Effect of cations on monochlorobenzene adsorption onto bentonite at the coexistence of Tween 80.
In: Journal of Hazardous Materials, Jg. 469 (2024-05-05), S. N.PAG
academicJournal
Zugriff:
The effect of several prevalent cations (including Na+, K+, Mg2+, Ca2+, Al3+, and Fe3+) on the adsorption of monochlorobenzene (MCB) onto bentonite was investigated at the coexistence of nonionic surfactant Tween 80 (T80) in surfactant-enhanced remediation (SER). They are all favorable for MCB and T80 adsorption, especially Mg2+ and Ca2+. Adsorption of MCB is strongly depended on T80 micelles. When its concentration exceeds the solubility, MCB is easier to bind with T80 micelles and be adsorbed by bentonite. Acidic environment can facilitate MCB and T80 adsorption, but the effect of cations on the adsorption is most significant under alkaline conditions. Adsorption capacity of MCB increases first followed by a slight decrease with increasing cations concentrations. The maximum adsorption rate of MCB determined is about 68.4% in a solution containing Mg2+ in the isothermal adsorption of MCB, while it is only 6.8% in a cation-free solution. Various characterizations showed that cations mainly changed the repulsion between bentonite particles and T80 micelles and the agglomeration and structure of bentonite, thus affecting the adsorption of MCB and T80 micelles. Our research demonstrated the nonnegligible promotion of MCB adsorption on bentonite by cations and acidic environment, which will adversely affect SER efficiency. [Display omitted] • Cations mainly promote the adsorption of T80 micelles rather than T80 monomers. • The higher the MCB dosage, the greater its adsorption rate in cations solutions. • MCB above its solubility is easier to bind with T80 and be adsorbed by bentonite. • T80 makes the zeta potential of bentonite particles rise and morphology smooth. • The particle size of bentonite decreases at higher cation concentrations. [ABSTRACT FROM AUTHOR]
Titel: |
Effect of cations on monochlorobenzene adsorption onto bentonite at the coexistence of Tween 80.
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Autor/in / Beteiligte Person: | Xu, Changzhong ; Ning, Yu ; Wang, Changxiang ; Yang, Sen ; Yang, Zhe ; Li, Yilian |
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Zeitschrift: | Journal of Hazardous Materials, Jg. 469 (2024-05-05), S. N.PAG |
Veröffentlichung: | 2024 |
Medientyp: | academicJournal |
ISSN: | 0304-3894 (print) |
DOI: | 10.1016/j.jhazmat.2024.133883 |
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