Preparation of activated carbon from unburned carbon in biomass fly ash and its supercapacitor performance

Background: The fly ash produced by coal-fired power plants is an industrial waste. The environmental pollution problems caused by fly ash have been widely of public environmental concern. As a waste of recoverable resources, it can be used in the field of building materials, agricultural fertilizers, environmental materials, new materials, etc. Unburned carbon content in fly ash has an influence on the performance of resource reuse products. Therefore, it is the key to remove unburned carbon from fly ash. As a physical method, triboelectrostatic separation technology has been widely used because of obvious advantages, such as high-efficiency, simple process, high reliability, without water resources consumption and secondary pollution. Objective: The related patents of fly ash triboelectrostatic separation had been reviewed. The structural characteristics and working principle of these patents are analyzed in detail. The results can provide some meaningful references for the improvement of separation efficiency and optimal design. Methods: Based on the comparative analysis for the latest patents related to fly ash triboelectrostatic separation, the future development is presented. Results: The patents focused on the charging efficiency and separation efficiency. Studies show that remarkable improvements have been achieved for the fly ash triboelectrostatic separation. Some patents have been used in industrial production. Conclusion: According to the current technology status, the researches related to process optimization and anti-interference ability will be beneficial to overcome the influence of operating conditions and complex environment, and meet system security requirements. The intelligent control can not only ensure the process continuity and stability, but also realize the efficient operation and management automatically. Meanwhile, the researchers should pay more attention to the resource utilization of fly ash processed by triboelectrostatic separation.

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Coagulation Efficiency of Biomass Fly Ash Leachate in Thermomechanical Pulping (TMP) Pressate

Waste and Biomass Valorization ◽

10.1007/s12649-020-01335-4 ◽

2021 ◽

Author(s):

Germain Cave ◽

Weijue Gao ◽

Pedram Fatehi

Keyword(s):

Fly Ash ◽

Thermomechanical Pulping ◽

Biomass Fly Ash

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In Situ Fabrication of Activated Carbon from a Bio-Waste Desmostachya bipinnata for the Improved Supercapacitor Performance

Nanoscale Research Letters ◽

10.1186/s11671-021-03545-8 ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Gopal Krishna Gupta ◽

Pinky Sagar ◽

Sumit Kumar Pandey ◽

Monika Srivastava ◽

A. K. Singh ◽

...

Keyword(s):

Activated Carbon ◽

Energy Density ◽

Power Density ◽

Supercapacitor Electrode ◽

In Situ Fabrication ◽

Transmission Electron ◽

Good Energy ◽

Supercapacitor Performance ◽

Operating Potential

AbstractHerein, we demonstrate the fabrication of highly capacitive activated carbon (AC) using a bio-waste Kusha grass (Desmostachya bipinnata), by employing a chemical process followed by activation through KOH. The as-synthesized few-layered activated carbon has been confirmed through X-ray powder diffraction, transmission electron microscopy, and Raman spectroscopy techniques. The chemical environment of the as-prepared sample has been accessed through FTIR and UV–visible spectroscopy. The surface area and porosity of the as-synthesized material have been accessed through the Brunauer–Emmett–Teller method. All the electrochemical measurements have been performed through cyclic voltammetry and galvanometric charging/discharging (GCD) method, but primarily, we focus on GCD due to the accuracy of the technique. Moreover, the as-synthesized AC material shows a maximum specific capacitance as 218 F g−1 in the potential window ranging from − 0.35 to + 0.45 V. Also, the AC exhibits an excellent energy density of ~ 19.3 Wh kg−1 and power density of ~ 277.92 W kg−1, respectively, in the same operating potential window. It has also shown very good capacitance retention capability even after 5000th cycles. The fabricated supercapacitor shows a good energy density and power density, respectively, and good retention in capacitance at remarkably higher charging/discharging rates with excellent cycling stability. Henceforth, bio-waste Kusha grass-derived activated carbon (DP-AC) shows good promise and can be applied in supercapacitor applications due to its outstanding electrochemical properties. Herein, we envision that our results illustrate a simple and innovative approach to synthesize a bio-waste Kusha grass-derived activated carbon (DP-AC) as an emerging supercapacitor electrode material and widen its practical application in electrochemical energy storage fields.

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Preparation and characterization of andisol-zeolite-fly ash-activated carbon (AZFC) as potential adsorbent for metal ion removal

10.1063/5.0032586 ◽

2020 ◽

Author(s):

Antonius Agus Bambang Haryanto ◽

Ari Handono Ramelan ◽

MTh Sri Budiastuti ◽

Pranoto

Keyword(s):

Activated Carbon ◽

Fly Ash ◽

Metal Ion ◽

Metal Ion Removal ◽

Ion Removal

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Zeolites‐containing geopolymers obtained from biomass fly ash: Influence of temperature, composition, and porosity

Journal of the American Ceramic Society ◽

10.1111/jace.17512 ◽

2020 ◽

Vol 104 (2) ◽

pp. 803-815

Author(s):

Lisandro Simão ◽

Andreia De Rossi ◽

Dachamir Hotza ◽

Manuel J. Ribeiro ◽

Rui M. Novais ◽

...

Keyword(s):

Fly Ash ◽

Influence Of Temperature ◽

Biomass Fly Ash

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The Influence of Cement Substitution by Biomass Fly Ash on the Polymer–Cement Composites Properties

Materials ◽

10.3390/ma14113079 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3079

Author(s):

Beata Jaworska ◽

Dominika Stańczak ◽

Joanna Tarańska ◽

Jerzy Jaworski

Keyword(s):

Fly Ash ◽

Building Materials ◽

Raw Materials ◽

Combustion Process ◽

Biomass Combustion ◽

Cement Composites ◽

Cement Mortars ◽

Mineral Additive ◽

Biomass Fly Ash

The generation of energy for the needs of the population is currently a problem. In consideration of that, the biomass combustion process has started to be implemented as a new source of energy. The dynamic increase in the use of biomass for energy generation also resulted in the formation of waste in the form of fly ash. This paper presents an efficient way to manage this troublesome material in the polymer–cement composites (PCC), which have investigated to a lesser extent. The research outlined in this article consists of the characterization of biomass fly ash (BFA) as well as PCC containing this waste. The characteristics of PCC with BFA after 3, 7, 14, and 28 days of curing were analyzed. Our main findings are that biomass fly ash is suitable as a mineral additive in polymer–cement composites. The most interesting result is that the addition of biomass fly ash did not affect the rheological properties of the polymer–cement mortars, but it especially influenced its compressive strength. Most importantly, our findings can help prevent this byproduct from being placed in landfills, prevent the mining of new raw materials, and promote the manufacture of durable building materials.

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