Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 819, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.153053
Keywords
Adsorption; Congo red; LDH; NiFe2O4; Wastewater
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Funding
- Postgraduate Demonstration Course Construction Project of the Hebei Provincial Department of Education of China
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Mesoporous magnetic NiFe2O4/ZnCuCr-LDH composite is synthesized by an environmental-friendly hydrothermal process from saccharin wastewater to achieve the goal of treating the wastes with wastes. During this process, all waste iron-catalyst and 82% of chemical oxygen demand (CODcr) are removed from the wastewater. The composite is characterized by FT-IR, XRD, SEM, EDS, TEM, XPS, BET, and VSM analyses and its potential for wastewater treatment is evaluated by Congo Red (CR) adsorption. An over 97% removal efficiency is achieved with an initial CR concentration ranging from 100-450 mg/L. The adsorption kinetic is investigated and it is found that the experimental data agrees well with the pseudo-second-order kinetic model, intra-particle diffusion and Langmuir adsorption isotherm model. Adsorption isotherm indicates a spontaneous and endothermic adsorption type. The adsorption mechanism is also explored and the important roles of electrostatic attraction and anion exchange are demonstrated. (C) 2019 Elsevier B.V. All rights reserved.
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