From waste to waste treatment: Mesoporous magnetic NiFe2O4/ZnCuCr-layered double hydroxide composite for wastewater treatment

Rose Zhang, Bangwang Xia, Peipei Wang, Yi Wang, Zhidao Li, Youchen Wang, Lei Feng, Xiaona Li, Shangfeng Du

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11 Citations (Scopus)
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Abstract

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.
Original languageEnglish
Article number153053
JournalJournal of Alloys and Compounds
Volume819
DOIs
Publication statusPublished - 15 Nov 2019

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