scholarly journals Preparation of FeOOH/Cu with High Catalytic Activity for Degradation of Organic Dyes

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 338 ◽  
Author(s):  
Yingzhe Zhang ◽  
Junfeng Liu ◽  
Ding Chen ◽  
Qingdong Qin ◽  
Yujiao Wu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ball Milling ◽  
Rhodamine B ◽  
High Frequency ◽  
Organic Dyes ◽  
Raw Materials ◽  
High Catalytic Activity ◽  
Phenol Red ◽  
Cu Catalyst ◽  
High Frequency Electromagnetic Field

In this study, high-frequency electromagnetic-assisted ball-milling was used to prepare FeOOH/Cu catalyst. The combined effect of the high-frequency electromagnetic field and ball-milling resulted in the complete conversion of raw materials into FeOOH/Cu nanomagnetic hybrid at ~40 °C in only 30 h. Experiments showed that Rhodamine B was completely degraded within only 3 min, which was much faster than with previously reported catalysts. The combination effect of ball milling and microwave afforded excellent catalytic activity. Furthermore, the produced catalyst could be recovered easily using an external magnetic field for reuse. The influence of pH on the catalytic activity for degrading Rhodamine B, Phenol Red, Methyl Orange, and Methylene Blue were also investigated; Rhodamine B was completely degraded at pH 9 within only 2 min.

scholarly journals Formation of Cu2O Solid Solution via High-Frequency Electromagnetic Field-Assisted Ball Milling: The Reaction Mechanism

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 618 ◽  
Author(s):  
Yingzhe Zhang ◽  
Yudao Chen ◽  
Juan Li ◽  
Wei Li ◽  
Ding Chen ◽  
...  
Keyword(s):  
Solid Solution ◽  
Electromagnetic Field ◽  
Ball Milling ◽  
High Frequency ◽  
Environmental Water ◽  
Phenol Red ◽  
Degradation Of Dyes ◽  
Catalytically Active ◽  
High Frequency Electromagnetic Field ◽  
Aqueous Conditions

The contamination of environmental water with organic pollutants poses significant challenges for society, and much effort has been directed toward the development of catalysts and methods that can decompose these pollutants. While effort has been directed toward the fabrication of Cu2O catalysts by ball milling, this technique can involve long preparation times and provide low yields. In this study, we synthesized a solid solution of Cu2O in 22 h by high-frequency electric-field-assisted ball milling below 40 °C in only one step under aqueous conditions. We investigated the catalytic activities of the produced Cu2O solid solution in the microwave-assisted degradation of dyes, namely rhodamine B, phenol red and methyl orange. The prepared Cu2O solid solution was very catalytically active and completely degraded the above-mentioned dyes within 2 min. The one-dimensional diffusion model and the phase boundary (planar) model were found to describe the kinetics well. Synergism between ball milling and the high-frequency electromagnetic field plays a key role in the preparation of Cu2O solid solution nanoparticles. Ball milling facilitates the relaxation of the Cu2O lattice and high-frequency electromagnetic radiation accelerates the diffusion of Fe atoms into the Cu2O crystal along the (111) crystal plane, quickly leading to the formation of a Cu2O solid solution.

Surfactant-assisted synthesis of ceria–titania-rich mesoporous silica materials and their catalytic activity towards photodegradation of organic dyes

2017 ◽  
Vol 46 (29) ◽  
pp. 9577-9590 ◽  
Author(s):  
Nabanita Pal ◽  
Indrani Mukherjee ◽  
Sriparna Chatterjee ◽  
Eun-Bum Cho
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Visible Light ◽  
Rhodamine B ◽  
Organic Dyes ◽  
Pivotal Role ◽  
Silica Materials ◽  
Mesoporous Silica Materials ◽  
Surfactant Assisted

A series of Ce–Ti-doped mesoporous silica materials have been prepared under basic conditions. The materials played a pivotal role in visible-light-induced degradation of toxic Rhodamine B.

scholarly journals Biodiesel Production over Niobium-Containing Catalysts: A Review

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5506
Author(s):  
Daniel Carreira Batalha ◽  
Márcio José da Silva
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Heterogeneous Catalysts ◽  
Raw Materials ◽  
Catalytic Performance ◽  
High Specific Surface Area ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
Main Reaction ◽  
High Catalytic Activity

Nowadays, the synthesis of biofuels from renewable raw materials is very popular. Among the various challenges involved in improving these processes, environmentally benign catalysts compatible with an inexpensive feedstock have become more important. Herein, we report the recent advances achieved in the development of Niobium-containing heterogeneous catalysts as well as their use in routes to produce biodiesel. The efficiency of different Niobium catalysts in esterification and transesterification reactions of lipids and oleaginous raw materials was evaluated, considering the effect of main reaction parameters such as temperature, time, catalyst load, and oil:alcohol molar ratio on the biodiesel yield. The catalytic performance of Niobium compounds was discussed considering the characterization data obtained by different techniques, including NH3-TPD, BET, and Pyr-FT-IR analysis. The high catalytic activity is attributed to its inherent properties, such as the active sites distribution over a high specific surface area, strength of acidity, nature, amount of acidic sites, and inherent mesoporosity. On top of this, recycling experiments have proven that most Niobium catalysts are stable and can be repeatedly used with consistent catalytic activity.

A Core-Shell Nanoporous Pt-Cu Catalyst with Tunable Composition and High Catalytic Activity

2013 ◽  
Vol 23 (33) ◽  
pp. 4156-4162 ◽  
Author(s):  
Xingbo Ge ◽  
Luyang Chen ◽  
Jianli Kang ◽  
Takeshi Fujita ◽  
Akihiko Hirata ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Core Shell ◽  
High Catalytic Activity ◽  
Cu Catalyst

A Comparative Study of Photodegradation Behavior Sodium Niobate Nanowires and Microcubes

2020 ◽  
Vol 861 ◽  
pp. 221-227
Author(s):  
Chang Xu Yan ◽  
Bo Li ◽  
Jin Wang
Keyword(s):  
Catalytic Activity ◽  
Rhodamine B ◽  
Phase Structure ◽  
Photocatalytic Performance ◽  
Ferroelectric Phase ◽  
Organic Dyes ◽  
Sodium Niobate ◽  
Photo Catalytic Activity ◽  
First Order ◽  
Dyes Degradation

Sodium niobate catalysts with different morphologies of nanowires and microcubes have been prepared by hydrothermal method. The photocatalytic performance of NaNbO3 nanowires and microcubes was evaluated by degradation of rhodamine B (RhB) and cationic red X-GRL (CRX). The photodegradation reaction of organic dyes is shown to be kinetically first-order. The as-prepared NaNbO3 nanowires exhibit higher photo-catalytic activity for organic dyes degradation than NaNbO3 microcubes, which is attributed to the larger specific surface area and ferroelectric phase structure.

Aqueous synthesis of hierarchical bismuth nanobundles with high catalytic activity to organic dyes

2015 ◽  
Vol 83 ◽  
pp. 411-421 ◽  
Author(s):  
Dechong Ma ◽  
Yan Zhao ◽  
Jingzhe Zhao ◽  
Yawen Li ◽  
Yan Lu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Organic Dyes ◽  
High Catalytic Activity ◽  
Aqueous Synthesis
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