scholarly journals Removal of aqueous organic pollutant by photo-Fenton process using low-cost Fe3O4/zeolite A

2021 ◽  
Vol 947 (1) ◽  
pp. 012013
Author(s):  
Ho Gia Quynh ◽  
Nguyen Anh Kiet ◽  
Huynh Van Thanh ◽  
Ta Man Tue ◽  
Nguyen Thi Truc Phuong ◽  
...  
Keyword(s):  
Textile Industry ◽  
Fenton Reaction ◽  
Low Cost ◽  
Organic Pollutant ◽  
Impregnation Method ◽  
Zeolite A ◽  
X Ray Diffraction ◽  
Initial Concentration ◽  
The Stability ◽  
Uv Lamps

Abstract Degradation of methylene blue (MB) in textile water treatment was investigated by using the photo - Fenton method (mixture of Fe2+ and H2O2 with the UV irradiation) in the presence of nano-sized and low-cost catalyst Fe3O4/Zeolite A. This catalyst was synthesized by impregnation method; furthermore, its photo – catalytic performances and durability in heterogeneous Fenton system were evaluated. Both the structure and the physical chemistry properties of the photocatalyst was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM). The study investigated the influences of different parameters of the MB decolorization efficiency such as initial concentration of peroxide attending the Fenton reaction, amounts of catalyst, pH of the dye solution and comparison of utilization of H2O2 in two cases with and without UV lamps. Under the optimum conditions which is the initial concentration of MB is 50 ppm and pH of dye solution is 3, high efficiencies of degradation were achieved – performance of 92.49%. These results suggest that the low-cost nanostructure catalyst Fe3O4/Zeolite A may be the considerable option because of the durability and the stability in the photo – Fenton reaction for organic wastewater treatment in textile industry.

Research on Foam’s Carrying Capacity of Two Types of nZVI

2017 ◽  
Vol 744 ◽  
pp. 536-541 ◽  
Author(s):  
Lan Xiang Shi ◽  
Jia Jun Chen ◽  
Meng Wei ◽  
Yun Song Liu
Keyword(s):  
Carrying Capacity ◽  
Environmental Remediation ◽  
Organic Pollutant ◽  
Zero Valent Iron ◽  
Precipitation Method ◽  
Sweep Efficiency ◽  
Experimental Conditions ◽  
Initial Concentration ◽  
Nanoscale Zero Valent Iron ◽  
The Stability

Special physical and chemical properties of nanoscale zero valent iron (nZVI), such as small particle size and high reactivity, make it a good choice as a remediation agent. nZVI is widely used in the remediation of various contaminants, including heavy metals and persistent organic pollutant. However, the immobilization of nanoparticles in porous medium limits the application in soil environmental remediation. Foam instead of water is used as the carrier of nanoparticles in in-site soil remediation process, which is a new idea, to improve sweep efficiency of nanoparticles. In this paper, the foam’s carrying ability of two types of nanoscale zero valent iron is studied. One of nZVI is purchased from a reagent Company, the other one is obtained by chemical precipitation method. In addition, the influence factors, the type and concentration of surfactant, foam quality and the initial concentration of nZVI are also discussed. The results demonstrate that foam has a 73% carrying capacity of nZVI-M, while much less capacity (33%) of nZVI-P under certain conditions. Surfactant can be used as dispersant to improve the stability of nZVI suspension. Besides, nZVI has no significant effect on the stability of foam, which provide the premise for foam as carrier. Influencing degree of these factors followed the order of the surfactant type > surfactant concentration > initial concentration of nZVI > foam quality under the experimental conditions.

scholarly journals Dry Reforming of Methane Using Ce-modified Ni Supported on 8%PO4 + ZrO2 Catalysts

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 242
Author(s):  
Ahmed A. Ibrahim ◽  
Ahmed S. Al-Fatesh ◽  
Nadavala Siva Kumar ◽  
Ahmed E. Abasaeed ◽  
Samsudeen O. Kasim ◽  
...  
Keyword(s):  
Space Velocity ◽  
Catalyst System ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
Temperature Programmed Oxidation ◽  
Active Metal ◽  
Temperature Programmed ◽  
The Stability

