Tang Zheng, Peng Sha, Hu Shuya, Hong Song
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.
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.
J Colloid Interface Sci. 2017 Jun 1;495:191-199. doi: 10.1016/j.jcis.2017.01.103. Epub 2017 Jan 31.
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.
采用两种方法研究了用合成的十六烷基三甲基溴化铵（CTAB）修饰的活性炭-海藻酸钠珠（AC-AB）从水溶液中吸附去除双酚AF（BPAF）。传统方法（两步法）首先合成CTAB修饰的AC-AB（AC-AB-CTAB），然后用其通过吸附去除BPAF。一步法是将AC-AB和CTAB分散在废水中，随后在合成AC-AB-CTAB的同时去除BPAF。一步法表现出比两步法更好的性能，BPAF的最大去除量达到284.6mg/g。动力学研究和吸附等温线表明，一步法中BPAF在AC-AB上的吸附过程分别可以用拟二级模型和杜宾宁-阿斯塔霍夫（D-A）等温线来描述。还研究了pH、离子强度和无机离子对BPAF吸附的影响。此外，讨论了疏水相互作用、氢键和π-π电子供体-受体（EDA）相互作用，以解释BPAF在含CTAB的AC-AB上增强的吸附行为。研究结果证实了AC-AB对废水中BPAF的去除效果及其在五个再生循环内的高稳定性。
