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Characteristic and mechanism of sorption and desorption of benzene on humic acid.
Environ Sci Pollut Res Int. 2019 Jul; 26(20):20277-20285.ES

Abstract

The sorption/desorption behaviors of benzene, toluene, ethylbenzene, and xylene (BTEX) on soil organic matter (SOM) have a significant influence on their fate and bioavailability in soil. Humic acid (HA) is a major fraction of SOM. And due to its various structural properties and chemical composition, the sorption/desorption characteristics and mechanisms of HA are diverse for organic contaminants. In this study, batch experiments were conducted to investigate the sorption/desorption behavior of benzene on HA at different conditions (temperature, pH, and ionic strength). The particle size of HA increased at lower initial pH which promoted sorption capacity for benzene, illustrating that HA with larger particle size may develop preferential chemical conformation for benzene sorption at lower pH. Sorption isotherms indicated that the sorption of benzene on HA is an exothermic and spontaneous physical process. And kinetic studies showed that the sorption of benzene on HA is controlled by the diffusion process and the availability of sorption sites. Meanwhile, weak sorbent-sorbate interaction is presented in the desorption experiment. There was no obvious effect of ionic strength on benzene sorption, suggesting that the sorption process is not controlled by ion-exchange or electrostatic interaction. Combined with FTIR analysis, the hydrophobic partitioning and π-π conjugative interaction are the possible sorption mechanisms of benzene on HA.

Authors+Show Affiliations

School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China. yl.li@cug.edu.cn.School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China.School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31098910

Citation

Tang, Zhi, et al. "Characteristic and Mechanism of Sorption and Desorption of Benzene On Humic Acid." Environmental Science and Pollution Research International, vol. 26, no. 20, 2019, pp. 20277-20285.
Tang Z, Li Y, Yang Z, et al. Characteristic and mechanism of sorption and desorption of benzene on humic acid. Environ Sci Pollut Res Int. 2019;26(20):20277-20285.
Tang, Z., Li, Y., Yang, Z., Liu, D., Tang, M., Yang, S., & Tang, Y. (2019). Characteristic and mechanism of sorption and desorption of benzene on humic acid. Environmental Science and Pollution Research International, 26(20), 20277-20285. https://doi.org/10.1007/s11356-019-05095-0
Tang Z, et al. Characteristic and Mechanism of Sorption and Desorption of Benzene On Humic Acid. Environ Sci Pollut Res Int. 2019;26(20):20277-20285. PubMed PMID: 31098910.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Characteristic and mechanism of sorption and desorption of benzene on humic acid. AU - Tang,Zhi, AU - Li,Yilian, AU - Yang,Zhe, AU - Liu,Danqing, AU - Tang,Min, AU - Yang,Sen, AU - Tang,Ye, Y1 - 2019/05/16/ PY - 2018/12/13/received PY - 2019/04/04/accepted PY - 2019/5/18/pubmed PY - 2019/8/31/medline PY - 2019/5/18/entrez KW - Benzene KW - Characteristic KW - Desorption KW - Humic acid KW - Mechanism KW - Sorption SP - 20277 EP - 20285 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 26 IS - 20 N2 - The sorption/desorption behaviors of benzene, toluene, ethylbenzene, and xylene (BTEX) on soil organic matter (SOM) have a significant influence on their fate and bioavailability in soil. Humic acid (HA) is a major fraction of SOM. And due to its various structural properties and chemical composition, the sorption/desorption characteristics and mechanisms of HA are diverse for organic contaminants. In this study, batch experiments were conducted to investigate the sorption/desorption behavior of benzene on HA at different conditions (temperature, pH, and ionic strength). The particle size of HA increased at lower initial pH which promoted sorption capacity for benzene, illustrating that HA with larger particle size may develop preferential chemical conformation for benzene sorption at lower pH. Sorption isotherms indicated that the sorption of benzene on HA is an exothermic and spontaneous physical process. And kinetic studies showed that the sorption of benzene on HA is controlled by the diffusion process and the availability of sorption sites. Meanwhile, weak sorbent-sorbate interaction is presented in the desorption experiment. There was no obvious effect of ionic strength on benzene sorption, suggesting that the sorption process is not controlled by ion-exchange or electrostatic interaction. Combined with FTIR analysis, the hydrophobic partitioning and π-π conjugative interaction are the possible sorption mechanisms of benzene on HA. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/31098910/Characteristic_and_mechanism_of_sorption_and_desorption_of_benzene_on_humic_acid_ L2 - https://dx.doi.org/10.1007/s11356-019-05095-0 DB - PRIME DP - Unbound Medicine ER -