LIN J, ZHANG Y D, ZHANG Q, et al.Study on adsorption and photocatalytic regeneration capability of Zn₃Cr-CO₃ LDH as adsorbent for removal of methyl orange[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(5):180-188.

doi:10.16186/j.cnki.1673-9787.2020100038

Received:2020/10/19

Revised:2021/01/07

Published:2022/09/25

Study on adsorption and photocatalytic regeneration capability of Zn₃Cr-CO₃ LDH as

adsorbent for removal of methyl orange

LIN Jia, ZHANG Yude, ZHANG Qian, SHANG Jinli, DENG Fuyao, DAI Mingyang

School of Chemistry and Chemical Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China

Abstract:In order to solve the problem of effective adsorption and green regeneration of hydrotalcite adsorbent，two kinds of transition metal elements of Zn and Cr were introduced into the laminate structure of hydrotalcite，and Zn₃Cr-CO₃LDH was prepared by co-precipitation method.The photocatalytic properties of Zn₃Cr-CO₃LDH was used to degrade the adsorbed organic pollutant molecules and realized the regeneration and recycling of the hydrotalcite.The microstructure，the influencing factors of adsorption property and regeneration cycle performance of Zn₃Cr-CO₃LDH were studied in detail.The results showed that Zn₃Cr-CO₃LDH had a hierarchical porous structure，a high specific surface area （113.7 m²/g），and the maximum adsorption capacity for methyl orange was 938.08 mg/g.Methyl orange exhibited multilayer adsorption on the Zn₃Cr-CO₃LDH surface through physical and chemical action，its adsorption behavior was consistent with Freundlich adsorption isotherm model and pseudo-second-order kinetic model.It was a spontaneous and endothermic process.The Zn₃Cr-CO₃LDH regenerated by photocatalytic could still maintain high adsorption efficiency during recycling.

Key words:ZnCr-COLDH;hierarchical porous;methyl orange;efficient adsorption;photocatalytic regeneration;recyclability

锌铬水滑石对甲基橙的吸附和光催化再生性能研究_林佳.pdf