Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2021 Mar 11;11(1):5686.
doi: 10.1038/s41598-021-84797-3.

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

Sivarama Krishna Lakkaboyana  1   2 , Khantong Soontarapa  3   4 , Nabel Kalel Asmel  5 , Vinay Kumar  6 , Ravi Kumar Marella  7 , Ali Yuzir  8 , Wan Zuhairi Wan Yaacob  9
Affiliations

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

Sivarama Krishna Lakkaboyana et al. Sci Rep. .

Erratum in

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.

PubMed Disclaimer

Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
XRD patterns of Cu(OH)2-NWs, and Cu(OH)2-NWs-PVA-AC Nano-composite.
Figure 2
Figure 2
SEM images of (a) Cu(OH)2-NWs, and (b) Cu(OH)2-NWs-PVA-AC Nano-composite.
Figure 3
Figure 3
(a) SEM–EDS spectra of the Cu(OH)2-NWs, (b) SEM–EDS spectra of the Cu(OH)2-NWs-PVA-AC Nano-composite.
Figure 4
Figure 4
(a) N2 adsorption/desorption isotherms. (b) Pore size distribution and pore volume of raw Cu(OH)2-NWs-PVA-AC.
Figure 5
Figure 5
FTIR patterns of Cu(OH)2-NWs, and Cu(OH)2-NWs-PVA-AC Nano-composite.
Figure 6
Figure 6
Effect of pH. Conditions: MB concentration: 50 mg/L; Volume = 25 mL, Absorbent dose = 30 mg; Temp. = 30 ± 10 °C; Speed of agitation = 200 rpm; Contact time = 60 min.
Figure 7
Figure 7
Effect of dye concentration and contact time on MB. Conditions: MB concentration: 10, 20 and 30 mg/L; Volume = 25 mL, Absorbent dose = 30 mg; Temp. = 30 ± 10 °C; Speed of agitation = 200 rpm; Contact time = 60 min.
Figure 8
Figure 8
Pseudo-first-order, Pseudo-second-order, and Elovich, models kinetics plots for different concentration: (a) 10 mg/L, (b) 20 mg/L, (c) 30 mg/L. Conditions: As shown in Fig. 7.
Figure 9
Figure 9
Adsorption Intraparticle diffusion model for adsorption of MB onto Cu(OH)2-NWs-PVA-AC Nano-composite. Conditions: As shown in Fig. 7.
Figure 10
Figure 10
Langmuir, Freundlich, Langmuir–Freundlich, Temkin, and Redlich adsorption isotherms at different temperatures (a) 35 °C, (b) 45 °C and (c) 55 °C) for the adsorption of MB onto Cu(OH)2-NWs-PVA-AC Nano-composite. Conditions: MB concentration: 60, 80 and 100 mg/L; Volume = 25 mL, Absorbent dose = 30 mg; Temp. = 35, 45, and 55 °C; Speed of agitation = 200 rpm; Contact time = 60 min.
Figure 11
Figure 11
Thermodynamic parameter for MB adsorption onto Cu(OH)2-NWs-PVA-AC Nano-composite. Conditions: As shown in Fig. 10.
Figure 12
Figure 12
Desorption of MB onto Cu (OH)2-NWs-PVA-AC.
See this image and copyright information in PMC

References

    1. Reddy MCS, Sivaramakrishna L, Reddy AV. The use of an agricultural waste material, Jujuba seeds for the removal of anionic dye (Congo red) from aqueous medium. J. Hazard Mater. 2012;203:118–127. doi: 10.1016/j.jhazmat.2011.11.083. - DOI - PubMed
    1. Bhatt AS, et al. Adsorption of an anionic dye from aqueous medium by organoclays: Equilibrium modeling, kinetic and thermodynamic exploration. RSC Adv. 2012;2:8663–8671. doi: 10.1039/c2ra20347b. - DOI
    1. Alam MK, et al. Ultra-sensitive 2-nitrophenol detection based on reduced graphene oxide/ZnO nanocomposites. J. Electroanal. Chem. 2017;788:66–73. doi: 10.1016/j.jelechem.2017.02.004. - DOI
    1. Awual MR, et al. Facile mercury detection and removal from aqueous media involving ligand impregnated conjugate nanomaterials. Chem. Eng. J. 2016;290:243–251. doi: 10.1016/j.cej.2016.01.038. - DOI
    1. Lakkaboyana SK, Khantong S, Asmel NK, Yuzir A, Wan-Yaacob WZ. Synthesis of copper oxide nanowires-activated carbon (AC@CuO-NWs) and applied for removal methylene blue from aqueous solution: Kinetics, isotherms, and thermodynamics. J. Inorg. Organometall. Polym. Mater. 2019;29:1658–1668. doi: 10.1007/s10904-019-01128-w. - DOI

LinkOut - more resources