MOF composites derived BiFeO3@Bi5O7I n-n heterojunction for enhanced photocatalytic performance

2022 ◽  
Author(s):  
Yu Zhu ◽  
ChuWen Li ◽  
DongMei Hou ◽  
Guicheng Gao ◽  
WeiQi Luo ◽  
...  
Keyword(s):  
Composite Material ◽  
High Temperature ◽  
Photocatalytic Degradation ◽  
Photocatalytic Performance ◽  
Removal Rate ◽  
Wide Bandgap ◽  
Photocatalytic Efficiency ◽  
High Adsorption ◽  
Excellent Performance ◽  
High Adsorption Capacity

Abstract BiFeO3 is a photocatalyst with excellent performance. However, its applications are limited due to its wide bandgap. In this paper, MIL-101(Fe)@BiOI composite material is synthesized by hydrothermal method and then calcined at high temperature to obtain BiFeO3@Bi5O7I composite material with high adsorption capacity. Among them, An n-n heterojunction is formed, which improves the efficiency of charge transfer, and the recombination of photo-generated electrons and holes prevents the improvement of photocatalytic efficiency and stability. The result of photocatalytic degradation of tetracycline under visible light irradiation showed, BiFeO3@Bi5O7I (1:2) has the best photodegradation effect, with a removal rate of 86.4%, which proves its potential as a photocatalytic degradation material.

scholarly journals Study on influencing factors of photocatalytic performance of CdS/TiO2 nanocomposite concrete

2020 ◽  
Vol 9 (1) ◽  
pp. 1160-1169
Author(s):  
Kang He ◽  
Yu Chen ◽  
Mengjun Mei
Keyword(s):  
High Temperature ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Catalytic Efficiency ◽  
High Energy ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Light Sources ◽  
Photocatalytic Efficiency ◽  
Photocatalytic Concrete

AbstractIn this study, a high-energy ball mill was used to composite nano-TiO2 and CdS, and three kinds of nanocomposite photocatalysts TiO2, CdS/TiO2-R400, and CdS/TiO2-R600 were prepared, which can respond to visible light. The photocatalytic concrete test block was prepared by mixing the nanocomposite photocatalyst and other masses with cement by incorporation method. To study the effect of the photocatalyst content on the photocatalytic performance of nanoconcrete, a total of four catalyst contents (0, 2%, 5%, and 8%) were set. The effects of high-temperature treatment (400°C) and different light sources (ultraviolet and visible light) on photocatalytic efficiency were also considered. The results show that the catalytic efficiency of CdS/TiO2-R400 under two light sources is higher than that of the other two photocatalysts. Compared to ultraviolet light sources, the photocatalytic efficiency of CdS/TiO2 nanocomposite concrete under visible light is lower, and the efficiency is below 9%. The optimal amounts of CdS/TiO2 nanocomposite photocatalyst under ultraviolet and visible light are 2% and 5%, respectively. The high-temperature treatment can improve the photocatalytic performance of CdS/TiO2 nanocomposite photocatalyst by 2% to 3%.

Calcination Temperature Influence on the Microstructure and the Photocatalytic Properties of TiO2 Pillared Rectorite

2011 ◽  
Vol 197-198 ◽  
pp. 790-795
Author(s):  
Zong Wu Wei ◽  
Jian Hua Chen ◽  
Mei Qun Lin ◽  
Ye Chen
Keyword(s):  
Photocatalytic Activity ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Photocatalytic Reaction ◽  
Photocatalytic Efficiency ◽  
Temperature Influence ◽  
High Adsorption ◽  
Bet Analysis ◽  
High Adsorption Capacity ◽  
Xrd Patterns

TiO2 pillared rectorite (TPLR) had been synthesized by sol-gel method, and was characterized by XRD, TEM, BET, UV-vis DRS and FTIR. The effects of calcination temperature on the microstructure and the photocatalytic activity of the as prepared catalyst were investigated. The photocatalytic activity of the catalyst was evaluated by decomposition of Acid Red B (ARB) aqueous solution. XRD patterns revealed that TiO2 is incorporated into the interlayer of the rectorite. TEM demonstrated that TiO2 particles are present in the rectorite. The BET analysis indicated that the surface area of the sample calcined at 300°C (TPLR-300) was larger than those of other samples. The TPLR samples had high adsorption capacity and good photocatalytic efficiency in decomposition of ARB in water. FTIR spectra of the original and the recovered samples indicated that the catalyst had not chemically changed during the photocatalytic reaction.

A ligand-anchored optical composite material for efficient vanadium(ii) adsorption and detection in wastewater

2019 ◽  
Vol 43 (26) ◽  
pp. 10324-10335 ◽  
Author(s):  
Ahmed Shahat ◽  
Hassan M. A. Hassan ◽  
M. F. El-Shahat ◽  
Osama El Shahawy ◽  
Md. Rabiul Awual
Keyword(s):  
Composite Material ◽  
Adsorption Capacity ◽  
High Adsorption ◽  
Key Factor ◽  
High Adsorption Capacity

A ligand-anchored composite material was prepared for vanadium (V(ii)) ion capturing. The pH was found to be a key factor in both detection and removal operations. The composite material exhibited the high adsorption capacity of 492.61 mg g−1.

