Removal of bisphenol A and methylene blue through persulfate activation by calcinated α-MnO2 nanorods: effect of ultrasonic assistance and toxicity assessment

Mathew, Annu T.; Saravanakumar, M.P.

doi:10.1007/s11356-022-23146-x

Cited by 9 publications

(1 citation statement)

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“…The BPA degradation was studied using silent and ultrasonic-assisted systems over persulfate-mediated α-MnO 2 nanorods with varying operational parameters such as persulfate dose, catalyst calcination temperature, concentration of the BPA, dosage of nanorods, reaction medium pH, ultrasound frequency and power, scavengers, and land ll leachate medium. 25 The 96.5% BPA was removed using an ultrasonic system under optimized reaction conditions. It was noticed that α-MnO 2 nanorods calcined at 400°C for 3 h showed signi cant physicochemical and thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Structure-Dependent Activity of Ru/CeO2 Catalysts for Oxidative Degradation of Plastic Chemical Bisphenol A by Catalytic Wet Oxidation

Roy,

Barman

2024

Preprint

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One of the important defects is the oxygen vacancy on metal oxide surfaces, and the defects function as the active sites in different catalytic reactions. Herein, Ru/CeO2-rod and Ru/CeO2-cube catalysts were prepared via the ESI method, and CeO2-rod and CeO2-cube supports were synthesized by hydrothermal processes. The activity of these catalysts was tested in a high-pressure fixed-bed reactor, and the oxidative degradation of industrial organic raffinate containing the plastic chemical bisphenol A (BPA) was compared with their oxygen vacancy concentration estimated after calcination. The Ru/CeO2-rod catalyst showed higher catalytic activity with 90% BPA conversion at 453 K, 30 bar, 0.5% Ru metal content, 15 O2 to BPA molar ratio, and 2 g-1.h-1 BPA feed WHSV. In contrast, 80% BPA degradation was achieved using the Ru/CeO2-cube catalyst under similar reaction conditions. The higher oxygen vacancy concentration and the higher interfacial surface area between metal and the support of the CeO2-rod supported Ru catalyst triggered the higher BPA degradation at low oxidation conditions. Besides, the atomic ratio, Ce3+/Ce4+, is lower in the Ru/CeO2-rod catalyst than that of the Ru/CeO2-cube catalyst, indicating the higher Ce4+ available in the catalyst, leading to the higher degradation of BPA. Moreover, the Ru/CeO2-rod catalyst possesses {111} planes that boost the generation of energetic Ru to improve the pursuit of the catalyst. The Weisz-Prater modulus and Thiele modulus values indicated that the surface reaction is the rate limitation step and there is no diffusion limitation. TEM, HRTEM, XPS, Raman, H2-TPR, XRD, CO chemisorption and BET surface area analyzers were used to characterize the catalysts.

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Section: Introductionmentioning

confidence: 99%