期刊
ACS OMEGA
卷 6, 期 23, 页码 14734-14747出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c02325
关键词
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资金
- Karunya University
- Department of Science and Technology, Government of India
- Korea Ministry of Education, Science, and Technology via the National Research Foundation of Korea [NRF-2018R1A6A1A03025526]
- Korea University of Technology and Education
The grape seed soxhlet extract was found to be a cost-effective reducing agent for preparing GRGO, which showed superior electrochemical performance and photocatalytic activity when combined with TiO2 to form a nanocomposite. The material exhibited high specific capacitance and good stability, making it suitable for applications in supercapacitors and visible light photocatalysis.
The grape extract is a potential natural reducing agent because of its high phenolic content. The extracts of seeds, skin, and pulp of grape were prepared by digestion, grinding, and soxhlet methods and used for reducing graphene oxide (GO). The reduced GO made using the soxhlet extract of grape seed (GRGO) was hydrothermally treated with titanium dioxide (TiO2) for the synthesis of GRGO-TiO2 nanocomposite. The X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared (FT-IR), UV-vise photoluminescence, and Raman spectra studies further confirmed the formation of GRGO and the GRGO-TiO2 hybrid. Scanning electron microscope and transmission electron microscope studies showed the decoration of spherical TiO2 particles (<100 nm) on the few-layered GRGO sheets. The GRGO-TiO2 hybrid was explored as a working electrode for supercapacitors and visible light photocatgyst for water decontamination. GRGO-TiO2 showed higher specific capacitance (175 F g(-1)) than GRGO (150 F g(-1)) and TiO2 (125 F g(-1)) in an aqueous electrolyte. GRGO-TiO2 exhibited 83.6% capacitance retention even after 2000 cycles, indicating the good stability of the material. Further, under visible light irradiation lambda > 400 nm), GRGO-TiO2 showed similar to 30% higher photo-oxidation of the bromophenol blue (BPB) dye than TiO2. Also, GRGO-TiO2 decreased the total organic carbon content of BPB from 92 to 18 ppm. Overall, the soxhlet extract of grape seed was found to be a cost-effective reducing agent for the preparation of GRGO, which is a suitable material to be used in supercapacitors and photocatalysis.
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