Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 510, Issue -, Pages 207-220Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.09.066
Keywords
MnO2; MMt; Degradation; Nanocomposites
Categories
Funding
- National Natural Science Foundation of China [21576034, 41672292, 51604044]
- Chongqing University [CYB16014, CYB16029, CYB17046]
- Innovative Research Team of Chongqing [CXTDG201602014]
- Chongqing Science and Technology Commission [cstc2015jcyjA90011]
- State Key Laboratory of Coal Mine Disaster Dynamics and Control [2011DA105287-FW201504]
- Fundamental Research Funds for the Central Universities [106112017CDJQJ138802, 106112016CDJZR245518, 106112016CDJZR135506]
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In this research, MnO2 nanosheets on montmorillonite (MnO2 nanosheets@MMt) was synthesized by one pot hydrothermal method and characterized by X-ray diffraction, Fourier transform infrared spectra, nitrogen adsorption and scanning electron microscopy. It was found that honeycomb-like MnO2 nanosheets vertically grew on the surface of montmorillonite. MnO2 nanosheets@MMt exhibited high methylene blue (MB) removal rate, which reached 97.7% within 5 min under the condition of pH 2, MnO2 nanosheets dosage of 0.1 g L-1 and initial dye concentration of 10 mg L-1. Additionally, the influencing factors such as pH value, amount of MnO2 nanosheets@MMt, and MB concentration were also investigated in this paper. Results showed the MB degradation process was correlated with pH value, and the MnO2 nanosheets@MMt achieved MB removal rate of 92.8% within 5 min under pH 11 because of its absorption capacity of MB. The kinetics of the adsorption process complied with the Pseudo-second-order model. The Langmuir model was found to be the most suitable for describing the experimental equilibrium data of MnO2 nanosheets@MMt. The MnO2 nanosheets@MMt showed high adsorption capacity of 363.63 mg g(-1) for MB dye. The oxidative decomposition of MB was conducted in the presence of MnO2 nanosheets@MMt in the low pH, finding that the lower the pH was, the faster the degradation rate was. This research demonstrates that MnO2 nanosheets@MMt has potential applications in wastewater treatment. (C) 2017 Elsevier Inc. All rights reserved.
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