Optimization by factorial design of copper (II) and toxicity removal using a photocatalytic process with TiO2 as semiconductor

Yeber, María C.; Soto, Carolina; Riveros, Ruby; Navarrete, Joselyn; Vidal, Gladys

doi:10.1016/j.cej.2009.03.021

Cited by 37 publications

(17 citation statements)

References 49 publications

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“…4b and Table 2, the higher rate constant for photocatalytic reduction of copper occurred at lower pH values. Clearly, the pH values of TiO 2 @yeast suspensions had a great significant effect on the removal rate of cyanide, and the higher pH values both of cyanide and copper achieved lower reaction rate constant, consistent with the previously research of cyanide conducted by Chiang et al [9] and copper performed by Yeber et al [33].…”

Section: Effect Of Ph On the Photocatalytic Behaviorsupporting

confidence: 89%

Effect of different type of scavengers on the photocatalytic removal of copper and cyanide in the presence of TiO2@yeast hybrids

Zheng

Pan

et al. 2015

J Mater Sci: Mater Electron

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Effect of different type of organic or inorganic additions (formic acid, AgNO 3 , NaCl) on the photocatalytic reduction of copper and photooxidation of cyanide with illuminated TiO 2 @yeast was studied in this work together with the impact of solution pH values and contact time. The results indicated that pH values exhibited a great effect on the adsorption and photocatalytic performance of cyanide and copper because the surface charge of the TiO 2 @yeast and the existence form of cyanide and copper are highly pH dependent. The optimal adsorption and photo-oxidation of cyanide was observed at pH 2.0 while the best adsorptive and photocatalytic efficiency for copper was achieved at pH 5.0 within the studied range. The addition of formic acid increased the photo-reduction rate of copper and inhibited the photo-oxidation of cyanide. AgNO 3 , as electron acceptor, restrained the Cu(II) reduction from 75.0 to 30.5 %, whereas accelerate the photooxidation of cyanide. Besides, the presence of chloride ions retarded the removal efficiency of both cyanide and copper. The first-order kinetic model well described the experimental data. One possible mechanism of the effect of additives on copper and cyanide degradation was discussed.

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Section: Effect Of Ph On the Photocatalytic Behaviorsupporting

confidence: 89%

Effect of different type of scavengers on the photocatalytic removal of copper and cyanide in the presence of TiO2@yeast hybrids

Zheng

Pan

et al. 2015

J Mater Sci: Mater Electron

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“…Most of previous reports devoted to remove EDTA from water using heterogeneous catalysis have been conducted using TiO 2 semiconductor catalyst irradiated with wide range of spectral lamps [15][16][17][18][19][20][21]. This means, to date there are challenges for developing the controlling parameters of the heterogeneous photocatalysis, including developing new types of catalyst, deep investigation on catalyst operation and its performance evaluation and other relevant aspects as well.…”

Section: Introductionmentioning

confidence: 97%

Composition and phase control of Ni/NiO nanoparticles for photocatalytic degradation of EDTA

Harraz

Mohamed

Shawky

et al. 2010

Journal of Alloys and Compounds

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“…According to literature reports, RSM has been proven to be effective for the photocatalytic degradation process for wastewater treatment. Among them, one can refer, for instance, to the degradation of different dyes [20][21][22], metal ions [23,24] and other industrial effluents [19,25]. However, at the present time, there are limited studies dealing with the application of RSM that have been reported on the treatment of phenol present in wastewater.…”

Section: Introductionmentioning

confidence: 98%

Optimizing photocatalytic degradation of phenol by TiO2/GAC using response surface methodology

Sin

Lam

Mohamed

2010

Korean J. Chem. Eng.

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TiO 2 deposited on granular activated carbon (TiO 2 /GAC) was used for photocatalytic degradation of phenol. The effects of photocatalyst loading, initial substrate concentration and addition of an oxidizing agent as H 2 O 2 were investigated using a one-factor-at-a-time experiment. Central composite design, an experimental design for response surface methodology (RSM), was used for the modelling and optimization of the phenol degradation. Analysis of variance (ANOVA) indicated that the proposed quadratic model was in agreement with the experimental case with R 2 and R 2 adj correlation coefficients of 0.9760 and 0.9544, respectively. Accordingly, the optimum conditions for phenol degradation were a photocatalyst loading of two layers, initial phenol concentration of 34.44 mg L −1 and H 2 O 2 concentration of 326.90 mg L −1 . The TiO 2 /GAC was used for five cycles with phenol degradation efficiency still higher than 90%. Finally, the phenol that remained adsorbed on GAC was able to migrate to TiO 2 and then photocatalytically be degraded.

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Optimization by factorial design of copper (II) and toxicity removal using a photocatalytic process with TiO2 as semiconductor

Cited by 37 publications

References 49 publications

Effect of different type of scavengers on the photocatalytic removal of copper and cyanide in the presence of TiO2@yeast hybrids

Effect of different type of scavengers on the photocatalytic removal of copper and cyanide in the presence of TiO2@yeast hybrids

Composition and phase control of Ni/NiO nanoparticles for photocatalytic degradation of EDTA

Optimizing photocatalytic degradation of phenol by TiO2/GAC using response surface methodology

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