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壳生物质材料负载纳米零价铁去除水中的铅和镉。

Shell biomass material supported nano-zero valent iron to remove Pb and Cd in water.

作者信息

Wang Zheng, Wu Xique, Luo Shengxu, Wang Yanshi, Tong Zhuang, Deng Qin

机构信息

School of Science, Hainan University, Haikou 570228, People's Republic of China.

School of Chemical Engineering and Technology, Hainan University, Haikou 570228, People's Republic of China.

出版信息

R Soc Open Sci. 2020 Oct 28;7(10):201192. doi: 10.1098/rsos.201192. eCollection 2020 Oct.

DOI:10.1098/rsos.201192
PMID:33204474
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7657911/
Abstract

Nanoscale zero-valent iron (NZVI) has a high adsorption capacity for heavy metals, but easily forms aggregates. Herein, preprocessed undulating venus shell (UVS) is used as support material to prevent NZVI from reuniting. The SEM and TEM results show that UVS had a porous layered structure and NZVI particles were evenly distributed on the UVS surface. A large number of adsorption sites on the surface of UVS-NZVI are confirmed by IR and XRD. UVS-NZVI is used for adsorption of Pb and Cd at pH = 6.00 in aqueous solution, and the experimental adsorption capacities are 29.91 and 38.99 mg g at optimal pH, respectively. Thermodynamic studies indicate that the adsorption of ions by UVS-NZVI is more in line with the Langmuir model when Pb or Cd existed alone. For the mixed solution of Pb and Cd, only the adsorption of Pb by UVS-NZVI conforms to the Langmuir model. In addition, the maximum adsorption capacities of UVS-NZVI for Pb and Cd are 93.01 and 46.07 mg g, respectively. Kinetic studies demonstrate that the determination coefficients ( ) of the pseudo first-order kinetic model for UVS-NZVI adsorption of Cd and Pb are higher than those of the pseudo second-order kinetic model and Elovich kinetic model. Highly efficient performance for metal removal makes UVS-NZVI show potential application to heavy metal ion adsorption.

摘要

纳米零价铁（NZVI）对重金属具有较高的吸附能力，但容易形成团聚体。在此，预处理的波纹维纳斯贝壳（UVS）被用作载体材料以防止NZVI团聚。扫描电子显微镜（SEM）和透射电子显微镜（TEM）结果表明，UVS具有多孔层状结构，NZVI颗粒均匀分布在UVS表面。红外光谱（IR）和X射线衍射（XRD）证实了UVS-NZVI表面存在大量吸附位点。UVS-NZVI用于在水溶液pH = 6.00时吸附Pb和Cd，在最佳pH下的实验吸附容量分别为29.91和38.99 mg/g。热力学研究表明，当单独存在Pb或Cd时，UVS-NZVI对离子的吸附更符合朗缪尔模型。对于Pb和Cd的混合溶液，只有UVS-NZVI对Pb的吸附符合朗缪尔模型。此外，UVS-NZVI对Pb和Cd的最大吸附容量分别为93.01和46.07 mg/g。动力学研究表明，UVS-NZVI吸附Cd和Pb的准一级动力学模型的决定系数（ ）高于准二级动力学模型和埃洛维奇动力学模型。UVS-NZVI在去除金属方面的高效性能使其在重金属离子吸附方面具有潜在应用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/d7c6a726838f/rsos201192-g18.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/4fcd7a9e5389/rsos201192-g9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/9ae6361e0678/rsos201192-g10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/06b89369f53d/rsos201192-g11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/0e99401eb85a/rsos201192-g12.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/4b17a3fb765d/rsos201192-g13.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/b4f046982f27/rsos201192-g14.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/5da216a6928a/rsos201192-g15.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/9b19753c68bd/rsos201192-g16.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/5f42151a6130/rsos201192-g17.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/d7c6a726838f/rsos201192-g18.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/4fcd7a9e5389/rsos201192-g9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/9ae6361e0678/rsos201192-g10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/06b89369f53d/rsos201192-g11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/0e99401eb85a/rsos201192-g12.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/4b17a3fb765d/rsos201192-g13.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/b4f046982f27/rsos201192-g14.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/5da216a6928a/rsos201192-g15.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/9b19753c68bd/rsos201192-g16.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/5f42151a6130/rsos201192-g17.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/55bb/7657911/d7c6a726838f/rsos201192-g18.jpg

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