scholarly journals PANI Based Metal Oxide Nanocomposite – A Novel Material for Water Purification

2020 ◽  
Vol 4 (2) ◽  
Keyword(s):  
Water Purification ◽  
Organic Dyes ◽  
Polymer Nanocomposite ◽  
Combustion Method ◽  
Chemical Oxidation ◽  
Oxidation Method ◽  
Photo Catalyst ◽  
Absorbance Spectroscopy ◽  
Novel Material ◽  
Synthesized Materials

In the present work NiO/ZnO was synthesized from combustion method, polyaniline and the polyaniline based NiO/ZnO using chemical oxidation method. The synthesized materials were characterized using XRD and UV/Vis absorbance spectroscopy. From XRD, the formation of NiO/ZnO was confirmed. The study investigates the applicability of NiO/ZnO Nanocomposite as photo catalyst for the degradation of organic dyes. Results suggested an increase in degradation efficiency in the case of polymer nanocomposite when compared to counter parts.

scholarly journals Combustion Synthesis of Semiconductor Oxides and Evaluation of Adsorption and Photocatalysis Properties

2020 ◽  
pp. 54-57
Author(s):  
Matheus Gomes Ferreira ◽  
Henrique Cesar Abreu do Nascimento Telles Rodrigues ◽  
Francisco Manoel dos Santos Garrido ◽  
Marta Eloisa Medeiros
Keyword(s):  
Methylene Blue ◽  
Organic Dyes ◽  
Low Cost ◽  
Reaction Medium ◽  
Combustion Method ◽  
Blue Dye ◽  
Magnetic Composite ◽  
Semiconductor Oxides ◽  
Synthesized Materials ◽  
Zno Semiconductor

Improper disposal of effluent contaminated with organic dyes may cause environmental problems. In this context, the ZnO semiconductor and the ZnO/ZnFe2O4 magnetic composite were prepared by the combustion method. The synthesized materials showed adsorption and photocatalysis properties for elimination of methylene blue dye from aqueous medium. About 88% of the methylene blue was eliminated by ZnO and 63% by the composite. In the photocatalysis process, a low cost visible light source was used. These materials can be regenerated by a photo-Fenton process. Moreover, the ZnO/ZnFe2O4 composite can be separated from the reaction medium by a magnetic field.

scholarly journals Functionalized Materials as a Versatile Platform for Enzyme Immobilization in Wastewater Treatment

2021 ◽  
Author(s):  
Agnieszka Kołodziejczak-Radzimska ◽  
Long D. Nghiem ◽  
Teofil Jesionowski
Keyword(s):  
Wastewater Treatment ◽  
Enzyme Immobilization ◽  
Organic Dyes ◽  
Scientific Progress ◽  
Immobilized Enzymes ◽  
Chemical Oxidation ◽  
Biologically Active ◽  
Water Pollutants ◽  
Untreated Wastewater ◽  
Functionalized Materials

Abstract Purpose of Review Untreated wastewater discharge can significantly and negatively impact the state of the environment. Rapid industrialization and economic development have directly contributed to land and water pollution resulting from the application of many chemicals such as organic dyes, pharmaceuticals, and industrial reagents. The removal of these chemicals before effluent discharge is crucial for environmental protection. This review aims to explore the importance of functionalized materials in the preparation of biocatalytic systems and consider their application in eliminating water pollutants. Recent Findings Wastewater treatment methods can be classified into three groups: (i) chemical (e.g., chemical oxidation and ozonation), (ii) physical (e.g., membrane separation and ion exchange), and (iii) biological processes. Biological treatment is the most widely used method due to its cost-effectiveness and eco-friendliness. In particular, the use of immobilized enzymes has recently become more attractive as a result of scientific progress in advanced material synthesis. The selection of an appropriate support plays an important role in the preparation of such biologically active systems. Recent studies have demonstrated the use of various materials for enzyme immobilization in the purification of water. Summary This review identifies and discusses different biocatalytic systems used in the enzymatic degradation of various water pollutants. Materials functionalized by specific groups can serve as good support matrices for enzyme immobilization, providing chemical and thermal stability to support catalytic reactions. Enzymatic biocatalysis converts the pollutants into simpler products, which are usually less toxic than their parents. Due to immobilization, the enzyme can be used over multiple cycles to reduce the cost of wastewater treatment. Future studies in this field should focus on developing new platforms for enzyme immobilization in order to improve degradation efficiency.

