Photocatalytic Degradation of Synthetic Sulfur Pollutants in Petroleum Fractions under Different pH and Photocatalyst

2021 ◽  
Vol 02 (01) ◽  
Author(s):  
Mohamad Alif Hakimi Hamdan ◽  
◽  
Nur Hanis Hayati Hairom ◽  
Nurhafisza Zaiton ◽  
Zawati Harun ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Zno Nanoparticles ◽  
Low Cost ◽  
Industrial Effluents ◽  
Degradation Process ◽  
Vital Role ◽  
Petroleum Fraction ◽  
Precipitation Method ◽  
Synthesis Process ◽  
Petroleum Fractions

Thiophene is one of the sulfur compounds in the petroleum fraction that can be harmful to living things and lead to a critical effect on the ecosystem. Photocatalytic degradation is one of the promising methods in treating wastewater as it can mineralization of pollutants into carbon dioxide and water. Other than that, this method is non-toxic and relatively low cost. The production of hydroxyl radicals playing a vital role in the degradation of organic pollutants. It has been claimed that the usage of zinc oxide (ZnO) nanoparticles could give an excellent degradation process as this photocatalyst have high photosensitivity, low cost and chemically stable. However, the preparation method of ZnO nanoparticles will affect the agglomeration, particle size, shape and morphology of particles and lead to influence the photocatalytic activity in degrading thiophene. Therefore, this study focused on the effectiveness of ZnO nanoparticles in the presence of fibrous nanosilica (KCC-1) and polyethylene glycol (PEG) as the capping agent to degrade synthetic thiophene. ZnO/KCC-1 had been synthesized via the precipitation method and characterized by using Fourier Transform Infrared (FTIR). The chemical bond and nature of the photocatalyst from the FTIR results proved that the synthesis process to produce the ZnO/KCC-1 was succeed. The large surface area of KCC-1 increases the effectiveness of ZnO which is supported by the experimental data. Accordingly, the optimum condition for photocatalytic degradation of thiophene is under pH 7 by using ZnO/KCC-1 as photocatalyst. Hence, it is believed that this research could be implemented to remove the thiophene in petroleum fraction from the actual industrial effluents and this can preserve nature in the future.

scholarly journals ZNO Nanoparticles as a Model for Removal of Pharmaceutical Compounds (Vitamin B12)in the Presence of UVA Light

2019 ◽  
Vol 8 (2S3) ◽  
pp. 1406-1409 ◽  
Keyword(s):  
Aqueous Solution ◽  
Vitamin B12 ◽  
Photocatalytic Degradation ◽  
Zno Nanoparticles ◽  
Drug Concentration ◽  
Degradation Process ◽  
Pharmaceutical Compounds ◽  
Real Sample ◽  
Uva Light ◽  
Nanoparticles Suspension

The photocatalytic degradation of an aqueous solution of Vitamin B12 drug has studied under different conditions in the presence of ZnO nanoparticles suspension. The effect of various parameters such as mass of ZnO, Vitamin B12 drug concentration and study Removal of a real sample (mixture of pharmaceuticals compounds) by using ZnO. Results showed that, the photo catalytic degradation process was high at the beginningT andT thenT decreasedT withT time.T TheT explainedT theT photoT catalyticT degradationT efficiency,T whichT wasT increasedT byT increasingT catalystT loadingT fromT 0.05T toT 0.2T g.T TheT degradationT efficiencyT decreasedT withT theT increaseT inT catalystT loading.T ResultsT alsoT showedT thatT theT rateT ofT photoT catalyticT degradationT wasT increasedT withT decreasingT VitaminT B12T drugT concentration.

High Performance Humidity Sensor Based on ZnO Nanoparticles Synthesized by Co-Precipitation Method

2016 ◽  
Vol 848 ◽  
pp. 99-102 ◽  
Author(s):  
Theerapong Santhaveesuk ◽  
Kwunta Siwawongkasem ◽  
Siriwimon Pommek ◽  
Supab Choopun
Keyword(s):  
Sodium Hydroxide ◽  
Zno Nanoparticles ◽  
High Performance ◽  
Humidity Sensor ◽  
Raw Materials ◽  
Low Cost ◽  
Zinc Nitrate ◽  
Precipitation Method ◽  
Zno Particles ◽  
Co Precipitation

ZnO nanoparticles were successfully synthesized by a low cost co-precipitation method using zinc nitrate and sodium hydroxide as the raw materials. It was observed that the synthesized temperatures greatly effect on the size of ZnO nanoparticles. The lower synthesized temperatures resulted in the smaller nanoparticles. By adjusting the mole ratio of sodium hydroxide, the size of ZnO nanoparticles was also changed. The smallest ZnO particles was 47 nm obtained with 0.7 mole of sodium hydroxide. The smallest ZnO nanoparticles from each synthesized temperatures were fabricated as humidity sensor, showing an impressive performance under different relative humidity (17-94% RH). It should be noticed that the ZnO nanoparticles humidity sensor synthesized at 75 °C exhibited high response for 2 times higher than that of synthesized at 95 °C. This is attributed to the higher surface area of ZnO nanoparticles for absorbed water molecule.

