On the photocatalytic properties of nano-TiO2 with dual-phase structure for aqueous methyl-red dye degradation

Metil merah merupakan salah satu zat warna golongan azo yang sering digunakan dalam industri dan laboratorium. Penggunaan metil merah dapat menimbulkan efek terhadap kesehatan dan lingkungan. Oleh sebab itu dilakukan metode fotodegradasi dengan menggunakan semikonduktor dan radiasi sinar tampak. Semikonduktor yang digunakan yaitu berbahan dasar tembaga sulfat hidrat dan perak nitrat. Prekusor tembaga sulfat hidrat dibuat dari pengolahan limbah logam tembaga hasil pemotongan tembaga yang ada di bengkel Lembaga Ilmu Pengetahuan Indonesia (LIPI) Bandung. Bahan semikonduktor juga memiliki kemampuan dalam menghambat pertumbuhan bakteri. Hasil optimum yang didapatkan dalam proses fotodegradasi dan antibakteri merupakan gabungan antara kedua prekusor tembaga sulfat hidrat dan perak nitrat dengan bantuan penyinaran. Kemampuan dalam menghambat pertumbuhan bakteri didapatkan persentase kematian 100 % untuk masing-masing bakteri, yaitu Escherichia coli dan Staphylococcus aureus. Aktifitas fotokatalitiknya dengan konsentrasi semikonduktor 10 ppm untuk mendegradasi zat warna metil merah 5 ppm, selama 23 jam, dimana persentase degradasi yang didapatkan dengan penyinaran lebih tinggi dibandingkan dengan tanpa penyinaran. Pengaruh pH larutan terhadap degradasi metil merah yaitu optimum pada pH 12 (basa). Methyl red is one of the azo group dyes that is often used in industry and laboratories. The use of methyl red can have an effect on health and the environment. Therefore photodegradation method is done by using semiconductor and visible light radiation. The semiconductor used is based on copper sulfate hydrate and silver nitrate. The copper sulphate hydrate precursor is made from the processing of copper-cut copper metal waste in the workshop of the Indonesian Institute of Sciences (LIPI) in Bandung. Semiconductor materials also have the ability to inhibit bacterial growth. The optimum results obtained in the photodegradation and antibacterial process are a combination of both copper sulfate hydrate precursor and silver nitrate with the help of irradiation. The ability to inhibit bacterial growth obtained 100% mortality for each bacterium, namely Escherichia coli and Staphylococcus aureus. Photocatalytic activity with 10 ppm semiconductor concentration to degrade methyl red dye 5 ppm, for 23 hours, where the percentage of degradation obtained by irradiation is higher than without irradiation. The effect of pH of the solution on the degradation of methyl red is optimum at pH 12 (base).

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Dual‐phase structure design of Mn‐site nickel doping Li 2 MnSiO 4 @C cathode material for improved electrochemical lithium storage performance

International Journal of Energy Research ◽

10.1002/er.6749 ◽

2021 ◽

Author(s):

Yang Zhan ◽

Qing Wang ◽

Shao‐Hua Luo ◽

Si Li ◽

Luo‐Xuan Wang ◽

...

Keyword(s):

Cathode Material ◽

Phase Structure ◽

Structure Design ◽

Dual Phase ◽

Lithium Storage ◽

Nickel Doping ◽

Storage Performance

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Snoek and Snoek-Köster-like Relaxations in Low Carbon Steel with Ferrite-Martensite Dual Phase Structure

Transactions of the Japan Institute of Metals ◽

10.2320/matertrans1960.23.243 ◽

1982 ◽

Vol 23 (5) ◽

pp. 243-249 ◽

Cited By ~ 1

Author(s):

Yoshimitsu Iwasaki ◽

Koichi Hashiguchi

Keyword(s):

Carbon Steel ◽

Phase Structure ◽

Low Carbon Steel ◽

Dual Phase ◽

Low Carbon

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Structure, morphology features and photocatalytic properties of α-Ag2WO4 nanocrystals-modified Palygorskite clay

Journal of Photocatalysis ◽

10.2174/2665976x02666210210163001 ◽

2021 ◽

Vol 02 ◽

Author(s):

Amanda Carolina Soares Jucá ◽

Francisco Henrique Pereira Lopes ◽

Herbert Vieira Silva-Júnior ◽

Lara Kelly Ribeiro Silva ◽

Elson Longo ◽

...

Keyword(s):

