Recovery and reuse of TiO2 photocatalyst from aqueous suspension using plant based coagulant - A green approach

Arunkumar, P.; Sarangapany, Saran; Devipriya, Suja P.

doi:10.1007/s11814-016-0059-9

Cited by 29 publications

(10 citation statements)

References 32 publications

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“…Some of the keys advantages of the TiO 2 catalyst are: its low toxicity, low cost, commercial availability and photochemical stability [10]; in addition, it shows the ability of degrading a wide range of organic pollutants. Indeed, it has been already reported by previous researches that suspended TiO 2 particles used in photoreactors give high activity due to their high surface area [11,12]. However, the semiconductor cannot be easily separated from the treated solution, and hence a recycling process is needed, which is a costly and complicated method to be applied on large scale [13].…”

Section: Introductionmentioning

confidence: 99%

Innovative photocatalytic luminous textiles optimized towards water treatment: Performance evaluation of photoreactors

Almansba

Kane²,

Nasrallah³

et al. 2021

Chemical Engineering Journal

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The photocatalytic removal of Flumequine (antibiotic) using a luminous textile which served as a support for the TiO 2 and a light transmitter through optical fibers was examined in this study. Two configurations of luminous textile were investigated (Mono-Face and Double-Face) in terms of compounds degradation and mineralization.Photocatalytic performances of Double-Face configuration were found to be better than the one obtained with Mono-Face. Furthermore, to describe the kinetics of the reaction, the Langmuir-Hinshelwood model was successfully applied and both reaction kinetic and adsorption/desorption equilibrium constants were determined. Double-Face configuration also showed better performances compared to the conventional process in the different 2 water matrices tested (ultrapure water, synthetic solution simulating seawater and synthetic hospital wastewater). This configuration was tested for cetirizine (antihistamine) degradation as well, with a satisfying result obtained. Moreover, this technology showed good stability and reusability. On the other hand, the larger size of Double-Face retained its performance at pilot-scale. Finally, the irradiation analyzes showed a good light distribution homogeneity on the textile surface at both laboratory-scale and pilot-scale.

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Section: Introductionmentioning

confidence: 99%

Innovative photocatalytic luminous textiles optimized towards water treatment: Performance evaluation of photoreactors

Almansba

Kane²,

Nasrallah³

et al. 2021

Chemical Engineering Journal

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“…It is obvious that ZnO-Ag/PS has a high degradation rate of MB dye under UV irradiation. According to these results, ZnO-Ag/PS can be used as treatment techniques to eliminate pollution by dyes through effluent wastewater [31][32][33].…”

Section: ■ Results and Discussionmentioning

confidence: 96%

ZNO-Ag/PS and ZnO/PS Films for Photocatalytic Degradation of Methylene Blue

et al. 2020

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Two films of ZnO-Ag/polystyrene (ZnO-Ag/PS) and ZnO/polystyrene (ZnO/PS) have been prepared and the photodegradation ability of stabilized catalysts was evaluated for methylene blue (MB) degradation. The efficiency of ZnO improved against recombination of electron-hole pair by modification of catalyst surface with Ag photodeposition to be more resistant towards photocorrosion. ZnO-Ag catalyst was characterized by SEM and EDS analysis to show high roughness of this catalyst and Ag deposited on the surface was 2% (molar ratio). ZnO-Ag/PS and ZnO/PS composites were made as films and were then analyzed by FTIR spectra that showed the interaction of ZnO and ZnO-Ag with polystyrene appeared in the range of 400-620 cm -1 , XRD pattern indicated the presence of Ag nanoparticles on the surface of ZnO and ZnO/PS film has maximum absorbance at 376 nm in UV-VIS spectra. This value shifted to 380 nm because of the photodeposition. The photocatalytic reaction was depicted using MB in the UVirradiation action of stacked films in MB solution. The result showed that both ZnO-Ag/PS and ZnO/PS films gave efficiency to remove MB by 97% and 70%, respectively. The reusability test of the films showed that ZnO-Ag/PS was more resistant than ZnO/PS. The presence of Ag also increased the efficiency in photodegradation and resistance against photocorrosion.

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“…This could be because the TiO 2 /Cu composite is embedded well in the pores of the porous polymer and prevented from loss upon exposing to simulated or natural sunlight irradiation, thereby leading to improved recyclability of PPTC than TiO 2 and TC [22]. Regrettably, PPTC only has about 20% degradation rate after five times of reuse, the main reason may be attributed to organic pollutants covering the pore of photocatalysts [23]. In addition, the little leaching of metallic Cu also affects the activity of photocatalysts.…”

Section: Photocatalytic Performance Of Tio 2 Tc and Pptcmentioning

confidence: 99%

Porous Polymer-Titanium Dioxide/Copper Composite with Improved Photocatalytic Activity toward Degradation of Organic Pollutants in Wastewater: Fabrication and Characterization as Well as Photocatalytic Activity Evaluation

Wang

Chi

et al. 2020

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Titanium dioxide (TiO 2 ) and TiO 2 /copper (denoted as TC) composite were prepared via hydrothermal process. In the meantime, divinylbenzene (DVB) and bismaleimide (BMI) monomers were allowed to participate in in-situ radical polymerization in the presence of azobisisobutyronitrile (AIBN) initiator to afford porous polymers (abridged as PP). The as-obtained PP were mixed together with tetrabutyl titanate (TBT) and CuSO 4 ·5H 2 O in vacuum to obtain PP/TC composite (denoted as PPTC) containing incorporated TC composite in the pores of PP. The as-prepared TiO 2 , TC, and PPTC were characterized by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, fluorescence spectrometry, and electron spin resonance spectrometry, and so on. Furthermore, their photocatalytic activity for the degradation of N,N-dimethylformamide, methyl orange, phenol, and methylene blue under the irradiation of simulated sunlight (Xe lamp light) and natural sunlight were investigated. Findings indicated that, whether under simulated sunlight or nature sunlight irradiation, PPTC exhibited much better photocatalytic performance than TiO 2 and TC for the degradation of the tested organic pollutants. Particularly, it allowed N,N-dimethylformamide (DMF) to be degraded by a rate of 73.7% under simulated sunlight irradiation and it retained photocatalytic activity even after six cycles of reuse, exhibiting promising potential for the removal of organic pollutants in wastewater (including industrial water, aquaculture wastewater, and domestic sewage). The desired photocatalytic performance of the as-prepared PPTC is attributed to two aspects. Namely, the incorporation of Cu 2+ into the fine structure of TiO 2 contributes to increasing photocatalyst activity and producing more free radical while the embedding of TC composite into the PP pores improves to the contact area between the photocatalyst and organic pollutants, and both are beneficial for improving the adsorption capacity and activity of the photocatalyst, thereby enhancing the degradation of the organic pollutants.

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Recovery and reuse of TiO2 photocatalyst from aqueous suspension using plant based coagulant - A green approach

Cited by 29 publications

References 32 publications

Innovative photocatalytic luminous textiles optimized towards water treatment: Performance evaluation of photoreactors

Innovative photocatalytic luminous textiles optimized towards water treatment: Performance evaluation of photoreactors

ZNO-Ag/PS and ZnO/PS Films for Photocatalytic Degradation of Methylene Blue

Porous Polymer-Titanium Dioxide/Copper Composite with Improved Photocatalytic Activity toward Degradation of Organic Pollutants in Wastewater: Fabrication and Characterization as Well as Photocatalytic Activity Evaluation

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