scholarly journals Awn Stem-Derived High-Activity Free-Metal Porous Carbon for Oxidation Reduction

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 6071
Author(s):  
Qingyun Zhao ◽  
Shikai Wen ◽  
Junhua Hou
Keyword(s):  
High Activity ◽  
Active Sites ◽  
Low Cost ◽  
Value Added ◽  
Reduction Reaction ◽  
Active Centers ◽  
Oxidation Reduction ◽  
Pyridine Nitrogen ◽  
Free Metal ◽  
Value Added Products

Designing oxygen reduction reaction (ORR) catalysts with excellent performance has far-reaching significance. In this work, a high-activity biomass free-metal carbon catalyst with N and S co-doped was successfully prepared by using the KOH activated awn stem powder as the precursor with organic matter pore-forming doping technology, which is named TAAS. The content of pyridine nitrogen groups accounts for up to 36% of the total nitrogen content, and a rich pore structure is formed on the surface and inside, which are considered as the potential active centers of ORR. The results show that the specific surface area of TAAS reaches 191.04 m2/g, which effectively increases the active sites of the catalyst, and the initial potential and half slope potential are as high as 0.90 and 0.76 V vs. RHE, respectively. This study provides a low-cost, environmentally friendly and feasible strategy for the conversion of low-value agricultural and forestry wastes into high value-added products to promote sustainable development of energy and the environment.

Tailoring the Co4+/Co3+ active sites in single perovskite as a bifunctional catalyst for oxygen electrode reactions "

2021 ◽  
Author(s):  
Song-Jeng Isaac Huang ◽  
Adil Muneeb ◽  
Sabhapathy Palani ◽  
Anjaiah Sheelam ◽  
Bayikadi Khasimsaheb ◽  
...  
Keyword(s):  
Oxygen Evolution Reaction ◽  
Precious Metal ◽  
Active Sites ◽  
Low Cost ◽  
Bifunctional Catalyst ◽  
Oxygen Electrode ◽  
Reduction Reaction ◽  
New Class ◽  
Electrode Reactions ◽  
Energy Conversion Devices

Developing a non-precious metal electrocatalyst for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is desirable for low-cost energy conversion devices. Herein, we designed and developed a new class...

scholarly journals Production of Bacterial Cellulose by Acetobacter tropicalis Isolated from Decaying Apple Waste

2022 ◽  
Vol 34 (2) ◽  
pp. 453-458
Author(s):  
Lakhvinder Kaur ◽  
Shachi Shah
Keyword(s):  
Bacterial Cellulose ◽  
Organic Waste ◽  
Fruits And Vegetables ◽  
Low Cost ◽  
Value Added ◽  
Bacterial Isolates ◽  
Research Areas ◽  
Wide Range ◽  
Potential Alternative ◽  
Value Added Products

Fruits and vegetables have the highest wastage rates of 45% of any food. One of the recent research areas is food waste valorization as a potential alternative to the disposal of a wide range of organic waste using microorganisms as one of the strategies known as microbial valorization. Bacterial cellulose is best known microbial valorization product because of its low cost, environmentally friendly nature, renewability, nanoscale dimensions, biocompatibility and extremely high hydrophilicity. Therefore, present study focuses on the isolation, characterization and identification of cellulose producing bacteria from decaying apple waste. Cellulose producers were isolated from decaying apple waste. The bacterial isolates obtained were identified through the morphological biochemical, physiological and molecular identification. The bacterial isolates exhibited potential remediation options to biovalorize decaying fruit waste by producing value added products as well as in safe disposal of waste.

scholarly journals Highly Active Carbon-Based Electrocatalysts for Dye-Sensitized Solar Cells: A Brief Review

Physics ◽  
2020 ◽  
Vol 2 (3) ◽  
pp. 412-424
Author(s):  
Chi-Ang Tseng ◽  
Chuan-Pei Lee
Keyword(s):  
Catalytic Activity ◽  
Solar Cells ◽  
Active Sites ◽  
Low Cost ◽  
Dye Sensitized Solar Cells ◽  
Reduction Reaction ◽  
Dye Sensitized ◽  
Highly Active ◽  
Sensitized Solar Cells ◽  
Carbon Based

