Solar-light-harvesting degradation of aqueous ammonia by CuO/ZnO immobilized on pottery plate: Linear kinetic modeling for adsorption and photocatalysis process

Shavisi, Y.; Sharifnia, Shahram; Mohamadi, Zahra

doi:10.1016/j.jece.2016.04.035

Cited by 41 publications

(22 citation statements)

References 35 publications

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“…The kinetic evaluation of Ti_G photocatalytic properties (Figure 6) indicated the presence of two different intervals in the reaction pathway. The first interval (up to 240 min) corresponded to the induction period [35], followed by fast pollutant (Tr and Apd) removal [36], with a contribution of almost 75% in the total process. The second interval (from 240 to 480 min) showed a significant attenuation of the photocatalytic reaction rate, which can be attributed to surface inactivation due to the absorbance of the pollutant and the The first interval (up to 240 min) corresponded to the induction period [35], followed by fast pollutant (Tr and Apd) removal [36], with a contribution of almost 75% in the total process.…”

Section: Photocatalytic Propertiesmentioning

confidence: 99%

The Influence of Light Irradiation on the Photocatalytic Degradation of Organic Pollutants

Eneşca

Isac

2020

Materials

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The design of a photocatalytic process must consider intrinsic and extrinsic parameters affecting its overall efficiency. This study aims to outline the importance of balancing several factors, such as radiation source, total irradiance, photon flux, catalyst substrate, and pollutant type in order to optimize the photocatalytic efficiency. Titanium oxide was deposed by the doctor blade technique on three substrates (microscopic glass (G), flour-doped tin oxide (FTO), and aluminum (Al)), and the photocatalytic properties of the samples were tested on two pollutants (tartrazine (Tr) and acetamiprid (Apd)). Seven irradiation scenarios were tested using different ratios of UV-A, UV-B + C, and Vis radiations. The results indicated that the presence of a conductive substrate and a suitable ratio of UV-A and Vis radiations could increase the photocatalytic efficiency of the samples. Higher efficiencies were obtained for the sample Ti_FTO (58.3% for Tr and 70.8% for Apd) and the sample Ti_Al (63.8% for Tr and 82.3% for Apd) using a mixture of three UV-A and one Vis sources (13.5 W/m2 and 41.85 μmol/(m2·s)). A kinetic evaluation revealed two different mechanisms of reaction: (a) a one-interval mechanism related to Apd removal by Ti_FTO, Ti_Al (scenarios 1, 4, 5, and 7), and Ti_G samples (scenario 7) and (b) a two-interval mechanism in all other cases.

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Section: Photocatalytic Propertiesmentioning

confidence: 99%

The Influence of Light Irradiation on the Photocatalytic Degradation of Organic Pollutants

Eneşca

Isac

2020

Materials

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“…The photocatalytic ammonia degradation is a combination of photocatalytic and nonphotocatalytic reactions. On the basis of the published papers dealing with the photocatalytic ammonia degradation, the ammonia degradation initiates by surface oxidation of either H 2 O (path I) or NH 3 (path II) molecules through valence band holes. Both of the two paths lead to the formation of amide radical (•NH 2 ), the former through the attack of radical hydroxyl on NH 3 and the latter through deprotonation of NH 3 .…”

Section: Resultsmentioning

confidence: 99%

Preparation of floatable TiO ₂ /poly(vinyl alcohol)‐alginate composite for the photodegradation of ammonia wastewater

2019

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Summary The use of floatable photocatalyst supports is an operable strategy of increasing photocatalytic performance in terms of improving light absorption. In this work, floatable organic support based on poly(vinyl alcohol) (PVA) was used to float commercial TiO2 P25 nanoparticles. At first, by the use of CaCl2 and boric acid at pH 3 the cross‐linking of PVA blended with sodium alginate (PVA‐Alg) was improved to enhance chemical and mechanical stability, and then it was chemically modified by trimethylchlorosilane to achieve floatable organic support (modified or MPVA‐Alg). The prepared support and photocatalyst were characterized by X‐ray diffraction (XRD), Fourier‐transform infrared spectroscopy (FTIR), scanning electron microscopy, energy‐dispersive X‐ray spectroscopy (EDX)‐elemental mapping, inductively coupled plasma optical emission spectroscopy, ultraviolet‐visible (UV‐vis) diffuse reflectance spectroscopy, photoluminescence (PL), thermalgravimetry, Brunauer‐Emmett‐Teller (BET), and water contact angle (WCA) analyses and applied for the ammonia degradation under UV to visible regions. Results of WCA and FTIR confirmed that chemical modification of PVA‐Alg led to lowering hydrophilicity to be floated on the ammonia wastewater. UV‐vis analysis indicated that the MPVA‐Alg acts as a light absorbent in UV‐vis ranges and makes TiO2/MPVA‐Alg a visible light active composite. Also, the PL analysis showed that the charge recombination process was strongly suppressed in the case of the TiO2/MPVA‐Alg sample. BET theory suggested that the textural properties were not the key factor in determining photocatalytic performance. The maximum photocatalytic ammonia removal was obtained to be 63% and 57% by the TiO2/MPVA‐Alg composite under UV‐vis light irradiations, respectively. The MPVA‐Alg and TiO2 exhibited the ammonia degradation of 28.5% and 15.2% under visible and 29.4% and 40.0% under UV irradiation, respectively. The TiO2/MPVA‐Alg showed favorable reuse ability after five runs due to desirable chemical and mechanical resistance. This study provides an insight into the modification of polymeric structures to be used as both floatable photocatalyst support and light sensitizer.

