scholarly journals N-TiO2 synthesized by reflux method in H2O2-urea solution: point of zero charge, adsorption propertives, and photocatalytic activities under visible light

2015 ◽  
Vol 18 (1) ◽  
pp. 81-91
Author(s):  
Yen Thi Hai Huynh ◽  
Nhu Thi So Le
Keyword(s):  
Visible Light ◽  
Anatase Phase ◽  
High Surface ◽  
High Surface Area ◽  
Point Of Zero Charge ◽  
Urea Solution ◽  
Nitrogen Doped ◽  
Photocatalytic Activities ◽  
Solution Point ◽  
Low Crystalline

Nitrogen-doped TiO2 has been attractive because it showed photocatalytic activities under visible light. In this study, N-TiO2 was synthesized by refluxing gel TiO2 in the solutions of H2O2-urea. The influences of the concentration of urea and H2O2 solutions on photocatalytic activities of N-TiO2 were investigated. Samples were characterized by XRD, IR, pHPZC, BET, DRS. Adsorption and photocatalytic properties were studied by the degradation of methylene blue (MB) under visible light. The samples showed anatase phase with low crystalline, but high surface area. They had low pHPZC of 1-1.5, and adsorbed well cation dyes such as MB. When the concentration of urea increased from 1 M to 2 M, and 3 M, the adsorption capacity increased, but the photocatalysis decreased. Sample with the highest photocatalytic activity was obtained when refluxing in the solution containing 10 mL H2O2.

scholarly journals A Novel N-Doped Nanoporous Bio-Graphene Synthesized from Pistacia lentiscus Gum and Its Nanocomposite with WO3 Nanoparticles: Visible-Light-Driven Photocatalytic Activity

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6569
Author(s):  
Maryam Afsharpour ◽  
Mehdi Elyasi ◽  
Hamedreza Javadian
Keyword(s):  
Visible Light ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Nanoporous Structure ◽  
Pistacia Lentiscus ◽  
Nitrogen Doped ◽  
Visible Light Driven ◽  
Ft Ir ◽  
Natural Carbon

This paper reports the synthesis of a new nitrogen-doped porous bio-graphene (NPBG) with a specific biomorphic structure, using Pistacia lentiscus as a natural carbon source containing nitrogen that also acts as a bio-template. The obtained NPBG demonstrated the unique feature of doped nitrogen with a 3D nanoporous structure. Next, a WO3/N-doped porous bio-graphene nanocomposite (WO3/NPBG-NC) was synthesized, and the products were characterized using XPS, SEM, TEM, FT-IR, EDX, XRD, and Raman analyses. The presence of nitrogen doped in the structure of the bio-graphene (BG) was confirmed to be pyridinic-N and pyrrolic-N with N1 peaks at 398.3 eV and 400.5 eV, respectively. The photocatalytic degradation of the anionic azo dyes and drugs was investigated, and the results indicated that the obtained NPBG with a high surface area (151.98 m2/g), unique electronic properties, and modified surface improved the adsorption and photocatalytic properties in combination with WO3 nanoparticles (WO3-NPs) as an effective visible-light-driven photocatalyst. The synthesized WO3/NPBG-NC with a surface area of 226.92 m2/g displayed lower bandgap and higher electron transfer compared with blank WO3-NPs, leading to an increase in the photocatalytic performance through the enhancement of the separation of charge and a reduction in the recombination rate. At the optimum conditions of 0.015 g of the nanocomposite, a contact time of 15 min, and 100 mg/L of dyes, the removal percentages were 100%, 99.8%, and 98% for methyl red (MR), Congo red (CR), and methyl orange (MO), respectively. In the case of the drugs, 99% and 87% of tetracycline and acetaminophen, respectively, at a concentration of 10 mg/L, were removed after 20 min.