scholarly journals Aqueous synthesis of Nb-modified SnO2 quantum dots for efficient photocatalytic degradation of polyethylene for in situ agricultural waste treatment

2021 ◽  
Vol 10 (1) ◽  
pp. 499-506
Author(s):  
Jia Shao ◽  
Kai Deng ◽  
Le Chen ◽  
Chaomeng Guo ◽  
Congshan Zhao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Waste Treatment ◽  
Low Cost ◽  
Agricultural Waste ◽  
Degradation Process ◽  
Active Species ◽  
Aqueous Synthesis

Abstract Low density polyethylene is widely used in agricultural production. It is of low cost and able to significantly improve the quality of fruits. However, its decomposition under natural circumstances needs more than one hundred of years. If not removed in time, it is hazardous to the ecological environment and crops. Up to now, the removal techniques of polyethylene films are polluted, expensive, and difficult to employ. A novel method is proposed for in situ removal of polyethylene by an effective and environmental friendly technique with low cost. The Nb-modified SnO2 quantum dots are prepared for the efficient photocatalytic degradation of polyethylene under visible light. The green synthesis of the photocatalyst includes the procedures of hydrolysis, oxidation, and hydrothermal treatment in aqueous solution. The Nb-modified SnO2 has a band gap of 2.95 eV, which enhances its absorption of visible light. A degradation efficiency of 29% is obtained within 6 h under visible irradiation. The hydroxyl radicals (•OH) are main active species in the degradation process. The prepared Nb-SnO2 quantum dots demonstrate a promising application in the photocatalytic degradation of polyethylene, contributing a novel strategy for the in situ treatment of agricultural wastes.

scholarly journals Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

2016 ◽  
Vol 34 (4) ◽  
pp. 819-827 ◽  
Author(s):  
Vaibhav Koutu ◽  
Lokesh Shastri ◽  
M. M. Malik
Keyword(s):  
Raman Spectroscopy ◽  
Zinc Oxide ◽  
Optical Properties ◽  
Zno Nanoparticles ◽  
Visible Spectrum ◽  
Hexagonal Wurtzite Structure ◽  
Peak Shift ◽  
Precipitation Method ◽  
Synthesis Process ◽  
Co Precipitation

AbstractIn the present work, powder zinc oxide samples were prepared by varying NaOH concentration (0.1 M – 0.4 M) using wet-chemical co-precipitation method. As-synthesized ZnO was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), photoluminescence (PL) and Raman spectroscopy. Formation of hexagonal wurtzite structure of the ZnO samples has been revealed from XRD studies. This study further suggests reduction in crystallite size from 40 nm to 23 nm with an increase in NaOH concentration which is confirmed by FESEM. PL and Raman spectroscopy studies of these samples show significant peak shift towards the higher and lower energy respectively, with maximum PL emission between 400 nm and 470 nm region of the visible spectrum. Noticeable inverse relationship between optical properties of ZnO nanoparticles and NaOH concentration may be attributed to the rapid nucleation during the synthesis process. With these remarkable properties, ZnO nanoparticles may find applications in nanoelectronic devices, sensors, nanomedicine, GATE dielectrics, photovoltaic devices, etc.

Visible light assisted photocatalytic degradation of acid red 88 using Au–ZnO nanophotocatalysts

2009 ◽  
Vol 60 (6) ◽  
pp. 1589-1596 ◽  
Author(s):  
Panneer Selvam Sathish Kumar ◽  
Michael Ruby Raj ◽  
Sambandam Anandan ◽  
Meifang Zhou ◽  
Muthupandian Ashokkumar
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Zno Nanoparticles ◽  
Analytical Techniques ◽  
Electron Acceptors ◽  
Precipitation Method ◽  
Light Illumination ◽  
Photogenerated Electrons ◽  
Visible Light Illumination ◽  
Oxide Particles

Photocatalytic degradation of acid red 88 (AR88) in aqueous suspensions of Au–ZnO nanoparticles under visible light illumination was studied in order to evaluate various effects of the Au deposition on the ZnO photocatalytic activity. Au–ZnO nanoparticles were prepared by deposition precipitation method and characterized by different analytical techniques. In Au–ZnO system, all gold nanoparticles were tethered on the surface of zinc oxide particles. This enhanced the AR88 adsorption on the Au–ZnO surface and acted as electron traps which is the main reason for significant enhancement in the AR88 photodegradation under visible light illumination compared to ZnO alone. Further in the presence of electron acceptors complete decolorization of the dye was observed, which might be due to immediate trapping of the photogenerated electrons by electron acceptors.