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“…Compared with the degradation in the closed environment, the ventilation environment improved the removal rate of the target pollutants in a certain period of time and showed better removal effects. The reason may be that in an aqueous solution, ammonium ions (NH4 + ) can be partially ionized to ammonia and H + ; ammonia molecules are oxidized by successive attacks of OHradicals [8,24,25]. Under the dark reaction conditions, the composite the photocatalyst could not induce the formation of hydroxyl radicals with strong oxidation to achieve degradation as it lacked the excitation of the ultraviolet light on the semiconductor band.…”

Section: Under Natural Reaction Conditionsmentioning

confidence: 99%

“…Through an analysis carried out by Shavisi et al [8], it was indicated that 5 wt.% CuO loaded over ZnO could significantly increase the photocatalytic activity as 77.2% ammonia removal from synthetic wastewater was achieved within 240 min of solar irradiation time. Accordingly, ultraviolet and visible light are essential for the excitation of oxides (SnO2 and ZnO).…”

Section: Introductionmentioning

confidence: 99%

Treatment of Aquaculture Wastewater through Chitin/ZnO Composite Photocatalyst

Lin

Yang

Huang

et al. 2019

Water

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This paper proposed a newly explored composite photocatalyst, Chitin/ZnO, prepared via the sol-gel method for exploring its photocatalytic activity in the simulated aquaculture wastewater under UV irradiation. The study mainly involves the application of Chitin/ZnO from three aspects: the structure, the principle and the degradation efficiency. The effects of purification operation factors including mass ratio rate, dosage, calcination temperature, initial NH4+–N concentration and illumination conditions on the NH4+–N removal effectiveness were investigated. Optimum conditions were explored through orthogonal experiments, which revealed that 88.73% NH4+–N removal from 60 mg/L synthetic wastewater was achieved by direct illumination for 120 min. Additionally, Chitin/ZnO photocatalysts (mass ratio of 2:3) at a calcination temperature of 500 °C were favorable for Chitin loaded over a ZnO lattice. The obtained nanoparticles of Chitin/ZnO were characterized using SEM and X-ray diffraction. The purpose of this paper is to grope for an economical and easy method of Chitin/ZnO powder preparation and to provide a practical approach for future research on the photocatalytic purification of aquaculture wastewater.

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Solar-light-harvesting degradation of aqueous ammonia by CuO/ZnO immobilized on pottery plate: Linear kinetic modeling for adsorption and photocatalysis process

Cited by 41 publications

References 35 publications

The Influence of Light Irradiation on the Photocatalytic Degradation of Organic Pollutants

The Influence of Light Irradiation on the Photocatalytic Degradation of Organic Pollutants

Preparation of floatable TiO ₂ /poly(vinyl alcohol)‐alginate composite for the photodegradation of ammonia wastewater

Treatment of Aquaculture Wastewater through Chitin/ZnO Composite Photocatalyst

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Solar-light-harvesting degradation of aqueous ammonia by CuO/ZnO immobilized on pottery plate: Linear kinetic modeling for adsorption and photocatalysis process

Cited by 41 publications

References 35 publications

The Influence of Light Irradiation on the Photocatalytic Degradation of Organic Pollutants

The Influence of Light Irradiation on the Photocatalytic Degradation of Organic Pollutants

Preparation of floatable TiO 2 /poly(vinyl alcohol)‐alginate composite for the photodegradation of ammonia wastewater

Treatment of Aquaculture Wastewater through Chitin/ZnO Composite Photocatalyst

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Preparation of floatable TiO ₂ /poly(vinyl alcohol)‐alginate composite for the photodegradation of ammonia wastewater