Microwave/Persulphate assisted ZnO mediated photocatalysis (MW/PS/UV/ZnO) as an efficient advanced oxidation process for the removal of RhB dye pollutant from water

Gayathri, Padinchare Veettil; Yesodharan, Suguna; Yesodharan, E.P.

doi:10.1016/j.jece.2019.103122

Cited by 59 publications

(21 citation statements)

References 64 publications

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“…Effect of the Presence of SO4 2− Ions Anions/salts of different types are present in all-natural sources of water. Therefore, it is important to evaluate these anions (especially SO4 2− ) in water purification through photocatalytic processes [61]. The effect of the presence of 0.1 mol L −1 sodium sulfate was investigated in the dye discoloration in the presence of 1.5 g L −1 photoactive materials at 25 °C.…”

Section: Photocatalytic Assaysmentioning

confidence: 99%

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Oxide-Clay Mineral as Photoactive Material for Dye Discoloration

Miranda

Viana²,

Honorio³

et al. 2020

Minerals

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Titanium and zirconium oxides (TiO2 and ZrO2, respectively) were obtained from alkoxides hydrolyses, and then deposited into palygorskite clay mineral (Pal) to obtain new materials for photocatalytic applications. The obtained materials were characterized by structural, morphological, and textural techniques. X-ray diffraction (XRD) results confirmed the characteristic peaks of oxides and clay transmission electron microscopy (TEM) and scanning electron microscopy (SEM) images of the modified palygorskite with both oxides showed that the clay was successfully modified by the proposed method. The increase in the specific surface area of the clay occurred when TiO2 and ZrO2 were deposited on the surface. The photocatalytic activity of these materials was investigated using the Remazol Blue anion dye under UV light. The evaluated systems presented high photocatalytic activity, reaching approximately 98% of dye discoloration under light. Thus, TiO2–Pal and ZrO2–TiO2–Pal are promising clay mineral-based photocatalysts.

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Section: Photocatalytic Assaysmentioning

confidence: 99%

“…Anions/salts of different types are present in all-natural sources of water. Therefore, it is important to evaluate these anions (especially SO 4 2− ) in water purification through photocatalytic processes [61].…”

Section: Effect Of the Presence Of So 4 2− Ionsmentioning

confidence: 99%

Oxide-Clay Mineral as Photoactive Material for Dye Discoloration

Miranda

Viana²,

Honorio³

et al. 2020

Minerals

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“…Relevant results ,,,, showed that compared with ultrasonic, photochemical and electrochemical activation, microwave activation had longer radiation distance because it can even penetrate solids, possessing a good prospect of application. In the field of water treatment, some researchers employed microwave to activate peroxides (i.e., H 2 O 2 , PS, and PMS) to generate free radicals to degrade organic contaminants from wastewater. ,,,,,,,, However, microwave-activated SO 4 • – -based AOTs are not suitable for wastewater treatment because most of the microwave radiation energy will be consumed in heating and evaporation of water, instead of activating oxidants. In the field of gaseous pollutants removal, several researchers ,, used catalysts under microwave activation to remove gaseous pollutants.…”

Section: Progress In So4•–-based Aots For Gaseous Pollutant Removalmentioning

confidence: 99%

A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies

Liu

Wang

2021

Environ. Sci. Technol.

105

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Excessive emissions of gaseous pollutants such as SO2, NO x , heavy metals (Hg, As, etc.), H2S, VOCs, etc. have triggered a series of environmental pollution incidents. Sulfate radical (SO4•–)-based advanced oxidation technologies (AOTs) are one of the most promising gaseous pollutants removal technologies because they can not only produce active free radicals with strong oxidation ability to simultaneously degrade most of gaseous pollutants, but also their reaction processes are environmentally friendly. However, so far, the special review focusing on gaseous pollutants removal using SO4•–-based AOTs is not reported. This review reports the latest advances in removal of gaseous pollutants (e.g., SO2, NO x , Hg, As, H2S, and VOCs) using SO4•–-based AOTs. The performance, mechanism, active species identification and advantages/disadvantages of these removal technologies using SO4•–-based AOTs are reviewed. The existing challenges and further research suggestions are also commented. Results show that SO4•–-based AOTs possess good development potential in gaseous pollutant control field due to simple reagent transportation and storage, low product post-treatment requirements and strong degradation ability of refractory pollutants. Each SO4•–-based AOT possesses its own advantages and disadvantages in terms of removal performance, cost, reliability, and product post-treatment. Low free radical yield, poor removal capacity, unclear removal mechanism/contribution of active species, unreliable technology and high cost are still the main problems in this field. The combined use of multiactivation technologies is one of the promising strategies to overcome these defects since it may make up for the shortcomings of independent technology. In order to improve free radical yield and pollutant removal capacity, enhancement of mass transfer and optimization design of reactor are critical issues. Comprehensive consideration of catalytic materials, removal chemistry, mass transfer and reactor is the promising route to solve these problems. In order to clarify removal mechanism, it is essential to select suitable free radical sacrificial agents, probes and spin trapping agents, which possess high selectivity for target specie, high solubility in water, and little effect on activity of catalyst itself and mass transfer/diffusion parameters. In order to further reduce investment and operating costs, it is necessary to carry out the related studies on simultaneous removal of more gaseous pollutants.

