Promoting a well-dispersion of MoO3 nanoparticles on fibrous silica catalyst via one-pot synthesis for enhanced photoredox environmental pollutants efficiency

Contamination of water sources with various organic and inorganic non-biodegradable pollutants is becoming a growing concern due to industrialization, urbanization, and the inefficiency of traditional wastewater treatment processes. Simultaneous removal of dual pollutants via photocatalytic redox reaction has been tremendously explored in the last five years due to the effective decontamination of pollutants compared to a single pollutants system. In a photocatalysis mechanism, the holes in the valence band can remarkably promote the oxidation of a pollutant. At the same time, photoexcited electrons are also consumed for the reduction reaction. The synergist between the reduction and oxidation inhibits the recombination of electron-hole pairs extending their lifetime. Here we review the use of metal oxide-based photocatalysts for the simultaneous removal of tetracycline and hexavalent chromium. Several strategies for the enhancement of this treatment method which are the pH of mixed pollutants and the addition of additives are discussed This review offers a recent perspective on the development of photocatalysis systems for industrial applications.

Section: Strategies To Enhance Simultaneous Removal Of Cr (Vi) and Tcmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Recent advances on simultaneous removal of hexavalent chromium and tetracycline: A short review

Hassan

2024

“…The microemulsion method was utilized in the synthesis of fibrous silica bismuth sulfide (FSBS) [25]. Firstly, 150 ml of toluene and 25.5 ml of 1-butanol were blended into 280 ml of distilled water.…”

Section: Synthesis Of Fibrous Silica Bismuth Sulfidementioning

confidence: 99%

Fibrous silica bismuth sulfide: An advanced material towards promising photoelectrochemical water-splitting

Nik Lah,

Tuan Abdullah,

Sawal

et al. 2024

The emission of greenhouse gaseous to the atmosphere as a consequence of the utilization of fossil fuels has significantly contributed to global warming and sudden climax change which aroused a lot of concerns. This occurrence has indirectly spurred interest in hydrogen energy as a future alternative energy due to its environmentally friendly, high efficiency and long-term energy storage. Photoelectrochemical (PEC) water-splitting is a top-notch approach that can efficiently produce hydrogen. Moreover, semiconductor materials like bismuth sulfide have often been used as photoanode material in the PEC water-splitting study due to their narrow bandgap, high optical absorption coefficient, appropriate band alignment and low toxicity. Yet, Bi2S3 photoanode suffers from the rapid recombination of charge carriers which ultimately leads to sluggish water oxidation kinetics and poor charge transfer. Interestingly, the fabrication of fibrous silica bismuth sulfide (FSBS) not only demonstrated a low bandgap energy level but also effectively separated the photoproduced charges. In addition, the FSBS photoanode also showed a photocurrent density of 47.9 mA/cm2 at 1.23 VRHE which is 1.78 times greater than the commercial BS photoanode (26.9 mA/cm2). These findings indirectly exposed the potential of FSBS photoanode towards a sustainable PEC water-splitting application.

“…A few relatively large absorption bands can be seen in the spectra at 1240, 1090, 966, 798 and 470 cm -1 . These are due to the presence of an asymmetric Si-O-Si longitudinal-optic stretching, Si-O-Si transverse-optic asymmetric stretching, an external Si-O-H group, Si-O-Si asymmetric stretching, and Si-O-Si bending vibration [20,21]. Notably, the band at 966 cm -1 at FSCdS-6H was increase compared to FSCdS-8H which explained that highest strength of Si-O-M band in FSCdS-8H framework [22].…”

Section: Functional Group Analysismentioning

confidence: 99%

Effect of aging times of fibrous silica cadmium sulfide photoanodes for enhanced photoelectrochemical water splitting

Sawal,

Jalil,

Chowdhury

et al. 2024

The use of photoelectrochemical (PEC) water splitting to produce hydrogen from solar sources is an alluring potential address to the world’s energy and environmental problems. Cadmium Sulfide (CdS) is a potentially visible light response photoanode of PEC water splitting, but practical use remains a significant barrier due to its low charge carrier separation efficiency. To address this disadvantage, modifications to the morphology of CdS is necessary. Herein, fibrous silica cadmium sulfide (FSCdS) photoanode for PEC water splitting was synthesized using microemulsion method reported in this study. In this study, it will be focused on the effect of aging times which is 6 hours and 8 hours on the structure of FSCdS towards the PEC water splitting. The physicochemical and electrical properties of the photoanodes were investigated using XRD, UV-Vis DRS, FTIR and EIS Nyquist Plot. FSCdS-6H had a higher photocurrent density of 22.1 mA/cm2 at 1.23 VRHE and a higher solar-to-hydrogen (STH) efficiency of 27.2% when compared to FSCdS-8H with 13.0 mA/cm2 and STH of 16.0%. This is due to the better crystallinity, higher Si-Cd-S interaction, and lower electron hole recombination rate of FSCdS-6H photoanode. Fabrication of fibrous silica-based photoanodes revealed significant insight for the creation of highperformance photoanodes for improved PEC water splitting performance.