Immobilization of ZnO Suspension on Glass Substrate to Remove Filtration During the Removal of Remazol Red R from Aqueous Solution

2016 ◽  
Vol 12 (6) ◽  
pp. 4127-4133
Author(s):  
Nazmul Kayes ◽  
Jalil Miah ◽  
Md. Obaidullah ◽  
Akter Hossain ◽  
Mufazzal Hossain
Keyword(s):  
Aqueous Solution ◽  
Glass Substrate ◽  
Uv Light ◽  
Aqueous Suspension ◽  
Light Irradiation ◽  
Zno Films ◽  
Light Sources ◽  
Zno Film ◽  
Semiconductor Oxides ◽  
Remazol Red

Photodegradation of textile dyes in the presence of an aqueous suspension of semiconductor oxides has been of growing interest. Although this method of destruction of dyes is efficient, the main obstacle of applying this technique in the industry is the time and cost involving separation of oxides from an aqueous suspension. In this research, an attempted was made to develop ZnO films on a glass substrate by simple immobilization method for the adsorption and photodegradation of a typical dye, Remazol Red R (RRR) from aqueous solution. Adsorption and photodegradation of  RRR were performed in the presence of glass supported ZnO film. Photodegradation of the dye was carried out by varying different parameters such as the catalyst dosage, initial concentrations of RRR, and light sources. The percentage of adsorption as well as photodegradation increased with the amount of ZnO, reaches a maximum and then decreased. Maximum degradation has been found under solar light irradiation as compared to UV-light irradiation. Removal efficiency was also found to be influenced by the pre-sonication of ZnO suspension.

Effects of UV light irradiation on the growth of ZnO films

1989 ◽  
Vol 94 (4) ◽  
pp. 895-900 ◽  
Author(s):  
Masaru Shimizu ◽  
Akira Monma ◽  
Tadashi Shiosaki ◽  
Akira Kawabata ◽  
Yuji Yamamoto
Keyword(s):  
Uv Light ◽  
Light Irradiation ◽  
Zno Films ◽  
Uv Light Irradiation

Zinc Oxide Thin Films Grown on Nanostructured Al Thin Layer/Glass Substrate by RF Magnetron Sputtering

2011 ◽  
Vol 239-242 ◽  
pp. 777-780
Author(s):  
Ting Zhi Liu ◽  
Shu Wang Duo ◽  
C Y Hu ◽  
C B Li
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Magnetron Sputtering ◽  
Thin Layer ◽  
Glass Substrate ◽  
Rf Magnetron Sputtering ◽  
Zno Films ◽  
Zno Film ◽  
Substrate Roughness ◽  
Axis Orientation

ZnO films were deposited on nanostructured Al (n-Al) /glass substrate by RF magnetron sputtering. The results shows that the relation (I (002) /I (100) ≈ I annealed (002)/I annealed (100) ≈1.1) shows the rough n-Al surface is suitable for the growth of a-axis orientation. Meanwhile, the influences of substrate roughness, crystallinity and (101) plane of ZnO film deposited on n-Al layer have been discussed. XPS implies more oxygen atoms are bound to Aluminum atoms, which result in the increase of high metallic Zn in the film.

Thickness Effect of Zno Film on the Performance of Photocatalytic in a p-Nio/n-Zno Heterostructure under Solar Light Irradiation

2020 ◽  
Vol 62 ◽  
pp. 87-95
Author(s):  
Hichem Farh ◽  
Abdelouahab Noua ◽  
Rebai Guemini ◽  
Djamal Eldine Guitoume ◽  
Oussama Zaoui
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Degradation Rate ◽  
Visible Region ◽  
Light Irradiation ◽  
Thickness Effect ◽  
Solar Light ◽  
Zno Films ◽  
Zno Film ◽  
Solar Light Irradiation

In this work, we studied the ZnO film thickness effect on the photocatalytic performance of n-ZnO/p-NiO heterostructures. The ZnO and NiO films were prepared by sol-gel dip-coating technique and the thickness of the ZnO film was varied by changing the number of coatingsfrom 2 to12. The formation of the p-NiO/n-ZnO heterostructure was confirmed by X ray diffraction (XRD). The obtained ZnO films present a wurtzite structure with a preferred orientation along (002) direction while the NiO film present a cubic structure highly oriented along (200) direction. UV-visible transmittance spectra of the prepared heterostructures revealed a good transparency in the visible region. The photocatalytic propertiesof the n-ZnO/p-NiO heterostructures were investigated by measuring the degradation rate of methylene blue. All the samples exhibit a good photocatalytic activity under solar light irradiation. The photocatalytic activity of p-NiO/n-ZnO heterostructureswas strongly correlated with the number of ZnO coatings. The highest photocatalytic activity was obtained at 6 coatings with a degradation rate of methylene blue equal to 98.67% for 4.5h of irradiation.