Photocatalytic Activity ◽

Rhodamine B ◽

Dye Degradation ◽

Degradation Kinetics ◽

Low Cost ◽

Catalytic Efficiency ◽

Photocatalytic Properties ◽

Impregnation Method ◽

Heat Treated ◽

Modified Palygorskite

Aims: In the present study, we investigate the photocatalytic properties of α-Ag2WO4 nanocrystals-modified Palygorskite (PAL) clay synthesized by the impregnation method. The PAL clay was chemically purified and heat-treated (500 ºC for 2 h), which served as an excellent supporting matrix for loading α-Ag2WO4(α-AWO) nanocrystals. Background: Water contamination is one of the most serious problems affecting human health, ecosystem survival, and the economic growth of societies. Industrial effluents, such as textile dyes, when not treated and improperly discharged into water resources are considered the main cause of water pollution. Thus the scientific community has been developing effective remediation technologies based on advanced oxidative processes to reduce the harmful effects of these organic pollutants. Objective: Improve the photocatalytic activity of PAL clay with α-AWO nanocrystals to degradation of Rhodamine B (RhB) dye. Methods: We purify and heat-treated the PAL clay, synthesize nanocrystals ofα-AWO nanocrystals and modify PAL clay with 30% α-AWO nanocrystals by the impregnation method. The modified PAL clay was able to improve RhB dye degradation. The materials were characterized by XRD, RAMAN,FE-SEM, FT-IR, XRF, etc. The samples were used as photocatalysts under UV-C lamps for the degradation of RhB dye in order to analyze its catalytic performances. Results: ThePAL clay modified with 30% α-AWO nanocrystals showed a catalytic efficiency of 79%, and degradation kinetics about 16 times higher when compared to PAL-500 only purified and heat-treated at 500 ºC. In this way, this PAL-modified is an alternative as a low-cost photocatalyst for the degradation of RhB dye. Conclusion: Ultraviolet-Visiblespectra revealed that our materials have opticalband gap energies controlled by indirect and direct electronic transitions and suitable to be activated under ultraviolet illumination. The adequate amount (30 wt.%) of α-Ag2WO4 nanocrystals added to PAL brought significant improvement of photocatalytic activity for the degradation of rhodamine B. Finally, a photocatalytic mechanism was proposed in detail.

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Biodegradation of Synthetic Dye by Endophytic Fungal Isolate in Calotropis procera Root

International Journal of Applied Sciences and Biotechnology ◽

10.3126/ijasbt.v3i3.13136 ◽

2015 ◽

Vol 3 (3) ◽

pp. 373-380 ◽

Cited By ~ 4

Author(s):

Shiv Kumar Verma ◽

Anand Kumar ◽

Moti Lal ◽

Mira Debnath

Keyword(s):

Methylene Blue ◽

Rose Bengal ◽

Dye Degradation ◽

Fungal Endophytes ◽

Brilliant Blue ◽

Calotropis Procera ◽

Methyl Red ◽

Coomassie Brilliant Blue ◽

Fungal Isolates ◽

Coomassie Brilliant

In this study, based on colony morphology characteristics, a total of 19 fungal endophytes were isolated from root of Calotropis Procera a traditional Indian medicinal plant. All fungal isolates were screened for their dye degradation ability. The dyes used as test dyes were Rose Bengal (RB), azo dye Methyl Red (MR), Coomassie Brilliant Blue (CBB) and Methylene Blue (MB) and the concentration of each dye in the experiment was kept 100mg/L. Among the 19 fungal endophytic isolates (CPR1-CPR19), only one isolate CPR4 showed strong dye decolourization capability against all the four test dye. Dye decolourization ability by the isolate CPR4 was determined to be 97.4%, 87%, 65% and 45% for Rose Bengal (RB), Methyl Red (MR), Coomassie Brilliant Blue (CBB) and Methylene Blue (MB) respectively. Complete colour decolourization was observed with rose Bengal followed by Methyl Red. Glucose minimal medium was used for liquid and solid culture of fungal isolates. Fungal biomass production in the presence of four test dye was studied and compare with control culture of fungal endophytes. Effect of temperature, pH, stationary and agitation conditions on dye degradation was also studied.Int J Appl Sci Biotechnol, Vol 3(3): 373-380

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Application of fungal copper carbonate nanoparticles as environmental catalysts: organic dye degradation and chromate removal

Microbiology ◽

10.1099/mic.0.001116 ◽

2021 ◽

Vol 167 (12) ◽

Author(s):

Feixue Liu ◽

Dinesh Singh Shah ◽

Laszlo Csetenyi ◽

Geoffrey Michael Gadd

Keyword(s):

Photoelectron Spectroscopy ◽

Catalytic Properties ◽

Dye Degradation ◽

Antibacterial Properties ◽

Toxic Metal ◽

Catalytic Efficiency ◽

Methyl Red ◽

Copper Carbonate ◽

Wide Range ◽

Organic Dye Degradation

Biomineralization is a ubiquitous process in organisms to produce biominerals, and a wide range of metallic nanoscale minerals can be produced as a consequence of the interactions of micro-organisms with metals and minerals. Copper-bearing nanoparticles produced by biomineralization mechanisms have a variety of applications due to their remarkable catalytic efficiency, antibacterial properties and low production cost. In this study, we demonstrate the biotechnological potential of copper carbonate nanoparticles (CuNPs) synthesized using a carbonate-enriched biomass-free ureolytic fungal spent culture supernatant. The efficiency of the CuNPs in pollutant remediation was investigated using a dye (methyl red) and a toxic metal oxyanion, chromate Cr(VI). The biogenic CuNPs exhibited excellent catalytic properties in a Fenton-like reaction to degrade methyl red, and efficiently removed Cr(VI) from solution due to both adsorption and reduction of Cr(VI). X-ray photoelectron spectroscopy (XPS) identified the oxidation of reducing Cu species of the CuNPs during the reaction with Cr(VI). This work shows that urease-positive fungi can play an important role not only in the biorecovery of metals through the production of insoluble nanoscale carbonates, but also provides novel and simple strategies for the preparation of sustainable nanomineral products with catalytic properties applicable to the bioremediation of organic and metallic pollutants, solely and in mixtures.

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