

Affiliation

Ca-modified Fe₃O₄ nanoparticles encapsulated in humic acid (HA-Ca/Fe₃O₄) were produced using a co-precipitation method. Furthermore, the adsorption performance of HA-Ca/Fe₃O₄ as well as the effect of coexisting ions and mechanisms were evaluated. A good description of the adsorption process was given using pseudo-second-order kinetic and Langmuir models. The adsorption capacities of HA-Ca/Fe₃O₄ for Pb²⁺, Cu²⁺, and Cd²⁺ were 208.33, 98.33, and 99.01 mg g^–1, respectively. The 0.02–0.1 times concentrations in alkali and alkaline-earth metals promoted Pb²⁺ and Cd²⁺ adsorption; however, any concentration of alkali and alkaline-earth metals inhibited Cu²⁺-ion adsorption, probably owing to the differences in ionic radii between the interfering and heavy-metal ions. Pb²⁺, Cu²⁺, and Cd²⁺ removal using HA-Ca/Fe₃O₄ occurred via ion exchange, complexation of O-containing functional groups, mineral precipitation, and π-electron coordination. A method was proposed to calculate the contribution of these mechanisms to the adsorption process. In practice, HA-Ca/Fe₃O₄ can remove 99% Pb²⁺ and 91% Cu²⁺ and Cd²⁺ from real wastewater samples. Following five adsorption–desorption cycles, HA-Ca/Fe₃O₄ adsorption capacity did not change significantly. The aforementioned results indicated that HA-Ca/Fe₃O₄ presented a good potential in removing heavy metals in wastewater.

中文翻译：

钙修饰的 Fe3O4 纳米颗粒包裹在腐殖酸中，可有效去除废水中的重金属

使用共沉淀法生产包封在腐殖酸中的Ca 修饰的 Fe ₃ O ₄纳米颗粒 (HA-Ca/Fe ₃ O ₄ )。此外，还评估了 HA-Ca/Fe ₃ O ₄的吸附性能以及共存离子和机理的影响。使用伪二级动力学和朗缪尔模型对吸附过程进行了很好的描述。HA-Ca/Fe ₃ O ₄对Pb ²⁺、Cu ²⁺和Cd ²⁺的吸附容量分别为208.33、98.33和99.01 mg g ^–1，分别。碱金属和碱土金属中0.02-0.1倍的浓度促进了Pb ²⁺和Cd ^{2+ 的}吸附；然而，任何浓度的碱金属和碱土金属都会抑制 Cu ²⁺离子的吸附，这可能是由于干扰金属离子和重金属离子之间的离子半径不同。使用HA-Ca/Fe ₃ O ₄去除Pb ²⁺、Cu ²⁺和Cd ²⁺是通过离子交换、含O 官能团的络合、矿物沉淀和π-电子配位发生的。提出了一种计算这些机制对吸附过程的贡献的方法。在实践中，HA-Ca/Fe ₃ O₄可以从实际废水样品中去除 99% Pb ²⁺和 91% Cu ²⁺和 Cd ²⁺。经过五个吸附-解吸循环后，HA-Ca/Fe ₃ O ₄吸附容量没有显着变化。上述结果表明HA-Ca/Fe ₃ O ₄在去除废水中的重金属方面表现出良好的潜力。

更新日期：2021-09-21

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