Photocatalytic and photoelectrocatalytic performance of sonochemically synthesized Cu2O@TiO2 heterojunction nanocomposites

Kaviyarasan, K.; Vinoth, Victor; Sivasankar, Thirugnanasambandam; Asiri, Abdullah M.; Wu, Jerry J.; Anandan, Sambandam

doi:10.1016/j.ultsonch.2018.10.022

Cited by 62 publications

(32 citation statements)

References 24 publications

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“…The consequence of photoelectrochemical measurements shows that the composite heterojunction of p-Cu 2 O/n-TiO 2 can facilitate the transfer of electrons across the heterojunction interface, advantageous for improving photocatalytic performance. The experimental results show that Cu 2 O nanocubes extensively enhance the TiO 2 response, which shows higher activity compared to neat TiO 2 [ 159 ]. In the case of POME treatment, Chin et al [ 127 ] reported that 3 wt % Nb 2 O 5 /ZnO exhibited 3.7 and 1.4-folds enhancement of COD removal after 240 min and color removal after 30 min photocatalytic reaction durations, respectively.…”

Section: Photocatalytic Technology For Pome Treatmentmentioning

confidence: 99%

“…Many attempts to research and study the effect of pH on photocatalytic activity, one of which uses the point of zero charges (PZC) of TiO 2 . PZC is a pH value where the surface charge component is equal to zero under given conditions of temperature, applied pressure, and soil solution composition [ 159 ] (PZC = 6–8 depending on TiO 2 sample) [ 178 ]. Suppose pH < (PZC)TiO 2 , the photocatalyst’s surface charge is positive and is gradually given electrons by organic compounds adsorbed to the TiO 2 -activated photon to undergo different photocatalytic reactions.…”

Section: Operational Parameters/factors Affecting the Photocatalytic Degradation Processmentioning

confidence: 99%

“…This increased photo activity is caused by Bi 2 S 3 dispersion, which effectively increases the reception of visible photons. [159]. In the case of POME treatment, Chin et al [127] reported that 3 wt % Nb 2 O 5 /ZnO exhibited 3.7 and 1.4-folds enhancement of COD removal after 240 min and color removal after 30 min photocatalytic reaction durations, respectively.…”

Section: Other Semiconductors Dopantsmentioning

confidence: 99%

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Photocatalytic Technology for Palm Oil Mill Effluent (POME) Wastewater Treatment: Current Progress and Future Perspective

et al. 2021

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The palm oil industry produces liquid waste called POME (palm oil mill effluent). POME is stated as one of the wastes that are difficult to handle because of its large production and ineffective treatment. It will disturb the ecosystem with a high organic matter content if the waste is disposed directly into the environment. The authorities have established policies and regulations in the POME waste quality standard before being discharged into the environment. However, at this time, there are still many factories in Indonesia that have not been able to meet the standard of POME waste disposal with the existing treatment technology. Currently, the POME treatment system is still using a conventional system known as an open pond system. Although this process can reduce pollutants’ concentration, it will produce much sludge, requiring a large pond area and a long processing time. To overcome the inability of the conventional system to process POME is believed to be a challenge. Extensive effort is being invested in developing alternative technologies for the POME waste treatment to reduce POME waste safely. Several technologies have been studied, such as anaerobic processes, membrane technology, advanced oxidation processes (AOPs), membrane technology, adsorption, steam reforming, and coagulation. Among other things, an AOP, namely photocatalytic technology, has the potential to treat POME waste. This paper provides information on the feasibility of photocatalytic technology for treating POME waste. Although there are some challenges in this technology’s large-scale application, this paper proposes several strategies and directions to overcome these challenges.

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Section: Photocatalytic Technology For Pome Treatmentmentioning

confidence: 99%

Section: Operational Parameters/factors Affecting the Photocatalytic Degradation Processmentioning

confidence: 99%

Section: Other Semiconductors Dopantsmentioning

confidence: 99%

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Photocatalytic Technology for Palm Oil Mill Effluent (POME) Wastewater Treatment: Current Progress and Future Perspective

et al. 2021

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“…Besides, the kinetic study of dye elimination enactment was deliberated agreeing to an equation of linear pseudo-rst-order relation model, -Ln(C 0 /C t ) = kt. Wherever C t was the absorption found to MB dye in the preferred time intervals, k stands for the dye removal pseudo-rst-order rate constant, C 0 has the initial absorbance of the MB dye at t = 0 min, and relative time t. For photocatalytic recycling trials, the investigational ailment was xed as similar as aqueous MB photo-degradation format, and hence the catalysts have further washed, dried to succeeding reaction cycle [26]. The remaining concentration of aqueous MB dye was projected in each cycle for assessing the reusability of the asfabricated PCs.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

