scholarly journals Enhanced Simultaneous Photocatalytic Removal of SO2 and CO2 Using Powder and Coated Zeolites-Supported TiO2 Under Concentrated Sunlight Irradiation

2021 ◽  
Author(s):  
Zahra Razavi ◽  
Nourollah Mirghaffari ◽  
Mohsen Soleimani
Keyword(s):  
Natural Zeolite ◽  
Single Step ◽  
Solar Irradiation ◽  
Simultaneous Removal ◽  
Parabolic Trough ◽  
Sunlight Irradiation ◽  
Photocatalytic Removal ◽  
Stone Cutting ◽  
Removal Of So2 ◽  
Maximum Removal

Abstract Single-step process for simultaneous removal of gaseous pollutants is more advantageous than multi-steps one. In this study, the efficiency of a novel synthetic zeolite (Ze) prepared from stone cutting sludge and a natural zeolite (clinoptilolite, Cp) as the supports of TiO2 photocatalyst were examined for the separate and simultaneous removal of SO2 and CO2 under solar irradiation using a parabolic trough collector (PTC). The composites exhibited a higher efficiency than raw zeolites and TiO2 for the removal of both gases. The maximum removal of SO2 by TiO2-Ze and TiO2-Cp under sunlight was 41.9 % and 56.2 % that enhanced to 53.4 % and 78.8 %, respectively in the presence of CO2. Correspondingly, it was 61.8 % and 68.7 % for single CO2 removal that increased to 74.2 % and 79.0 % in the binary gas stream. This behavior could be due to the enhanced simultaneous SO2 oxidation and CO2 reduction. The performance of coated composite for SO2 was higher than of powder one (54.3% vs. 41.9%) and for CO2 removal was almost close together (58.9% vs. 61.2%). This work promises the application of photocatalytic co-removal of SO2 and CO2 by using synthetic and natural zeolite under solar irradiation.

Photocatalytic removal of SO2 using natural zeolite modified by TiO2 and polyoxypropylene surfactant

2018 ◽  
Vol 26 (17) ◽  
pp. 16877-16886 ◽  
Author(s):  
Nasibeh Amini ◽  
Mohsen Soleimani ◽  
Nourollah Mirghaffari
Keyword(s):  
Natural Zeolite ◽  
Photocatalytic Removal ◽  
Removal Of So2

Simultaneous Photocatalytic Removal of Cr(IV) Ions and Methylene Blue Using InVO4/TiO2 Nanocomposites under the Sunlight Irradiation

2013 ◽  
Vol 668 ◽  
pp. 313-316 ◽  
Author(s):  
Zhuo Zhao
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Degradation Rate ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Anatase Tio2 ◽  
Simultaneous Removal ◽  
Sunlight Irradiation ◽  
Photocatalytic Removal ◽  
Sol Gel Process

InVO4/TiO2 nanocomposites were synthesized via a sol-gel process, and their microstructure and morphology were characterized by XRD and FESEM. XRD analysis indicated that incorporation of InVO4 with low content (In:Ti mole ratio of 1:200) could not change the crystallinity of anatase TiO2. The photocatalytic activity of anatase TiO2 increased for more than 2 folds by incorporating small amount of InVO4 into TiO2. The MB degradation rate kapp increased from 1.147×10-2 to 1.75×10-2 min-1 while the added Cr(IV) concentration was 5mg/L. The results indicated that simultaneous removal of aqueous Cr(IV) ions and organic compounds was feasible in the photocataltyic reactions under sunlight irradiation.

scholarly journals Straightforward Synthesis of Mn3O4/ZnO/Eu2O3-Based Ternary Heterostructure Nano-Photocatalyst and Its Application for the Photodegradation of Methyl Orange and Methylene Blue Dyes

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4661
Author(s):  
Jayachamarajapura Pranesh Shubha ◽  
Haralahalli Shivappa Savitha ◽  
Syed Farooq Adil ◽  
Mujeeb Khan ◽  
Mohammad Rafe Hatshan ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Methyl Orange ◽  
Irradiation Time ◽  
Solar Irradiation ◽  
Anionic Dyes ◽  
One Pot ◽  
Sunlight Irradiation ◽  
Ft Ir ◽  
Degradation Activity ◽  
Ecological Applications

