Influence of parameters on the heterogeneous photocatalytic degradation of pesticides and phenolic contaminants in wastewater: A short review

In recent years, the application of heterogeneous photocatalytic water purification process has gained wide attention due to its effectiveness in degrading and mineralizing the recalcitrant organic compounds as well as the possibility of utilizing the solar UV and visible light spectrum. This paper aims to review and summarize the recently published works on the titanium dioxide (TiO2) photocatalytic oxidation of pesticides and phenolic compounds, predominant in storm and waste water effluents. The effect of various operating parameters on the photocatalytic degradation of pesticides and phenols are discussed. Results reported here suggested that the photocatalytic degradation of organic compounds depends on the type of photocatalyst and composition, light intensity, initial substrate concentration, amount of catalyst, pH of the reaction medium, ionic components in water, solvent types, oxidizing agents/electron acceptors, catalyst application mode, and calcinations temperature in water environment. A substantial amount of research has focused on the enhancement of TiO2 photocatalysis by modification with metal, non-metal and ion doping. Recent developments in TiO2 photocatalysis for the degradation of various pesticides and phenols are also highlighted in this review. It is evident from the literature survey that photocatalysis has shown good potential for the removal of various organic pollutants. However, still there is a need to find out the practical utility of this technique on commercial scale.

Influence of parameters on the heterogeneous photocatalytic degradation of pesticides and phenolic contaminants in wastewater : a short review

Degradation of sulfamethoxazole by microwave-activated persulfate: Kinetics, mechanism and acute toxicity

https://ir.nctu.edu.tw:443/bitstream/11536/25803/1/000287901900001.pdf

Current status of microwave application in wastewater treatment-A review

Since the late 1980s, the scientific community has been attracted to microwave energy as an alternative method of heating, due to the advantages that this technology offers over conventional heating technologies. In fact, differently from these, the microwave heating mechanism is a volumetric process in which heat is generated within the material itself, and, consequently, it can be very rapid and selective. In this way, the microwave-susceptible material can absorb the energy embodied in the microwaves. Application of the microwave heating technique to a chemical process can lead to both a reduction in processing time as well as an increase in the production rate, which is obtained by enhancing the chemical reactions and results in energy saving. The synthesis and sintering of materials by means of microwave radiation has been used for more than 20 years, while, future challenges will be, among others, the development of processes that achieve lower greenhouse gas (e.g., CO2) emissions and discover novel energy-saving catalyzed reactions. A natural choice in such efforts would be the combination of catalysis and microwave radiation. The main aim of this review is to give an overview of microwave applications in the heterogeneous catalysis, including the preparation of catalysts, as well as explore some selected microwave assisted catalytic reactions. The review is divided into three principal topics: (i) introduction to microwave chemistry and microwave materials processing; (ii) description of the loss mechanisms and microwave-specific effects in heterogeneous catalysis; and (iii) applications of microwaves in some selected chemical processes, including the preparation of heterogeneous catalysts.

/pdf/microwaves-and-heterogeneous-catalysis-a-review-on-selected-4ktd31ozg7.pdf

Microwaves and heterogeneous catalysis: A review on selected catalytic processes

Investigation on the degradation of brilliant green induced oxidation by NiFe2O4 under microwave irradiation

Study of the degradation behaviour of dimethoate under microwave irradiation.

Studies on the treatment of brilliant green solution by combination microwave induced oxidation with CoFe2O4

A new Re-doped nano-TiO2 photocatalyst was synthesized by immersion method. The novel doped nano-TiO2 photocatalyst utilizing visible light was firstly prepared. The doped nano-TiO2 powder was charactered by XRD, FTIR, UV-Vis, and its photocatalytic activity was tested through the photocatalytic degradation of methamidophos as a model compound under ultraviolet irradiating and in sunlight, respectively. In order to compare the photocatalytic activities, the same experiment was carried out for undoped nano-TiO2. The degradation ratio of methamidophos in the presence of doped nano-TiO2 reached 64.40% under sunlight for 12 h, which was 2.64% in the presence of undoped nano-TiO2. The degradation ratio of methamidophos in the presence of doped nanoTiO2 reached 90.39% under UV irradiationat 2.5 h, which was 51.29% in the presence of undoped nano-TiO2. All the results show that the doped TiO2 is a promising photocatalyst using sunlight for treating the organophosphorous pesticide wastewater.

A study on the degradation of methamidophos in the presence of nano-TiO2 catalyst doped with Re

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Investigation on the degradation of brilliant green induced oxidation by NiFe2O4 under microwave irradiation

Study of the degradation behaviour of dimethoate under microwave irradiation.

Studies on the treatment of brilliant green solution by combination microwave induced oxidation with CoFe2O4

A study on the degradation of methamidophos in the presence of nano-TiO2 catalyst doped with Re