Waste plastic-derived NiO-MWCNT composite as visible light photocatalyst for degradation of methylene blue dye
Open accessAbstract
Low-cost and visible light photocatalysts are essential to achieve industrial-scale photocatalysis. Towards this goal, waste-derived preparation of nanophotocatalysts can be an important direction. Herein, we report waste-derived preparation of nickel oxide–multiwall carbon nanotube (NiO-MWCNT) and its application for visible light photocatalysis to degrade methylene blue (MB) dye. NiO nanoparticle (size ~ 4 nm) was prepared by the coprecipitation method. NiO-MWCNT composite was prepared by thermocatalytic pyrolysis using NiO nanoparticle and high-density polyethylene (HDPE) waste plastic. The average length and diameter of MWCNT were found to be ~ 300 nm and 66 nm, respectively. The NiO-MWCNT composite photocatalyst is found to have a band gap of 3.02 eV along with characteristic CNTs X-ray diffraction (XRD) peak (26.12°), Raman D, G peaks. The decolorization% of MB dye is achieved up to 92.4% using NiO-MWCNT catalyst under 28 W light-emitting diode (LED) visible light within 1 h. The decolorization% for 1 Sun equivalent light exposure is found to be 87.45% within 1 h. A degradation pathway of MB dye has been proposed based on the ESI–MS data leading to the formation of different intermediate fragments of m/z 214, 193, 186, 167, 158, 150, 141, 125, 114, 109, and 102. The study will generate momentum in solar-based industrial-scale photocatalysis for pollutant management and other solar-based chemical transformations.
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Catalytic carbonization of high-density polyethylene in a quartz tube furnace at 773 K for 3 h produces carbon nanotubes (Nath et al., 2021).
“| Catalytic carboni- | High-density | Quartz tube | 773 K, 3 h | Carbon nanotubes - | Nath et al. (2021) | |”
From Conversion of waste plastics into value-added carbon materials (2023) · cites this paper as Nath et al. (2021)
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Plastic wastes derived carbon materials for green energy and sustainable environmental applications
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- Authors
- Nath, A., Shah, A., Singh, L. R., & Mahato, M.
- Affiliations
- North Eastern Hill University (IN)
- Corresponding author
- Mahato, Mrityunjoy
- Venue
- Nanotechnology for Environmental Engineering
- Published
- 2021-10-31
- Volume
- 6
- Issue
- 3
- ISSN
- 2365-6379 (ISSN-L)
- 2365-6387
- OpenAlex
- W3208267767
- Cited by
- 43
- References
- 70
- Citations by year
- 2026: 5 · 2025: 12 · 2024: 7 · 2023: 9 · 2022: 10
- FWCI
- 1.22
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Nanotechnology for Environmental Engineering (publishedVersion, cc-by)
- Funders
- Science and Engineering Research Board (EMR/2016/002634, EMR/2016/004219)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
- Physical Sciences › Chemistry › Organic Chemistry › Nanomaterials for catalytic reactions
- Keywords
- nickel oxide nanoparticles, multi-walled carbon nanotubes, visible light photocatalysis, methylene blue degradation, dye decolorization, plastic waste valorization, high-density polyethylene, co-precipitation synthesis, band gap, degradation intermediates
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