Photocatalytic Oxidation of Methyl Orange Dye over Titania Nanocatalyst

2012 ◽  
pp. 33-40
Author(s):  
Norzita Ngadi ◽  
Aisyah Nosri
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Light Source ◽  
Photocatalytic Oxidation ◽  
Uv Light ◽  
Light Condition ◽  
Light Irradiation ◽  
Uv Light Irradiation ◽  
Methyl Orange Dye ◽  
Dark Room

In this study, the ability of titania dioxide nanoparticles (TiO ) to remove methyl orange dye in aqueous solution was investigated. The effects of TiO dosage (i.e. 0.4, 0.8, 1.2, 1.6 and 2 g), pH (i.e. 4, 6, 7, 8, 10 and 12) temperature (30, 40 and 50°C) and light source (i.e. UV, sunlight and dark room) on the removal of methyl orange dye were studied. The experiments were conducted under the UV light irradiation with the presence of air bubbling. The samples were analyzed using UV-vis spectrophotometer at wavelength of 467 nm. From this study, it was found that the TiO dose, pH, temperature and the presence of light had a strong effect on the removal of dye. The removal of dye was optimum at TiO loading of 2.0 g, pH of 4, temperatureof 30°C and under UV light condition. Dalam kajian ini, kebolehupayaan titanium dioksida (TiO ) untuk menyingkirkan pewarna metil oren daripada larutan telah dikaji. Kesan-kesan dos TiO (iaitu 0.4, 0.8, 1.2, 1.6 and 2 g ), pH (iaitu 4,6,8,10 dan 12) suhu (iaitu 30, 40 and 50°C) dan sumber cahaya (UV, cahaya matahari dan bilik yang gelap) terhadap penyingkiran pewarna metil oren telah dikaji. Eksperimen telah dijalankan di bawah radiasi UV dengan kehadiran oksigen terlarut. Sampel telah dianalisa menggunakan UV-vis spektrofotometer dengan panjang gelombang 467 nm. Daripada kajian ini, telah didapati bahawa dos TiO , pH, suhu dan kehadiran cahaya memberikan kesan yang ketara terhadap penyingkiran pewarna. Penyingkiran pewarna adalah paling optimum pada dos TiO, 2 g, pH, 4, suhu, 30°C dan dibawah cahaya UV.

The Photoelectric and Photocatalytic Property Study of Cu2S/ZnO Films

2012 ◽  
Vol 271-272 ◽  
pp. 301-304
Author(s):  
Feng Xu ◽  
Sheng Nan Sun ◽  
Yi Xin Wang ◽  
Jia Jia Cao ◽  
Zi Han Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Magnetron Sputtering ◽  
Glass Substrate ◽  
Photocatalytic Property ◽  
Rf Magnetron Sputtering ◽  
Zno Films ◽  
Zno Film

ZnO film and Cu2S/ZnO bilays on the glass substrate were fabricated by RF magnetron sputtering. We carried out the experiments by adjusting the thickness of Cu2S on ZnO layer. The performance of Cu2S/ZnO on the transparency, conduction and photocatalysis were investigated. The photocatalytic experiments showed a good photocatalytic activity for photodegradation of methyl orange.

