Waste plastic-derived NiO-MWCNT composite as visible light photocatalyst for degradation of methylene blue dye

Nath, Abhijit; Shah, Aunggat; Singh, L. Robindro; Mahato, Mrityunjoy

doi:10.1007/s41204-021-00163-8

Cited by 25 publications

(8 citation statements)

References 67 publications

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“…UV–vis absorption spectra of NiO-CNT and NiO–Fe-CNT were obtained in ethylene glycol solvent. The absorption peak of NiO nanoparticles was found to be at 300 nm . The absorption peak of NiO-CNT and NiO–Fe-CNT composites showed a blue shift to 257 and 261 nm, respectively, which may be due to the presence of CNTs (Figure a) .…”

Section: Resultsmentioning

confidence: 93%

“…The direct band gap of NiO nanoparticles is found to be 3.42 eV, , whereas the band gaps of NiO-CNT and NiO–Fe-CNT are found to be 3.02 and 2.6 eV, respectively (Figure b). The decrease in band gap in the composites is suggestive of CNT formation .…”

Section: Resultsmentioning

confidence: 97%

“…Synthesis of NiO-MWCNT composites was carried out via pyrolysis of waste HDPE plastics in a custom-made two-stage “pyrolysis reactor furnace” as reported in earlier works. ,, NiO catalysts were kept in a silica bed in the second reactor, and HDPE plastics were kept in a porcelain bed in the first reactor. The ratio of plastic and catalyst was kept as 1:1, and the furnace was made inert by N 2 gas with a flow rate of 100 mL/min during the entire process, which also acted as a carrier gas to carry hydrocarbons to the second reactor.…”

Section: Methodsmentioning

confidence: 99%

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Supercapacitor Performance of NiO, NiO-MWCNT, and NiO–Fe-MWCNT Composites

Shah,

Senapati,

Murthy

et al. 2023

ACS Omega

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The NiO-CNT and NiO–Fe-CNT composites that have been prepared from waste high density polyethylene plastic and their carbon nanotube (CNT) quality-dependent supercapacitance tuning have been reported here. Multiwalled CNT (MWCNT) formation has been confirmed from TEM and Raman spectra with an I D/I G ratio of 0.77, which stands for high graphitization. The specific surface area (SSA) of MWCNTs in the NiO–Fe-CNT composite was 87.8 m2/g, while in the NiO-CNT composite, it was 25 m2/g. NiO–Fe-CNT displayed higher specific capacitance and energy density (1360 Fg–1 and 1180 W h kg–1) than NiO-CNT (1250 Fg–1 and 1000 W h kg–1), which may be due to the presence of higher-quality MWCNTs in the NiO–Fe-CNT composite. NiO–Fe-CNT displayed higher contributions of electric double-layer capacitor (59%) behavior compared to NiO-CNT (38%) and represented a hybrid supercapacitor. NiO–Fe-CNT also displayed a capacitive retention of 96% after 1000 charge–discharge cycles. Furthermore, studies in acidic electrolytes revealed higher performance of NiO–Fe-CNT than NiO-CNT, displaying specific capacitances of NiO–Fe-CNT to be 1147 Fg–1 in 2 M H2SO4 and 943 Fg–1 in 2 M HCl. It has been qualitatively explored that the quality of CNTs, SSA, and quantum confinement effects in the composites may be the factors responsible for the performance difference in NiO–Fe-CNT and NiO-CNT. The present work is geared toward the low-cost fabrication of high-quality CNT composites for supercapacitors and energy storage applications. The present work also contributes quantitatively to the understanding of CNT quality as an important parameter for the performance of CNT-composite-based supercapacitors.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

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Supercapacitor Performance of NiO, NiO-MWCNT, and NiO–Fe-MWCNT Composites

Shah,

Senapati,

Murthy

et al. 2023

ACS Omega

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“…In this regard, waste expanded polystyrene (EPS) have been taken as low cost polymer source of polystyrene (PS) and waste plastic have been taken as low cost carbon source to develop CNT nano ller (Vieira et al 2021 ;Aunggat et al 2022). It is to be noted as per World Bank report (2002), only 9% of total waste plastic has been recycled in 1950 to 2018 and, 6% waste EPS have been recycled till 2018 (Nath et al 2021), and the rest are generating toxic gasses (dioxins, CO 2 , NO 2 , SO 2 , furans) and solid microplastics (Wu et al 2021). Here silica based heterostructure (SiO 2 -Fe 2 O 3 ) has been prepared from natural sand using the alkali fusion method and used as ller material due to high porosity and surface area (Colomer et al 2001 ;Ishmah et al 2020).…”

Section: Introductionmentioning

confidence: 99%

“…There are a variety of separation/removal techniques of dye such as photocatalysis (oxidation), adsorption, membrane ltration, bio-degradation, coagulation etc. (Nath et al 2021 ;Kasperchik et al 2012), where adsorption is a scalable method for purifying wastewater (Alaqarbeh et al 2021). Adsorption is a phenomenon on surfaces that largely involves the use of surface forces to absorb the solute/adsorbent and thereby separating the contaminants (Ashraf et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Green Preparation of Flexible and Transparent SiO2-Fe2O3-PS film for Dye Adsorption and UV-Shielding Applications

Nath

Mahato

2023

Preprint

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A multifunctional green polymer nanocomposite (SiO2-Fe2O3-PS) film has been prepared using earth-abandoned and waste materials such as natural sand, waste expanded polystyrene (EPS), and pea eggplant fruit extract. SiO2 was prepared using natural sand by alkali fusion method, SiO2-Fe2O3 was prepared by microwave assisted green synthesis method and the SiO2-Fe2O3-PS film was prepared by solution casting method. The SiO2-Fe2O3 (20:80)-PS film shows the shielding efficiency of 91–100% in the wavelength range of 390 − 200 nm and transparency of 71% to visible light at 800 nm. The SiO2-Fe2O3 (50:50)-PS film shows maximum adsorption capacity of 61.2% to methylene blue (MB) dye. The UV-Vis peak position of SiO2 (326 nm) and Fe2O3 (276 nm) are in line with the literature. The peak position in SiO2-Fe2O3 at different wt% ratio, were found at 290 nm (10:90), 328 nm (20:80), and 292 nm (50:50), which are indicative of the formation of heterostructure. The XRD data of SiO2-Fe2O3 comprises sharp peaks of both components that confirm the heterostructure formation and its crystalline nature. The SiO2-Fe2O3-PS composite formation was confirmed by FTIR and FESEM. The film is hydrophilic in nature (contact angle of 75.96°) and shows maximum thermal stability upto 381.6 ℃ (SiO2-Fe2O3 (20:80)-PS). The adsorption experiment was carried out using a 50 mg catalyst either in powder or film form with 100 mL dye solution of concentration 20 mg/L, where equilibrium adsorption was achieved within 180 minutes. The adsorption efficiency of SiO2, Fe2O3, SiO2-Fe2O3 (20:80), SiO2-Fe2O3(50:50), and SiO2-Fe2O3(50:50)-PS are found to be 98.3%, 3.88%, 91.1%, 96.2%, and 61.2%, respectively. The MB dye adsorption process follows pseudo second order kinetics and is best fitted with the Langmuir isotherm model. The novel SiO2-Fe2O3-PS film is found to be low cost, green, and environmentally friendly with multifunctional applications in the area of UV shielding, visible transparent and dye adsorption.

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