Ternary Graphene Oxide and Titania Nanoparticles-Based Nanocomposites for Dye Photocatalytic Degradation: A Review

Abstract

Advanced oxidation processes stand as green alternatives for the decontamination of waste waters. Photocatalysis is an advanced oxidation process in which a semiconductor material absorbs photon energy and triggers redox reactions capable of degrading organic pollutants. Titanium dioxide (TiO2, titania) represents one of the most popular choices of photocatalytic materials, however the UV-activation of its anatase phase and its high charge recombination rate decrease its photocatalytic activity and weaken its potential. Graphene oxide is a 2D carbon nanomaterial consisting of exfoliated sheets of hexagonally arranged carbons decorated with oxygen- and hydrogen- functional groups. Composite nanomaterials consisting of titania nanoparticles and graphene oxide have proven to enhance the photocatalytic activity of pure TiO2. In this review, we present a thorough literature review of ternary nanocomposites based on synthesized or commercial titania nanoparticles and GO (or reduced GO) particularly used for the photodegradation of dyes. GO/TiO2 has been enriched primarily with metals, semiconductors and magnetic nanomaterials, proving a superior dye degradation performance and reusability compared to bare TiO2. Ongoing challenges and perspectives are outlined.

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

“…R 2 1.5 g-FePMo12O40@PVP 0.011 0.990 2 g-FePMo12O40@PVP 0.017 0.989 2.5 g-FePMo12O40@PVP 0.027 0.990 3 g-FePMo12O40@PVP 0.013 0.990 Using 2.5 g-FePMo12O40@PVP as catalyst, the degradation efficiency of RhB in composites under various conditions was assessed by altering the catalyst dosage (0.005 g, 0.01 Using 2.5 g-FePMo 12 O 40 @PVP as catalyst, the degradation efficiency of RhB in composites under various conditions was assessed by altering the catalyst dosage (0.005 g, 0.01 g, 0.015 g, and 0.02 g), the initial concentration of RhB (10 mg/L, 15 mg/L, 20 mg/L, and 25 mg/L), and the initial solution pH value (3)(4)(5)(6)(7)(8)(9)(10)(11). As depicted in Figure 7a, an increase in catalyst dosage from 0.005 g to 0.015 g resulted in a significant improvement in degradation efficiency (83% within 40 min).…”

“…Organic pollutants are a primary contributor to water pollution due to their high toxicity, strong accumulation, and resistance to degradation. Photocatalysis technology has been widely employed for the degradation of organic pollutants in water, offering advantages such as energy efficiency, environmental friendliness, and cost-effectiveness [1][2][3][4][5].…”