Microwave-assisted synthesis of c-axis oriented ZnO nanorods on a glass substrate coated with ZnO film

2007 ◽  
Vol 1035 ◽  
Author(s):  
Ken-ichi Ogata ◽  
Kazuto Koike ◽  
Shigehiko Sasa ◽  
Masataka Inoue ◽  
Mitsuaki Yano
Keyword(s):  
Glass Substrate ◽  
Zno Nanorods ◽  
Zno Films ◽  
Microwave Assisted Synthesis ◽  
Zno Film ◽  
Microwave Assisted ◽  
Selective Area ◽  
Excitonic Emission ◽  
Visible Defect

AbstractZnO nanorods synthesis on a glass substrate coated with ZnO film was performed by means of microwave-assisted heating. Nanorod structure was dependent on the underlying ZnO films; slightly tilted nanorods about 800nm diameter were synthesized on an as-sputtered ZnO film while highly c-axis oriented ones about 100nm diameter were developed on the ZnO film after annealing. Photoluminescence spectra of the ZnO nanorods at 6K showed a badedge excitonic emission with comparable intensity to a visible defect related emission, suggesting the existence of many radiative defects which would be originated from insufficient quality of the underlying ZnO layer. Pattered photoresist layer can successfully be utilized for synthesis of the ZnO nanolods in selective area.

Reversible Surface Wettability Conversion of ZnO Film

2010 ◽  
Vol 434-435 ◽  
pp. 420-422
Author(s):  
Hong Qin Liu ◽  
Shi Xiang Lu ◽  
Wen Guo Xu ◽  
Wei Pan
Keyword(s):  
Aqueous Solution ◽  
Uv Irradiation ◽  
Chemical Oxidation ◽  
Surface Wettability ◽  
Dimethyl Formamide ◽  
Zno Films ◽  
Zno Film

The ZnO films were fabricated by chemical oxidation of metallic Zn in a 5% N, N-dimethyl- formamide (DMF) aqueous solution at 95°C for 24h. After modified with octadecyltrichlorosilane (OTS), a superhydrophobic ZnO film was obtained. The superhydrophobic film turned into a superhydrophilic one after UV irradiation, which can be recovered through being placed in the dark.

Structural analysis of acetylated hardwood lignins and their photoyellowing properties

2005 ◽  
Vol 83 (12) ◽  
pp. 2132-2139 ◽  
Author(s):  
Yunqiao Pu ◽  
Arthur J Ragauskas
Keyword(s):  
Uv Light ◽  
Light Irradiation ◽  
Side Chain ◽  
Hydroxyl Groups ◽  
Light Sources ◽  
Fluorescent Lamp ◽  
Mild Acid Hydrolysis ◽  
Relative Ease ◽  
Uv Light Irradiation ◽  
Mild Acid

Lignin was isolated from aspen bleached chemithermomechanical pulp by employing a mild acid hydrolysis procedure, and the extracted material was acetylated with acetic anhydride. Nuclear magnetic resonance analyses indicated that the relative ease of acetylating lignin hydroxyl groups was phenolic >> γ-side chain > α-side chain. Non-acetylated and acetylated lignins were impregnated onto cellulosic test sheets, and the photo-behavior of the lignins was examined under irradiation with two light sources, a fluorescent lamp and a black lamp. Optical reflective studies indicated acetylation efficiently inhibited the photodiscoloration of aspen bleached chemithermomechanical pulp lignin under visible and near-UV light irradiation. The photostability of the lignin was correlated to the extent of lignin acetylation. The observed photo-stabilization of acetylated lignin during light irradiation was attributed to the acetylation of phenoxy and aliphatic hydroxyl groups in lignin.Key words: green chemistry, hardwood lignin, acetylation, photo-stabilization, photoyellowing, NMR.

Transparent and Compact Zinc Oxide Thin Films via Two-Step Electrodeposition from Aqueous Solution

2007 ◽  
Vol 336-338 ◽  
pp. 2221-2223
Author(s):  
Fang Peng ◽  
Xiao Min Li ◽  
Xiang Dong Gao
Keyword(s):  
Aqueous Solution ◽  
Zinc Oxide ◽  
Optical Band Gap ◽  
Zinc Nitrate ◽  
Zno Films ◽  
Zno Film ◽  
Electrodeposition Process ◽  
Zinc Oxide Films ◽  
Ito Glass ◽  
Galvanostatic Deposition

Zinc oxide films have been deposited on ITO/glass substrate by a two-step electrodeposition method from zinc nitrate aqueous solution. The two-step electrodeposition process included a potentiostatic pre-deposition and a galvanostatic deposition. Obtained ZnO film possesses high c-axis preferential orientation, smooth and compact morphology, high transmittance in the visible band, and optical band gap of 3.43eV. Compared with the film prepared by direct galvanostatic deposition, the crystalline quality and optical properties of ZnO films were significantly improved.

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