Structural, Optical and Photocatalytic Properties of ZnO Nanoparticles Prepared by Precipitation Method

2014 ◽  
Vol 979 ◽  
pp. 163-166 ◽  
Author(s):  
Sumetha Suwanboon ◽  
Pongsaton Amornpitoksuk
Keyword(s):  
Crystal Structure ◽  
Optical Property ◽  
Photocatalytic Degradation ◽  
Zno Nanoparticles ◽  
Uv Light ◽  
Photocatalytic Properties ◽  
Precipitation Method ◽  
Structure Morphology ◽  
Naoh Solution

ZnO nanoparticles were synthesized from PEG600 diacid modified-Zn (CH3COO)2.2H2O solution by precipitation method and an aqueous NaOH solution was used as precipitating agent. The crystal structure, morphology and optical property of ZnO nanoparticles were characterized by XRD, SEM and UV-Vis spectrophotometer, respectively. The crystallinity increased while the Eg value decreased as a function of PEG600 diacid concentrations. The ZnO nanoparticles that had the highest crystallinity and lowest Eg value exhibited the highest efficiency of photocatalytic degradation of about 90% when irradiating with a UV light for 3 h.

scholarly journals Decolorization of Azodyes by Chemically and Biosynthesized ZnO Nanoparticles

2021 ◽  
Author(s):  
Jasmine Swain ◽  
Padmashree Kulkarni ◽  
Suba Manuel
Keyword(s):  
Zno Nanoparticles ◽  
Waste Water Treatment ◽  
Industrial Effluents ◽  
Dye Decolorization ◽  
Precipitation Method ◽  
Biological Synthesis ◽  
Zno Nps ◽  
Vis Spectroscopy ◽  
Co Precipitation ◽  
Biological Methods

Abstract Dye contaminants in industrial effluents contribute significantly to environmental pollution. Conventional waste water treatment methods are expensive and energy consuming. These limitations could be overcome by the use of nanobioremediation processes. The present work was an effort to study decolorization of azodyes by ZnO nanoparticles (NPs). Rubine GDB (R-GDB) and Congo Red (CR) were the azodyes selected for the study. The ZnO NPs were successfully synthesized by chemical and biological methods. Chemical synthesis of ZnO NPs was carried out by co-precipitation method; biological synthesis was done using bacteria Bacillus subtilis. The synthesized nanoparticles were characterized by UV-Vis Spectroscopy, SEM and XRD. The UV spectrophotometer showed peaks in the range of 300-400 nm. SEM pictures indicated the presence of NPs in the size of 100nm-200nm. XRD results were analyzed on the basis of the peaks that were seen. EDX analysis showed the presence of Zn particles and oxygen particles majorly. Decolorization efficiency was evualated by calculating % decolorization by Meyer’s method. Chemically synthesized NPs showed maximum % decolorization of the R-GDB (89.058 %) and CR (88.888%). The biosynthesized NPs showed the least decolorization (R- GDB -18 % and CR 20.357 %). However, moderate percentages of decolorization of both the azodyes were observed when a combination of the NPs was used (R-GDB -36.072 % and CR- 39.824 %). Nanoparticles showed good potential for the decolorization of the azo dyes. With further optimization of the parameters the present findings show that dye decolorization by chemically synthesized ZnO NPs could be used as a probable nanobioremediation approach to treat wastewaters.

Comparative Study on Photocatalytic Performance of (La,Fe) and (Ce,Fe)-Codoped ZnO Nanoparticles

2015 ◽  
Vol 827 ◽  
pp. 31-36 ◽  
Author(s):  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Photocatalytic Degradation ◽  
Zno Nanoparticles ◽  
Congo Red ◽  
Diffuse Reflectance Spectroscopy ◽  
Uv Light ◽  
Organic Pollutant ◽  
Ammonium Oxalate ◽  
Butyl Alcohol ◽  
Precipitation Method ◽  
X Ray

The present study evaluates the photocatalytic degradation of congo red as a model of organic pollutant over LaFe- and CeFe-codoped ZnO nanoparticles under UV light irradiation. Both photocatalysts were synthesized using co-precipitation method and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, diffuse reflectance spectroscopy. The photodegradation efficiency of congo red using two 20W UV lamp was higher for LaFe-codoped ZnO nanoparticles compared with CeFe-codoped ZnO nanoparticles. Photocatalytic mechanism was investigated by measuring the photocatalytic degradation rate in the presence of ammonium oxalate, natrium sulfate, tert-butyl alcohol as photogenerated holes, photogenerated electrons and hydroxyl radical species scavenger. The results revealed that electrons are the main species in the photocatalytic process.

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