Light-Induced Reactions of Chlorpromazine in the Presence of a Heterogeneous Photocatalyst: Formation of a Long-Lasting Sulfoxide

A commercial carbon-modified titanium dioxide, KRONOClean 7000, was applied as a UV(A) and visible-light active photocatalyst to investigate the conversion of the antipsychotic pharmaceutical chlorpromazine in aqueous phase employing two monochromatic light sources emitting at wavelengths of 365 and 455 nm. Photocatalytic and photolytic conversion of chlorpromazine under both anaerobic and aerobic conditions was analyzed using a HPLC-MS technique. Depending on the irradiation wavelength and presence of oxygen, varying conversion rates and intermediates revealing different reaction pathways were observed. Upon visible light irradiation under aerobic conditions, chlorpromazine was only converted in the presence of the photocatalyst. No photocatalytic conversion of this compound under anaerobic conditions upon visible light irradiation was observed. Upon UV(A) irradiation, chlorpromazine was successfully converted into its metabolites in both presence and absence of the photocatalyst. Most importantly, chlorpromazine sulfoxide, a very persistent metabolite of chlorpromazine, was produced throughout the photolytic and photocatalytic conversions of chlorpromazine under aerobic conditions. Chlorpromazine sulfoxide was found to be highly stable under visible light irradiation even in the presence of the photocatalyst. Heterogeneous photocatalysis under UV(A) irradiation resulted in a slow decrease of the sulfoxide concentration, however, the required irradiation time for its complete removal was found to be much longer compared to the removal of chlorpromazine at the same initial concentration.

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Photocatalytic Reduction of Aqueous Cr(VI) with CdS under Visible Light Irradiation: Effect of Particle Size

BULLETIN OF CHEMICAL REACTION ENGINEERING AND CATALYSIS ◽

10.9767/bcrec.12.1.593.62-70 ◽

2017 ◽

Vol 12 (1) ◽

pp. 62 ◽

Cited By ~ 6

Author(s):

A.B. Makama ◽

Ali Salmiaton ◽

Elias B. Saion ◽

T.S.Y. Choong ◽

N. Abdullah

Keyword(s):

Particle Size ◽

Visible Light ◽

Visible Light Irradiation ◽

Reduction Rate ◽

Heterogeneous Photocatalysis ◽

Photocatalytic Reduction ◽

Light Irradiation ◽

Irradiation Effect ◽

Particle Size Reduction ◽

Effect Of Particle Size

Stringent environmental standards have made the removal of Cr(VI) from water an important problem for environmental scientist and engineering. Heterogeneous photocatalysis using suspended photocatalyst is an interesting technique to consider for this application. In this work, the influence of particle size of suspended CdS on the photocatalytic reduction of aqueous Cr(VI) ion was investigated. The efficiency of Cr(VI) reduction was monitored through UV-visible analysis. The experimental results showed that the nanoparticle size has a dramatic effect on the adsorption and reduction of Cr(VI). As surface area increased from 44.2±0.6 to 98.7±0.5 m2/g due to particle size reduction, the rate of Cr(VI) reduction nearly doubled in the first 20 min of visible light irradiation. The results evidenced the inverse relationship between the apparent reduction rate constant and the CdS particle size. Conversely, the half-life (t1/2) period of the photocatalytic reduction has a direct relationship with CdS particle sizes. Copyright © 2017 BCREC GROUP. All rights reservedReceived: 14th July 2016; Revised: 11st October 2016; Accepted: 18th October 2016How to Cite: Makama, A.B., Salmiaton, A., Saion, E.B., Choong, T.S.Y., Abdullah, N. (2017). Photocatalytic Reduction of Aqueous Cr(VI) with CdS under Visible Light Irradiation: Effect of Particle Size. Bulletin of Chemical Reaction Engineering & Catalysis, 12(1): 62-70 (doi:10.9767/bcrec.12.1.593.62-70)Permalink/DOI: http://dx.doi.org/10.9767/bcrec.12.1.593.62-70

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Synthesis, characterization of Ag-doped CdS-WO2 nanocomposite and effects of photocatalytic degradation in RhB under visible light irradiation

10.21203/rs.3.rs-1228443/v1 ◽

2022 ◽

Author(s):

G. Roshini ◽

V. Sathish ◽

S. Manigandan ◽

A. Tamilarasi ◽

E. Priyanka

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Photocatalytic Performance ◽

