Synthesis, thermal stability, and photocatalytic activity of nanocrystalline gallium nitride via the reaction of Ga2O3 and NH4Cl at low temperature

Zhang, Hong; Chen, Youjian; Fu, Li; Ma, Jing

doi:10.1016/j.jallcom.2010.03.185

Cited by 17 publications

(6 citation statements)

References 26 publications

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“…The poor performance of Ga 2 O 3 could be due to glass absorption of the UV-C radiation from 30 to 10 mW·cm −2 , even with the use of PYREX glass. Zhang et al [12] also reported a ow catalytic activity for gallium oxide, being necessary l 8 h irradiation using a 300 W lamp to obtain degradation of similar compounds. Hou et al [19] revealed that β-Ga 2 O 3 sample prepared with ethylene glycol showed the highest photocatalytic activity and this could be due to high surface area, abundant hydroxyl groups, and wide band gap in this case.…”

Section: Resultsmentioning

confidence: 97%

“…This material has much wider bandgap (4.8 eV) than TiO 2 doing that photogenerated electrons in the conductive band have much higher reductive capability. β-Ga 2 O 3 is also an environmental friendly material according to Worksafe Australia criteria and some authors reported that it appears to be selective on the photocatalytic degradation of aromatics compounds, like benzene [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of TiO2, ZnO, CuO and Ga2O3 on the Photocatalytic Degradation of Phenol Using an Annular-Flow Photocatalytic Reactor

Paschoalino¹,

Paschoalino²,

Jordão³

et al. 2012

OJPC

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Even with rigorous environmental regulations, phenol still is a major contaminant. One possible solution is the use of heterogeneous photocatalysis due to low chemical addition, feasibility and reliability to be implanted on cost-effective industrial process. TiO 2 is the most employed photocatalyst because of its favorable (photo) chemical properties and ZnO is considered one of the best alternative for that. Other oxides were tested in lesser proportions, like CuO and Ga 2 O 3 . When the photocatalyst is dispersed as slurry, higher degradation rates are achieved due to high solid to liquid contact area when compared with supported form. The aim of this work was to develop a batch recirculating photocatalytic reactor and evaluate its efficiency when assisted by the photocatalysts TiO 2 P25, ZnO, CuO and β-Ga 2 O 3 . TiO 2 achieved 95% mineralization after 200 min reaction in an average degradation rate of 0.68 mg·L ). Ga 2 O 3 and CuO presented poor performance, mainly due to low surface area for the CuO syntesized and the absorption of the UV radiation by the reactor walls, decreasing Ga 2 O 3 activity. Degradation intermediates were detected in diverse concentrations and at different operational times for each oxide tested, which indicate different degradation mechanisms.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Evaluation of TiO2, ZnO, CuO and Ga2O3 on the Photocatalytic Degradation of Phenol Using an Annular-Flow Photocatalytic Reactor

Paschoalino¹,

Paschoalino²,

Jordão³

et al. 2012

OJPC

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“…• C [27,28]. HCl molecules are significantly transported to the CaSi 2 crystals, thus the nanosheets are effectively formed by the direct dissociation of the source materials.…”

Section: Fig 4 (A-d) Sem Images Of the Fecl2-treated Nanosheetsmentioning

confidence: 99%

Formation of Si-based Nanosheet Bundles and Morphological Modication of CaSi2 Crystals by Thermal Treatment Using Chloride Compounds

Meng

Yuan

Hayakawa

et al. 2018

e-J. Surf. Sci. Nanotech.

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Si-based nanosheet bundles were formed by Ca-atom extraction from CaSi2 crystals by thermal treatment using FeCl2, FeCl3, NH4Cl, and MgCl2. The morphological property of the Si-based nanosheet bundles was examined. Though the Si-based nanosheets were formed under the stated thermal treatment conditions using FeCl3, the formation of iron-oxide phases was accelerated at higher temperatures and longer duration times for the highest thermal treatment temperatures using FeCl2. Thinner and thicker nanosheets were obtained using NH4Cl and MgCl2, respectively. The morphological properties of the Si-based nanosheet bundles were compared to each other and their formation mechanism was discussed in terms of the thermal instability of the chlorides, their vapor pressure and thermal treatment temperature profiles.

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“…Solid state metathesis (SSM) reactions have been used to prepare metal nitrides, which involve using an organic reagent cyanamide and Ga 2 O 3 as precursors [7], mechanical treatment of Ga 2 O 3 and lithium nitride under NH 3 gas [8], reaction of gallium oxide with the carbonitride at 850 8C [9], and reactions between metal halides and alkali or alkaline earth nitrides such as Li 3 N, Mg 3 N 2 , Ca 3 N 2 and NaN 3 [10]. Recently, Ma and co-workers synthesized GaN from Ga 2 O 3 and NH 4 Cl at 650 8C [11]. Solid-state synthesis in a stainless steel autoclave is favorable for the synthesis of nitrides at relatively low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Low temperature solid-state synthesis of nanocrystalline gallium nitride

Wang

Shi

et al. 2012

Materials Research Bulletin

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Synthesis, thermal stability, and photocatalytic activity of nanocrystalline gallium nitride via the reaction of Ga2O3 and NH4Cl at low temperature

Cited by 17 publications

References 26 publications

Evaluation of TiO<sub>2</sub>, ZnO, CuO and Ga<sub>2</sub>O<sub>3</sub> on the Photocatalytic Degradation of Phenol Using an Annular-Flow Photocatalytic Reactor

Evaluation of TiO<sub>2</sub>, ZnO, CuO and Ga<sub>2</sub>O<sub>3</sub> on the Photocatalytic Degradation of Phenol Using an Annular-Flow Photocatalytic Reactor

Formation of Si-based Nanosheet Bundles and Morphological Modication of CaSi<sub>2 </sub>Crystals by Thermal Treatment Using Chloride Compounds

Low temperature solid-state synthesis of nanocrystalline gallium nitride

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Synthesis, thermal stability, and photocatalytic activity of nanocrystalline gallium nitride via the reaction of Ga2O3 and NH4Cl at low temperature

Cited by 17 publications

References 26 publications

Evaluation of TiO&lt;sub&gt;2&lt;/sub&gt;, ZnO, CuO and Ga&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; on the Photocatalytic Degradation of Phenol Using an Annular-Flow Photocatalytic Reactor

Evaluation of TiO&lt;sub&gt;2&lt;/sub&gt;, ZnO, CuO and Ga&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; on the Photocatalytic Degradation of Phenol Using an Annular-Flow Photocatalytic Reactor

Formation of Si-based Nanosheet Bundles and Morphological Modication of CaSi<sub>2 </sub>Crystals by Thermal Treatment Using Chloride Compounds

Low temperature solid-state synthesis of nanocrystalline gallium nitride

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Evaluation of TiO<sub>2</sub>, ZnO, CuO and Ga<sub>2</sub>O<sub>3</sub> on the Photocatalytic Degradation of Phenol Using an Annular-Flow Photocatalytic Reactor

Evaluation of TiO<sub>2</sub>, ZnO, CuO and Ga<sub>2</sub>O<sub>3</sub> on the Photocatalytic Degradation of Phenol Using an Annular-Flow Photocatalytic Reactor