Optimisation and modeling of Organic Toxin elimination in waste water Based on Mesoporous GNS/NiO Nanocomposite

ABSTRACT

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 R²of (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 R²value 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.

KEYWORDS:

• Mesoporous (GNS/NiO) and NiO nanoparticles
• bromophenol blue (BPB)
• simultaneous removal
• response surface methodology (RSM)

Acknowledgments

Authors thank Egyptian Petroleum Research Institute staffs for kind support.

Authors contributions

All authors read and approved the final manuscript.

Disclosure statement

No potential conflict of interest was reported by the authors.

Ethical approval

This manuscript does not contain any studies with human participants or animals performed by any of the authors.

Informed consent

Informed consent was obtained from all individual participants included in the study.