Synthesis of Nitrogen-Doped Titanium Oxide Nanostructures Via a Surfactant-Free Hydrothermal Route

2005 ◽  
Vol 20 (11) ◽  
pp. 3011-3020 ◽  
Author(s):  
Chang Houn Rhee ◽  
Jae Sung Lee ◽  
Soo Hyun Chung
Keyword(s):  
Anatase Phase ◽  
High Surface ◽  
High Surface Area ◽  
Ammonium Ion ◽  
Molar Ratio ◽  
Titanium Oxides ◽  
Hydrothermal Conditions ◽  
Hydrothermal Route ◽  
Hydrothermal Temperature ◽  
Nitrogen Doped

Nitrogen-doped titanium oxides nanostructures were synthesized by a new method proposed here from titanium oxysulfate precursor in a NH4OH solution under hydrothermal conditions without any extra templates as structure driving agents. The material synthesized with NH4OH was an ammonium titanate and showed curled nanosheets, nanofibers or nanorods morphologies depending on the molar ratio of NH4OH to titanium precursor and the hydrothermal temperature. The nanofibrous titanates had a high surface area over 500 m2 g−1 and a pore volume of 0.72 cm3 g−1. The calcination of as-synthesized material at 673 K produced a titanium oxynitride TiO2−xNx with anatase phase, which absorbed visible light. Ion exchange of ammonium ion of the titanate with sodium Na2Ti3O7−xNx enhanced the thermal stability of the titanate phase.

scholarly journals Low-Temperature Sol-Gel Synthesis of Nitrogen-Doped Anatase/Brookite Biphasic Nanoparticles with High Surface Area and Visible-Light Performance

Catalysts ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 376 ◽  
Author(s):  
Liang Jiang ◽  
Yizhou Li ◽  
Haiyan Yang ◽  
Yepeng Yang ◽  
Jun Liu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Visible Light ◽  
Surface Area ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Nitrogen Doped ◽  
Sol Gel Synthesis

Sol-Gel Synthesis of N-Doped Mesoporous TiO2 with High Crystallinity and High Visible Light Photocatalytic Activity

2012 ◽  
Vol 217-219 ◽  
pp. 857-861 ◽  
Author(s):  
Xiao Ling Guo ◽  
Xiang Dong Wang ◽  
Feng He
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Area ◽  
Anatase Phase ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Weight Ratio ◽  
Mesoporous Tio2 ◽  
Vis Spectroscopy

N-doped mesoporous TiO2 with high surface area and crystallinity were synthesized by sol-gel method using polyacrylamide (PAM) and polyethylene glycol (PEG) as the complex templates. The resulting materials were characterized by XRD, TEM, N2 adsorption-desorption, and UV-Vis spectroscopy. It is found that when the weight ratio of PAM and PEG is 1:4, the sample, prepared at 600 °C in nitrogen and at 500 °C in air, is anatase phase and has high surface area and crystallinity. The particle size and pore size of the sample are about 10 nm and 17 nm respectively. Compared with that of the undoped mesoporous TiO2, the absorption band edges of N-doped samples exhibit an evident red-shift. The results of the photocatalytic degradation of methyl orange (MO) show that N-doped sample appears to have higher photocatalytic activity under visible light than undoped sample.

Recent Development on Titania Based Mixed Oxide Photocatalysts for Environmental Application under Visible Light

2012 ◽  
Vol 734 ◽  
pp. 186-214 ◽  
Author(s):  
Noor Aman ◽  
Trilochan Mishra
Keyword(s):  
Visible Light ◽  
Surface Area ◽  
Mixed Oxide ◽  
Photocatalytic Oxidation ◽  
Anatase Phase ◽  
High Surface ◽  
High Surface Area ◽  
Toxic Metal ◽  
Oxide Semiconductor ◽  
Environmental Application

In the recent years most of the studies are confined to the mixing of ZrO2, SiO2, WO4 or ceria with titania in different composition so as to stabilize anatase phase, maintain high surface area and increase visible light absorption for better photocatalytic activity. Method of synthesis also helps in effective doping and enhancing surface area of the resultant materials. Nonmetal doping of oxide semiconductor materials facilitates the visible light application of photocatalysis. Based on the recent literature this review elaborately discuss on the development of titania based mixed oxide catalyst with or without different doping for visible light application. In addition this review deals with critical analysis of these materials towards photocatalytic oxidation of organics and reduction of pollutants like toxic metal ions and nitrates.

