scholarly journals Photocatalytic Degradation of Ampicillin Using PLA/TiO2 Hybrid Nanofibers Coated on Different Types of Fiberglass

Water ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 176 ◽  
Author(s):  
Constantin Bobirică ◽  
Liliana Bobirică ◽  
Maria Râpă ◽  
Ecaterina Matei ◽  
Andra Mihaela Predescu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Photocatalytic Degradation ◽  
Kinetic Studies ◽  
Electrospinning Technique ◽  
Edge Type ◽  
Photocatalytic Reactor ◽  
Hybrid Nanofibers ◽  
Different Types ◽  
Fiberglass Fabric

New photocatalytic membranes based on polylactic acid (PLA)/TiO2 hybrid nanofibers deposited on fiberglass supports were prepared and tested for the removal of ampicillin from aqueous solutions. The electrospinning technique was used to obtain hybrid nanofibers that were deposited on three types of fiberglass with different structures, resulting in three distinct photocatalytic membranes namely fiberglass fabric plain woven-type membrane, fiberglass mat-type membrane, and fiberglass fabric one-fold edge-type membrane. The results of the photocatalytic tests showed that the highest efficiency of ampicillin removal from aqueous solution is obtained with the fiberglass fabric plain woven-type membrane. Although it has been shown that the rate of photocatalytic degradation of ampicillin is high, being practically eliminated within the first 30 min of photocatalysis, the degree of mineralization of the aqueous solution is low even after two hours of photocatalysis due to the degradation of PLA from the photocatalytic membrane. The instability of PLA in the reactive environment of the photocatalytic reactor, evidenced by morphological, mineralogical and spectroscopic analyzes as well as by kinetic studies, is closely related to the structure of the fiberglass membrane used as a support for PLA/TiO2 hybrid nanofibers.

scholarly journals Rates and equilibrium constants for the covalent hydration of 5-bromo-2(1H)-pyrimidinone in aqueous solution

1986 ◽  
Vol 64 (6) ◽  
pp. 1267-1272 ◽  
Author(s):  
Oswald S. Tee ◽  
Jana Pika ◽  
M. Judith Kornblatt ◽  
Michael Trani
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Title Compound ◽  
Equilibrium Constants ◽  
Kinetic Studies ◽  
Kinetics Of

The kinetics of bromination of the title compound (1) have been measured in aqueous solutions of pH 0–6. The change in the order of reaction which occurs around pH 2.5 is explained by 1 reacting via its covalent hydrate, 3. Furthermore, there is sufficient 3 present at equilibrium that the kinetics of its equilibration with 1 were also measured. From these two studies the extent of covalent hydration of 1 is estimated to be 5%.Kinetic studies of the bromination of the dimethyl cation 5 and of its equilibration with the pseudobase 6 were also carried out for the purposes of comparison.The present results for 1, 3, 5, and 6 are compared to earlier results for 2-pyrimidinone and analogous derivatives.

scholarly journals Comparison between the photocatalytic degradation of single and binary azo dyes in TiO2 suspensions under solar light irradiation

2015 ◽  
Vol 5 (4) ◽  
pp. 579-591 ◽  
Author(s):  
Ohm-Mar Min ◽  
Li-Ngee Ho ◽  
Soon-An Ong ◽  
Yee-Shian Wong
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Photocatalytic Degradation ◽  
Azo Dyes ◽  
Azo Dye ◽  
Oxygen Demand ◽  
Light Irradiation ◽  
Solar Light ◽  
Acid Orange 7 ◽  
Solar Light Irradiation

Textile industries discharge a large quantity of colored wastewater which is harmful to the ecosystem. In this study, two kinds of dyes were investigated: the mono azo Acid Orange 7 (AO7) and diazo Reactive Green 19 (RG19). The photocatalytic degradation of single (AO7, RG19) azo dye and binary (AO7 and RG19 mixture) azo dye aqueous solutions was photocatalyzed by commercial titanium dioxide (TiO2, P25) under solar light irradiation. The objectives of this study are to compare the photocatalytic degradation between single and binary azo dye aqueous solution and to study the various parameters such as the effect of different initial azo dye concentrations, different initial azo dye pH values, and compare the adsorption capacity of azo dyes with and without solar light irradiation, which influences the photocatalytic activities of single and binary azo dye aqueous solutions in a TiO2 suspension. The results showed that photocatalytic degradation of AO7 and RG19 in a single azo dye aqueous solution was faster than a binary azo dye solution under the solar light irradiation process. Chemical oxygen demand results revealed that complete mineralization could be achieved for both AO7 and RG19 azo dyes under solar light irradiation within 22 hours.

Modeling the Diffusion Mechanism and the Reaction Kinetics for the Photocatalytic Degradation of Acid Red 151 Aqueous Solutions by ZnO: Comparison of Linear and Non-Linear Methods

2007 ◽  
Vol 10 (2) ◽  
Author(s):  
K. Vasanth Kumar ◽  
K. Porkodi
Keyword(s):  
Aqueous Solution ◽  
Diffusion Coefficient ◽  
Aqueous Solutions ◽  
Photocatalytic Degradation ◽  
Reaction Kinetics ◽  
Diffusion Mechanism ◽  
Batch Processes ◽  
Average Diffusion Coefficient ◽  
Diffusion Controlled ◽  
Average Diffusion

AbstractBatch processes were carried out for the photocatalytic degradation of Acid Red 151 from its aqueous solution using ZnO catalyst at different initial dye concentrations. The process was found to be diffusion controlled for the first 15-20 minutes (before irradiation) with an average diffusion coefficient of 6.759 × 10

Fixed bed adsorption of diquat dibromide from aqueous solution using carbon nanotubes

