Journal
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
Volume 103, Issue 11, Pages 2445-2463Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/03067319.2021.1893707
Keywords
Mesoporous (GNS; NiO) and NiO nanoparticles; bromophenol blue (BPB); simultaneous removal; response surface methodology (RSM)
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This study optimized the removal of the BPB dye from aqueous solutions using NiO nanoparticles and mesoporous graphene nano sheets/NiO nanocomposite. The maximum removal efficiency reached 61.5% and 83.5% for NiO and GNS/NiO, respectively. The research indicates the high adsorption capacity and stability of the method.
This study, optimise the elimination of Bromophenol blue (BPB) dye from aqueous solutions using NiO nanoparticles and mesoporous graphene nano sheets/NiO(GNS/NiO) nanocomposite.Co-precipitation and hydrothermal methods were used to prepare both adsorbents. The structural properties have been analysed using X-ray diffraction, FTIR spectroscopy, DLS, TGA, SEMin addition to TEM investigations. The influence of adsorption factors as well as potential of hydrogen (2-12), sorbent amount (0.015-0.035 g/0.03 L) has been optimised using response surface methodology based on central composite design RSM/CCD.Also time (20-120 min), dye concentration (10-100 mg/L), beside temperature (298-339 K) was investigated. The optimum removal efficiency of Bromophenol blue (BPB) dye at 298 K reached to 61.5% and 83.5% at potential of hydrogen = 7 and catalyst dosage = 0.03 g/0.03 L for both adsorbents NiO and GNS/NiO, respectively. The pseudo-2(nd)-order model efficiently discusses sorption kinetics with a better correlation coefficient value R(2)of (0.98 and 0.994) for NiO and GNS/NiO, respectively, indicating chemisorption. Both of Langmuir and Freundlich models could precisely explain adsorption isotherm with R(2)value more than 0.9 indicating monolayer sorption in a homogenous manner. Thermodynamic factors indicate that BPB sorption was endothermic and spontaneous processes by both sorbents and maximum capacity reached to 90 and 95 mg/g for both NiO and GNS/NiO, respectively, at 339 K.
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