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

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Abstract

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 N2 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.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Nan Dai, XingJian Dai & YuXin Zhang

  2. Chongqing Academy of Eco-Environmental Sciences, Chongqing, 401147, China

    Li Feng, Li Zhao & Dan Song

  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

    XiaoYing Liu

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  1. Nan Dai
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  2. Li Feng
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  3. Li Zhao
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  4. Dan Song
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  5. XingJian Dai
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  6. XiaoYing Liu
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  7. YuXin Zhang
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Corresponding author

Correspondence to YuXin Zhang.

Additional information

This work was 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 2021CDJJMRH-005), the Joint Funds of the National Natural Science Foundation of China-Guangdong (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), and the Innovative Technology of New Materials and Metallurgy (Grant No. 2019CDXYCL0031). The authors also thank the Electron Microscopy Center of Chongqing University for Materials Characterizations.

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Dai, N., Feng, L., Zhao, L. et al. A high-performance adsorbent of 2D Laponite in-situ coated on 3D diatomite for advanced adsorption of cationic dye. Sci. China Technol. Sci. 65, 2304–2316 (2022). https://doi.org/10.1007/s11431-021-1998-y

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  • DOI: https://doi.org/10.1007/s11431-021-1998-y

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