Journal
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
Volume 65, Issue 10, Pages 2304-2316Publisher
SCIENCE PRESS
DOI: 10.1007/s11431-021-1998-y
Keywords
Laponite@diatomite composites; methylene blue; adsorption; isotherm; thermodynamics
Funding
- National Natural Science Foundation of China [51908092]
- Scientific Research Project of Chongqing Academy of Environmental Sciences [2021-014]
- Project Supported Graduate Research and Innovation Foundation of Chongqing, China [CYS21001]
- Fundamental Research Funds for the Central Universities [2020CDJXZ001, 2021CDJJMRH005]
- National Natural Science Foundation of ChinaGuangdong [U1801254]
- Chongqing Special Postdoctoral Science Foundation [XmT2018043]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2017jcyjBX0080]
- Natural Science Foundation Project of Chongqing for Post-doctor [cstc2019jcyjbsh0079, cstc2019jcyjbshX0085]
- Technological Projects of Chongqing Municipal Education Commission [KJZDK201800801]
- Innovative Research Team of Chongqing [CXTDG201602014]
- Innovative Technology of New Materials and Metallurgy [2019CDXYCL0031]
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In this study, a one-step hydrothermal method was used to synthesize two-dimensional layered Laponite nanosheets on the three-dimensional biological template diatomite. The adsorption performance of the synthesized Laponite@diatomite nano-adsorbent for cationic dye removal was investigated. The results showed that La@D-0.1 had the highest adsorption efficiency and exhibited excellent adsorption capability for methylene blue solution. This work provides a novel idea for the synthesis of an economical and ideal nano-adsorbent for cationic dyes and its potential application in wastewater purification.
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.
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