scholarly journals Economic and Ultrafast Photocatalytic Degradation of Orange II Using Ceramic Powders

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 733
Author(s):  
Dikra Bouras ◽  
Abla Mecif ◽  
Abdelhamid Harabi ◽  
Régis Barillé ◽  
Abdel hakim Mahdjoub ◽  
...  
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Chemical Reaction ◽  
Orange Ii ◽  
Ceramic Powders ◽  
Degradation Of Dyes ◽  
Reaction Processes

Different percentages of CuO and ZnO were added into a local kaolin ceramic-based powder (DD3) with and without ZrO2. The modified powders were first characterized, then, a test for the photocatalytic degradation of dyes with orange II (OII) was carried out. The DD3 powders that were obtained with the addition of ZrO2, ZnO, and CuO, were prepared by two different methods and have shown a large and very fast photocatalytic activity. Discoloration ratios of about 93.6% and 100% were reached after 15 min and 45 min, for CuO and ZnO respectively. Finally, an alternative photocatalysis mechanism, based purely on chemical reaction processes, is proposed. The photocatalysis results with modified powders are compared with the results obtained with thin films, made with the same materials.

Photocatalytic degradation of methylene blue from aqueous solutions using nanopillars-TiO2 thin films: Batch reactor studies

2018 ◽  
Vol 18 (3) ◽  
pp. 81-91 ◽  
Author(s):  
C. Lalhriatpuia
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Organic Carbon ◽  
Photocatalytic Degradation ◽  
Batch Reactor ◽  
Tio2 Thin Films ◽  
Initial Concentration ◽  
Bet Specific Surface Area ◽  
Interfering Ions

Nanopillars-TiO2 thin films was obtained on a borosilicate glass substrate with (S1) and without (S2) polyethylene glycol as template. The photocatalytic behaviour of S1 and S2 thin films was assessed inthe degradation of methylene blue (MB) dye from aqueous solution under batch reactor operations. The thin films were characterized by the SEM, XRD, FTIR and AFM analytical methods. BET specific surface area and pore sizes were also obtained. The XRD data confirmed that the TiO2 particles are in its anatase mineral phase. The SEM and AFM images indicated the catalyst is composed with nanosized pillars of TiO2, evenly distributed on the surface of the substrate. The BET specific surface area and pore sizes of S1 and S2 catalyst were found to be 5.217 and 1.420 m2/g and 7.77 and 4.16 nm respectively. The photocatalytic degradation of MB was well studied at wide range of physico-chemical parameters. The effect of solution pH (pH 4.0 to 10.0) and MB initial concentration (1.0 to 10.0 mg/L) was extensively studied and the effect of several interfering ions, i.e., cadmium nitrate, copper sulfate, zinc chloride, sodium chloride, sodium nitrate, sodium nitrite, glycine, oxalic acid and EDTA in the photocatalytic degradation of MB was demonstrated. The maximum percent removal of MB was observed at pH 8.0 beyond which it started decreasing and a low initial concentration of the pollutant highly favoured the photocatalytic degradation using thin films and the presence of several interfering ions diminished the photocatalytic activity of thin films to some extent. The overall photocatalytic activity was in the order: S2 > S1 > UV. The photocatalytic degradation of MB was followed the pseudo-first-order rate kinetics. The mineralization of MB was studied with total organic carbon measurement using the TOC (total organic carbon) analysis.

Use of Nanopillars-TiO2 Thin Films in the Photocatalytic Degradation of Bromophenol Blue from Aqueous Solution

2018 ◽  
Vol 6 (1) ◽  
pp. 22-30
Author(s):  
C. Lalhriatpuia ◽  
◽  
Thanhming liana ◽  
K. Vanlaldinpuia
Keyword(s):  
Thin Films ◽  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Batch Reactor ◽  
Bromophenol Blue ◽  
Tio2 Thin Films ◽  
Initial Concentration ◽  
Bet Specific Surface Area ◽  
Interfering Ions

The photocatalytic activity of Nanopillars-TiO2 thin films was assessed in the degradation of Bromophenol blue (BPB) dye from aqueous solution under batch reactor operations. The thin films were characterized by the XRD, SEM and AFM analytical methods. BET specific surface area and pore sizes were also obtained. The XRD data showed anatase phase of TiO2 particles with average particle size of 25.4 and 21.9 nm, for S1 and S2 catalysts respectively. The SEM and AFM images indicated the catalyst composed with Nanosized pillars of TiO2, evenly distributed on the surface of the substrate. The average height of the pillars was found to be 180 and 40 nm respectively for the S1 and S2 catalyst. The BET specific surface area and pore sizes of S1 and S2 catalyst were found to be 5.217 and 1.420 m2/g and 7.77 and 4.16 nm respectively. The photocatalytic degradation of BPB using the UV light was studied at wide range of physico-chemical parametric studies to determine the mechanism of degradation as well as the practical applicability of the technique. The batch reactor operations were conducted at varied pH (pH 4.0 to 10.0), BPB initial concentration (1.0 to 20.0 mg/L) and presence of several interfering ions, i.e., cadmium nitrate, copper sulfate, zinc chloride, sodium chloride, sodium nitrate, sodium nitrite, glycine, oxalic acid and EDTA in the photocatalytic degradation of BPB. The maximum percent removal of BPB was observed at pH 6.0 and a low initial concentration of the pollutant highly favours the photocatalytic degradation using thin films. The presence of several interfering ions suppressed the photocatalytic activity of thin films to some extent. The time dependence photocatalytic degradation of BPB was demonstrated with the pseudo-first-order rate kinetics. Study was further extended with total organic carbon measurement using the TOC (Total Organic Carbon) analysis. This demonstrated an apparent mineralization of BPB from aqueous solutions.