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“…Many organisms are poisoned by Congo red, a suspected carcinogen and mutagen, [18] indicating the need to remove this dye. Various methods, such as sedimentation, [2,19] membrane processes, [20] oxidation, [21] photocatalysis, [22] and adsorption, [23,24] have been used so far; however, the adsorption has been mostly considered for lower cost, better selectivity, better efficiency, and smooth operation. Metal-organic frameworks (MOFs) are one of the adsorbents used in the adsorption process.…”

Section: Introductionmentioning

confidence: 99%

Rapid and Effective Ultrasonic‐Assisted Adsorptive Removal of Congo Red onto MOF‐5 Modified by CuCl₂ in Ambient Conditions: Adsorption Isotherms and Kinetics Studies

2021

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In this study, ultrasonic-assisted removed Congo red by MOF-5/ Cu as a metal-organic framework, making the adsorption process very fast. Ultrasonic has proven to be a handy tool in accelerating dyes' adsorption by enhancing the adsorbent's affinity and the adsorbent. MOF-5 synthesized the solvothermal method and then modified it by CuCl 2 in ambient conditions. Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Fourier Transform Infrared (FT-IR), Brunauer-Emmett-Teller (BET), and Thermogravimetric analysis (TGA) were used for the identification structure and morphology of MOF-5/Cu. Sonication had an essential role in shortening the adsorption time (2 min) of Congo red by enhancing the dispersion of adsorbent (MOF-5) in solution. Congo red concentration was measured with a UV-visible spectrometer apparatus. Optimal values of Congo red concentration, Dosage of MOF-5/Cu, time, and pH were obtained by Central composite design. According to the optimal parameters, the adsorption process was very rapid. Removal of Congo red happened with excellent adsorption capacity (357.42 mg g À 1 ). Also, the MOF-5/Cu was regenerating by acetone five-time and show good results. Repeatability of the adsorption process was carried out, and the Relative Standard Deviation (RSD) was obtained 1.85 %.

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Microwave/Persulphate assisted ZnO mediated photocatalysis (MW/PS/UV/ZnO) as an efficient advanced oxidation process for the removal of RhB dye pollutant from water

Cited by 59 publications

References 64 publications

Oxide-Clay Mineral as Photoactive Material for Dye Discoloration

Oxide-Clay Mineral as Photoactive Material for Dye Discoloration

A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies

Rapid and Effective Ultrasonic‐Assisted Adsorptive Removal of Congo Red onto MOF‐5 Modified by CuCl₂ in Ambient Conditions: Adsorption Isotherms and Kinetics Studies

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Microwave/Persulphate assisted ZnO mediated photocatalysis (MW/PS/UV/ZnO) as an efficient advanced oxidation process for the removal of RhB dye pollutant from water

Cited by 59 publications

References 64 publications

Oxide-Clay Mineral as Photoactive Material for Dye Discoloration

Oxide-Clay Mineral as Photoactive Material for Dye Discoloration

A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies

Rapid and Effective Ultrasonic‐Assisted Adsorptive Removal of Congo Red onto MOF‐5 Modified by CuCl2 in Ambient Conditions: Adsorption Isotherms and Kinetics Studies

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Product

Resources

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Rapid and Effective Ultrasonic‐Assisted Adsorptive Removal of Congo Red onto MOF‐5 Modified by CuCl₂ in Ambient Conditions: Adsorption Isotherms and Kinetics Studies