scholarly journals Synthesis of p-n CoO-ZnO Heterojunction for Enhanced Visible-Light Assisted Photodegradation of Methylene Blue

2021 ◽  
Author(s):  
Muhammad Saeed ◽  
Muhammad Adeel ◽  
Iltaf Khan ◽  
Nadia Akram ◽  
Majid Muneer
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Fluorescence Spectroscopy ◽  
Visible Light ◽  
Hydroxyl Radicals ◽  
Precipitation Method ◽  
Photocatalytic Efficiency ◽  
Visible Light Driven ◽  
Visible Irradiation

Abstract The synthesis of p-n heterojunction has received much attention in the eradication of organic pollutants from water. In this study, p-n CoO-ZnO heterojunction is reported as an efficient visible-light-driven photocatalyst for degradation of methylene blue. The formation of CoO-ZnO was determined by XRD, XPS, UV-vis DRS, SEM, and EDS analyses. The p-n CoO-ZnO prepared by precipitation method showed an enhanced photocatalytic activity under the irradiation of visible light compared to ZnO. A 100 mg/L methylene blue is degraded almost completely within 2 hours under visible irradiation. The enhanced photocatalytic efficiency is attributed to the synergistic effect of p-n heterojunction that dramatically reduces the recombination of holes and electrons initiated by irradiation. The role played by hydroxyl radicals in photodegradation of methylene blue was determined by photoluminescence emission and fluorescence spectroscopy.

scholarly journals Real roles of perylene diimides for improving photocatalytic activity

RSC Advances ◽  
2020 ◽  
Vol 10 (39) ◽  
pp. 23024-23037 ◽  
Author(s):  
Fengxia Zhang ◽  
Wenjing Li ◽  
Tianyi Jiang ◽  
Xuemei Li ◽  
Yuanyuan Shao ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Perylene Diimides ◽  
Photodegradation Rate ◽  
Composite Photocatalysts ◽  
Visible Light Driven

Three novel visible-light-driven composite photocatalysts were synthesized by hydrothermal method. The effects of introducing PDIs with different structures into TiO2 were evaluated by assaying the photodegradation rate of methylene blue.

ZnxCd1-xS/g-C3N4 nanocomposites: synthesis, characterization, and photocatalytic activity

2020 ◽  
Vol 98 (8) ◽  
pp. 441-444
Author(s):  
Xiaoyue Li ◽  
Limin Dong ◽  
Lianwei Shan ◽  
Xinxin Jin ◽  
Yingkui Guo
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Composite Materials ◽  
Synergistic Effect ◽  
Light Absorption ◽  
Catalytic Effect ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
Visible Light Absorption ◽  
Simple Chemical

In this work, we prepared ZnxCd1-xS/g-C3N4 nanocomposites with excellent catalytic effect by the simple chemical precipitation method. The ZnxCd1-xS/g-C3N4 composite with excellent effect of degrading methylene blue (MB) was prepared by adjusting the ratio of Zn to Cd. The Zn0.25Cd0.75S/g-C3N4 nanocomposites have the highest degradation efficiency, which can reach 92.25%. The specific surface area and visible light absorption range are increased by the synergistic effect of the combination of ZnxCd1-xS and g-C3N4. The ZnxCd1-xS/g-C3N4 nanocomposites prepared by this study with excellent photocatalytic properties provide a method for the preparation of new composite materials in the future.

Quantum-sized BiVO4 modified TiO2 microflower composite heterostructures: efficient production of hydroxyl radicals towards visible light-driven degradation of gaseous toluene

2015 ◽  
Vol 3 (43) ◽  
pp. 21655-21663 ◽  
Author(s):  
Juanjuan Sun ◽  
Xinyong Li ◽  
Qidong Zhao ◽  
Moses O. Tadé ◽  
Shaomin Liu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydroxyl Radicals ◽  
Efficient Production ◽  
Electron Hole ◽  
Visible Light Driven ◽  
Gaseous Toluene ◽  
High Separation

The enhanced photocatalytic activity of the quantum-BiVO4/TiO2 composite was mainly attributed to the high separation of photo-induced electron–hole pairs and the efficient production of hydroxyl radicals.

scholarly journals Synergistic effect of Ni–Ag–rutile TiO2 ternary nanocomposite for efficient visible-light-driven photocatalytic activity

RSC Advances ◽  
2020 ◽  
Vol 10 (60) ◽  
pp. 36930-36940 ◽  
Author(s):  
Petri M. Leukkunen ◽  
Ekta Rani ◽  
Assa Aravindh Sasikala Devi ◽  
Harishchandra Singh ◽  
Graham King ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Visible Light ◽  
Light Absorption ◽  
Charge Separation ◽  
Effective Charge ◽  
Energy Dispersive ◽  
Intimate Contact ◽  
Visible Light Absorption ◽  
Visible Light Driven

Robust photocatalytic activity of Ni–Ag–RTiO2 is attributed to the improved visible light absorption and effective charge separation due to intimate contact between Ni and RTiO2via Ag, as evidenced by Ti3+ in Ti 2p XPS and energy dispersive mapping.

