Selective adsorption of tetracycline by β-CD-immobilized sodium alginate aerogel coupled with ultrafiltration for reclaimed water  

作　　者：Xi Quan Jun Zhang Linlin Yin Wei Zuo Yu Tian 

机构地区：[1]State Key Laboratory of Urban Water Resource and Environment(SKLUWRE),School of Environment,Harbin Institute of Technology,Harbin 150090,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第4期27-34,共8页中国化学工程学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(2022YFC3801101);National Natural Science Foundation of China(52170028);the State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology(2023DX11);National Engineering Research Center for Safe Sludge Disposal and Resource Recovery(2021A003).

摘　　要：In this work,a novel composite material based on β-cyclodextrin-immobilized sodium alginate aerogel(β-CD/NaAlg) was developed utilizing cross-linker of epichlorohydrin and applied as an adsorbent to remove tetracycline antibiotics from reclaimed wastewater.A series of characterizations were utilized to confirm the successful synthesis of the adsorbent and this β-CD/NaAlg presented a three-dimensional network at the nanoscale or microscale.Under optimal conditions(pH=4,t=8 h,β-CD:NaAlg=9,adsorbent dosage = 1.5 g·L-1),the maximum removal rate of β-CD/NaAlg to tetracycline was 70%.The adsorption behavior of tetracycline on β-CD/NaAlg conformed to the Freundlich isotherm model(R2=0.9977) and the pseudo-second-order kinetic model(R^(2)=0.9993).Moreover,the adsorbent still removed 55.3% of tetracycline after five cycles.Specially,the adsorbent was integrated with ultrafiltration to adsorb tetracycline antibiotics from simulated reclaimed wastewater,and the removal rate of tetracycline reached 78.9% within 2 h.The existence of Cr(Ⅵ) had a negligible impact on tetracycline removal,while the presence of humic acid exhibited a promoting effect.The possible adsorption mechanisms were also elucidated through X-ray photoelectron spectroscopy and density functional theory analysis.In summary,β-CD/NaAlg represents an environmentally friendly,efficient,and sustainable adsorbent for removing tetracycline antibiotics from reclaimed water.

关 键 词：b-CD/NaAlg aerogel Covalent grafting Tetracycline antibiotics ULTRAFILTRATION Selective adsorption Reclaimed water 

分 类 号：X703[环境科学与工程—环境工程] TQ424[化学工程]