Preparation and characterization of super activated carbon produced from gulfweed by KOH activation
TL;DR: In this paper, gulfweed was used as a precursor material for the preparation of super activated carbon (SAC) by chemical activation method with KOH, and an L16 (43) (four three-level factors) orthogonal design table was established, and the influences of the activation temperature, the activation time and the impregnation ratio on the pore structure were explored.
About: This article is published in Microporous and Mesoporous Materials.The article was published on 2017-05-01. It has received 212 citations till now. The article focuses on the topics: Specific surface area.
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TL;DR: The results suggest that this garlic skin-derived 3D hierarchical porous carbon is a promising electrode material for high-performance supercapacitors.
Abstract: A three-dimensional hierarchical porous carbon is synthesized via a facile chemical activation route with garlic skin as the precursor and KOH as the activating agent. The as-obtained carbon presents a high specific surface area of 2818 m2 g−1 and a hierarchical porous architecture containing macroporous frameworks, mesopores (2–4 nm), and micropores (0.6–1.0 nm). As the electrode material for a supercapacitor, due to its unique interconnected porous structure, this garlic skin-derived carbon exhibits excellent electrochemical performance and cycling stability. At a current density of 0.5 A g−1, the capacitance is up to 427 F g−1 (162 F cm−3). Even at a high current density of 50 A g−1, the capacitance can be maintained to a high value of 315 F g−1 (120 F cm−3). After charging–discharging at a current density of 4.5 A g−1 for 5000 cycles, the capacitance retention is as high as 94%. The results suggest that this garlic skin-derived 3D hierarchical porous carbon is a promising electrode material for high-performance supercapacitors.
331 citations
TL;DR: The objective of this study is to reveal and distinguish the individual roles of different activating agents during AC synthesis, highlighting the development of activating agent roles during the process of AC.
186 citations
10 Aug 2020
TL;DR: The use of a combination of a magnetic material and an activated carbon material for dye adsorption in wastewater treatment is described, which can provide an economical, efficient, and environmentally friendly water-purification process.
Abstract: Since the turn of the 21st century, water pollution has been a major issue, and most of the pollution is generated by dyes. Adsorption is one of the most commonly used dye-removal methods from aqueous solution. Magnetic-particle integration in the water-treatment industry is gaining considerable attention because of its outstanding physical and chemical properties. Magnetic-particle adsorption technology shows promising and effective outcomes for wastewater treatment owing to the presence of magnetic material in the adsorbents that can facilitate separation through the application of an external magnetic field. Meanwhile, the introduction of activated carbon (AC) derived from various materials into a magnetic material can lead to efficient organic-dye removal. Therefore, this combination can provide an economical, efficient, and environmentally friendly water-purification process. Although activated carbon from low-cost and abundant materials has considerable potential in the water-treatment industry, the widespread applications of adsorption technology are limited by adsorbent recovery and separation after treatment. This work specifically and comprehensively describes the use of a combination of a magnetic material and an activated carbon material for dye adsorption in wastewater treatment. The literature survey in this mini-review provides evidence of the potential use of these magnetic adsorbents, as well as their magnetic separation and recovery. Future directions and challenges of magnetic activated carbon in wastewater treatment are also discussed in this paper.
169 citations
TL;DR: In this article, a review of microwave absorption properties of various BPC-based MAMs is provided, where the performance of pure BPC served as microwave absorber and the strategies to improve the microwave absorption of BPC including heteroatom doping and the formation of composites with magnetic metals, metal oxides, polymers, and so on, are discussed.
Abstract: With the pursuit of high-efficiency microwave absorbing materials (MAMs), biomass derived porous carbon (BPC)-based materials have attracted a great deal of attentions due to their plentiful resources, low density and highly environment-friendly. The microwave absorption of BPC composites is closely correlated to their composition, surface chemical activity, microstructures, and pore size, which are in turn decisively determined by the biomass precursors and subsequent carbonization or activation. In this article, we provide a timely and comprehensive review on recent achievements for the microwave absorption properties of various BPC-based MAMs. Firstly, the general synthesizing approaches for carbon materials from various biomass sources, especially in relation to the carbonization and activation are summarized. Then, based on the basic microwave absorption theory, the performances of pure BPC served as microwave absorber are presented. After that, the strategies to improve the microwave absorption properties of BPC including heteroatom doping and the formation of composites with magnetic metals, metal oxides, polymers, and so on, are discussed as well. Finally, we provide discussions and prospects for the development of BPC as lightweight and efficient MAMs in the further. It is believed that the current progress in experimental investigations combined with theoretical predictions will greatly promote the design and development of lightweight and efficient MAMs. Moreover, as an important type of MAMs, views on the challenges and prospects of BPC-based MAMs are proposed as well.
160 citations
TL;DR: The SAC and the regenerated SAC after five adsorption-regeneration cycles (RSAC-5th) were fully characterized by several techniques and showed that the SAC surface is composed by oxygen containing-groups, whilst the RSAC- 5th also presents nitrogen ones, provenient from the PCT molecules.
150 citations
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TL;DR: In this article, the drying process, the atmosphere during the carbonisation, the chemical state of the activating agents (NaOH, KOH and Na 2 CO 3 ) and the chemical reactions occurring during the heat treatment have been analyzed to deep into the fundamental of the knowledge of this chemical activation process.
989 citations
TL;DR: In this paper, the effects of activation temperature and impregnation ratio on the pore structure and surface chemistry of activated carbons derived from jackfruit peel with chemical activation method using phosphoric acid as activating agent were studied.
704 citations
TL;DR: In this article, a discussion is presented on the possible mechanisms of phosphoric acid activation, drawing upon extensive research on the use of phosphorous compounds as fire retardants for wood and cellulose, and it is considered that activation of amorphous polymers produces mostly micropores, while activation of crystalline cellulose produces a mixture of pore sizes.
568 citations
TL;DR: In this article, the preparation of activated carbon from two different types of agricultural biomass materials, sugar cane bagasse and sunflower seed hull, by phosphoric acid and zinc chloride activation was reported.
418 citations
TL;DR: In this paper, the synthesis of activated carbon (AC) obtained by KOH chemical activation of spherical carbon (SC) produced from hydrothermal treatment (HT) of sucrose was reported.
416 citations