Effects of bilirubin configurational photoisomers on the measurement of direct bilirubin by the vanadate oxidation method

2021 ◽  
pp. 000456322199906
Author(s):  
Shohei Kawamoto ◽  
Kosuke Koyano ◽  
Miyo Ozaki ◽  
Takeshi Arai ◽  
Takashi Iwase ◽  
...  
Keyword(s):  
High Performance ◽  
Total Bilirubin ◽  
Critical Factor ◽  
Chemical Oxidation ◽  
Direct Bilirubin ◽  
Serum Samples ◽  
Structural Isomers ◽  
Extreme Caution ◽  
Light Emitting ◽  
Oxidation Method

Background Direct-reacting bilirubin concentrations measured using vanadate chemical oxidation method do not exactly match the conjugated bilirubin concentration. One of the causes is the effect of bilirubin photoisomers. However, the quantitative evaluation of the effects of these photoisomers has not been sufficiently conducted. In particular, the influence of bilirubin configurational isomers on direct bilirubin is the most critical factor. Methods Sixteen residual serum samples were used. For quantitative analysis based on the change in direct bilirubin and bilirubin configurational isomer, samples were irradiated via blue light-emitting diodes to suppress the production of bilirubin structural isomers. Total bilirubin and direct bilirubin concentrations were measured using the vanadate chemical oxidation method. Concentrations of 4Z,15Z-bilirubin IXα and its photoisomers were measured using high-performance liquid chromatography. The sum of 4Z,15E-bilirubin IXα and 4E,15Z-bilirubin IXα was notated as bilirubin configurational isomer, and the differences between the measured values of the irradiated and non-irradiated samples were calculated and notated as ΔDB and ΔBCI. Results In non-irradiated and irradiated samples, total bilirubin and direct bilirubin concentrations were 10.73 mg/dL with significant a decrease to 10.60 mg/dL and 0.69 mg/dL with a significant increase to 0.78 mg/dL, while bilirubin configurational isomer values were 1.00 mg/dL and 1.52 mg/dL, respectively. The linear regression equation revealed a significant positive correlation of Y = 0.187X−0.006 between ΔDB (Y) and ΔBCI (X). Conclusion Applying the vanadate chemical oxidation method affected approximately 19% of the bilirubin configurational isomer concentration for direct bilirubin. Extreme caution is necessary when interpreting the measured values of samples indicative of unconjugated hyperbilirubinaemia.

scholarly journals TEMPERATURE DEPENDENCE OF CONDUCTIVITYOF UREASE DOPED POLYPYRROLE MATERIAL

2021 ◽  
Vol 9 (6) ◽  
pp. 85-90
Author(s):  
Munish Pandey ◽  
Richa Badlani
Keyword(s):  
Infrared Spectroscopy ◽  
Temperature Dependence ◽  
Room Temperature ◽  
Chemical Oxidation ◽  
Oxidation Method ◽  
Temperature Range ◽  
The Matrix

In polymerization of was carried out in the presence of to synthesize – composites by chemical oxidation method. The / have been synthesized with various compositions (10, 15, 20, 25 and 30 ) of in in aquas medium at room temperature. The – composites were characterized by infrared spectroscopy (IR). The d.c. conductivity was studied in the temperature range from 40–100°C. The dimensions of in the matrix have a greater influence on the observed conductivity values.

scholarly journals Measurement methods of total organic carbon in seawater

2021 ◽  
Vol 233 ◽  
pp. 01078
Author(s):  
Shuwei Zhang ◽  
Zhaoyu Wang ◽  
Xuejiao Yan ◽  
Jing Wang ◽  
Li Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
Water Oxidation ◽  
Combustion Method ◽  
Oxidation Method ◽  
Persulfate Oxidation ◽  
Temperature Combustion ◽  
Oxidation Efficiency ◽  
High Temperature Combustion

Total organic carbon (TOC) can reflect the total amount of organic matter in water. This paper introduces the common methods of measuring organic carbon, including high temperature combustion method, potassium persulfate oxidation method, spectrometry, ozone oxidation chemiluminescence method, supercritical water oxidation method and so on. At present, high temperature combustion method is the most widely used method for TOC measurement in seawater, because of its high oxidation efficiency. TOC sensor needs to be developed to realize in-situ and long-term monitoring.

scholarly journals Sepiolite/CNT/S@PANI composite with stable network structure for high performance lithium sulfur batteries

RSC Advances ◽  
2018 ◽  
Vol 8 (32) ◽  
pp. 17950-17957 ◽  
Author(s):  
Guolong Yuan ◽  
Junan Pan ◽  
Yaguang Zhang ◽  
Junxi Yu ◽  
Yanjia He ◽  
...  
Keyword(s):  
Network Structure ◽  
High Performance ◽  
Conductive Polymer ◽  
Chemical Oxidation ◽  
Vacuum Heat Treatment ◽  
Oxidation Method ◽  
Pani Composite ◽  
Lithium Sulfur Batteries ◽  
Stable Network ◽  
Lithium Sulfur

The cathode composite materials for lithium sulfur batteries with a stable network structure consisting of natural sepiolite powders, carbon nanotubes and conductive polymer were synthesized by vacuum heat treatment and chemical oxidation method.

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