Photocatalytic degradation of Orange G using sepiolite-TiO 2 nanocomposites: Optimization of physicochemical parameters and kinetics studies

Photo-Degradation of Phenol Using TiO2/CMK-3 Photo-Catalyst Under Medium Pressure UV Lamp

“…Since the charge zero point (Pzc) of TiO 2 /CMK-3 is equal to 6.3, at the pH values from 4 to 6, the surface of photo-catalyst is positively charged, which results in more adsorption of the negatively charged phenol molecules on the surface of photo-catalyst and more possibility of degradation of adsorbed molecule on the surface of the photo-catalyst in the studied photo-catalytic process (10). Moreover, the presence of high volumes of holes in acidic pH increases the amount of phenol decomposition (31). These results are also confirmed by Lam et al (32).…”

TiO2 Immobilized on Fibrous Clay as Strategies to Photocatalytic Activity

“…Among photochemical AOPs, photocatalysis is an emerging technology for the degradation of organic pollutants 13 . There are several advantages over competing processes, such as complete mineralization, ambient temperature and pressure conditions, and, above all, a reduction in environmental impact for solid waste disposal 3,14,15 .…”

“…Based on the photocatalytic scope, the application of clay-based materials as carriers and/or heterostructures with semiconducting oxides [16][17][18][19] , for example, TiO 2 (titania) has attracted growing interest due to its properties of low toxicity, low cost and high photocatalytic efficiency, are being used as reference and/or standard photocatalysts because they combine attractive properties like chemical stability, high oxidizing power and nontoxicity [20][21][22][23] . However, despite the positive aspects, there are some limitations that hinder its practical application as the low surface area of TiO 2 and extremely thin thickness causing difficulty in the separation, recovery and reuse of particles and/or nanoparticles in aqueous solution 15,[24][25][26] . Thus, TiO 2 clusters become unfavorable to photocatalytic process 27 .…”

“…Modified clay materials have recently been used in the treatment of various polluting compounds 3,14,18,[28][29][30] to allow alterations in the semiconductor structure that favor charge separation mobility and, consequently, the yield in a photocatalytic oxidation process 18 . In addition, clay minerals are promising candidates for support due to their strong mechanical-chemical stability, cost-effectiveness, good adsorption capacity, which minimizes TiO 2 nanoparticle aggregation, inducing enhanced photocatalytic performance 15,31,32 .…”

Synthesis of Bi2WO6/Na-bentonite composites for photocatalytic oxidation of arsenic(iii) under simulated sunlight

“…31 To overcome these practical application problems, many researchers tried to design claybased composite photocatalysts using natural clay minerals as support materials. It was found that many clay-based composite photocatalysts are extremely effective for degrading organic matter or detoxication of heavy metal, including attapulgite, 32 zeolite, 33 rectorite, 34 bentonite, 35 sepiolite, 36 kaolinite. 37 The improved activity of composite photocatalysts can be attributed to the fast reactant adsorption rate, enlarged surface area, and improved stability of the composite photocatalysts compared to the bare photocatalysts.…”