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Synthesis and characterization of antibacterial chromium iron oxide nanoparticle‐loaded activated carbon for ultrasound‐assisted wastewater treatment
Author(s) -
Bazrafshan Ali Akbar,
Hajati Shaaker,
Ghaedi Mehrorang,
Asfaram Arash
Publication year - 2018
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.3981
Subject(s) - chemistry , adsorption , freundlich equation , nuclear chemistry , activated carbon , langmuir , chemisorption , sorption , langmuir adsorption model , antibacterial activity , response surface methodology , chromatography , organic chemistry , bacteria , biology , genetics
The aim of this study was to evaluate the surface adsorption capacity of CrFeO 3 nanoparticle‐loaded activated carbon (CrFeO 3 ‐NPs–AC) for the removal of a cationic dye (methyl violet, MV). CrFeO 3 ‐NPs were hydrothermally synthesized and loaded on AC followed by characterization using X‐ray diffraction, field‐emission scanning electron microscopy and energy‐dispersive and Fourier transform infrared spectroscopies. The CrFeO 3 ‐NPs were tested for in vitro antibacterial activities against Gram‐positive ( Staphylococcus aureus ) and Gram‐negative ( Pseudomonas aeruginosa ) bacteria. Minimum inhibitory and minimum bactericidal concentrations of CrFeO 3 ‐NPs–AC were obtained to be 50 and 100 μg ml −1 , respectively, against S. aureus and 25 and 50 μg ml −1 against P. aeruginosa . These results indicated the antibacterial properties of CrFeO 3 ‐NPs–AC. To investigate the adsorption process, several systematic experiments were designed by varying parameters such as adsorbent mass, pH, initial MV concentration and sonication time. The adsorption process was modelled and the optimal conditions were determined to be 0.013 g, 7.4, 15 mg l −1 and 8 min for adsorbent mass, pH, MV concentration and sonication time, respectively. The real experimental data were found to be efficiently explained by response surface methodology and genetic algorithm model. Kinetic studies for MV adsorption showed rapid sorption dynamics described by a second‐order kinetic model, suggesting a chemisorption mechanism. Then, the experimental equilibrium data obtained at various concentrations of MV and adsorbent masses were fitted to conventional Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherm models. Dye adsorption equilibrium data were fitted well to the Langmuir isotherm. From the Langmuir model, the maximum monolayer capacity was calculated to be 65.67 mg g −1 at optimum adsorbent mass.