Manipulation on ZnO heterostructures: from binary ZnO–Ag to ternary ZnO–Ag–polypyrrole

CrystEngComm ◽  
2014 ◽  
Vol 16 (48) ◽  
pp. 10943-10948 ◽  
Author(s):  
Juan Li ◽  
Jian Yan ◽  
Chengzhan Liu ◽  
Lihong Dong ◽  
Hui Lv ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Uv Irradiation ◽  
Zinc Acetate ◽  
Catalytic Performance ◽  
Polymerization Process ◽  
Fast Reaction ◽  
Ternary Composite ◽  
Surface Polymerization

A ternary composite ZnO–Ag–polypyrrole was synthesized through a fast reaction between zinc acetate and hexamethylenetetramine followed by an in situ surface polymerization process. The sample exhibited a superior catalytic performance in the degradation of methylene blue under both UV irradiation and visible light.

In-situ constructing visible light CdS/Cd-MOF photocatalyst with enhanced photodegradation of methylene blue

Particuology ◽  
2021 ◽  
Author(s):  
Cheng Jing ◽  
Yufei Zhang ◽  
Junjie Zheng ◽  
Shengsong Ge ◽  
Jing Lin ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light

scholarly journals Synthesis and characterization of black TiO2/graphene composites with enhanced photocatalysis

2020 ◽  
Author(s):  
Zhaoqing Li ◽  
Zhufeng Liu ◽  
Xiao Yang ◽  
Peng Chen ◽  
Lei Yang ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Photogenerated Electron ◽  
Catalytic Performance ◽  
Attractive Potential ◽  
Electron Hole ◽  
Hole Recombination

Abstract According to the composite design, a series of black TiO2/graphene composites were synthesized to improve its photocatalytic activity. TiO2 is generated in situ on the surface of graphene by a facile sol-gel method. The combination of graphene and TiO2 was beneficial for eliminating the opportunity of photogenerated electron-hole recombination due to the excellent conductivity of graphene. In the subsequent hydrogenation process, the self-doping Ti3+ was introduced accompanied by the crystallization of amorphous TiO2. The narrowed bandgap caused by self-doping Ti3+ enhanced the visible light absorption and make the composites appear black. Both of them improved the photocatalytic performance of the synthesized black TiO2/graphene composites. The band structure of the composite was analyzed by valence band XPS, revealing the reason for the high visible light catalytic performance of the composite. The results proved that the black TiO2/graphene composites synthesized show attractive potential for applications in environmental and energy issues.

Hierarchical Cu2S nanorods with different crystal phases for asymmetrical supercapacitors and visible-light photocatalysis

2018 ◽  
Vol 47 (42) ◽  
pp. 15189-15196 ◽  
Author(s):  
Qun Liu ◽  
Xiaodan Hong ◽  
Xin Zhang ◽  
Xingyan You ◽  
Xin Zhao ◽  
...  
Keyword(s):  
Visible Light ◽  
Catalytic Performance ◽  
Electrochemical Activity ◽  
Visible Light Photocatalysis ◽  
Hexagonal Crystal ◽  
Crystal Phases ◽  
Excellent Catalytic Performance

Hierarchical structured Cu2S nanorods with monoclinic and hexagonal crystal phases are in situ grown on copper sheets, showing remarkable electrochemical activity in supercapacitors and excellent catalytic performance in photocatalysis.

scholarly journals Enhanced Visible-Light Photocatalysis of Nanocomposites of Copper Oxide and Single-Walled Carbon Nanotubes for the Degradation of Methylene Blue

Catalysts ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 297 ◽  
Author(s):  
Kamal Prasad Sapkota ◽  
Insup Lee ◽  
Md. Abu Hanif ◽  
Md. Akherul Islam ◽  
Jeasmin Akter ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Catalytic Performance ◽  
Calcination Time ◽  
Photocatalytic Ability ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Composite Photocatalysts ◽  
Cuo Nanocrystals ◽  
Walled Carbon Nanotubes

