Synthesis and characterization of Cu(OH)2-NWs-PVA-AC Nano-composite and its use as an efficient adsorbent for removal of methylene blue

Abstract

The present study focused on the synthesis of copper hydroxide nanowires decorated on activated carbon (Cu(OH)2-NWs-PVA-AC). The obtained Cu(OH)2-NWs-PVA-AC Nano-composite was distinguished by XRD, SEM, EDX, BET, FTIR and XPS respectively. Besides, different variables such as solution pH, and initial dye concentration, contact time, and temperature were performed on the adsorption efficiency of MB in a small batch reactor. Further, the experimental results are analyzed by various kinetic models via PFO, PSO, intra-particle diffusion and Elovich models, and the results revealed that among the kinetic models, PSO shows more suitability. In addition, different adsorption isotherms were applied to the obtained experimental data and found that Langmuir–Freundlich and Langmuir isotherm were best fits with the maximum adsorption capacity of 139.9 and 107.6 mg/g, respectively. The Nano-composite has outstanding MB removal efficiency of 94–98.5% with a span of 10 min. and decent adsorption of about 98.5% at a pH of 10. Thermodynamic constants like Gibbs free energy, entropy, and enthalpy were analyzed from the temperature reliance. The results reveal the adsorption processes are spontaneous and exothermic in nature. The high negative value of ΔG° (− 44.11 to − 48.86 kJ/mol) and a low negative value of ΔH° (− 28.96 kJ/mol) show the feasibility and exothermic nature of the adsorption process. The synthesized dye was found to be an efficient adsorbent for the potential removal of cationic dye (methylene blue) from wastewater within a short time.

Decomposition of Nitrous Oxide using a Copper‐supported Shirasu Catalyst

“…Otherwise, Cu(II)[NH 3 ] 3 /A3NN, and Cu(II)[NH 3 ] 3 /A2NN were 20.0 and 20.1 m 2 g −1 , respectively, and copper supported A3NN and A2NN catalysts possessed significantly high specific surface areas compared with the pristine samples (A3NN: 2.8 m 2 g −1 , A2NN: 0.7 m 2 g −1 ). According to the reported simple model of decomposition of N 2 O on the active copper species, the reaction pass ways can be described as follows: [42] $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {\rm Cu}({\rm I})+{\rm N}{_{2}}{\rm O}\rightarrow {\rm Cu}({\rm II}){\rm O}{^{- }}+{\rm N}{_{2}}\hfill\cr}}$$$ $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {\rm Cu}({\rm II}){\rm O}\hbox{-}+{\rm N}{_{2}}{\rm O}\rightarrow {\rm Cu}({\rm I})+{\rm O}{_{2}}+{\rm N}{_{2}}\hfill\cr}}$$$ $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {\rm 2Cu}({\rm II}){\rm O}{^{- }}\rightarrow {\rm 2Cu}({\rm I})+{\rm O}{_{2}}\hfill\cr}}$$$ …”

Agave-Angustifolia-like Cu3Mo2O9 Nanoplate-Coated Copper Mesh for Effective Emulsion Separation and Photocatalytic Degradation of Soluble Dyes

“…The alkaline chemically oxidized copper mesh exhibited two characteristic peaks, one at 679 cm −1 , which may be attributed to the bending vibration of the OH group, and the other at 938 cm −1 , which could be assigned to the C−O stretching vibration corresponding to the metal cation (Cu 2+ ). 36,37 The in situ transformation of Cu(OH) 2 nanowire needle arrays to the copper molybdate precursor (Cu 3 (MoO 4 ) 2 (OH) 2 ) presented prominent absorption peak bands at 962, 933, 917, 863, and 776 cm −1 . Compared with the Cu 3 Mo 2 O 9 @CM membrane, there was a major change in appearance of peaks in the range of 1000−500 cm −1 .…”

Application of Taguchi method and response surface methodology into the removal of malachite green and auramine-O by NaX nanozeolites

“…Pollution of water resources has become an economic problem since industrial factories have been increasing and water resources are limited 1 , 2 . Numerous industries, such as textiles, pharmaceuticals, and papermaking, produce large volumes of dye effluents.…”