Cosolvent-free nanocasting synthesis of ordered mesoporous g-C3N4 and its remarkable photocatalytic activity for methyl orange degradation

Ordered mesoporous g-C3N4, synthesized via a green cosolvent-free nanocasting route, exhibited remarkable photodegradation performance towards methyl orange with a degradation rate constant 30 times higher than that of bulk g-C3N4.

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The Role of H2C2O4 and Na2CO3 as Precipitating Agents on The Physichochemical Properties and Photocatalytic Activity of Bismuth Oxide

Open Chemistry ◽

10.1515/chem-2020-0013 ◽

2020 ◽

Vol 18 (1) ◽

pp. 129-137

Author(s):

Yayuk Astuti ◽

Rizka Andianingrum ◽

Abdul Haris ◽

Adi Darmawan ◽

Keyword(s):

Photocatalytic Activity ◽

Methyl Orange ◽

Physicochemical Properties ◽

Bismuth Oxide ◽

Rate Constants ◽

Degradation Rate ◽

Precipitation Method ◽

Methyl Orange Degradation ◽

Methyl Orange Dye

AbstractSynthesis of bismuth oxide synthesis through the precipitation method using H2C2O4 and Na2CO3 precipitating agents, identification of physicochemical properties and its photocatalysis activity for methyl orange degradation were conducted. The bismuth oxide synthesis was undertaken by dissolving Bi(NO3)3.5H2O in HNO3, then added precipitating agents to form precipitate. The results showed that bismuth oxide produced by H2C2O4 precipitating agent was a yellow powder containing a mixture of α-Bi2O3 (monoclinic) and β-Bi2O3 (tetragonal), porous with size of 28-85 μm. Meanwhile, the use of Na2CO3 as precipitating agent resulted in bismuth oxide consisting of α-Bi2O3 and β-Bi2O3 and Bi2O4, irregular shape without pore being 40-115 μm in size. Bismuth oxide synthesized with H2C2O4 precipitating agent showed higher photocatalytic activity compared to bismuth oxide synthesized using Na2CO3 on degrading methyl orange dye with degradation rate constants of 2.35x10-5 s-1 for H2C2O4 and 1.81x10-5 s-1 for Na2CO3.

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Design of ordered mesoporous H3PW12O40-titania materials and their photocatalytic activity to dye methyl orange degradation

Catalysis Communications ◽

10.1016/j.catcom.2010.03.004 ◽

2010 ◽

Vol 11 (9) ◽

pp. 839-843 ◽

Cited By ~ 53

Author(s):

Kexin Li ◽

Yingna Guo ◽

Fengyan Ma ◽

Huichao Li ◽

Ling Chen ◽

...

Keyword(s):

Photocatalytic Activity ◽

Methyl Orange ◽

Methyl Orange Degradation ◽

Ordered Mesoporous

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Photocatalytic Methyl Orange Degradation on TiO2-NaX Composite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.129-131.804 ◽

2010 ◽

Vol 129-131 ◽

pp. 804-807

Author(s):

Hong Wang ◽

Yang Yu ◽

Wen Jie Zhang

Keyword(s):

Photocatalytic Activity ◽

Methyl Orange ◽

Solid State ◽

Degradation Rate ◽

Pure Tio2 ◽

Methyl Orange Degradation ◽

Maximum Value ◽

Photocatalytic Activities ◽

Addition Amount ◽

Better Than

Photocatalytic activities of simple mixture of TiO2 and NaX, and TiO2-NaX composite prepared by solid-state dispersion method were investigated. Methyl orange degradation rate increased sharply when TiO2 concentration was low and reached its maximum value at TiO2 concentration of 200 mg/l when using pure TiO2. After 120 min of irradiation, methyl orange degradation rate could reach 98.4%, which means nearly all of the dye degraded after two hours. The photocatalytic activity of TiO2 and NaX simple mixture increased with increasing amount of NaX up to 60.4% when NaX amount was 1.4 g/l. The composite TiO2-NaX prepared by grinding had lower activity at various NaX addition amount. The photocatalytic activity of composite TiO2-NaX prepared by solid-state dispersion was better than the composite before calcination. However, the maximum degradation rate was only 41.2%, which was still lower than pure TiO2.

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TiO2-HY(FeY) Composites Used as Photocatalysts on Methyl Orange Degradation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.129-131.848 ◽

2010 ◽

Vol 129-131 ◽

pp. 848-852

Author(s):

Li Li Yang ◽

Jia Wei Bai ◽

Wen Jie Zhang

Keyword(s):

Photocatalytic Activity ◽

Methyl Orange ◽

Solid State ◽

Degradation Rate ◽

Pure Tio2 ◽

Y Zeolite ◽

Dispersion Method ◽

Methyl Orange Degradation ◽

Maximum Value ◽

Wide Range

Photocatalytic activity of simple mixture of TiO2 and HY(FeY), and TiO2-HY(FeY) composite prepared by solid-state dispersion method were investigated to study the effect of Y zeolite addition on TiO2 activity. Methyl orane degradation rate increased sharply with increasing TiO2 amount at low photocatalyst concentration until it reached the maximum value when TiO2 concentration was 200 mg/l. In the wide range of HY(FeY) content, TiO2-HY(FeY) composite prepared by solid-state dispersion method showed weaker photocatalytic activity on methyl orange degradation compared with pure TiO2. When TiO2:HY ratio was 10:5, the maximum methyl orange degradation rate was 51.2% in the simple mixture of TiO2 and HY. When TiO2:FeY ratio was 10:7 in the simple mixture of TiO2 and FeY, the optimum methyl orange degradation rate was 60.9%, which was a little higher than that of TiO2.