Irradiation Time ◽

Light Irradiation ◽

X Ray Diffraction ◽

X Ray ◽

Ft Ir ◽

Ft Ir Spectroscopy

Abstract In this paper, the highly stable Ag/CdS-WO2 nanocomposite was fabricated by a facile and capping agent-free hydrothermal technique. The fabricated Ag doped CdS-WO2 nanocomposite were characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and UV-vis diffuse reflectance (DRS) spectroscopy. The photocatalytic performance of synthesized photocatalysts was evaluated for the photodegradation of rhodamine B (Rh B) under visible light irradiation (VLI). The parameters used for the optimization of the photocatalyst were pH, catalyst dose, oxidant dose, and irradiation time. Based on this, a possible reaction mechanism for the enhancement of photocatalytic activity of Ag/CdS-WO2 has been proposed. Hence, we have a tendency to believe it might be a promising material that may be used for the photodegradation of organic pollutants present in wastewater.

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Photooxygenation of alkenes by molecular oxygen in the presence of porphyrins and chlorin sensitizers under visible light irradiation

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424610002446 ◽

2010 ◽

Vol 14 (07) ◽

pp. 639-645 ◽

Cited By ~ 14

Author(s):

Mahdi Hajimohammadi ◽

Nasser Safari

Keyword(s):

Visible Light ◽

Molecular Oxygen ◽

Visible Light Irradiation ◽

Oxidation Products ◽

Light Irradiation ◽

Free Base ◽

Alkene Oxidation ◽

Conversion Rates

Photooxidation of alkenes by molecular oxygen and visible light in the presence of tetraphenylporphyrin (H2TPP) , tetramesitylporphyrin (H2TMP) , tetrakis pentafluorophenylporphyrin (H2TPFPP) and tetrakis(2,3-dimetoxyphenyl)porphyrin T(2,3-OMeP)P and metalloporphyrins such as ClFeTPP , ClMnTMP , ClMnTPP , ClMnTPFPP , ClCoTPP and ZnTPP has been performed. Photooxidation of alkenes with tetraphenylchlorin (H2TPC) as the sensitizer with visible light has also been studied. The conversion rates for alkene oxidation were in the order of free-base porphyrins > chlorin > metalloporphyrins. In the presence of NaN3/Na2SO3 the yield of oxidation products and conversion percentage is considerably reduced, confirming involvement of 1O2 in the mechanism.

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Achieving the enhanced photocatalytic degradation of ceftriaxone sodium using CdS-g-C3N4 nanocomposite under visible light irradiation: RSM modeling and optimization

10.21203/rs.3.rs-212164/v1 ◽

2021 ◽

Author(s):

Naime AttariKhasraghi ◽

Karim Zare ◽

Ali Mehrizad ◽

Nasser Modirshahla ◽

Mohammad Ali Behnajady

Keyword(s):

Electron Microscopy ◽

Visible Light ◽

Photocatalytic Degradation ◽

Visible Light Irradiation ◽

Irradiation Time ◽

Energy Levels ◽

Light Irradiation ◽

X Ray ◽

Ceftriaxone Sodium ◽

Operational Variables

Abstract In this research, the cadmium sulfide - graphite carbon nitride (CdS-g-C3N4) nanocomposite was synthesized and characterized by X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectrometer (EDX), and transmission electron microscopy (TEM) techniques. The photocatalytic activity of as-prepared nanocomposite was evaluated in the degradation of ceftriaxone sodium (CTX) antibiotic from aqueous solution under visible light irradiation. The influence of the operational variables such as the amount of photocatalyst (g/L), initial CTX concentration (mg/L), pH, and irradiation time (min) on the photodegradation process was investigated and optimized using response surface methodology (RSM) - central composite design (CCD) model. The maximum degradation percentage (92.55 %) was obtained in the optimal condition, including 0.06 g/L of CdS-g-C3N4 photocatalyst, 15 mg/L of CTX, pH= 10.5, and irradiation time = 81 min. The efficient photocatalytic performance of CdS-g-C3N4 nanocomposite is due to the appropriate alignment of energy levels between the CdS and g-C3N4, which synergistically impact the charge separation and the degradation efficiency of CTX. The kinetics of the photocatalytic degradation process was well described by Langmuir-Hinshelwood’s pseudo-first-order model (kapp = 0.0336 min-1).