Dry reforming of methane (DRM) was studied in the light of Ni supported on 8%PO4 + ZrO2 catalysts. Cerium was used to modify the Ni active metal. Different percentage loadings of Ce (1%, 1.5%, 2%, 2.5%, 3%, and 5%) were tested. The wet incipient impregnation method was used for the preparation of all catalysts. The catalysts were activated at 700 °C for ½ h. The reactions were performed at 800 °C using a gas hourly space velocity of 28,000 mL (h·gcat)−1. X-ray diffraction (XRD), N2 physisorption, hydrogen temperature programmed reduction (H2-TPR), temperature programmed oxidation (TPO), temperature programmed desorption (TPD), and thermogravimetric analysis (TGA) were used for characterizing the catalysts. The TGA analysis depicted minor amounts of carbon deposition. The CO2-TPD results showed that Ce enhanced the basicity of the catalysts. The 3% Ce loading possessed the highest surface area, the largest pore volume, and the greatest pore diameter. All the promoted catalysts enhanced the conversions of CH4 and CO2. Among the promoted catalysts tested, the 10Ni + 3%Ce/8%PO4 + ZrO2 catalyst system operated at 1 bar and at 800 °C gave the highest conversions of CH4 (95%) and CO2 (96%). The stability profile of Cerium-modified catalysts (10%Ni/8%PO4 + ZrO2) depicted steady CH4 and CO2 conversions during the 7.5 h time on stream.

Study of the stability of lead halide perovskite under two different fluoropolymer top coatings

MRS Advances ◽  
2020 ◽  
Vol 5 (8-9) ◽  
pp. 377-383 ◽  
Author(s):  
Fatemeh Khorramshahi ◽  
Arash Takshi
Keyword(s):  
Indium Tin Oxide ◽  
Low Cost ◽  
Flexible Substrate ◽  
Laser Source ◽  
Self Healing ◽  
X Ray Diffraction ◽  
Step Method ◽  
Halide Perovskite ◽  
The Stability ◽  
Lead Halide

AbstractIn this work, lead halide perovskite photodetectors were fabricated by a laser-assisted rapid fabrication method. A microchannel was engraved on an indium tin oxide (ITO) coated polyethylene terephthalate (PET) conductive flexible substrate using a CO2 laser source. The channels were filled by methylammonium lead halide perovskite (CH3NH3PbI3) using the capillary motion of perovskite first-step method precursor. CYTOP and the low-cost commercially available FluroPel were used as a top protective coating layer to suppress the decomposition of the perovskite channel. X-ray diffraction pattern (XRD) was used to measure the stability of the perovskite. Strong humidity resistant and self-healing behavior were observed in both devices. The performance of the photodetectors was compared by measuring electrical and optical characteristics over time. This study will help in the low-cost fabrication of perovskite-based devices.

Preparation of Pd/GO/Cu Electrode and Its Electrochemical Degradation for 2,4-Dichlorophenol

2020 ◽  
Vol 20 (6) ◽  
pp. 3604-3609
Author(s):  
Jian Zhang ◽  
Yuting Jiang ◽  
Bing Wang ◽  
Lanhe Zhang ◽  
Zheng Li ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Water Environment ◽  
Constant Current ◽  
Surface Element ◽  
Impregnation Method ◽  
Electrochemical Degradation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Preparation Conditions ◽  
The Stability

Chlorinated aromatic compounds (CACs) are a class of persistent organic pollutants, which have serious damage to water environment due to their own stable structure. But a good many of CACs were abandoned because of their tremendous yields and wide applications, so it is urgent to find the effective degradation methods for CACs. The electrochemical method is supposed to be a simple, environmentally friendly and effective pathway to degrade CACs. In this paper, a Pd/GO/Cu composite electrode was prepared by a combination of impregnation method and constant current electrodeposition method, which showed good electrochemical degradation efficiency for the 2,4-dichlorophenol. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to characterize the surface structure, functional group composition, crystal structure and surface element valence of the electrode. Moreover, the stability of the electrode was investigated, and the preparation conditions of the electrode were optimized.

scholarly journals REMOVAL OF A CHEMICAL DYE FROM WASTEWATER USING LOW COST AGRO-BASED ADSORBENTS: CONTINUOUS ADSORBERS

2019 ◽  
Vol 11 (2) ◽  
pp. 229-245
Author(s):  
Hatem Asal Gzar ◽  
Noor Qassim Sabri
Keyword(s):  
Activated Carbon ◽  
Removal Efficiency ◽  
Flow Rate ◽  
Textile Industry ◽  
Ph Value ◽  
Low Cost ◽  
Continuous System ◽  
Initial Concentration ◽  
Chemically Treated ◽  
Maximum Removal

