title: Enhanced removal of bisphenol-AF by activated carbon-alginate beads with cetyltrimethyl ammonium bromide.
abstract: Adsorption removal of bisphenol-AF (BPAF) from aqueous solutions by synthesized activated carbon-alginate beads (AC-AB) with cetyltrimethyl ammonium bromide (CTAB) has been studied using two ways. The traditional method (two-step) first synthesized CTAB-modified AC-AB (AC-AB-CTAB), then used it to remove BPAF by adsorption. And one-step method dispersed AC-AB and CTAB in wastewater, followed by the removal of BPAF accompanied with the synthesis of AC-AB-CTAB. The one-step method showed a better performance than the two-step method, achieving a maximum removal of BPAF with 284.6mg/g. Kinetic studies and adsorption isotherms indicated that adsorption process of BPAF on AC-AB by the one-step method could be expressed by a pseudo-second-order model and a Dubinin-Ashtakhov (D-A) isotherm, respectively. The effects of pH, ionic strength, and inorganic ions on BPAF adsorption were also investigated. Furthermore, hydrophobic interactions, hydrogen bonds, and π-π electron donor-acceptor (EDA) interactions were discussed to explain the enhanced adsorption behavior of BPAF on AC-AB with CTAB. The findings verified the effectiveness of AC-AB for the removal of BPAF from wastewater and its high stability within five regeneration cycles.
authors.affiliation: School of Resources and Environmental Science, Wuhan University, Wuhan 430079, PR China; Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, PR China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Tang
authors.affiliation: School of Resources and Environmental Science, Wuhan University, Wuhan 430079, PR China; Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, PR China.
authors.forename: Sha
authors.initials: S
authors.lastname: Peng
authors.affiliation: School of Resources and Environmental Science, Wuhan University, Wuhan 430079, PR China; Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, PR China.
authors.forename: Shuya
authors.initials: S
authors.lastname: Hu
authors.affiliation: School of Resources and Environmental Science, Wuhan University, Wuhan 430079, PR China; Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, PR China. Electronic address: songhongpku@126.com.
authors.forename: Song
authors.initials: S
authors.lastname: Hong
keywords: Activated carbon; Adsorption; Alginate; Bisphenol-AF (BPAF); Cetyltrimethyl ammonium bromide (CTAB)