Visible light-induced photocatalytic activity of high surface area N-doped two-dimensional (2-D) TiO2 sheets

RSC Advances ◽  
2015 ◽  
Vol 5 (107) ◽  
pp. 88464-88470 ◽  
Author(s):  
A. Nikhil ◽  
G. S. Anjusree ◽  
Shantikumar V. Nair ◽  
A. Sreekumaran Nair
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Visible Light Photocatalysis ◽  
Two Dimensional ◽  
Nitrogen Doped

Nitrogen-doped two-dimensional TiO2 sheets prepared by a titanate route using urea as the precursor for nitrogen for visible light photocatalysis.

scholarly journals Synthesis and Characterization of Carbon and Carbon-Nitrogen Doped Black TiO2 Nanomaterials and Their Application in Sonophotocatalytic Remediation of Treated Agro-Industrial Wastewater

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6175
Author(s):  
Saifur Rahman ◽  
Rab Nawaz ◽  
Javed Akbar Khan ◽  
Habib Ullah ◽  
Muhammad Irfan ◽  
...  
Keyword(s):  
Visible Light ◽  
Palm Oil ◽  
Anatase Phase ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Oxygen Demand ◽  
Electrical Energy ◽  
Black Tio2 ◽  
Palm Oil Mill

The conventional open ponding system employed for palm oil mill agro-effluent (POME) treatment fails to lower the levels of organic pollutants to the mandatory standard discharge limits. In this work, carbon doped black TiO2 (CB-TiO2) and carbon-nitrogen co-doped black TiO2 (CNB-TiO2) were synthesized via glycerol assisted sol-gel techniques and employed for the remediation of treated palm oil mill effluent (TPOME). Both the samples were anatase phase, with a crystallite size of 11.09–22.18 nm, lower bandgap of 2.06–2.63 eV, superior visible light absorption ability, and a high surface area of 239.99–347.26 m2/g. The performance of CNB-TiO2 was higher (51.48%) compared to only (45.72%) CB-TiO2. Thus, the CNB-TiO2 is employed in sonophotocatalytic reactions. Sonophotocatalytic process based on CNB-TiO2, assisted by hydrogen peroxide (H2O2), and operated at an ultrasonication (US) frequency of 30 kHz and 40 W power under visible light irradiation proved to be the most efficient for chemical oxygen demand (COD) removal. More than 90% of COD was removed within 60 min of sonophotocatalytic reaction, producing the effluent with the COD concentration well below the stipulated permissible limit of 50 mg/L. The electrical energy required per order of magnitude was estimated to be only 177.59 kWh/m3, indicating extreme viability of the proposed process for the remediation of TPOME.

Hard-templating synthesis and enhanced photocatalysis of mesoporous titanium dioxides nanoparticles

2018 ◽  
Vol 11 (04) ◽  
pp. 1850077 ◽  
Author(s):  
K. L. Jin ◽  
X. J. Chen ◽  
J. C. Xu ◽  
Y. S. Huang ◽  
Y. B. Han ◽  
...  
Keyword(s):  
Surface Area ◽  
Anatase Phase ◽  
High Surface ◽  
High Surface Area ◽  
Mesoporous Structure ◽  
Photocatalytic Decomposition ◽  
Titanium Dioxides ◽  
Decomposition Efficiency ◽  
Templating Synthesis ◽  
Mb Adsorption

Mesoporous titanium dioxides nanoparticles (TiO2 NPs) were synthesized using activated carbon (AC) as templates after the decomposition of AC. All results indicated that TiO2 NPs with the small grain size presented the anatase phase structure. Mesoporous TiO2 NPs showed the high surface area and the surface area decreased with the TiO2 content. The removal of methylene blue (MB) indicated that the photocatalytic decomposition efficiency of mesoporous TiO2 NPs increased up to 92% for three-times doping with the TiO2 content, and then decreased. This should be attributed to the synergistic effect from the MB adsorption of mesoporous-structure and the photocatalysis of TiO2 NPs. Therefore, the higher MB concentration near TiO2 NPs from the mesoporous-structure increased the touch chance and the MB photocatalytic decomposition was promoted greatly.

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