We report enhanced catalytic action of a series of copper(II)-oxide-single-walled carbon nanotube (CuO-SWCNT) composite photocatalysts (abbreviated as CuO-SWCNT-0.5, CuO-SWCNT-2, and CuO-SWCNT-5, where 0.5, 2, and 5 represent the calcination time in hours) synthesized via recrystallization followed by calcination. The photocatalytic performance of the fabricated nanocomposites was examined by evaluating the degradation of methylene blue (MB) under irradiation with visible light. All of the as-fabricated nanocomposites were effective photocatalysts for the photodegradation of a MB solution; however, the CuO-SWCNT-5 displayed the best photocatalytic ability among the investigated catalysts, achieving 97.33% degradation of MB in 2 h under visible-light irradiation. The photocatalytic action of the nanocomposites was remarkably higher than that of pristine CuO nanocrystals fabricated using the same route. The recyclability of the photocatalyst was also investigated; the CuO-SWCNT-5 catalyst could be reused for three cycles without substantial degradation of its catalytic performance or morphology.

scholarly journals In Situ Synthesis of a Stable Fe3O4@Cellulose Nanocomposite for Efficient Catalytic Degradation of Methylene Blue

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 275 ◽  
Author(s):  
Quan Lu ◽  
Yanjuan Zhang ◽  
Huayu Hu ◽  
Wen Wang ◽  
Zuqiang Huang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Fe3o4 Nanoparticles ◽  
Catalytic Performance ◽  
Catalytic Degradation ◽  
Precipitation Method ◽  
Regenerated Cellulose ◽  
Practical Applications ◽  
Fenton Catalyst ◽  
Co Precipitation

To rapidly obtain a stable Fe3O4@cellulose heterogeneous Fenton catalyst, a novel in situ chemical co-precipitation method was developed. Compared with mechanical activation (MA)-pretreated cellulose (MAC), MA + FeCl3 (MAFC)-pretreated cellulose (MAFCC) was more easily dissolved and uniformly distributed in NaOH/urea solvent. MAFCC and MAC solutions were used as precipitators to prepare Fe3O4@MAFCC and Fe3O4@MAC nanocomposites, respectively. MAFCC showed stronger interaction and more uniform combination with Fe3O4 nanoparticles than MAC, implying that MAFC pretreatment enhanced the accessibility, reactivity, and dissolving capacity of cellulose thus, provided reactive sites for the in situ growth of Fe3O4 nanoparticles on the regenerated cellulose. Additionally, the catalytic performance of Fe3O4@MAFCC nanocomposite was evaluated by using for catalytic degradation of methylene blue (MB), and Fe3O4@MAC nanocomposite and Fe3O4 nanoparticles were used for comparative studies. Fe3O4@MAFCC nanocomposite exhibited superior catalytic activity for the degradation and mineralization of MB in practical applications. After ten cycles, the structure of Fe3O4@MAFCC nanocomposite was not significantly changed owing to the strong interaction between MAFCC and Fe3O4 nanoparticles. This study provides a green pathway to the fabrication of a stable nanocomposite catalyst with high catalytic performance and reusability for the degradation of organic pollutants.

scholarly journals In situ synthesis of ZnO–GO/CGH composites for visible light photocatalytic degradation of methylene blue

RSC Advances ◽  
2019 ◽  
Vol 9 (70) ◽  
pp. 41209-41217 ◽  
Author(s):  
Xiaoxuan Di ◽  
Feng Guo ◽  
Zihan Zhu ◽  
Zhonghao Xu ◽  
Ziqi Qian ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
In Situ Synthesis ◽  
Synthesis Process ◽  
Light Illumination ◽  
Visible Light Illumination ◽  
Visible Light Photocatalytic

A novel ZnO–GO/CGH composite was prepared using an in situ synthesis process for photodegradation of methylene blue under visible light illumination.