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Antifungal Activity of TiO2/Ag Nanoparticles under Visible Light Irradiation

Indonesian Journal of Chemistry ◽

10.22146/ijc.49150 ◽

2020 ◽

Vol 21 (1) ◽

pp. 14

Author(s):

Nahzim Rahmat ◽

Endang Tri Wahyuni ◽

Adhitasari Suratman

Keyword(s):

Antifungal Activity ◽

Visible Light ◽

Visible Light Irradiation ◽

Ag Nanoparticles ◽

Irradiation Time ◽

Light Irradiation ◽

Diffusion Method ◽

Disc Diffusion ◽

Disc Diffusion Method ◽

Research Results

The doping of TiO2 by Ag(I) from [Ag(S2O3)2]3– contained in radiophotography wastewater by photoreduction method has been performed. TiO2/AgNPs photocatalyst was examined for its activity as an antifungal material for the inhibition of C. albicans in water under visible light irradiation. In the doping process, the weight of TiO2 was varied to obtain TiO2/AgNPs with different amounts of Ag. The TiO2/AgNPs samples were characterized by using FTIR, SRUV, TEM, SEM-EDX, and XRD methods. The antifungal test was carried out by disc diffusion method under visible light irradiation, wherein the amount of Ag-doped on TiO2, the dose of TiO2/AgNPs, and the irradiation time were optimized. The research results indicated that the antifungal activity of TiO2/AgNPs in inhibiting C. albicans has been successfully prepared. The highest inhibition was achieved by using 0.5 g/L of TiO2/AgNPs (I), at 5 h of irradiation time.

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Photodegradation of p-cresol in Aqueous Mn(1%)-Doped ZnO Suspensions

Journal of Advanced Oxidation Technologies ◽

10.1515/jaots-2012-0116 ◽

2012 ◽

Vol 15 (1) ◽

Cited By ~ 1

Author(s):

Yadollah Abdollahi ◽

Abdul Halim Abdullah ◽

Azmi Zakaria ◽

Zulkarnain Zainal ◽

Hamid Reza Fard Masoumi ◽

...

Keyword(s):

Organic Carbon ◽

Visible Light ◽

Total Organic Carbon ◽

Visible Light Irradiation ◽

Photocatalytic Performance ◽

Irradiation Time ◽

Light Irradiation ◽

Uv Visible ◽

Doped Zno ◽

Mn Doped

AbstractPhotodegradation of p-cresol was carried out by a 1.0wt% Mn doped ZnO under visible light irradiation. The amount of photocatalyst, concentration of p-cresol and pH were studied as variables. The residue of p-cresol and mineralisation was measured using a UV-visible spectrophotometer and TOC analyzer, respectively. The intermediate was detected by UPLC. The results showed the amount of photocatalyst and concentration of p-cresol was 1.5g/L and 35 ppm respectively. P-cresol photodegradation was favorable in the pH 6-9 range. The detected intermediate was 4-hydroxy-benzaldehyde. TOC studies show that 74% of total organic carbon was removed from solution during irradiation time. Reusability shows no significant reduction in photocatalytic performance in photodegrading p-cresol. This study indicates that 1.0 wt% Mn doped ZnO can remove p-cresol from wastewater under visible light irradiation, and being more economic than UV irradiation could be applied on an industrial scale.

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Evaluation of solar light inactivation on multidrug-resistant Escherichia coli CGMCC 1.1595

Water Science & Technology Water Supply ◽

10.2166/ws.2020.124 ◽

2020 ◽

Vol 20 (6) ◽

pp. 2216-2225

Author(s):

Xiu-Feng Yin ◽

Na Shi ◽

Ting Meng ◽

Ying-Xue Sun

Keyword(s):

Escherichia Coli ◽

Light Intensity ◽

Visible Light ◽

Visible Light Irradiation ◽

Irradiation Time ◽

Multidrug Resistant ◽

Light Irradiation ◽

Solar Light ◽

E Coli ◽

Inactivation Efficiency

Abstract This study investigated the simulated solar light disinfection of Escherichia coli CGMCC 1.1595, a multidrug-resistant (MDR) strain resistant to tetracycline and ampicillin. With the increase of light intensity, the maximum inactivation efficiency reached 0.74 log in 60 min following visible light irradiation with an intensity of 115.8 mW/cm2 and following UVA–visible light irradiation, using a 98% UVA-ray contribution at 6.5 mW/cm2 and 95% contribution at 20.0 mW/cm2, the inactivation efficiency was up to 6.09 log. The inactivated MDR E. coli did not regrow after light irradiation or in the dark after 24 or 48 h after visible light disinfection, demonstrating that visible light disinfection can prevent MDR E. coli self-repair. The MDR E. coli plasmid electrophoresis band gradually went dark with increase of the light irradiation time and could be completely eliminated by high UVA light intensity treatment, however, simulated sunlight irradiation had minimal influence on both tetracycline and ampicillin resistance of the MDR E. coli strain.

