Photocatalytic degradation of dyes over a xylan/PVA/TiO2 composite under visible light irradiation

Li, Zhong‐Ming; Liu, Renwei; Yi, Yanbin; Han, Wei; Kong, Fangong; Wang, Shoujuan

doi:10.1016/j.carbpol.2019.115081

Cited by 39 publications

(11 citation statements)

References 48 publications

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“…The reaction mechanism between the SA/PVP/TiO2 nanocomposite beads and MB is examined by making use of pseudo-first order and pseudo-second order kinetic models. The reaction rate is usually described by the kinetic model, whereas the dependence of the former on the reacting species concentration defines the reaction order [33,34]. The For higher values of initial MB dye concentration, the photocatalyst activity is diminished.…”

Section: Kinetic Modelsmentioning

confidence: 99%

Novel Sodium Alginate/Polyvinylpyrrolidone/TiO2 Nanocomposite for Efficient Removal of Cationic Dye from Aqueous Solution

et al. 2021

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The combination of adsorption and photodegradation processes is an effective technique for the removal of dye contaminants from water, which is motivating the development of novel adsorbent-photocatalyst materials for wastewater treatment. Herein, novel nanocomposite porous beads were developed using titanium dioxide (TiO2) nanotubes embedded in a sodium alginate (SA)/polyvinylpyrrolidone (PVP) matrix using calcium chloride solution as a crosslinker. The prepared nanocomposite beads’ performance was examined as an adsorbent-photocatalyst for the breakdown of methylene blue in aqueous solutions. Several operation factors influencing the dye decomposition process, including photocatalyst dosage, illumination time, light intensity, and stability were investigated. The findings demonstrated that the removal activity of the beads changed with the TiO2 weight ratio in the composite. It was found that SA/PVP/TiO2-3 nanocomposite beads presented the greatest deterioration efficiency for methylene blue dye (98.9%). The cycling ability and reusability of the prepared SA/PVP/TiO2 nanocomposite beads recommend their use as efficient, eco-friendly materials for the treatment of wastewaters contaminated with cationic dyes.

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Section: Kinetic Modelsmentioning

confidence: 99%

Novel Sodium Alginate/Polyvinylpyrrolidone/TiO2 Nanocomposite for Efficient Removal of Cationic Dye from Aqueous Solution

et al. 2021

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“…On the other hand, by increasing the catalyst load to 3 wt.% more active sites for the photocatalytic reaction are available providing more chances for the hydroxyl ions adsorption onto the surface producing superoxide radicals. Meanwhile, at higher catalyst loading the photocatalytic activity was reduced, with the further increment in catalyst loading hampering the dye decay rate due to a shortage of light penetration [41]. Though both forms of WO 3 have terminal oxygen, the highest photocatalytic activity of WO 3 •0.33H 2 O nanorod may be due to higher oxygen vacancies.…”

Section: Effect Of Wo 3 Concentration In Sa/pvp Matrixmentioning

confidence: 99%

Effect of the Morphology of Tungsten Oxide Embedded in Sodium Alginate/Polyvinylpyrrolidone Composite Beads on the Photocatalytic Degradation of Methylene Blue Dye Solution

et al. 2020

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Tungsten oxide nanostructures were modified by oxygen vacancies through hydrothermal treatment. Both the crystalline structure and morphological appearance were completely changed. Spherical WO3·H2O was prepared from tungstic acid solution by aging at room temperature, while rod-like WO3·0.33H2O was prepared by hydrothermal treatment of tungstic acid solution at 120 °C. These structures embedded in sodium alginate (SA)/polyvinylpyrrolidone (PVP) were synthesized as novel porous beads by gelation method into calcium chloride solution. The performance of the prepared materials as photocatalysts is examined for methylene blue (MB) degradation in aqueous solutions. Different operation parameters affecting the dye degradation process, such as light intensity, illumination time, and photocatalyst dosage are investigated. Results revealed that the photocatalytic activity of novel nanocomposite changed with the change in WO3 morphology. Namely, the beads with rod nanostructure of WO3 have shown better effectiveness in MB removal than the beads containing WO3 in spherical form. The maximum degradation efficiency was found to be 98% for WO3 nanorods structure embedded beads, while the maximum removal of WO3 nanospheres structure embedded beads was 91%. The cycling-ability and reuse results recommend both prepared structures to be used as effective tools for treating MB dye-contaminated wastewaters. The results show that the novel SA/PVP/WO3 nanocomposite beads are eco-friendly nanocomposite materials that can be applied as photocatalysts for the degradation of cationic dyes in contaminated water.

