Au nanoparticle modified three-dimensional network PVA/RGO/TiO2 composite for enhancing visible light photocatalytic performance

Zhang, Liang; Qi, Haojie; Zhao, Yuan; Zhong, Lei; Zhang, Yujuan; Wang, Yao; Xue, Juanqin; Li, Yue

doi:10.1016/j.apsusc.2019.143855

Cited by 49 publications

(17 citation statements)

References 47 publications

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“…This decrease in the bandgap energy can help to increase the photocatalytic activity of the nanocomposite in the visible range, which can be related to the delay in the electron-hole recombination in the presence of PVA and silver atoms [28][29][30].…”

Section: -1-characterization Of the Synthesized Ag/tio2/pva Nanocompo...mentioning

confidence: 99%

Visible-light-responsive Ag/TiO2/PVA nanocomposite for photocatalytic degradation of Cr, Ni, Zn, and Cu heavy metal ions

Dehghani

Delnavaz

2022

Preprint

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The rapid growth of industrialization has led to the uncontrolled pollution of the environment, and rapid action is needed. This study synthesized Ag/TiO2/polyvinyl alcohol (PVA) nano photocatalyst for promising light-derived photocatalytic removal of heavy metal ions. The design of experiment (DOE) was used to study the effect of important factors (pH, reaction time, and photocatalyst dosage) to maximize the final performance of the photocatalyst. In the optimized condition, the Ag/TiO2/PVA nano-photocatalyst removed more than 94% of Cr6+ in 180 minutes, and the efficiency was more than 70% for Cu2+, Zn2+, and Ni2+ metal ions. The adsorption of the heavy metal ions on the photocatalyst was described well with the Langmuir isotherm, while the pseudo-second-order linear kinetic model fitted with the experimental data. The nano-photocatalyst's stability was confirmed after maintaining its performance for five successive runs. The enhanced photocatalytic activity for the heavy metal ions removal can be attributed to the presence of metallic silver nanoparticles (electron transfer and plasmonic fields mechanisms) and PVA, which delayed the recombination of electron-hole. The synthesized ternary Ag/TiO2/PVA nano-photocatalyst showed promising performance for the elimination of heavy metal ions and can be used for environmental remediation purposes.

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Section: -1-characterization Of the Synthesized Ag/tio2/pva Nanocompo...mentioning

confidence: 99%

Visible-light-responsive Ag/TiO2/PVA nanocomposite for photocatalytic degradation of Cr, Ni, Zn, and Cu heavy metal ions

Dehghani

Delnavaz

2022

Preprint

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“…When the initial RhB concentration increased, more dye molecules were adsorbed onto the catalyst, but after the catalyst reached adsorption-desorption equilibrium, the concentration of dye molecules in the solution no longer changed. As the initial dye concentration increased, more dye molecules were excited by absorbed photons, which resulted in greater energy transfer during the photocatalytic degradation process, and adsorption sites were created to help remove the dye (Luo et al 2019;Zhang et al 2019). However, the high concentration of dyes at the surface of the catalyst caused the transfer of photons to the photocatalyst to be blocked by the absorption by the adsorbed dye molecules, reducing the number of photons reaching the catalyst surface (Guo et al 2014).…”

Section: Effect Of Initial Rhb Concentration and Ph On Dye Removalmentioning

confidence: 99%

A Unique RGO Aerogel/TiO2/MoS2 Composite Photocatalyst with a 3D Sandwich Network for the Removal of Organic Dyes by the Cooperative Action of Adsorption and Photocatalysis

Zhang

et al. 2021

Preprint

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A unique composite with a three dimensional (3D) sandwich network structure consisting of reduced graphene oxide aerogel/titanium dioxide/molybdenum disulfide (abbreviated as RGO aerogel/TiO2/MoS2) was developed for the removal of organic dyes from solution cooperatively by adsorption and photocatalytic degradation mechanisms. The composite was successfully synthesized by stepwise hierarchical assembly integration, including sol-gel and physical vapor deposition (PVD) methods. The resulting multicomponent composite material featured a high specific surface area (255.441 m2/g) absorption capacity manifested by the myriad negatively charged carboxylate function groups on the surface of the composite. The composite material demonstrated ideal optical and photocatalytic properties, including a large absorbance in the visible light region and a fast transfer of photogenerated electron-hole pairs, resulting in a superb photodegradation performance. The RGO aerogel/TiO2/MoS2 also exhibited a high cationic dyes removal efficiency through the cooperative adsorption and photocatalytic degradation mechanisms. Moreover, electron paramagnetic resonance (EPR) analysis and reactive oxygen species scavenging experiments confirmed that superoxide radicals (O2•−), holes (h+), and hydroxyl radicals (•OH) were involved in photocatalytic degradation of the organic dyes.

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“…For overcoming the weak absorption of visible light and rapid recombination rate of photogenerated electron–hole pairs, it is possible to modify the surface TiO 2 with organic polymers as a coating structure to improve interfacial charge transfer [ 29 ], by decreasing the LUMO level through reducing the energy bandgap and increasing the photocatalytic efficiency under visible light [ 30 ]. Besides, these polymers have several functional groups, promoting the structure reactivity towards organic substances, leading to a crosslinked compound with high photocatalytic efficiency.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of TiC@C-anatase/rutile@polyvinyl alcohol/xylan: a powerful photocatalyst for degradation of organic pollutant under visible light

et al. 2022

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In this study, a composite bearing titanium carbide (TiC), titanium dioxide (TiO 2 ), polyvinyl alcohol and xylan (TiC@C-anatase/rutile@polyvinyl alcohol/xylan) was synthesized and applied as a photocatalyst for the degradation of bromophenol blue (BPB) solution through several steps. Nanostructure of TiC and TiO 2 in the anatase and rutile phases was obtained through heat treatment of TiC at different times and temperatures (TiC@AR) which led to a reduction in energy bandgap from UV to visible light, in addition to the enhancement of the surface activity. After TiC@AR polymerization by xylan and polyvinyl alcohol and obtaining TiC@AR/PX, the energy bandgap reduced to IR range (52% of the sunlight) while showing an enhancement in the surface activity. The photocatalytic activity of the compounds was tested by studying the decomposition of BPB solution under visible light. The result illustrated the ability of TiC and TiC@AR to decrease the concentration of BPB after 150 min by 35% and 37%, respectively, while this reduction was 72% for TiC@AR/PX. Considering the effective parameters, the energy bandgap and the surface layer played key roles in photocatalytic degradation.

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Au nanoparticle modified three-dimensional network PVA/RGO/TiO2 composite for enhancing visible light photocatalytic performance

Cited by 49 publications

References 47 publications

Visible-light-responsive Ag/TiO2/PVA nanocomposite for photocatalytic degradation of Cr, Ni, Zn, and Cu heavy metal ions

Visible-light-responsive Ag/TiO2/PVA nanocomposite for photocatalytic degradation of Cr, Ni, Zn, and Cu heavy metal ions

A Unique RGO Aerogel/TiO2/MoS2 Composite Photocatalyst with a 3D Sandwich Network for the Removal of Organic Dyes by the Cooperative Action of Adsorption and Photocatalysis

Synthesis of TiC@C-anatase/rutile@polyvinyl alcohol/xylan: a powerful photocatalyst for degradation of organic pollutant under visible light

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