scholarly journals Copper-nanoparticle-dispersed amorphous BaTiO3 thin films as hole-trapping centers: enhanced photocatalytic activity and stability

RSC Advances ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 5045-5052 ◽  
Author(s):  
Su-Wei Zhang ◽  
Shun Li ◽  
Bo-Ping Zhang ◽  
Dongfang Yu ◽  
Zuotai Zhang ◽  
...  
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Copper Nanoparticle ◽  
Photoelectrochemical Performance ◽  
Hole Trapping ◽  
Degradation Activity ◽  
Trapping Centers

The photocatalytic degradation activity and photoelectrochemical performance of amorphous BaTiO3 films can be improved after introducing Cu NPs, and the oxidation of Cu is strongly hindered when dispersing in the amorphous BaTiO3 films that serve as h+-trapping centers.

scholarly journals Photocatalytic Activity of Ag-TiO2 Composites Deposited by Photoreduction under UV Irradiation

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Carlos Díaz-Uribe ◽  
Jose Viloria ◽  
Lorraine Cervantes ◽  
William Vallejo ◽  
Karen Navarro ◽  
...  
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Uv Irradiation ◽  
Ag Nanoparticles ◽  
Nitrate Solution ◽  
Physicochemical Characterization ◽  
Soda Lime Glass ◽  
X Ray

In this work, we synthesized Ag nanoparticles on TiO2 thin films deposited on soda lime glass substrates. Ag nanoparticles were synthesized by photoreduction under UV irradiation silver nitrate solution. X-ray diffraction, Raman spectroscopy, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) measurements were used for physicochemical characterization. The structural study showed that all samples were polycrystalline, main phases were anatase and rutile, and no additional signals were detected after surface modification. Raman spectroscopy suggested that silver aggregates deposited on the TiO2 films could exhibit the surface plasmon resonance (SPR) phenomenon; XPS and SEM analysis confirmed TiO2 film morphological modification after photoreduction process. Photocatalytic degradation of methylene blue (MB) was studied under UV irradiation in aqueous solution, and, besides, pseudo-first-order model was used to obtain kinetic information about photocatalytic degradation. Results indicated that Ag-TiO2 showed an important increase in photocatalytic activity under UV (from 20% to 35%); finally, Ag-TiO2 thin films had kapp value 2.4 × 10−3 ± 0.003 min−1 of 1.8 times greater than the kapp value 1.3 × 10−4 ± 0.0004 min−1 of TiO2 thin films.

scholarly journals Fast photocatalytic degradation of dyes using low-power laser-fabricated Cu2O–Cu nanocomposites

RSC Advances ◽  
2018 ◽  
Vol 8 (36) ◽  
pp. 20277-20286 ◽  
Author(s):  
Shengling Li ◽  
Qingxia Lin ◽  
Xianhua Liu ◽  
Li Yang ◽  
Jie Ding ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Low Power ◽  
Photocatalytic Degradation ◽  
Power Laser ◽  
Facile Synthesis ◽  
Degradation Of Dyes ◽  
Excellent Photocatalytic Activity

Facile synthesis of Cu2O–Cu nanocomposites by using a low-power CO2laser was realized, and the fabricated nanomaterials showed excellent photocatalytic activity for the degradation of various dyes.

Protoporphyrin IX functionalized α-Fe2O3 for enhanced photocatalytic and antimicrobial activity under sunlight

2019 ◽  
Vol 12 (06) ◽  
pp. 1950079 ◽  
Author(s):  
Rui Chen ◽  
Yabin Xie ◽  
Shuai Meng ◽  
Yan Yan ◽  
Qiang Yang ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Antimicrobial Activity ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Small Molecule ◽  
Protoporphyrin Ix ◽  
Free Electrons ◽  
Degradation Of Dyes ◽  
Novel Strategy ◽  
A Charge

As a novel strategy for improving the photocatalytic activity through hybrid with small molecule photosensitizer, [Formula: see text]-Fe2O3 has been successfully functionalized with protoporphyrin IX (PPIX) in order to enhance sunlight-driven photocatalytic degradation of dyes and antimicrobial activity due to the staggered energy band structures which promote a charge transfer between [Formula: see text]-Fe2O3 and PPIX and generate free holes and electrons. The results show that [Formula: see text]-Fe2O3 could absorb more sunlight and generate more free electrons and holes after being decorated with PPIX. As a result, PPIX-functionalized [Formula: see text]-Fe2O3 has an enhanced photocatalytic degradation of dyes ability against rhodamine B and methyl orange and antimicrobial activity against Escherichia coli. The present strategy gives a promising way to prepare photocatalytic agent hybrid with small molecule photosensitizer.

