椰壳活性炭对全氟辛酸的吸附研究

IF 1.6 Q4 ENVIRONMENTAL SCIENCES AIMS Environmental Science Pub Date : 2022-01-01 DOI:10.3934/environsci.20220010
P. Kanchanapiya, Supachai Songngam, T. Tantisattayakul
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引用次数: 1

摘要

全氟辛酸(PFOA)是全氟烷基和多氟烷基物质(PFAS)中的一种,由于其在环境中的全球分布、持久性、高生物蓄积性和毒性而日益引起人们的关注。研究去除污染水体中PFOA的有效方法具有重要意义。考察了泰国产商品椰壳活性炭对粉状活性炭(PAC-325)和颗粒状活性炭(GAC-20x50)的吸附动力学和等温线,探讨了其去除水中PFOA的可行性。吸附动力学结果表明,吸附剂粒径对PFOA的吸附速率有显著影响,GAC-20x50达到吸附平衡至少需要100 h,远远超过PAC-325的3 h。实验数据拟合了两个动力学模型,拟二阶模型较好地描述了PAC-325和GAC-20x50对PFOA的吸附。PAC-325对PFOA的吸附速度比GAC-20x50快,在最短的吸附时间(5分钟)下,PAC-325仍能有效去除PFOA(约80%)。Langmuir拟合结果表明,PAC-325的吸附量为0.80 mmol/g,比GAC-20x50的吸附量(0.13 mmol/g)提高了83%。
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The Adsorption of Perfluorooctanoic Acid on Coconut Shell Activated Carbons
Perfluorooctanoic acid (PFOA) is one of Per- and polyfluoroalkyl substances (PFAS) that have increasingly attracted concerns due to their global distribution in environment, persistence, high bioaccumulation and toxicity. It is important to study the effective treatment to remove PFOA from contaminated water. The feasibility of using commercial coconut shell activated carbon produced in Thailand to remove PFOA from water was investigated with regard to their adsorption kinetics and isotherms of powder activated carbon (PAC-325) and granular activated carbon (GAC-20x50). Adsorption kinetic results show that the adsorbent size significantly affected the adsorption rate of PFOA, and GAC-20x50 required at least 100 h to achieve the equilibrium, much longer than 3 h for PAC-325. Two kinetic models were fitted to the experimental data, and the pseudo-second-order model well described the adsorption of PFOA on both PAC-325 and GAC-20x50. PAC-325 trended to adsorb PFOA faster than GAC-20x50 and testing with the shortest adsorption times (5 min) still yielded substantial PFOA removal (~80% for PAC-325). The adsorption isotherms show that the adsorption capacity of PAC-325 was 0.80 mmol/g, which is 83 % higher than that for GAC-20x50 (0.13 mmol/g), according to the Langmuir fitting.
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来源期刊
AIMS Environmental Science
AIMS Environmental Science ENVIRONMENTAL SCIENCES-
CiteScore
2.90
自引率
0.00%
发文量
31
审稿时长
5 weeks
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