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用于氟化物吸附的多孔氧化镁纳米片改性活性炭纤维毡的合成与表征

Synthesis and Characterization of Porous MgO Nanosheet-Modified Activated Carbon Fiber Felt for Fluoride Adsorption.

作者信息

Wang De-Cai, Xu Min-Da, Jin Zhen, Xiao Yi-Fan, Chao Yang, Li Jie, Chen Shao-Hua, Ding Yi

机构信息

Anhui Advanced Building Materials Engineering Laboratory, Anhui Jian Zhu University, Hefei 230601, China.

School of Materials and Chemical Engineering, Anhui Jian Zhu University, Hefei 230601, China.

出版信息

Nanomaterials (Basel). 2023 Mar 16;13(6):1082. doi: 10.3390/nano13061082.

DOI:10.3390/nano13061082
PMID:36985976
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10051765/
Abstract

In the present work, the porous MgO nanosheet-modified activated carbon fiber felt (MgO@ACFF) was prepared for fluoride removal. The MgO@ACFF was characterized by XRD, SEM, TEM, EDS, TG, and BET. The fluoride adsorption performance of MgO@ACFF also has been investigated. The adsorption rate of the MgO@ACFF toward fluoride is fast; more than 90% of the fluoride ions can be adsorbed within 100 min, and the adsorption kinetics of MgO@ACFF can be fitted in a pseudo-second-order model. The adsorption isotherm of MgO@ACFF fitted well in the Freundlich model. Additionally, the fluoride adsorption capacity of MgO@ACFF is larger than 212.2 mg/g at neutral. In a wide pH range of 2-10, the MgO@ACFF can efficiently remove fluoride from water, which is meaningful for practical usage. The effect of co-existing anions on the fluoride removal efficiency of the MgO@ACFF also has been studied. Furthermore, the fluoride adsorption mechanism of the MgO@ACFF was studied by the FTIR and XPS, and the results reveal a hydroxyl and carbonate co-exchange mechanism. The column test of the MgO@ACFF also has been investigated; 505-bed volumes of 5 mg/L fluoride solution can be treated with effluent under 1.0 mg/L. It is believed that the MgO@ACFF is a potential candidate for a fluoride adsorbent.

摘要

在本工作中，制备了多孔氧化镁纳米片改性的活性炭纤维毡（MgO@ACFF）用于去除氟化物。通过XRD、SEM、TEM、EDS、TG和BET对MgO@ACFF进行了表征。还研究了MgO@ACFF对氟化物的吸附性能。MgO@ACFF对氟化物的吸附速率很快；在100分钟内可吸附超过90%的氟离子，且MgO@ACFF的吸附动力学可以用准二级模型拟合。MgO@ACFF的吸附等温线与Freundlich模型拟合良好。此外，MgO@ACFF在中性条件下对氟化物的吸附容量大于212.2 mg/g。在2 - 10的宽pH范围内，MgO@ACFF可以有效地从水中去除氟化物，这对于实际应用具有重要意义。还研究了共存阴离子对MgO@ACFF除氟效率的影响。此外，通过FTIR和XPS研究了MgO@ACFF的氟化物吸附机理，结果揭示了羟基和碳酸根共交换机理。还对MgO@ACFF进行了柱试验；505床体积的5 mg/L氟化物溶液经处理后出水氟化物浓度低于1.0 mg/L。认为MgO@ACFF是一种有潜力的氟化物吸附剂。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/1557d9fbab14/nanomaterials-13-01082-g015.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/07442976984a/nanomaterials-13-01082-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/3c13202128ac/nanomaterials-13-01082-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/b774b8e9f592/nanomaterials-13-01082-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/556bd17e9284/nanomaterials-13-01082-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/ca26102c82e4/nanomaterials-13-01082-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/9385f182d22e/nanomaterials-13-01082-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/db7aa57d68d1/nanomaterials-13-01082-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/730e02f284f2/nanomaterials-13-01082-g007.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/07442976984a/nanomaterials-13-01082-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/3c13202128ac/nanomaterials-13-01082-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/b774b8e9f592/nanomaterials-13-01082-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/d78309d8976f/nanomaterials-13-01082-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/0ca4de55f783/nanomaterials-13-01082-g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0690/10051765/1557d9fbab14/nanomaterials-13-01082-g015.jpg

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