RSC Advances ◽  
2015 ◽  
Vol 5 (76) ◽  
pp. 61508-61512 ◽  
Author(s):  
Anthony B. Dichiara ◽  
Samuel F. Harlander ◽  
Reginald E. Rogers
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Wastewater Treatment ◽  
Aqueous Solutions ◽  
Fixed Bed ◽  
Fixed Bed Column ◽  
Fixed Bed Adsorption ◽  
Different Types

Carbon nanotubes are increasingly studied as attractive adsorbents for wastewater treatment. The present work exploits the attributes of different types of CNTs in a fixed bed column for the dynamic uptake of diquat dibromide from aqueous solutions.

scholarly journals Use of fly ash and fly ash agglomerates for As(III) adsorption from aqueous solution

2014 ◽  
Vol 16 (1) ◽  
pp. 21-27 ◽  
Author(s):  
Justyna Ulatowska ◽  
Izabela Polowczyk ◽  
Wojciech Sawiński ◽  
Anna Bastrzyk ◽  
Tomasz Koźlecki ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Aqueous Solutions ◽  
Thermodynamic Parameters ◽  
Kinetic Studies ◽  
Second Order ◽  
Isotherm Models ◽  
Pseudo Second Order ◽  
Chemisorption Model

Abstract The objective of the present study is to assess the efficiency of fly ash and fly ash agglomerates to remove arsenic(III) from aqueous solution. The maximum static uptakes were achieved to be 13.5 and 5.7 mgAs(III)/adsorbent for nonagglomerated material and agglomerated one, respectively. Isotherm studies showed good fit with the Langmuir (fly ash) and the Freundlich (fly ash agglomerates) isotherm models. Kinetic studies indicated that the sorption of arsenic on fly ash and its agglomerates follows the pseudo-second-order (PSO) chemisorption model (R2 = 0.999). Thermodynamic parameters revealed an endothermic nature of As(III) adsorption on such adsorbents. The adsorption results confirmed that fly ash and its agglomerates can be used for As(III) removal from aqueous solutions. Fly ash can adsorb more arsenic(III) than agglomerates, which are easier to use, because this material is less dusty and easier to separate from solution.

scholarly journals Photocatalytic degradation of Bisphenol A: Kinetic studies and determination of the reaction pathway

2018 ◽  
Vol 16 (5) ◽  
Author(s):  
Luis F. Garay Rodríguez ◽  
Brenda Zermeño ◽  
Karla Alejandra López De la O ◽  
Elisa Leyva ◽  
Edgar Moctezuma
Keyword(s):  
Aqueous Solutions ◽  
Photocatalytic Degradation ◽  
Reaction Rate ◽  
Reaction Pathway ◽  
Batch Reactor ◽  
Analytical Techniques ◽  
Kinetic Studies ◽  
Degradation Process ◽  
Reaction Products ◽  
Uv Lamps

The photocatalytic degradation of BPA aqueous solutions with commercial TiO2 (Evonik P25) was carried out in a home-made batch reactor illuminated with four UV lamps (λmax= 365 nm) in order to determine the kinetic parameters of the reaction rate equation and to identify and quantify some of the most stable aromatic intermediate reaction products. Low concentration (20 ppm) BPA solutions were completely degraded and mineralized in less than three hours of reaction. Whereas, BPA aqueous solutions with concentration above 50 ppm are transformed in other chemical compounds in 6 hours of reaction and fully mineralized in 15 hours of reaction. Kinetic analysis of the experimental results of BPA concentration as a function of time indicated that this photocatalytic degradation process follows a LH-HW reaction rate law where the reaction order shift from zero order to first order as the reactant concentration is decreased. Analysis of the reaction samples by different analytical techniques indicated that BPA is mineralized via formation of hydroquinone, benzoquinone, benzene-triol, catechol, and phenol by two simultaneous reaction pathways.

scholarly journals ACTIVATED CARBON FABRICATED FROM VIETNAMESE SUGARCANE BAGASSE FOR REMOVAL OF CIPROFLOXACIN FROM AQUEOUS SOLUTION: PREPARATION, CHARACTERIZATION AND KINETIC STUDIES

2020 ◽  
Vol 58 (5A) ◽  
pp. 170
Author(s):  
Bạch Long Giang ◽  
Lam Van Tan ◽  
To-Uyen T. Dao ◽  
Hong-Tham T Nguyen ◽  
Trinh Duy Nguyen
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Aqueous Solutions ◽  
Sugarcane Bagasse ◽  
Ph Value ◽  
Agricultural Waste ◽  
Analytical Techniques ◽  
Kinetic Studies ◽  
Kinetic Mechanism ◽  
High Porosity

Recent interest in wastewater treatment has shifted to the use of agricultural waste to treat antibiotics in aqueous solutions due the economic efficiency the technique brings. This study focuses on the synthesis, properties and study of the kinetic mechanism of activated carbon and its potential application to remove antibiotics from aqueous solutions. Activated carbon is synthesized from sugarcane bagasse by activated method with active substance of ZnCl2. With a specific surface area of about 980.84 m2/g and high porosity, the product could absorb a large amount of ciprofloxacin (CIP) antibiotics. The properties of materials are characterized by relevant analytical techniques such as scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Brunauer-Emmett-Teller (BET). The behavior of CIP adsorption was studied under the effect of adsorption dose, initial CIP concentration and pH value. The adsorption and isothermal mechanisms are also studied. The results show that the adsorption adhered to the second kinetic model and the experimental data was found to be reasonably fitted to the Langmuir isotherm. Therefore, activated carbon manufactured from sugarcane bagasse could be used as a potential adsorbent to effectively remove antibiotics from aqueous solution.

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