Surfactant- and template-free hydrothermal assembly of Cu2O visible light photocatalysts for trimethoprim degradation

Karthikeyan, S.; Chuaicham, Chitiphon; Balijapalli, Umamahesh; Li, Wei; Wilson, Karen; Lee, Adam F.; Sasaki, Keiko

doi:10.1016/j.apcatb.2020.119741

Cited by 65 publications

(25 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 8a illustrates the PL spectra of Cu-HySurea and Cu-HyS-NaOH in the emission wavelength range of 400-480 nm with the maximum emission peak at 442 nm (excitation wavelength at 330 nm). A lower PL intensity refers to a lower photogenerated electron-hole pair recombination rate [50,51]. The Cu-HyS-urea sample showed a lower PL emission intensity than Cu-HyS-NaOH at a wavelength of approximately 442 nm for the excitation wavelength at 370 nm, which implies that the high crystallinity of Cu-HyS-urea and some intercalation of carbonate anions in the structure of hydrotalcite-like copper hydroxyl salts can enhance the separation of the photogenerated electron-hole pairs in the Cu-HyS-urea.…”

Section: Verification Of Charge Transfer Separation and Production Of Electron And Holementioning

confidence: 99%

Fabrication of Hydrotalcite-like Copper Hydroxyl Salts as a Photocatalyst and Adsorbent for Hexavalent Chromium Removal

et al. 2022

Self Cite

View full text Add to dashboard Cite

Cu-HyS-urea and Cu-HyS-NaOH, which are hydrotalcite-like copper hydroxyl salts, were prepared by two different methods, urea hydrolysis and precipitation, respectively. Both synthesis methods provided the successful formation of a copper hydroxyl salt, Cu2(OH)3NO3. From XRD and UV-DRS results, the product from the urea hydrolysis methods (Cu-HyS-urea) displayed higher crystallinity, small bandgap energy (Eg), and high light absorption ability because of some intercalated carbonate anions. For the Cr(VI) removal test, the Cu-HyS-NaOH showed superior adsorption of Cr(VI) than Cu-HyS-urea due to a higher specific surface area, confirmed by BET analysis. However, the Cu-HyS-urea presented higher photocatalytic Cr(VI) reduction under light irradiation than Cu-HyS-NaOH, owing to narrow Eg, less recombination, and a high transfer of the photogenerated charge carriers, proven by the results from photoluminescence, photocurrent density, and electrochemical impedance spectroscopy. Thus, this work provides a new function of the hydrotalcite-like copper hydroxyl salts (Cu-HyS-urea and Cu-HyS-NaOH) that can be utilized not only for adsorption of Cr(VI) but also as photocatalysts for Cr(VI) reduction under light irradiation.

show abstract

Section: Verification Of Charge Transfer Separation and Production Of Electron And Holementioning

confidence: 99%

Fabrication of Hydrotalcite-like Copper Hydroxyl Salts as a Photocatalyst and Adsorbent for Hexavalent Chromium Removal

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…For the water and wastewater treatment, many nanomaterials were investigated besides the photocatalytic nanoparticles discussed earlier. Metal-oxide photocatalysts such as tungsten trioxide (WO 3 ) (Isari et al 2020) and cuprous oxide (Cu 2 O) (Sekar et al 2021) are among the most extensively researched. However, due to their low stability and fast electron-hole recombination, their photocatalytic efficacy is restricted.…”

Section: Other Nanometal Oxidesmentioning

confidence: 99%

Recent advances in photocatalytic remediation of emerging organic pollutants using semiconducting metal oxides: an overview