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“…The catalytic activity in visible light was triggered by the interactions between TiO 2 and the conjugated structure of the polymeric membrane, which decrease the band gap and the electron/hole recombination rate for TiO 2 particles, thus assisting efficient separation of electron-hole pairs and improving the visible-light activity (Figure 1b Nowadays, the availability of synthetic polymers derived from oil, gas, and carbon (non-renewable sources) is decreasing, so the scientific community is looking for cheaper and more readily accessible alternatives, such as biopolymers derived from raw materials. For example, xylan is a biopolymer with excellent film forming properties used for the preparation of a xylan/polyvinyl alcohol (PVA)/TiO 2 composite, PVA being employed as a crosslinking agent and xylan as a template so that the TiO 2 particles homogeneously adhere to the composite surface [45]. The xylan/PVA/TiO 2 composite had a satisfactory photocatalytic performance under visible irradiation in the photodegradation of ethyl violet and Astrazon Brilliant Red 4G dyes.…”

Section: Tio 2 Immobilized On the Surfaces Of Polymer Substratesmentioning

confidence: 99%

“…This is the optimum concentration of catalyst for best results in photocatalysis, above this concentration a decrease of dyes bleaching rate occurred. Moreover, the xylan /PVA/TiO 2 composite showed good performance in phenol degradation, in 60 min being decomposed 93% phenol [45]. An interesting approach was to fabricate a photocatalyst by stacking a layer of Au@TiO 2 nanostructures on a chitosan fiber substrate [46].…”

Section: Tio 2 Immobilized On the Surfaces Of Polymer Substratesmentioning

confidence: 99%

Polymer Nanocomposites for Photocatalytic Applications

Melinte¹,

Stroea²,

Chibac-Scutaru³

2019

Catalysts

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In the present comprehensive review we have specifically focused on polymer nanocomposites used as photocatalytic materials in fine organic reactions or in organic pollutants degradation. The selection of the polymer substrates for the immobilization of the active catalyst particles is motivated by several advantages displayed by them, such as: Environmental stability, chemical inertness and resistance to ultraviolet radiations, mechanical stability, low prices and ease availability. Additionally, the use of polymer nanocomposites as photocatalysts offers the possibility of a facile separation and reuse of the materials, eliminating thus the post-treatment separation processes and implicitly reducing the costs of the procedure. This review covers the polymer-based photocatalytic materials containing the most popular inorganic nanoparticles with good catalytic performance under UV or visible light, namely TiO2, ZnO, CeO2, or plasmonic (Ag, Au, Pt, Pd) NPs. The study is mainly targeted on the preparation, photocatalytic activity, strategies directed toward the increase of photocatalytic efficiency under visible light and reuse of the hybrid polymer catalysts.

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Photocatalytic degradation of dyes over a xylan/PVA/TiO2 composite under visible light irradiation

Cited by 39 publications

References 48 publications

Novel Sodium Alginate/Polyvinylpyrrolidone/TiO2 Nanocomposite for Efficient Removal of Cationic Dye from Aqueous Solution

Novel Sodium Alginate/Polyvinylpyrrolidone/TiO2 Nanocomposite for Efficient Removal of Cationic Dye from Aqueous Solution

Effect of the Morphology of Tungsten Oxide Embedded in Sodium Alginate/Polyvinylpyrrolidone Composite Beads on the Photocatalytic Degradation of Methylene Blue Dye Solution

Polymer Nanocomposites for Photocatalytic Applications

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