Zinc oxide-ternary heterostructure Mn3O4/ZnO/Eu2O3 nanocomposites were successfully prepared via waste curd as fuel by a facile one-pot combustion procedure. The fabricated heterostructures were characterized utilizing XRD, UV–Visible, FT-IR, FE-SEM, HRTEM and EDX analysis. The photocatalytic degradation efficacy of the synthesized ternary nanocomposite was evaluated utilizing model organic pollutants of methylene blue (MB) and methyl orange (MO) in water as examples of cationic dyes and anionic dyes, respectively, under natural solar irradiation. The effect of various experimental factors, viz. the effect of a light source, catalyst dosage, irradiation time, pH of dye solution and dye concentration on the photodegradation activity, was systematically studied. The ternary Mn3O4/ZnO/Eu2O3 photocatalyst exhibited excellent MB and MO degradation activity of 98% and 96%, respectively, at 150 min under natural sunlight irradiation. Experiments further conclude that the fabricated nanocomposite exhibits pH-dependent photocatalytic efficacy, and for best results, concentrations of dye and catalysts have to be maintained in a specific range. The prepared photocatalysts are exemplary and could be employed for wastewater handling and several ecological applications.

Metal-Modified Active Coke for Simultaneous Removal of SO2 and NOx from Sintering Flue Gas

2014 ◽  
Vol 29 (1) ◽  
pp. 377-383 ◽  
Author(s):  
Yanran Zuo ◽  
Honghong Yi ◽  
Xiaolong Tang
Keyword(s):  
Flue Gas ◽  
Simultaneous Removal ◽  
Removal Of So2

scholarly journals Facile Synthesis of Porous ZnO Nanoparticles Efficient for Photocatalytic Degradation of Biomass-Derived Bisphenol A Under Simulated Sunlight Irradiation

2021 ◽  
Vol 8 ◽  
Author(s):  
Yujie Wang ◽  
Kang Hu ◽  
Zhiyu Yang ◽  
Chenlu Ye ◽  
Xin Li ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Photocatalytic Degradation ◽  
Inorganic Ions ◽  
Endocrine Disrupting Compounds ◽  
Degradation Process ◽  
Sunlight Irradiation ◽  
Calcination Temperatures ◽  
Endocrine Disrupting Compound ◽  
Endocrine Disrupting ◽  
Photocatalytic Removal

Bisphenol A (BPA) produced from biomass is a typical endocrine disrupting compound that is carcinogenic and genotoxic and can be accumulated in water due to its extensive use and difficult degradation. In this study, the porous ZnO photocatalyst with core-shell structure and large surface area was successfully developed for the efficient photocatalytic degradation of BPA. The various effects of calcination temperatures, BPA concentrations, ZnO dosages, pH and inorganic ions on the degradation performance were systemically studied. The results showed that 99% degradation of BPA was achieved in 1 h using the porous ZnO calcined at 550°C under the conditions of 30 mg/L BPA, 1 g/L ZnO, and pH of 6.5. Besides, the inhibition effects of anions for the photocatalytic removal of BPA decreased in the order of H2PO4- > HCO3- > SO42- > Cl−, while the cations K+, Ca2+, and Na+ had little effect on the photocatalytic degradation of BPA. The results of scavenging experiments showed that h+, ·O2-, and e− played the key role in the photocatalytic degradation process. Finally, the main pathways of BPA degradation were proposed based on ten intermediates found in the degradation process. This work may provide a good guideline to degrade various endocrine disrupting compounds in wastewater treatment.

Simultaneous removal of SO2 and NO from flue gas using iron-containing polyoxometalates as heterogeneous catalyst in UV-Fenton-like process

Fuel ◽  
2019 ◽  
Vol 250 ◽  
pp. 42-51 ◽  
Author(s):  
Yi Zhao ◽  
Yuhong Han ◽  
Tianhao Wang ◽  
Zhonghao Sun ◽  
Chi Fang
Keyword(s):  
Heterogeneous Catalyst ◽  
Flue Gas ◽  
Simultaneous Removal ◽  
Removal Of So2
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