Prakruthi

Ujwal

Yashas

et al. 2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

Many untreated and partly treated wastewater from the home and commercial resources is being discharged into the aquatic environment these days, which contains numerous unknown and complex natural and inorganic compounds. These compounds tend to persist, initiating severe environmental problems, which affect human health. Conventionally, physicochemical treatment methods were adopted to remove such complex organic chemicals, but they suffer from critical limitations. Over time, photocatalysis, an advanced oxidation process, has gained its position for its efficient and fair performance against emerging organic pollutant decontamination. Typically, photocatalysis is a green technology to decompose organics under UV/visible light at ambient conditions. Semiconducting nanometal oxides have emerged as pioneering photocatalysts because of large active surface sites, flexible oxidation states, various morphologies, and easy preparation. The current review presents an overview of emerging organic pollutants and their effects, advanced oxidation processes, photocatalytic mechanism, types of photocatalysts, photocatalyst support materials, and methods for improving photodegradation efficiency on the degradation of complex emerging organic pollutants. In addition, the recent reports of metal-oxide-driven photocatalytic remediation of emerging organic pollutants are presented in brief. This review is anticipated to reach a broader scientific community to understand the first principles of photocatalysis and review the recent advancements in this field.

show abstract

“…Compared to Fe/Mt/TiO 2, the xFe-Mt/(1 − x)Fe-TiO 2 composite showed a slight red shift in the absorption edge, and such an extension in the absorption band influenced the optical properties of samples significantly. By using the Tauc plotting Kubelka-Munk function versus energy, the optical bandgap energy (Eg) of Fe-Mt can be evaluated, according to Equation (1) (Figure 6b) [54][55][56]:…”

Section: Investigation Of Optical and Charge Separation Propertiesmentioning

confidence: 99%

Fabrication of Adsorbed Fe(III) and Structurally Doped Fe(III) in Montmorillonite/TiO2 Composite for Photocatalytic Degradation of Phenol

et al. 2021

Self Cite

View full text Add to dashboard Cite

The Fe(III)-doped montmorillonite (Mt)/TiO2 composites were fabricated by adding Fe(III) during or after the aging of TiO2/Ti(OH)4 sol–gel in Mt, named as xFe-Mt/(1 − x)Fe-TiO2 and Fe/Mt/TiO2, respectively. In the xFe-Mt/(1 − x)Fe-TiO2, Fe(III) cations were expected to be located in the structure of TiO2, in the Mt, and in the interface between them, while Fe(III) ions are physically adsorbed on the surfaces of the composites in the Fe/Mt/TiO2. The narrower energy bandgap (Eg) lower photo-luminescence intensity were observed for the composites compared with TiO2. Better photocatalytic performance for phenol degradation was observed in the Fe/Mt/TiO2. The 94.6% phenol degradation was due to greater charge generation and migration capacity, which was confirmed by photocurrent measurements and electrochemical impedance spectroscopy (EIS). The results of the energy-resolved distribution of electron traps (ERDT) suggested that the Fe/Mt/TiO2 possessed a larger amorphous rutile phase content in direct contact with crystal anatase than that of the xFe-Mt/(1 − x)Fe-TiO2. This component is the fraction that is mainly responsible for the photocatalytic phenol degradation by the composites. As for the xFe-Mt/(1 − x)Fe-TiO2, the active rutile phase was followed by isolated amorphous phases which had larger (Eg) and which did not act as a photocatalyst. Thus, the physically adsorbed Fe(III) enhanced light adsorption and avoided charge recombination, resulting in improved photocatalytic performance. The mechanism of the photocatalytic reaction with the Fe(III)-doped Mt/TiO2 composite was proposed.

show abstract

Surfactant- and template-free hydrothermal assembly of Cu2O visible light photocatalysts for trimethoprim degradation

Cited by 65 publications

References 69 publications

Fabrication of Hydrotalcite-like Copper Hydroxyl Salts as a Photocatalyst and Adsorbent for Hexavalent Chromium Removal

Fabrication of Hydrotalcite-like Copper Hydroxyl Salts as a Photocatalyst and Adsorbent for Hexavalent Chromium Removal

Recent advances in photocatalytic remediation of emerging organic pollutants using semiconducting metal oxides: an overview

Fabrication of Adsorbed Fe(III) and Structurally Doped Fe(III) in Montmorillonite/TiO2 Composite for Photocatalytic Degradation of Phenol

Contact Info

Product

Resources

About