A high-performance adsorbent of 2D Laponite in-situ coated on 3D diatomite for advanced adsorption of cationic dye  

作　　者：DAI Nan FENG Li ZHAO Li SONG Dan DAI XingJian LIU XiaoYing ZHANG YuXin 

机构地区：[1]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [2]Chongqing Academy of Eco-Environmental Sciences,Chongqing 401147,China [3]Engineering Research Center for Waste Oil Recovery Technology and Equipment,Chongqing Key Lab Catalysis&New Environment Materials,Ministry of Education,School of Environment and Resources,Chongqing Technology and Business University,Chongqing 400067,China

出　　处：《Science China(Technological Sciences)》2022年第10期2304-2316,共13页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 51908092);the Scientific Research Project of Chongqing Academy of Environmental Sciences (Grant No. 2021-014);the Project Supported Graduate Research and Innovation Foundation of Chongqing, China (Grant No. CYS21001);the Fundamental Research Funds for the Central Universities (Grant Nos. 2020CDJXZ001 and 2021CDJJMRH005);the Joint Funds of the National Natural Science Foundation of ChinaGuangdong (Grant No. U1801254);the Chongqing Special Postdoctoral Science Foundation (Grant No. XmT2018043);the Chongqing Research Program of Basic Research and Frontier Technology (Grant No. cstc2017jcyjBX0080);the Natural Science Foundation Project of Chongqing for Post-doctor (Grant Nos. cstc2019jcyjbsh0079 and cstc2019jcyjbshX0085);the Technological Projects of Chongqing Municipal Education Commission (Grant No. KJZDK201800801);the Innovative Research Team of Chongqing (Grant No. CXTDG201602014);the Innovative Technology of New Materials and Metallurgy (Grant No. 2019CDXYCL0031)

摘　　要：A one-step hydrothermal method was used to synthesize two-dimensional layered Laponite nanosheets(Laponite@diatomite)in situ on the three-dimensional biological template diatomite.The cationic dye removal ability of Laponite@diatomite with different diatomite content was studied.X-ray diffraction(XRD),scanning electron microscope(SEM),transmission electron microscope(TEM),Fourier transformed-infrared(FT-IR)spectroscopy,X-ray photoelectron spectroscopy(XPS),and N_(2) adsorption-desorption technology were used to characterize synthetic materials.The effects of pH,initial concentration,dynamics,and thermodynamics behavior on the adsorption performance were further studied.La@D-0.1 had the highest adsorption efficiency,and the adsorption rate of methylene blue(MB)solution(450 mg L^(−1))reached 76.7%in the initial 5 min.At the time of adsorption equilibrium(1 h),methylene blue adsorption rate reached 86.4%.The adsorption behavior of La@D-0.1 on MB was characterized by Langumuir isotherm and with better fitting to the quasi-second-order kinetic model curve.By calculating the adsorption process’s thermodynamic parameters,we were able to illustrate that the adsorption process was exothermic.This work provides a novel idea for the synthesis of an economical and ideal,cationic dye nano-adsorbent and provides a potential application for the purification of actual dye wastewater.

关 键 词：Laponite@diatomite composites methylene blue ADSORPTION ISOTHERM THERMODYNAMICS 

分 类 号：TQ424[化学工程] X703[环境科学与工程—环境工程]