Preparation and Photocatalytic Performance of TiO2/Modified Expandable Graphite Composite Material

2014 ◽  
Vol 618 ◽  
pp. 76-80
Author(s):  
Hong Lun Wang ◽  
Qin Deng ◽  
Hui Liu ◽  
Yan Zi Zhou ◽  
Yan Zong Zhang
Keyword(s):  
Composite Material ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Expandable Graphite ◽  
Graphite Composite ◽  
Gel Method ◽  
Photocatalytic Effect ◽  
Better Than

In this paper, TiO2/modified expandable graphite composite material was prepared through sol-gel method with the carrier of modified expandable graphite.The influence of this composite material prepared in different calcination environment and with different times of load on the effect of methyl orange solution’s photocatalytic degradation was studied. Results show that the photocatalytic effect is better by using the composite material with the same times of load in aerobic calcination than that in anaerobic calcination. In the same calcination environment, the photocatalytic effect with 5 times of load is better than that with 1, 2, 3 and 4 times of load. Whether in the aerobic calcination or in the anaerobic calcination, the photocatalytic effect is better if the composite material is loaded 5 times.

Preparation and Characterization of TiO2/Coconut-Activated Carbon Photocatalytic Materials

2014 ◽  
Vol 1015 ◽  
pp. 667-670
Author(s):  
Chuan Bao Zhao ◽  
Dong Mei Shi ◽  
Bo Tao Lin ◽  
Yan Qiang Jia
Keyword(s):  
Composite Material ◽  
Activated Carbon ◽  
Adsorption Capacity ◽  
Photocatalytic Performance ◽  
Photocatalytic Efficiency ◽  
Use Of Technology ◽  
Photocatalytic Materials

Using Ti (OC4H9)4 as the precursor,and GAC as carrier, making use of technology of hydrolyzation and natural assembling,TiO2/GAC composite material was preparated at the lower temperature.The characterization of obtained TiO2 /Coconut-Activated Carbon’scrystal structure and appearance by XRD and SEM.The adsorption capacity and photocatalytic performance on phenol were measured.Results show that TiO2/GAC surface was well-distributed and remains a little interspace.A nanocrystal TiO2 aerogel size is without 30nm.The sample shows lower adsorption compared to GAC.But photocatalytic efficiency was higher than GAC under the exposure of the sunlight or the violet.

Synthesis of Bi2MoO6/BiOI Composites for Visible Light Driven Photocatalytic Degradation of Methylene Blue

2021 ◽  
Vol 13 (4) ◽  
pp. 545-549
Author(s):  
You Zhang ◽  
Ning Xie ◽  
Lu Zhang ◽  
Fenghuang Wu ◽  
Zifei Xie ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Photocatalytic Performance ◽  
Solvothermal Method ◽  
Photocatalytic Efficiency ◽  
Photogenerated Electrons ◽  
Visible Light Driven ◽  
Photocatalytic Performances

Bi2MoO6/BiOI composites were synthesized by solvothermal method and photocatalytic performances were evaluated by degrading methylene blue (MB). Experiment results show that Bi2MoO6/0.5BiOI has the best photocatalytic efficiency for eliminating 92% MB in 2 h under the excitation of visible light. Such superior photocatalytic performance is due to the significantly enhanced ability to absorb visible light and separated efficiency of photogenerated electrons and holes.

Fabrication of a high-adsorption N–TiO2/Bi2MoO6 composite photocatalyst with a hierarchical heterostructure for boosted weak-visible-light photocatalytic degradation of tetracycline

CrystEngComm ◽  
2020 ◽  
Vol 22 (33) ◽  
pp. 5481-5490
Author(s):  
Liruhua Zhang ◽  
Qianhong Shen ◽  
LiXing Yu ◽  
Feilong Huang ◽  
Changteng Zhang ◽  
...  
Keyword(s):  
Composite Material ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Structure Property ◽  
High Adsorption ◽  
Composite Photocatalyst ◽  
Structure Property Relationship ◽  
Relationship Of ◽  
Visible Light Photocatalytic

TiO2 hierarchical heterostructure photocatalyst was successfully fabricated through the in situ growth of Bi2MoO6 nanosheets on rough N–TiO2 nanorods with a bark-like surface. The structure–property relationship of this composite material were researched.

scholarly journals Effect of ball milling process on the photocatalytic performance of CdS/TiO2 composite

2020 ◽  
Vol 9 (1) ◽  
pp. 558-567 ◽  
Author(s):  
Mengya Ye ◽  
Jiahui Pan ◽  
Zhan Guo ◽  
Xiaoyu Liu ◽  
Yu Chen
Keyword(s):  
High Temperature ◽  
Photocatalytic Degradation ◽  
Ball Milling ◽  
Uv Irradiation ◽  
Photocatalytic Performance ◽  
Milling Process ◽  
Degradation Efficiency ◽  
Ball Milling Process ◽  
Composite Photocatalysts ◽  
High Temperature Calcination

AbstractCdS/TiO2 composite photocatalysts were made by the method of secondary ball milling at different ball milling speeds, milling time, and material ratios. After the secondary ball milling process, parts of the samples were calcined at high temperatures. X-ray diffraction (XRD) and UV-Vis diffuse reflectance spectroscopy (DRS) were used to observe the powder particle size, structural defect, bandgap, and absorption spectrum of the samples. Combined with the observation results, the effects of ball milling speed, time, material ratio, and high-temperature calcination on the photocatalytic performance of CdS/TiO2 composite samples were analyzed. Furthermore, the methyl orange (MO) was chosen to simulate pollutants, and the photocatalytic degradation rate of CdS/TiO2 composite photocatalysts for MO was evaluated under sunlight and UV irradiation conditions. The photocatalytic degradation efficiency of CdS/TiO2 photocatalyst under UV irradiation is much higher than that under sunlight irradiation. The experimental results reveal that secondary ball milling can effectively promote the formation of CdS/TiO2 composite nanostructure and the high-temperature calcination can reduce the bandgap width, which makes the samples easier to be excited. When the ball milling speed, time, and material ratio were respectively 400 rpm, 10 h, 25:75, and then calcined at high temperature, after 2 h of irradiation under UV light, CdS/TiO2 composite photocatalysts exhibited maximum photocatalytic degradation efficiency of 57.84%.

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