摘要
Owing to outstanding hydrophilicity and ionic interaction,layered double hydroxides(LDHs)have emerged as a promising carrier for high performance catalysts.However,the synthesis of new specialized catalytic LDHs for degradation of antibiotics still faces some challenges.In this study,a CoFe_(2)O_(4)/MgAl-LDH composite catalyst was synthesized using a hydrothermal coprecipitation method.Comprehensive characterization reveals that the surface of MgAl-LDH is covered with nanometer CoFe_(2)O_(4) particles.The specific surface area of CoFe_(2)O_(4)/MgAl-LDH is 82.84 m^(2)·g^(-)1,which is 2.34 times that of CoFe_(2)O_(4).CoFe_(2)O_(4)/MgAl-LDH has a saturation magnetic strength of 22.24 A·m^(2)·kg^(-1) facilitating efficient solid-liquid separation.The composite catalyst was employed to activate peroxymonosulfate(PMS)for the efficient degradation of tetracycline hydrochloride(TCH).It is found that the catalytic performance of CoFe_(2)O_(4)/MgAl-LDH significantly exceeds that of CoFe_(2)O_(4).The maximum TCH removal reaches 98.2%under the optimal conditions([TCH]=25 mg/L,[PMS]=1.5 mmol/L,CoFe_(2)O_(4)/MgAl-LDH=0.20 g/L,pH 7,and T=25℃).Coexisting ions in the solution,such as SO_(4)^(2-),Cl-,H_(2)PO_(4)^(-),and CO_(3)^(2-),have a negligible effect on catalytic performance.Cyclic tests demonstrate that the catalytic performance of CoFe_(2)O_(4)/MgAl-LDH remains 67.2%after five cycles.Mechanism investigations suggest that O_(2)^(•-)and ^(1)O_(2) produced by CoFe_(2)O_(4)/MgAl-LDH play a critical role in the catalytic degradation.
层状双氢氧化物(LDH)具有优异的亲水性和离子相互作用,是一种很有前途的高性能催化剂载体。本研究采用简单的共沉淀水热法制备了CoFe_(2)O_(4)/MgAl-LDH复合催化剂。结果表明,纳米级CoFe_(2)O_(4)颗粒覆盖在MgAl-LDH表面;CoFe_(2)O_(4)/MgAl-LDH的比表面积为82.84 m^(2)·g^(-)1,是CoFe_(2)O_(4)的2.34倍;CoFe_(2)O_(4)/MgAl-LDH的饱和磁化强度为22.24 A·m^(2)·kg^(-1),可实现高效的固液分离。将催化剂用于活化过氧一硫酸盐(PMS)高效降解盐酸四环素(TCH),发现CoFe_(2)O_(4)/MgAl-LDH的催化性能明显优于CoFe_(2)O_(4)。在最佳条件下([TCH]=25 mg/L,[PMS]=1.5 mmol/L,CoFe_(2)O_(4)/MgAl-LDH=0.20 g/L,pH 7,T=25℃),TCH去除率最高可达98.2%;溶液中共存离子SO_(4)^(2-)、Cl^(-)、H_(2)PO_(4)^(-)和CO_(3)^(2-)对催化性能影响不大;而且经过5次循环后CoFe_(2)O_(4)/MgAl-LDH的催化性能仍保持在67.2%。机理研究发现,O_(2)^(·-)和1O_(2)在催化降解过程中起主导作用。
出处
《无机材料学报》
北大核心
2025年第4期440-448,I0022-I0024,共12页
Journal of Inorganic Materials
基金
University Synergy Innovation Program of Anhui Province(GXXT-2022-083)
Science and Technology Plan Project of Wuhu City,China(2023kx12)
Anhui Provincial Department of Education New Era Education Project(2023xscx070)。
作者简介
李建军(1975-),教授.E-mail:ljj.hero@126.com;Corresponding author:李建军,教授.E-mail:ljj.hero@126.com。
