Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 350, Issue -, Pages 1-9Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.02.014
Keywords
Advanced oxidation; Microwave degradation; Natural minerals; Nickel ferrite; Organic pollutant
Categories
Funding
- Science Research Plan Project of Education Department of Liaoning Province of China [L2015205]
- Natural Science Foundation of Science and Technology Department of Liaoning Province of China [201602346]
- Shenyang Municipal Science and Technology Plan Project of China [F16-205-1-06]
- Environmental Science Key Discipline Project of Liaoning Province Education Department
- Liaoning University of China
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In this study, novel spinel-NiFe2O4/natural mineral (sepiolite, diatomite and kaolinite) composites were developed using microwave (MW) hydrothermal method, and applied in MW-induced catalytic degradation (NiFe2O4/natural mineral/MW) of organic pollutants such as sodium dodecyl benzene sulfonate (SDBS), azo fuchsine (AF), methyl parathion (MP), and crystal violet (CVL) in solution. Catalytic activities of three NiFe2O4/natural mineral composites were compared. The effects of material synthesis process parameters such as molar ratios of NiFe2O4 and natural mineral, and pH of precursor solutions for synthesizing catalysts, and degradation parameters such as MW irradiation time and catalyst reuse cycles were also investigated. The principle on NiFe2O4/natural mineral/MW degradation was provided. The results reveal that organic pollutants in waste-water can be removed completely using NiFe2O4/natural mineral/MW within minutes. NiFe2O4/sepiolite shows higher catalytic activity than the others. The calculated degradation rate constants are 1.865, 0.672, 0.472, and 0.329 min(-1) for SDBS, AF, MP, and CVL, respectively, using NiFe2O4/sepiolite/MW system. The performance of NiFe2O4/natural mineral can be maintained for three reuse cycles. Active species center dot OH, center dot O-2(-), and h(+) play main roles in NiFe2O4/sepiolite/MW degradation. Hence, NiFe2O4/sepiolite/MW technology with rapid and cost-effective degradation, magnetic separation, and no secondary pollution, demonstrates to be promising in treating organic contaminants in wastewater.
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