scholarly journals Fabrication of Fe-doped ZnO/Nanocellulose Nanocomposite as an Efficient Photocatalyst for Degradation of Methylene Blue Under Visible Light

2022 ◽  
Author(s):  
Mohammad Saeed Vasheghani Farahani ◽  
Maryam Nikzad ◽  
Mohsen Ghorbani
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Chemical Precipitation ◽  
Degradation Efficiency ◽  
Hydroxyl Group ◽  
Precipitation Method ◽  
Molar Ratios ◽  
Doped Zno

Abstract In this work, a photocatalytic nanocomposite, Fe-doped ZnO/nanocellulose, was synthesized using an in-situ method and examined for methylene blue (MB) degradation. For this purpose, pure ZnO (PZ) was synthesized by the chemical precipitation method and then subjected to Fe+3 doping with different concentrations of Fe3+ (1, 3, and 5 mol%). The PZ and Fe-doped ZnO (FZ) samples were characterized using several standard analyses. UV-vis DRS analysis was also used to investigate the effect of Fe3+ doping on the bandgap of PZ. The doping of Fe3+ enhanced the photocatalytic activity of ZnO under visible light. The degradation efficiency of FZ samples (> 50%) was enhanced compared to the pristine ZnO (36.91%) during the same period. The catalyst with the highest degradation efficiency (94.21%) was then conjugated with broom corn stalk-derived nanocellulose (NC) at varying NC/ Zn2+ molar ratios (0.1, 0.2, 0.3, and 0.4) and characterized by various analyses. The NC enhanced the hydroxyl group at the surface of the nanocomposite, consequently improved the photocatalytic performance of the synthesized samples. The ability of the optimized photocatalyst for MB degradation was assessed. The effect of operating parameters such as pH, catalyst dosage, and initial MB concentration was investigated and degradation efficiency of 98.84% was achieved at the optimum condition. Besides, photocatalyst regeneration study indicated the great photocatalytic performance of this nanocomposite with no loss in its degradation efficiency. The facile synthesis and fast degradation rate of this nanocomposite make it a promising candidate for real-world wastewater treatment.

scholarly journals Highly Efficient Photocatalytic Cr(VI) Reduction by Lead Molybdate Wrapped with D-A Conjugated Polymer under Visible Light

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 106
Author(s):  
Ding Liu ◽  
Yin Wang ◽  
Xiao Xu ◽  
Yonggang Xiang ◽  
Zixin Yang ◽  
...  
Keyword(s):  
Visible Light ◽  
Conjugated Polymer ◽  
High Stability ◽  
Catalytic Performance ◽  
Toxic Heavy Metal ◽  
Heterojunction Structure ◽  
Lead Molybdate ◽  
Redox Capacity ◽  
Composite Photocatalysts

Well-designed composite photocatalysts are of increasing concern due to their enhanced catalytic performance compared to a single component. Here, a photocatalyst composed of PbMoO4 (PMO) and poly-benzothiadiazole (BBT, a D-A-conjugated polymer) was successfully synthesized by BBT polymerization on the surface of the PMO. The resultant BBT-PMO with a heterojunction structure represented an enhanced ability to reduce highly toxic heavy metal Cr(VI) from water under visible light irradiation. The 16.7% BBT-PMO(N, nanoscale) showed the best performance. The corresponding kobs over the 16.7% BBT-PMO(N) was 26-fold (or 53-fold) of that over the pure BBT (or pristine PMO(N)), and this activity was maintained after four cycles. The reasons for its good performance are discussed in detail based on the experimental results. Moreover, the synthesis of the BBT in situ of the PMO also altered the morphology of the BBT component, increasing the specific surface area of the BBT-PMO(N) and endowing it with the ability to adsorb Cr(VI). Additionally, the photocatalyst was also environmentally friendly as such a wrapped structure could sustain the high stability of the PMO without dissociation. This work provides a good strategy for efficient photocatalytic Cr(VI) reduction by designing an organic–inorganic hybrid system with high redox capacity.

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