Hydrothermal formation of N/Ti3+ codoped multiphasic (brookite–anatase–rutile) TiO2 heterojunctions with enhanced visible light driven photocatalytic performance

2017 ◽  
Vol 46 (45) ◽  
pp. 15727-15735 ◽  
Author(s):  
Mingxuan Sun ◽  
Yuanyuan Kong ◽  
Yalin Fang ◽  
Swati Sood ◽  
Yuan Yao ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Rutile Tio2 ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Driven ◽  
Visible Light Photocatalytic

Multiphasic TiO2 heterojunctions codoped with N and Ti3+ were fabricated and their enhanced visible light photocatalytic activity for the degradation of methylene blue was demonstrated.

scholarly journals Superparamagnetic and photocatalytic activity of CoCe0.02Dy0.02Fe1.96O4 nanoparticles synthesized by citrate-gel autocombustion technique

2019 ◽  
Vol 9 (4) ◽  
pp. 4164-4167 ◽  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Charge Separation ◽  
Analytical Techniques ◽  
Photocatalytic Efficiency ◽  
Semiconducting Materials ◽  
Light Utilization ◽  
Spin Glass Behaviour ◽  
Degussa P25

Mitigating organic pollutants by employing semiconducting materials is considered to be green and sustainable route to tackle the environmental problems. Herein, citrate-gel autocombustion method was adopted to synthesize Ce and Dy doped CoFe2O4 and characterized by various analytical techniques. The efficacy of prepared CoCexDyxFe2-2xO4 (x=0-0.04) samples were tested for degradation of Methylene blue (MB) under visible light irradiation. The photocatalytic efficiency of CoCe0.02Dy0.02Fe1.96O4 for degradation of MB was found to be larger than pure CoFe2O4, Degussa P25 and other modified CoFe2O4. The enhanced photocatalytic activity was attributed to improved charge separation and visible light utilization by Ce and Dy into CoFe2O4 system. The super-spin glass behaviour of CoCexDyxFe2-2xO4 confirmed from flat nature of magnetization of FC curve below TB.

Liquid-Phase Synthesis of NiO-Loaded Ag Nanoparticles and Enhanced Photo-Degradation Performance

2011 ◽  
Vol 287-290 ◽  
pp. 145-149 ◽  
Author(s):  
Zong Min Tian ◽  
Xu Xiang ◽  
Zhi Wei Li ◽  
Feng Li
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Liquid Phase ◽  
Visible Light ◽  
Ag Nanoparticles ◽  
Precipitation Method ◽  
Phase Precipitation ◽  
Photo Degradation ◽  
Nano Structure ◽  
Phase Synthesis

We have synthesized layered Ni(OH)2via a facile liquid-phase precipitation method. NiO with a micro/nano-structure was obtained via calcining Ni(OH)2precursor at 350°C. The as-prepared NiO was utilized as a support to load Ag nanocrystals. SEM and TEM observations showed that Ag nanoparticles were homogeneously distributed onto NiO support and the Ag nanoparticles have sizes of 4-5 nm. The photocatalytic activity of NiO-loaded Ag was investigated by the photodegradation of methylene blue (MB) under the irradiation of visible light. The results suggest that the loading of Ag nanoparticles can enhance the photo-degradation performance of pristine NiO.

Enhanced visible-light-driven photocatalysis from WS2 quantum dots coupled to BiOCl nanosheets: synergistic effect and mechanism insight

2018 ◽  
Vol 8 (1) ◽  
pp. 201-209 ◽  
Author(s):  
Peiyuan Xiao ◽  
Jufeng Lou ◽  
Huixian Zhang ◽  
Weili Song ◽  
Xi-Lin Wu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Visible Light ◽  
Visible Light Driven

Novel 0D/2D heterojunctions of WS2 QDs/BiOCl exhibited enhanced visible-light driven photocatalytic activity.

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