A Novel α‑Fe2O3/TiO2 heterostructured nanocomposite with Enhanced Visible-light Photocatalytic Performance for Degradation of Organic Pollutant

Kavitha¹,

Ranjith

Jayamani³

2021

Preprint

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A novel heterostructured catalyst of TiO2/α‑Fe2O3 nanocomposite (NC) was successfully fabricated by the facile hydrothermal method and mutual ultrasonication. To characterize the as-fabricated photocatalysts (PCs) by PXRD, FT-IR, HRSEM, HRTEM, UV-Vis DRS absorption, and PL spectra analysis relatively. The optical absorbance of TiO2/α‑Fe2O3 NC was measured in the wavelength range from ~ 320–800 nm and the optical bandgap (Eg) was declined from 3.21 to 2.72 eV. The photocatalytic efficiency of TiO2/α‑Fe2O3 composite catalyst was assayed in the degradation of aqueous methylene blue (MB) dye in the visible-light influence. The results showed that the heterostructured α‑Fe2O3/TiO2 catalyst was much faster and higher removal efficiency of MB dye (~ 92.7 %) than the other photocatalytic degradation of pristine TiO2 (33 %) and α‑Fe2O3 (47.3 %) in 100 min. The enriched photocatalytic efficiency also accredited to enlarged energy harvesting ability, enhanced in the widened absorption in visible-light region, synergistic effects produced a great number of photo-produced electron-hole (e−/h+) separation, stronger oxidation ability by hydroxyl radicals (−OH.) via the interfaces of α‑Fe2O3 dispersed TiO2 heterojunction. All these outcomes specify that the highly stable and recyclable TiO2/α‑Fe2O3 photocatalyst has the possibility of the practical application for wastewater treatment.

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“…It has been reported that the combination of sonocatalysis and photocatalyis outperformed either of them alone in catalytic degradation of dyes. [22][23][24][25][26] The combination of semiconductor and ultrasound is considered to be viable option as sonocatalysis due to safe and economical use of nanomaterials. 24,[27][28][29] It has been reported that the sonocatalytic activity of nanoparticles dependent of the types of nanoparticles as well as materials with the increasing order of montmorillonite clay < anatase-TiO 2 < ZnO < rutile-TiO 2 < Fe 3 O 4 for the sonocatalytic degradation of 2-hydroxyethyl cellulose.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effects of Carbon Dots and Palladium Nanoparticles Enhances the Sonocatalytic Performance for Rhodamine B Degradation in the Absence of Light

Selim¹,

Kaur²,

Dar³

et al. 2020

Preprint

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Carbon dot (CD) and palladium nanoparticles (Pd NPs) composites are semiconducting materials having tremendous applications in catalysis with suitable bandgap. However, their combination with suitable polymer matrix in sono-photo-catalysis has not been explored. Herein, we have synthesized and characterized a new nano-hybrid catalyst from polyamide cross-linked CD-polymer and subsequent deposition of Pd NPs. Sonocatalytic activity of 99% rhodamine B dye-degradation was achieved in mere 5 minutes (min) under dark. Model catalyst replacing CD with benzene and other control studies revealed that synergistic effects of CD and Pd NPs enhances the sonocatalytic activity of nano-hybrid catalyst. Interestingly, visible light did not influence the activity significantly. While mechanistic investigations suggest that generation of reactive oxygen species on the surface of CD-polymer initiated by ultrasound which further facilitated by Pd NPs is the key for remarkable catalytic activity (rate constant 0.99 min<sup>-1</sup>). Recyclable heterogeneous catalyst under ambient conditions are promising for the utility of exploring sono-assisted dark-catalysis for several avenues.

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Photocatalytic and photoelectrocatalytic performance of sonochemically synthesized Cu2O@TiO2 heterojunction nanocomposites

Cited by 62 publications

References 24 publications

Photocatalytic Technology for Palm Oil Mill Effluent (POME) Wastewater Treatment: Current Progress and Future Perspective

Photocatalytic Technology for Palm Oil Mill Effluent (POME) Wastewater Treatment: Current Progress and Future Perspective

A Novel α‑Fe2O3/TiO2 heterostructured nanocomposite with Enhanced Visible-light Photocatalytic Performance for Degradation of Organic Pollutant

Synergistic Effects of Carbon Dots and Palladium Nanoparticles Enhances the Sonocatalytic Performance for Rhodamine B Degradation in the Absence of Light

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