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Photocatalytic Degradation of Methyl Orange on the Composite of TiO2 and Lanthanum Niobate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.213.63 ◽

2011 ◽

Vol 213 ◽

pp. 63-67

Author(s):

Wen Jie Zhang ◽

Xin Sun ◽

Nan Ge

Keyword(s):

Photocatalytic Activity ◽

Methyl Orange ◽

Degradation Rate ◽

Methyl Orange Solution ◽

Solid State Reaction Method ◽

Pure Tio2 ◽

Composite Photocatalyst ◽

Methyl Orange Degradation ◽

Orange Solution ◽

Degradation Of Methyl Orange

In order to improve the photocatalytic activity of TiO2, the optimal catalytic conditions of TiO2 and niobate as well as the composite TiO2 and niobate photocatalyst were studied. 10 mg/l of methyl orange solution was taken as imitated waste water. The results indicated that the optimum dosage of TiO2 was 0.8 g/l. The optimal calcination temperature to prepare lanthanum niobate was 900 oC. n(La):n(Nb) was in the range of 0.6:1−3:1, and the photocatalyst prepared in the ratio of 1.4:1 showed the highest activity. The results also showed that, TiO2-lanthanum niobate composite prepared by solid-state reaction method showed better photocatalytic activity on methyl orange degradation compared with pure TiO2. After 120 minutes of irradiation, methyl orange degradation rate reached 94.2 % when using the composite photocatalyst.

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The Study on the Influential Factors of Photocatalytic Performance of Eosin-Sensitized TiO2 Nanoparticles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.827.3 ◽

2013 ◽

Vol 827 ◽

pp. 3-7

Author(s):

Shun Jiang He ◽

Xue Yan Du ◽

Qiao Wang ◽

Jing Xu

Keyword(s):

Photocatalytic Activity ◽

Methyl Orange ◽

Photocatalytic Degradation ◽

Degradation Rate ◽

Photocatalytic Performance ◽

Influential Factors ◽

Sunlight Irradiation ◽

Sensitization Time

The photocatalytic activity of eosin-sensitized TiO2 nanoparticles on photocatalytic degradation rate (PDR) of methyl orange under sunlight irradiation was studied. The influential factors on the degradation, such as eosin concentration, TiO2 dosage, sensitization time and sensitization temperature were also investigated. The results show that: The performance of TiO2 nanoparticles for PDR of methyl orange has been improved obviously for eosin sensitizing. The PDR of methyl orange reached 45.28% under the conditions of eosin concentration of 20mg/L, TiO2 dosage of 0.5000g/L, sensitization time of 24h and sensitization temperature of 20°C.

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Sensitivity analysis using a diffuse pollution hydrologic model to assess factors affecting pesticide concentrations in river water

Water Science & Technology ◽

10.2166/wst.2010.540 ◽

2010 ◽

Vol 62 (11) ◽

pp. 2579-2589 ◽

Cited By ~ 3

Author(s):

Koji Tani ◽

Yoshihiko Matsui ◽

Kentaro Narita ◽

Koichi Ohno ◽

Taku Matsushita

Keyword(s):

Sensitivity Analysis ◽

River Water ◽

Rate Constant ◽

Degradation Rate ◽

Hydrologic Model ◽

Adsorption Coefficient ◽

Pesticide Concentration ◽

Artificial Drainage ◽

Degradation Rate Constant ◽

Intermittent Irrigation

We quantitatively evaluated the factors that affect the concentrations of rice-farming pesticides (an herbicide and a fungicide) in river water by a sensitivity analysis using a diffuse pollution hydrologic model. Pesticide degradation and adsorption in paddy soil affected concentrations of the herbicide pretilachlor but did not affect concentrations of the fungicide isoprothiolane. We attributed this difference to the timing of pesticide application in relation to irrigation and drainage of the rice paddy fields. The herbicide was applied more than a month before water drainage of the fields and runoff was gradual over a long period of time, whereas the fungicide was applied shortly before drainage and runoff was rapid. However, the effects of degradability-in-water on the herbicide and fungicide concentrations were similar, with concentrations decreasing only when the rate constant of degradation in water was large. We also evaluated the effects of intermittent irrigation methods (irrigation/artificial drainage or irrigation/percolation) on pesticide concentrations in river water. The runoff of the fungicide, which is applied near or in the period of intermittent irrigation, notably decreased when the method of irrigation/artificial drainage was changed to irrigation/percolation. In a sensitivity analysis evaluating the synergy effect of degradation and adsorbability in soil, the degradation rate constant in soil greatly affected pesticide concentration when the adsorption coefficient was small but did not affect pesticide concentration when the adsorption coefficient was large. The pesticide concentration in the river water substantially decreased when either or both the degradation rate constant in soil and adsorption coefficient was large.

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