AgIO3-modified AgI/TiO2 composites for photocatalytic degradation of p-chlorophenol under visible light irradiation

Song, Shuang; Hong, Fangyue; He, Zhiqiao; Cai, Qiaolan; Chen, Jianmeng

doi:10.1016/j.jcis.2012.04.020

Cited by 42 publications

(22 citation statements)

References 44 publications

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“…In hybridization aspect between AgX and photocatalytic substrates, the photocatalysis elevation is based on the Z-scheme heterogeneous structure formation in order to gain high charge separation efficiency [316][317][318][319][320][321]. While incorporation of AgX in high specific surface area substrate is another promising strategy in photocatalytic activity promotion, especially in wastewater treatment [322][323][324][325][326].…”

Section: Other Non-photoactive Materialsmentioning

confidence: 99%

Regulations of silver halide nanostructure and composites on photocatalysis

Fan

Han

Song

et al. 2017

Adv Compos Hybrid Mater

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The silver halides and their corresponding composites would constitute remarkable photocatalytic systems not only in energy production but also in environmental remediation. The major advantage in these silver halides system is that plasma metal Ag 0 species would be spontaneously generated by silver halides under light irradiation, which play dual roles of expanding light absorption range and charge carriers separation. In this tutorial review, the origin and development of silver halides, synthesis methods, construction of composite structures with other materials, photocatalytic applications, and various and controversial mechanisms are all exhaustively described.

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Section: Other Non-photoactive Materialsmentioning

confidence: 99%

Regulations of silver halide nanostructure and composites on photocatalysis

Fan

Han

Song

et al. 2017

Adv Compos Hybrid Mater

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“…Although degradation begins with a partial degradation, the term 'photocatalytic degradation' usually refers to complete photocatalytic oxidation or photomineralisation, essentially to CO 2 , H 2 O, NO 3 -, PO4 3-, and halide ions [8]. Of the semiconductor materials being developed for photocatalytic applications, TiO 2 is the most suitable, because of its high oxidizing ability, long-term stability, low cost, and nontoxicity [9]. There are three morphological forms of TiO 2 ; rutile, anatase, and the rare mineral form, brookite.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic oxidation of phenol red onto nanocrystalline TiO2 particles

Wahab

Hussain

2016

J Nanostruct Chem

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The employment of UV/TiO 2 /O 2 /H 2 O 2 system for the degradation of phenol red in aqueous solutions using synthesized nanosized TiO 2 powder has been investigated in the present study. The anatase TiO 2 nanoparticles were synthesized using sol-gel methodology and characterized spectroscopically exploiting SEM, TEM, XRD, and DUR-UV-VIS, in addition to BET analysis. We observe that the degradation of the dye depends on several operational parameters, such as initial pH, catalyst dosage, initial concentration of the dye, UV light intensity, irradiation time, catalyst particle size, and the presence of electron acceptors, such as hydrogen peroxide, besides molecular oxygen. Kinetic analyses indicate that the photodegradation rates of phenol red dye follow the pseudo-first-order kinetics according to the Langmuir-Hinshelwood model. The influence of temperature in the range 25-45°C was studied. The degradation kinetics were somewhat accelerated by increase in temperature, and apparent activation energy was calculated to be 38.23 kJ mol -1 . Thermodynamic parameters, DH # , DG # , and DS # of activation were also computed for the degradation process.

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“…Table 4 shows examples of the main acceptors with which the mechanism studies on photocatalytic degradations in several matrices have been carried out. Compounds, such as NaF, have been used to inhibit the adsorption effect on the semiconductor particle and demonstrate the importance of the degradation reaction in bulk and not on its surface [92]. Moreover, the application of radical scavengers has been used to determine the main pathway that affects the photocatalytic degradation and to study the selectivity for certain radicals.…”

Section: %/150 Min Tio 2 P25mentioning

confidence: 99%

Recent Developments in the Photocatalytic Treatment of Cyanide Wastewater: An Approach to Remediation and Recovery of Metals

et al. 2019

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For gold extraction, the most used extraction technique is the Merrill-Crow process, which uses lixiviants as sodium or potassium cyanide for gold leaching at alkaline conditions. The cyanide ion has an affinity not only for gold and silver, but for other metals in the ores, such as Al, Fe, Cu, Ni, Zn, and other toxic metals like Hg, As, Cr, Co, Pb, Sn, and Mn. After the extraction stage, the resulting wastewater is concentrated at alkaline conditions with concentrations up to 1000 ppm of metals. Photocatalysis is an advanced oxidation process (AOP) able to generate a photoreaction in the solid surface of a semiconductor activated by light. Although it is well known that photocatalytic processes can remove metals in solution, there are no compilations about the researches on photocatalytic removal of metals in wastewater with cyanide. Hence, this review comprises the existing applications of photocatalytic processes to remove metal and in some cases recover cyanide from recalcitrant wastewater from gold extraction. The use of this process, in general, requires the addition of several scavengers in order to force the mechanism to a pathway where the electrons can be transferred to the metal-cyanide matrices, or elsewhere the entire metallic cyanocomplex can be degraded by an oxidative pathway.

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AgIO3-modified AgI/TiO2 composites for photocatalytic degradation of p-chlorophenol under visible light irradiation

Cited by 42 publications

References 44 publications

Regulations of silver halide nanostructure and composites on photocatalysis

Regulations of silver halide nanostructure and composites on photocatalysis

Photocatalytic oxidation of phenol red onto nanocrystalline TiO2 particles

Recent Developments in the Photocatalytic Treatment of Cyanide Wastewater: An Approach to Remediation and Recovery of Metals

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