Effect of UV light irradiation, pH and concentration on the dye sequestration efficiency of anionic surfactant based self-assembled aqueous mesophases

Duklan, Neha; Chamoli, Pankaj; Raina, K. K.; Shukla, Ravi K.

doi:10.1016/j.surfin.2021.101629

Cited by 4 publications

(1 citation statement)

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“…The concentration of MB was determined using a UV-vis (Evolution220, Thermo Scienti c, USA) spectrophotometer at its maximum absorption wavelength of 665 nm, the concentration of CR was determined using a UV-vis spectrophotometer at its maximum absorption wavelength of 495 nm. It is worth mentioning that the color of CR solution varies with pH (Duklan et al, 2022). Therefore, before using UV-vis spectrophotometer to detect CR solution, it is necessary to use pH buffer of disodium hydrogen phosphate and sodium dihydrogen phosphate mixed con guration to buffer carmine solution.…”

Section: Photocatalytic Degradation Of Mb and Crmentioning

confidence: 99%

Synthesis of CaWO 4 as a photocatalyst for degradation of methylene blue and carmine under ultraviolet light irradiation

Yuan

Sun

et al. 2022

Preprint

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Due to its advantages of high efficiency, simplicity of operation, and no secondary pollution, photocatalysis is considered as a promising method for wastewater treatment. Most synthesized photocatalysts are structure complex and costly. Thus, in this study, a novel CaWO4 sample was synthesized by a co-precipitation method in one step and proved as a preferable photocatalytic material by a series of characterization methods. The synthesized CaWO4 can be used as a catalyst to degrade dyes as methylene blue (MB) and carmine (CR), under UV light without the addition of oxidants. The effects of water matrix, including pH value, solid-liquid ratio, light intensity, and initial concentration of pollutants on photocatalytic degradation were studied. According to the results of scavengers experiments, holes and hydroxyl radicals dominate the degradation of MB while hydroxyl radical and superoxide anion are mainly responsible for the degradation of CR. Furthermore, i-t curves demonstrate the CaWO4 has good photoelectric response capability. It means that photogenerated electrons generated on the surface of the CaWO4 can form electron hole pairs, thereby forming hydroxyl radical and superoxide anion to degrade dyes. In addition, the CaWO4 has good cycling performance in the process of degrading MB. Results indicate that minerals-based photocatalyst can be synthesized in one step by simple coprecipitation and exhibit good photocatalytic effect. It provides a new idea for the study of photocatalytic degradation of dyes by mineral-like materials.

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Section: Photocatalytic Degradation Of Mb and Crmentioning

confidence: 99%