Dye-sensitized solar cells (DSSCs) have emerged as promising alternatives to traditional silicon-based solar cells due to their relatively high conversion efficiency, low cost, flexibility, and environmentally benign fabrication processes. In DSSCs, platinum (Pt)-based materials used as the counter electrode (CE) exhibit the superior catalytic ability toward the reduction reaction of triiodide ions, which are attributed to their excellent catalytic activity and high electrical conductivity. However, Pt-based materials with high cost and limited supply hinder them from mass production. Developing highly active and stable CE materials without noble metals has been a persistent challenge for the practical application in DSSCs. Recently, a number of earth-abundant catalysts, especially carbon-based materials, display high activity, low cost, and good stability that render them attractive candidates to replace Pt in DSSCs. Herein, we will briefly review recent progress on carbon-based electrocatalysts as CEs in DSSC applications. The strategies of improving the catalytic activity of carbon-based materials such as structural engineering and/or heteroatom doping will be introduced. The active sites toward the reduction reaction of triiodide ions summarized from experimental results or theoretical calculation will also be discussed. Finally, the futuristic prospects and challenges of carbon-based electrocatalysts as CEs in DSSCs will be briefly mentioned.

scholarly journals Calcium Hydroxyapatite-Based Marine Origin: Novel Sunscreen Materials for Cosmeceutical Treatments

2018 ◽  
Vol 34 (6) ◽  
pp. 2770-2776
Author(s):  
Mohd Zul Helmi Rozaini ◽  
Habibah Hamzah ◽  
Chia Poh Wai ◽  
Mohd Hasmizam Razali ◽  
Uwaisulqarni M. Osman ◽  
...  
Keyword(s):  
Uv Light ◽  
Low Cost ◽  
Value Added ◽  
Dry Weight ◽  
Calcium Hydroxyapatite ◽  
The Novel ◽  
X Ray Diffraction ◽  
Light Absorber ◽  
Mn Doped ◽  
Value Added Products

Fringescalesardinella or TambanSisik bones have been discovered can be utilized as sunscreen agent in cosmeceuticals. Its flesh is the main ingredient in keropoklekor or fish crackers in Malaysia and the bones contained very high hydroxyapatite (HAp), (Ca10(PO4)6(OH)2) compound which exhibit as UV light absorber. The percentage yields obtained from the hydrothermal extraction consist of 41.2 ± 0.66 % (w/w) of HApwhich was almost half of the dry weight of 100 g samples.The additional of manganeseand ferum,initiated the novel sunscreen materials from hydroxyapatite-Fe and hydroxyapatite-Mn doped (modified bones). The unmodified HAp recorded with SPF 20 and modified HAp-Mn measured with SPF 40. Modified HAp-Fe emulsions were recorded with SPF 50 as the highest SPF value. Therefore, the bones have been characterized using Fourier Transform Infrared Radiation (FTIR)spectroscopy and x-Ray diffraction (XRD).The results obtained clearly indicated that the HAp existence in waste of Fringescalesardinella bones with addition of FeCl2which exhibits high potential as sunscreen compared to manganese and unmodified bones. Thus, the utilization of waste from the fish bones not only produce value-added products from low-cost resources, but also help in reducing pollution to the environment and preserved the global sustainability.

scholarly journals Fish Waste-Potential Low Cost Substrate for Bacterial Protease Production: A Brief Review

2016 ◽  
Vol 10 (1) ◽  
pp. 335-341 ◽  
Author(s):  
Aishwarya Ramkumar ◽  
Nallusamy Sivakumar ◽  
Reginald Victor
Keyword(s):  
Low Cost ◽  
Value Added ◽  
Protease Production ◽  
Industrial Biotechnology ◽  
Fish Waste ◽  
Environment And Health ◽  
Protease Enzyme ◽  
The Rich ◽  
The Cost ◽  
Value Added Products

Industrial biotechnology processes have recently been exploited for an economic utilization of wastes to produce value added products. Of which, fish waste is one of the rich sources of proteins that can be utilized as low cost substrates for microbial enzyme production. Fish heads, tails, fins, viscera and the chitinous materials make up the wastes from fish industries. Processing these wastes for the production of commercial value added products could result in a decrease in the cost of production. In addition, we can eliminate the pollution of the environment and health issues due to the improper disposal of these fish wastes. This review highlights the potential use of fish waste as a cheaper substrate for the production of economically important protease enzyme.