Natural materials that are readily available in large amounts in nature and easily accessible may be used as low cost additives. The aim of this study is to measure the susceptibility of these locally available materials, conocarpus plant, to improve the quality of wastewater discharged from textile industry. In addition to conocarpus- without chemically treated, conocarpus- chemically treated, carbonized conocarpus and activated carbon were used as adsorbents in order to make a comparison, and to test which one of the four types give the best efficiency for removing dye. The ability of adsorbents to adsorb dye was studied using continuous system; studied parameters were effect of flow rate, bed depth, and initial concentration. The experimental results showed that maximum removal efficiency of conocarpus - without chemically treated was found to be 90% after 75 min at flow rate 20 l/h, pH value 3 , bed depth 5cm and initial concentration 40 mg/l. The maximum removal efficiency for conocarpus- chemically treated was up to 83.75% after 15 min at flow rate 10 l/h, pH value 3, bed depth 10 cm and initial dye concentration 40 mg/l. The maximum removal efficiency for carbonized conocarpus was up to 99.67% after 15 min at flow rate 10 l/h, pH value 3, bed depth 10 cm and initial dye concentration 40 mg/l. For activated carbon the maximum removal efficiency was found to be 99.75% after 15 min at flow rate 10 l/h, pH value 3, bed depth 10cm and initial dye concentration 40 mg/l.

Coloration of different textile fibers using glycerol oxides

2016 ◽  
Vol 86 (20) ◽  
pp. 2216-2224 ◽  
Author(s):  
Takeru Ohe ◽  
Takeo Nakai ◽  
Yurika Yoshimura
Keyword(s):  
Textile Industry ◽  
Fenton Reaction ◽  
Reducing Sugars ◽  
Low Cost ◽  
Amino Groups ◽  
Textile Fibers ◽  
Wool Fibers ◽  
Basic Solutions ◽  
Textile Industries ◽  
New Applications

We have investigated new applications of the Maillard reaction in textile industries as an alternative to conventional dyeing methods. Our previous paper indicated that only textile fibers having amino groups, such as wool, silk, and nylon fibers, were colored by chemical reactions with reducing sugars, such as d-glucose and d-xylose, but these coloration reactions were very slow compared with conventional dyeing methods. Recently, we obtained important results from our preliminary studies that trioses, such as glyceraldehyde, imparted deeper coloration to the textile fibers than other reducing sugars. However, these trioses are too expensive to be used as raw colorant materials for the textile industry. In this paper, the coloration reactions of the textile fibers having amino groups with glycerol oxides, which were obtained from low-cost glycerol by the Fenton reaction, were investigated. Interestingly, the obtained fibers were observed to be more deeply colored by the glycerol oxides than the reducing sugars mentioned above, including glyceraldehyde. Furthermore, when the wool fibers were heated in neutral or basic solutions containing glycerol oxides, the color of the fibers quickly became dark brown or almost black.

scholarly journals Adsorption of sulfamethoxazole by wheat straw-derived biochars in seawater

2021 ◽  
Vol 251 ◽  
pp. 02036
Author(s):  
Man Zhao ◽  
Mengying Shao ◽  
Xiaohan Ma
Keyword(s):  
Wheat Straw ◽  
Marine Environment ◽  
Removal Rate ◽  
Low Cost ◽  
Organic Pollutant ◽  
Maximum Adsorption Capacity ◽  
Adsorption Characteristic ◽  
Initial Concentration ◽  
High Pollution ◽  
Maximum Removal

The excessive use of antibiotics in mariculture have resulted in high pollution burdens of antibiotics in marine environment. Biochars, as promising adsorbents, have been widely used in organic pollutant adsorption because of their good adsorption performance and stability. However, adsorption characteristic of antibiotics in seawater by biochar is not well known. Thus, the batch experiment for the adsorption of sulfamethoxazole (SMX) was conducted using wheat straw-derived biochars and graphite (GR) under different initial concentration of SMX and different addition of adsorbent in seawater. The results showed that the wheat straw-derived biochars produced at 700 °C was the optimal adsorbent with the maximum removal rate (R) of 70.3%, the maximum adsorption capacity (Qe) of 1.03 mg g-1 and the maximum adsorption coefficient (Kd) of 0.182 L g-1. The Qe values increased with increasing the initial concentration of SMX, while R and Kd values of SMX decreased. The R values of SMX increased with the increasing dosage of adsorbents, while Qe and Kd values of SMX decreased. These findings will shed new light on the environmentally-friendly and low-cost adsorbent for controlling the antibiotic pollution in marine environment.

scholarly journals FOTOCATÁLISE HETEROGÊNEA APLICADA NO TRATAMENTO DO CORANTE RODAMINA B – USO DE CATALISADOR DE TIO2 SOB RADIAÇÃO UV

e-xacta ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 11
Author(s):  
Jorge David Alguiar Bellido ◽  
Maysa Martins Almeida ◽  
Anna Luisa Silva Cotta ◽  
Júlia Paula Oliveira Júlio ◽  
Carlos Alberto Santos Vaz
Keyword(s):  
Textile Industry ◽  
Chemical Nature ◽  
Glass Plate ◽  
Sample Solution ◽  
Complex Composition ◽  
Photocatalytic Reactor ◽  
Initial Concentration ◽  
Absorbance Measurement ◽  
Rhodamine B Dye ◽  
Uv Lamps

