Recovery of palladium (II) from aqueous solution through photocatalytic deposition in presence of ZnO under UV/Visible-light radiation

2021 ◽  
pp. 106523
Author(s):  
Marica Muscetta ◽  
Roberto Andreozzi ◽  
Raffaele Marotta ◽  
Ilaria Di Somma
Keyword(s):  
Aqueous Solution ◽  
Visible Light ◽  
Light Radiation ◽  
Uv Visible

Photocatalytic degradation and pathway of oxytetracycline in aqueous solution by Fe2O3–TiO2 nanopowder

RSC Advances ◽  
2015 ◽  
Vol 5 (51) ◽  
pp. 40764-40771 ◽  
Author(s):  
Rong Li ◽  
Yuefa Jia ◽  
Jun Wu ◽  
Qiang Zhen
Keyword(s):  
Aqueous Solution ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Uv Visible ◽  
Tio2 Nanopowder

After photocatalytic degradation under UV/visible light by Fe2O3/TiO2 composites, the naphthol ring of oxytetracycline (C22H24N2O9) destructed to a partial ring-ruptured structure, such as C9H6O4.

Synthesis of Ethyl Cellulose-Based Thermal- and Photodual- Responsive Copolymer via ATRP and their Aggregates in Aqueous Solution

2010 ◽  
Vol 663-665 ◽  
pp. 952-955
Author(s):  
Xin De Tang ◽  
De Jie Zhou ◽  
Nian Feng Han
Keyword(s):  
Aqueous Solution ◽  
Visible Light ◽  
Ethyl Cellulose ◽  
Room Temperature ◽  
Catalyst System ◽  
Polymerization Temperature ◽  
Water Mixture ◽  
Stable Suspension ◽  
Uv Visible ◽  
Hexyl Methacrylate

Ethyl cellulose-graft-poly(N-isopropylacrylamide-co-6-[4-(4-ethoxyphenylazo)phenoxy] hexyl methacrylate) (EC-g-P(NIPAM-co-MAZO)) were synthesized through atom transfer radical polymerization (ATRP). Ethyl cellulose-based macroinitiator was prepared by direct acrylation of ethyl cellulose with excess 2-bromoisobutyryl bromide at room temperature, the bromo-ester groups of which were known to be efficient initiator for ATRP. Statistical copolymerization of N-isopropylacrylamide (NIPAM) and 6-[4-(4-ethoxyphenylazo)phenoxy] hexyl methacrylate (MAZO) onto ethyl cellulose (EC) was achieved using CuCl/Me6TREN as the catalyst system and N,N-dimethylformamide/water mixture (DMF/H2O, v/v = 4:1) as solvent. Appropriate solvent concentration and polymerization temperature can minimize the intermolecular coupling and render the polymerization controllable. The aggregates formed by EC-g-P (NIPAM-co-MAZO) copolymer in aqueous solution were investigated by varying temperature and irradiation under UV/visible light. The results indicated that the copolymer had thermal- and photo- dual-responsive properties. The copolymer formed a comparatively stable suspension in water at room temperature and underwent a hydrophilic-hydrophobic transition when the temperature raised. Furthermore, their aggregates in water were influenced by isomerization of azobenzene groups under UV/visible light irradiation.

scholarly journals Photocatalytic Degradation of Commercial Diazinon Pesticide Using C,N-codoped TiO2 as Photocatalyst

2020 ◽  
Vol 20 (3) ◽  
pp. 587
Author(s):  
Khoiriah Khoiriah ◽  
Diana Vanda Wellia ◽  
Jarnuzi Gunlazuardi ◽  
Safni Safni
Keyword(s):  
Aqueous Solution ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Catalyst Concentration ◽  
Irradiation Time ◽  
Low Energy ◽  
Initial Concentration ◽  
Codoped Tio2 ◽  
Initial Ph ◽  
Uv Visible

Diazinon (C12H21N2O3PS) is an effective pest controller that has been frequently used by farmers in agriculture. It is a nonspecific and highly toxic pesticide having low persistence in the environment and categorized as moderately hazardous class II. The degradation of commercial diazinon in aqueous solution was investigated by photocatalysis using low-energy activated C,N-codoped TiO2 as catalyst under visible-light. The influence of some parameters, i.e., catalyst concentration, the initial concentration of diazinon, initial pH of diazinon, and irradiation time on the diazinon degradation was studied. The amount of diazinon degradation was strongly influenced by all the above parameters. The results show that titania-modified enhanced the degradation percentage of diazinon, from 44.08% without a catalyst to 86.93% by adding 12 mg C,N-codoped TiO2 catalyst after 30 minutes visible-light irradiation. UV-visible spectrophotometer, HPLC, and COD analysis verified that diazinon was successfully degraded under photocatalysis visible.

Kinetics of Humic Acids Photodegradation in Aqueous Solution Using TiO2/ ZnO/Co Composite Photocatalyst

2019 ◽  
Vol 962 ◽  
pp. 117-121
Author(s):  
Muhammad Ali Zulfikar ◽  
Dira Irnameria ◽  
Muhamad Nasir
Keyword(s):  
Aqueous Solution ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Degradation Rate ◽  
Light Irradiation ◽  
Organic Substances ◽  
Composite Photocatalyst ◽  
Taste And Odor ◽  
Uv Visible ◽  
Kinetics Of

Humic acid (HA) is a major component of natural organic substances and affects water quality, such as color, taste and odor. Therefore, removal of HA from surface water or wastewater is very important. In this paper, the photodegradation kinetics of these compounds using TiO2/ZnO/Co composite photocatalyst under visible light irradiation was investigated. The progress of photocatalytic degradation of the HA has been observed by measuring the absorbance in UV-Visible spectrophotometer. The results reveal that the TiO2/ZnO/Co composite photocatalyst exhibits much better photocatalytic activity than those of pure TiO2 and TiO2/ZnO on photodegradation of HA under visible light irradiation, with degradation rate constants were found 0.0163, 0.0079 and 0.0032 (min-1), respectively.

scholarly journals A Novel Thiosemicarbazide-Based Fluorescent Chemosensor for Hypochlorite in Near-Perfect Aqueous Solution and Zebrafish

Chemosensors ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 65
Author(s):  
Minji Lee ◽  
Donghwan Choe ◽  
Soyoung Park ◽  
Hyeongjin Kim ◽  
Soomin Jeong ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Reactive Oxygen Species ◽  
Aqueous Solution ◽  
Fluorescence Quenching ◽  
Limit Of Detection ◽  
Fluorescent Sensor ◽  
Ionization Mass ◽  
Oxygen Species ◽  
Marked Selectivity ◽  
Uv Visible

A novel thiosemicarbazide-based fluorescent sensor (AFC) was developed. It was successfully applied to detect hypochlorite (ClO−) with fluorescence quenching in bis-tris buffer. The limit of detection of AFC for ClO− was analyzed to be 58.7 μM. Importantly, AFC could be employed as an efficient and practical fluorescent sensor for ClO− in water sample and zebrafish. Moreover, AFC showed a marked selectivity to ClO− over varied competitive analytes with reactive oxygen species. The detection process of AFC to ClO− was illustrated by UV–visible and fluorescent spectroscopy and electrospray ionization–mass spectrometry (ESI–MS).

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