Dexterous Creation of Soccer-Ball Pattern by Using Urethane Rubber

2016 ◽  
Vol 10 (2) ◽  
pp. 239-243 ◽  
Author(s):  
Kosuke Funatani ◽  
◽  
Keiichi Nakamoto ◽  
Anthony Beaucamp ◽  
Yoshimi Takeuchi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Production Technology ◽  
Sodium Acetate ◽  
Low Cost ◽  
Value Added ◽  
Soft Materials ◽  
High Quality ◽  
Soccer Ball ◽  
Soft Objects ◽  
Value Added Products

It is important to establish new approaches to create value-added products, such as craftwork or artistic goods, that are different from traditional methods of realizing high-quality and low-cost products. Such a production technology is commonly called “dexterous machining.” This study addresses the creation of artistic products by using soft materials with complicated shapes by employing an aqueous solution of sodium acetate to fix a workpiece and to suppress the deformation. Experimental results show that the use of an aqueous solution of sodium acetate has the potential to realize the “dexterous machining” of soft objects.

Nitrogen(N)-doped activated carbon materials with a narrow pore size distribution derived from coal liquefaction residues as low-cost and high-activity oxygen reduction catalysts in alkaline solution

RSC Advances ◽  
2016 ◽  
Vol 6 (93) ◽  
pp. 90076-90081 ◽  
Author(s):  
Lei Zhao ◽  
Yanchao Wang ◽  
Weibin Li
Keyword(s):  
Activated Carbon ◽  
Oxygen Reduction ◽  
High Activity ◽  
Low Cost ◽  
Reduction Reaction ◽  
Coal Liquefaction ◽  
Narrow Pore Size Distribution ◽  
Oxygen Reduction Catalysts ◽  
Reduction Catalysts ◽  
Oxygen Reduction Reaction Catalyst

Coal liquefaction residues with a high content of nitrogen were used to prepare N-doped activated carbon as low-cost and high-activity oxygen reduction reaction catalyst.

scholarly journals Systems biology and metabolic engineering of Rhodococcus for bioconversion and biosynthesis processes

2021 ◽  
Author(s):  
Eva Donini ◽  
Andrea Firrincieli ◽  
Martina Cappelletti
Keyword(s):  
Renewable Resources ◽  
Rational Design ◽  
Low Cost ◽  
Value Added ◽  
Adaptive Laboratory Evolution ◽  
Toxic Compounds ◽  
Laboratory Evolution ◽  
Metabolic Versatility ◽  
Genomic Basis ◽  
Value Added Products

AbstractRhodococcus spp. strains are widespread in diverse natural and anthropized environments thanks to their high metabolic versatility, biodegradation activities, and unique adaptation capacities to several stress conditions such as the presence of toxic compounds and environmental fluctuations. Additionally, the capability of Rhodococcus spp. strains to produce high value-added products has received considerable attention, mostly in relation to lipid accumulation. In relation with this, several works carried out omic studies and genome comparative analyses to investigate the genetic and genomic basis of these anabolic capacities, frequently in association with the bioconversion of renewable resources and low-cost substrates into triacylglycerols. This review is focused on these omic analyses and the genetic and metabolic approaches used to improve the biosynthetic and bioconversion performance of Rhodococcus. In particular, this review summarizes the works that applied heterologous expression of specific genes and adaptive laboratory evolution approaches to manipulate anabolic performance. Furthermore, recent molecular toolkits for targeted genome editing as well as genome-based metabolic models are described here as novel and promising strategies for genome-scaled rational design of Rhodococcus cells for efficient biosynthetic processes application.

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