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用于选择性高效吸附汞的腐殖酸/l-半胱氨酸共修饰磁性FeO纳米颗粒的制备

Preparation of Humic Acid/l-Cysteine-Codecorated Magnetic FeO Nanoparticles for Selective and Highly Efficient Adsorption of Mercury.

作者信息

Wan Keji, Wang Guoqiang, Xue Shuwen, Xiao Yawen, Fan Jinjin, Li Longdi, Miao Zhenyong

机构信息

National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.

School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.

出版信息

ACS Omega. 2021 Mar 12;6(11):7941-7950. doi: 10.1021/acsomega.1c00583. eCollection 2021 Mar 23.

DOI:10.1021/acsomega.1c00583
PMID:33778305
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7992173/
Abstract

Humic acid and l-cysteine-codecorated magnetic FeO nanoparticles (HA/LC-MNPs) were synthesized using a coprecipitation method. Humic acid fractions abundant with carboxyl and hydroxyl groups can be selectively coated on the surface of MNPs during synthesis. HA/LC-MNPs with abundant heteroatoms (N, S, and O) show excellent removal capacity, great selectivity, and also fast trapping of Hg in a wide pH range. The adsorption capacity of HA/LC-MNPs for Hg can reach 206.5 mg/g, and the chemisorption was attributed to the major adsorption form. In competitive adsorption, HA/LC-MNPs preferentially adsorbed Hg with an affinity order of Hg > > Pb > Cu ≫ Zn > Cd. In total, 93.91% of Hg can be quickly captured in the presence of a 6000 times higher concentration of competing metal ions (Pb, Cu, Cd, and Zn) within 30 min. The adsorption mechanism was analyzed using X-ray photoelectron spectroscopy (XPS). It suggested that the HA/LC-MNPs enhanced the adsorption capacity of Hg because of the complexing abilities of the multiple thiol, amino, and carboxyl groups in sorbents with Hg, the ion exchange ability of the carboxyl group, and the negative charge surface. All in all, HA/LC-MNPs are a potentially useful and economic material for the selective removal of Hg from polluted water.

摘要

采用共沉淀法合成了腐殖酸和L-半胱氨酸共修饰的磁性FeO纳米颗粒（HA/LC-MNPs）。在合成过程中，富含羧基和羟基的腐殖酸组分可选择性地包覆在MNPs表面。具有丰富杂原子（N、S和O）的HA/LC-MNPs在较宽的pH范围内表现出优异的去除能力、高选择性以及对汞的快速捕获能力。HA/LC-MNPs对汞的吸附容量可达206.5 mg/g，化学吸附是主要的吸附形式。在竞争吸附中，HA/LC-MNPs优先吸附汞，其亲和顺序为Hg >> Pb > Cu ≫ Zn > Cd。在存在浓度高6000倍的竞争金属离子（Pb、Cu、Cd和Zn）的情况下，30分钟内可快速捕获93.91%的汞。采用X射线光电子能谱（XPS）分析吸附机理。结果表明，HA/LC-MNPs提高了对汞的吸附容量，这是由于吸附剂中多个巯基、氨基和羧基与汞的络合能力、羧基的离子交换能力以及表面负电荷所致。总之，HA/LC-MNPs是一种从污染水中选择性去除汞的潜在有用且经济的材料。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c200/7992173/2fc18eeb68ef/ao1c00583_0010.jpg
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