scholarly journals Synthesis of Nanoporous TiO2 Thin Films for Photocatalytic Degradation of Methylene Blue

2014 ◽  
Vol 17 (1) ◽  
pp. 023-028 ◽  
Author(s):  
M. Estrada ◽  
C. Reza ◽  
J. Salmones ◽  
J.A. Wang ◽  
M. E. Manríquez ◽  
...  
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Tio2 Films ◽  
Tio2 Thin Films ◽  
Direct Photolysis ◽  
Force Microscopy ◽  
Atomic Force ◽  
Surface Hydroxyls

This work reports a structure and photocatalytic activity of nanoporous titania (TiO2) thin films by an anodizing approach. Xray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscopy (AFM) studies showed that tetragonal anatase was the main phase in the thin films that consisted of countless disordered nanopores in the order of 10 to 15 nm. In the photocatalytic degradation of methylene blue, the titania thin films showed a good photocatalytic activity. 82.2 % methylene blue could be photodegraded by titania thin films with UV radiation. XPS results indicate that during the degradation of methylene blue, some Ti3+ may be partially oxidized to Ti4+ in the TiO2 films and the surface hydroxyls directly participate in the reaction. Our nanoporous titania thin films is commensurable to Degussa-25 TiO2 powders because the latter requires filtration in each treatment; it is also much superior to the direct photolysis approach with respect to photoactivity.

scholarly journals Photocatalytic degradation of dyes in water by analytical reagent grades ZnO, TiO<sub>2</sub> and SnO<sub>2</sub>: a comparative study

2017 ◽  
Vol 10 (2) ◽  
pp. 109-117 ◽  
Author(s):  
Dnyaneshwar R. Shinde ◽  
Popat S. Tambade ◽  
Manohar G. Chaskar ◽  
Kisan M. Gadave
Keyword(s):  
Photocatalytic Activity ◽  
Metal Oxides ◽  
Photocatalytic Degradation ◽  
Diffuse Reflectance Spectroscopy ◽  
Dye Degradation ◽  
Low Cost ◽  
Solar Irradiation ◽  
Degradation Of Dyes ◽  
Photocatalytic Activities ◽  
Analytical Reagent

Abstract. In this study, we evaluated the photocatalytic activities of analytical reagent (AR) grade ZnO, TiO2, and SnO2 to identify a low-cost photocatalyst for dye degradation. The obtained samples of ZnO, TiO2, and SnO2 were characterised by X-ray diffractogram (XRD), scanning electron microscope imaging, and UV-VIS diffuse reflectance spectroscopy. The decolourisation of three structurally diverse dyes, namely crystal violet, basic blue, and methyl red under solar irradiation, was used to evaluate the photocatalytic activities of three metal oxides. The photocatalytic activities of the received three metal oxides were tested with the photocatalytic degradation of dyes and compared with Degussa P-25. Dye solutions with each metal oxide at initial pH 9 were subjected to irradiation under sunlight and monitored for up to the stage of complete decolourisation. The results indicate that ZnO exhibited the highest photocatalytic activity as compared to TiO2 and SnO2 as well as that of Degussa P-25 (TiO2). The photocatalytic dye decolourisation rates with ZnO were 1.14–1.35, 1.70–3.1, and 4–8.5 times higher than those of the Degussa P-25, TiO2, and SnO2, respectively. The percentage COD removal was studied for ZnO and partial removal was observed at the decolourisation stage. To enhance photocatalytic activity of AR grade ZnO, it was loaded with Ag metal and about 20 % enhancement in the activity was observed.

Photocatalytic activity of cadmium doped TiO2 films for photocatalytic degradation of dyes

2009 ◽  
Vol 152 (1) ◽  
pp. 64-71 ◽  
Author(s):  
Luminita Andronic ◽  
Alexandru Enesca ◽  
Cristina Vladuta ◽  
Anca Duta
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Tio2 Films ◽  
Doped Tio2 ◽  
Degradation Of Dyes

Photocatalytic degradation of organic dyes by La3+/Ce3+-H3PW12O40 under different light irradiation

2014 ◽  
Vol 43 (24) ◽  
pp. 9061-9069 ◽  
Author(s):  
Taohai Li ◽  
Quanguo Li ◽  
Jing Yan ◽  
Feng Li
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Hydrothermal Method ◽  
Visible Light Irradiation ◽  
Organic Dyes ◽  
Light Irradiation ◽  
Highly Efficient ◽  
Degradation Of Dyes

La3+-H3PW12O40 and Ce3+-H3PW12O40 photocatalysts were synthesized by the PEG-1000 assisted hydrothermal method. These prepared photocatalysts exhibited highly efficient light-driven photocatalytic activity for the degradation of dyes (MO and RhB) under UV- and visible light irradiation.

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