Photodegradation of Dye Pollutants Catalyzed by H₃PW₁₂O₄₀/SiO₂ Treated with H₂O₂ under Simulated Solar Light Irradiation

Abstract

Abstract. H 3 PW 12 O 40 /SiO 2 was prepared by a sol-gel method, and sensitized by H 2 O 2 solution. Their photocatalytic effects on degradation of organic dyes were investigated under simulated natural light irradiation. Degradation of methyl orange was used as a probe reaction to explore the influencing factors of the photodegradation reaction. After used continuously for five times, the catalytic activity of the photocatalyst is not any lower. The photodegradation of methyl orange, methyl red, methyl violet, rhodamine B, malachite green and methylene blue were also tested, and the degradation rate of dyes can reach 84.6 %~98.3 %. It was found that the photodegradation reaction belongs to the first-order kinetic reaction.

Tungstophosphate Intercalated ZnAl Layered Double Hydroxide for Adsorptive and Visible Light Driven Photocatalytic Decolourisation of Organic Dyes

“…The photocatalytic efficiencies of some related photocatalysts for degradation/decolourisation of different organic dyes were presented in Table 1, along with those observed in this work. It is worth noting that ZnAl-PW12 efficiently decolourises several shades under visible irradiation with comparable activity as those of other photocatalysts [27,[31][32][33][34][35][36]. The photocatalytic decolourisation/degradation of dyes by semiconducting oxides occurs most likely either through (i) photoexcitation of oxide leading to the electron/hole pairs on its surface followed by the formation of hydroxide radical (HO • ) by the decomposition of the water or by reaction of the holes with HO − and its response with dye molecules to yield the degradation products as delineated in Eqs.…”

Polymer-Based Immobilized FePMo12O40@PVP Composite Materials for Photocatalytic RhB Degradation

“…Therefore, it is crucial to modify POMs to enhance the photocatalytic degradation of organic pollutants. To achieve this objective, composite materials based on POMs are often modified by combining them with semiconductor oxides [25][26][27][28], molecular sieves [29][30][31][32], ion exchange resins [33], metal-organic frameworks (MOFs) [34][35][36][37][38], etc.…”