Resumo: Os efluentes dos processos de tingimento na indústria têxtil apresentam uma complexa composição, incluindo principalmente corantes de diferente natureza química, portanto o tratamento destes tem como finalidades necessárias a remoção da cor e a degradação dos compostos orgânicos presentes. Dessa forma, este projeto teve por objetivo apresentar uma alternativa frente ao descarte de efluentes têxteis, usando como modelo o corante rodamina B, um corante resistente à fotodegradação natural. O projeto consistiu na construção de um reator fotocatalítico usando uma placa de vidro jateada e impregnada com catalisador de TiO2. Essa placa foi fixada com inclinação estabelecida. Além disso, foram utilizadas duas lâmpadas germicidas de radiação UV e potência de 15 W. Foram analisados a influência da concentração inicial, tempo de residência no reator e pH da solução para remoção de cor do corante. A descoloração da solução foi acompanhada pela medida da absorbância das amostras coletadas durante o ensaio. A eficiência do reator foi avaliada em relação à descoloração da solução. Os melhores resultados foram obtidos para uma solução de 7,80 mg L-1 a pH 5.0 foi tratada por 430 min alcançando um 97,84% de descoloração. AbstractThe effluents from the dyeing processes in the textile industry have a complex composition, including mainly dyes of different chemical nature, so the treatment of these has the necessary purposes of removing the color and the degradation of the organic compounds present. In this way, this project aimed to present an alternative to the disposal of textile effluents, using as a model the rhodamine B dye, a dye resistant to natural photodegradation. The project consisted in the construction of a photocatalytic reactor using a blasted glass plate and impregnated with TiO2 catalyst, It was fixed in a pre-established inclination, besides that, two germicide UV lamps at 15 W were employed. The influence of the initial concentration, residence time in the reactor and pH of the solution for color removal of the dye were analyzed. Solution discoloration was followed by absorbance measurement of the sample solution collected along the assay. The reactor efficiency was evaluated in relation to the discoloration of the sample solution. Best results were achieved when a solution of 7.80 mg L-1 at pH 5.0 was treated for 430 min reaching 97.84% of discoloration.

Fractionation of polymethylene chains: An electron crystallographic investigation

1986 ◽  
Vol 44 ◽  
pp. 794-795
Author(s):  
Douglas L. Dorset
Keyword(s):  
Cross Section ◽  
Binary Systems ◽  
Linear Chain ◽  
Pure Component ◽  
Organic Substrates ◽  
Crystallographic Investigation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molecular Sizes ◽  
The Stability

A variety of linear chain materials exist as polydisperse systems which are difficultly purified. The stability of continuous binary solid solutions assume that the Gibbs free energy of the solution is lower than that of either crystal component, a condition which includes such factors as relative molecular sizes and shapes and perhaps the symmetry of the pure component crystal structures.Although extensive studies of n-alkane miscibility have been carried out via powder X-ray diffraction of bulk samples we have begun to examine binary systems as single crystals, taking advantage of the well-known enhanced scattering cross section of matter for electrons and also the favorable projection of a paraffin crystal structure posited by epitaxial crystallization of such samples on organic substrates such as benzoic acid.

Site preference and atomic ordering in the ternary Rh5Ga2As: first-principles calculations

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Nilanjan Roy ◽  
Sucharita Giri ◽  
Harshit ◽  
Partha P. Jana
Keyword(s):  
Total Energy ◽  
First Principles ◽  
Density Functional ◽  
Structure Type ◽  
Site Preference ◽  
X Ray Diffraction ◽  
Atomic Ordering ◽  
Functional Theory ◽  
The Stability ◽  
Bonding Characteristics

Abstract The site preference and atomic ordering of the ternary Rh5Ga2As have been investigated using first-principles density functional theory (DFT). An interesting atomic ordering of two neighboring elements Ga and As reported in the structure of Rh5Ga2As by X-ray diffraction data only is confirmed by first-principles total-energy calculations. The previously reported experimental model with Ga/As ordering is indeed the most stable in the structure of Rh5Ga2As. The calculation detected that there is an obvious trend concerning the influence of the heteroatomic Rh–Ga/As contacts on the calculated total energy. Interestingly, the orderly distribution of As and Ga that is found in the binary GaAs (Zinc-blende structure type), retained to ternary Rh5Ga2As. The density of states (DOS) and Crystal Orbital Hamiltonian Population (COHP) are calculated to enlighten the stability and bonding characteristics in the structure of Rh5Ga2As. The bonding analysis also confirms that Rh–Ga/As short contacts are the major driving force towards the overall stability of the compound.

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