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Photosensitization of Ruthenium(II) Complex on Titania for Photocatalytic H2 Evolution Under Visible-Light Irradiation

Volume 12: Mechanics of Solids, Structures and Fluids ◽

10.1115/imece2008-69172 ◽

2008 ◽

Author(s):

Tianyou Peng ◽

Ke Dai ◽

Huabing Yi ◽

Dingning Ke ◽

Ping Cai

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Dynamic Equilibrium ◽

Irradiation Time ◽

Light Irradiation ◽

H2 Evolution ◽

Conjugation System ◽

Antenna Effect ◽

Dye Sensitized ◽

Photocatalytic H2 Evolution

Hydrogen production over dye-sensitized Pt/P25 under visible-light irradiation was investigated by using methanol or TEOA as an electron donor. The binuclear Ru(II) dye (Ru2(bpy)4L1-PF6) shows the best photosensitization in both sacrificial reagent solutions due to its larger conjugation system and “antenna effect”, which is loosely linked with TiO2 and exhibits more steady and higher increases in H2 evolution upon prolonging the irradiation time in comparison with the tightly linked N719. The dynamic equilibrium between the linkage of ground dye and divorce of oxidized dye from TiO2 can enhance the electron injection and hinder the backward transfer, and then improve the H2 evolution efficiency.

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Controllable Synthesis and Photocatalytic Properties of C-doped BiVO4 with Self-Heterostructure Under Different Light Sources

NANO ◽

10.1142/s1793292015500083 ◽

2015 ◽

Vol 10 (01) ◽

pp. 1550008 ◽

Cited By ~ 4

Author(s):

Yong Wang ◽

Jianfeng Huang ◽

Guoqiang Tan ◽

Jing Huang ◽

Lili Zhang

Keyword(s):

Visible Light ◽

Ultraviolet Light ◽

Visible Light Irradiation ◽

Photophysical Properties ◽

Photocatalytic Property ◽

Light Irradiation ◽

Photocatalytic Properties ◽

Light Sources ◽

Monoclinic Structure ◽

Hydrothermal Route

C -doped BiVO 4 with self-heterostructure were synthesized via a facile one-step microwave-hydrothermal route at different reaction temperatures and reaction times. The crystal structure, morphology and photophysical properties of the samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM) and UV-Vis techniques. The photocatalytic properties of the samples were evaluated by the decolorization of rhodamine B under ultraviolet light or simulated visible light irradiation. It was found that pure BiVO 4 polyhedrons had a monoclinic structure while C -doped BiVO 4 had self-heterostructure with both monoclinic and tetragonal phase. This mixed-phase structure exhibited higher activity than monoclinic structure under ultraviolet light irradiation while monoclinic C -doped BiVO 4 had better photocatalytic property under simulated visible light irradiation. The selectivity of the light source with different C -doped BiVO 4 self-heterostructures was also discussed in this work.

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Synthesis, Property Characterization, and Photocatalytic Activity of Novel Visible Light-Responsive Photocatalyst

International Journal of Photoenergy ◽

10.1155/2012/301954 ◽

2012 ◽

Vol 2012 ◽

pp. 1-11 ◽

Cited By ~ 5

Author(s):

Jingfei Luan ◽

Zhitian Hu

Keyword(s):

Visible Light ◽

Photocatalytic Degradation ◽

Visible Light Irradiation ◽

Textile Industry ◽

Complete Removal ◽

Order Rate Constant ◽

Solid State Reaction Method ◽

Lattice Parameter ◽

Light Irradiation ◽

First Order

Fe2BiSbO7was synthesized by a solid-state reaction method for the first time. The structural and photocatalytic properties of Fe2BiSbO7have been characterized. The results showed that Fe2BiSbO7was crystallized with the pyrochlore-type structure, cubic crystal system, and space groupFd3m. The lattice parameter for Fe2BiSbO7was Å. The photocatalytic degradation of methylene blue (MB) was realized under visible light irradiation with Fe2BiSbO7as catalyst. Fe2BiSbO7owned higher catalytic activity compared with Bi2InTaO7or pure TiO2or N-doped TiO2for photocatalytic degradation of MB. The photocatalytic degradation of MB with Fe2BiSbO7, Bi2InTaO7, or N-doped TiO2followed the first-order reaction kinetics, and the first-order rate constant was 0.01189, 0.00275, or 0.00333 min−1. After visible light irradiation for 230 min with Fe2BiSbO7, complete removal and mineralization of MB was observed. The reduction of the total organic carbon, the formation of inorganic products, and , and the evolution of CO2revealed the continuous mineralization of MB during the photocatalytic process. The photocatalytic degradation pathway of MB was obtained. Fe2BiSbO7/(visible light) photocatalysis system was found to be suitable for textile industry wastewater treatment.

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