scholarly journals Preparation of Microporous Carbon from Sargassum horneri by Hydrothermal Carbonization and KOH Activation for CO2 Capture

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Ganning Zeng ◽  
Sa Lou ◽  
Huijuan Ying ◽  
Xi Wu ◽  
Xin Dou ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Carbon Material ◽  
High Performance ◽  
Hydrothermal Carbonization ◽  
High Specific Surface Area ◽  
Microporous Carbon ◽  
Sargassum Horneri ◽  
Koh Activation ◽  
Order Kinetic ◽  
Order Kinetic Model

High-performance microporous activated carbon (AHC) for CO2 capture was prepared from an emerging marine pollutant, Sargassum horneri, via hydrothermal carbonization (HTC) and KOH activation. The as-synthesized carbon material was characterized by N2 sorption-desorption measurement, TGA, SEM, XRD, FTIR, and elemental analysis. Impressively, the activated carbon exhibited high specific surface area (1221 m2/g), narrow distributed micropores (∼0.50 nm), and a relatively high nitrogen content (3.56 wt.%), which endowed this carbon material high CO2 uptake of 101.7 mg/g at 30°C and 1 bar. Moreover, the carbon material showed highly stable CO2 adsorption capacity and easy regeneration over four adsorption-desorption cycles. Two kinetic models were employed in this work and found that the pseudo-first-order kinetic model (R2 = 0.99) provided the best description. In addition, the high CO2 uptake is mainly attributed to the presence of abundant narrow microporous. The macroporous structure of hydrochar (HC) played an important role in the production of microporous carbon with high adsorption properties. This work provides an efficient strategy for preparing microporous activated carbon from Sargassum horneri, and AHC is a promising candidate acting as an efficient CO2 adsorbent for further industrial application.

scholarly journals Adsorption of Hexavalent Chromium from Aqueous Solution Using Chemically Activated Carbon Prepared from Locally Available Waste of Bamboo (Oxytenanthera abyssinica)

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Tamirat Dula ◽  
Khalid Siraj ◽  
Shimeles Addisu Kitte
Keyword(s):  
Activated Carbon ◽  
Hexavalent Chromium ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Batch Adsorption ◽  
Koh Activation ◽  
Order Kinetic ◽  
Oxytenanthera Abyssinica ◽  
Equilibrium Data ◽  
Order Kinetic Model

This study reports on the adsorption of Hexavalent Chromium from aqueous solutions using activated carbon prepared from bamboo (Oxytenanthera abyssinica) waste by KOH activation heating in an electrical furnace at 1073 K for 3 hrs. Batch adsorption experiments were also carried out as a function of pH, contact time, initial concentration of the adsorbate, adsorbent dosage, and temperature of the solution. Kinetic studies of the data showed that the adsorption follows the pseudo-second-order kinetic model. Thermodynamic parameters showed that adsorption on the surface of BWAC was feasible, spontaneous in nature, and exothermic between temperatures of 298 and 318 K. The equilibrium data better fitted the Freundlich isotherm model for studying the adsorption behavior of Hexavalent Chromium by BWAC. IR spectrum for loaded and unloaded BWAC was obtained using FT-IR spectrophotometer. Adsorption efficiency and capacity of Hexavalent Chromium were found to be 98.28% at pH 2 and 59.23 mg/g at 300 K.

Kinetic Studies and Adsorption Property of Activated Carbon from Heilongjiang Blended Coal for Phenol

2013 ◽  
Vol 803 ◽  
pp. 338-341
Author(s):  
Jing Jing Shao
Keyword(s):  
Activated Carbon ◽  
Adsorption Property ◽  
Kinetic Studies ◽  
Second Order ◽  
Koh Activation ◽  
Order Kinetic ◽  
Blended Coal ◽  
Coal Blending ◽  
Order Kinetic Model ◽  
Solution Kinetic

HSAAC was prepared from coal blending test of Qitaihe Coal and Yilan Coal with KOH activation method under N2 protection, to study its adsorption property for phenol in aqueous solution. Kinetic studies showed that adsorption of activated carbon for phenol fitted the second order kinetic model. The second order rate constants k2 is 1.9515×10-2 g•mg-1•min-1.

scholarly journals Optimized production, Pb(II) adsorption and characterization of alkali modified hydrochar from sugarcane bagasse

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mohamad Ebrahim Malool ◽  
Mostafa Keshavarz Moraveji ◽  
Jalal Shayegan
Keyword(s):  
Sugarcane Bagasse ◽  
Hydrothermal Carbonization ◽  
Biodiesel Production ◽  
Batch Adsorption ◽  
Koh Activation ◽  
Order Kinetic ◽  
Mixing Ratios ◽  
Order Kinetic Model ◽  
Physicochemical Features ◽  
Langmuir Isotherm Model

AbstractToday, sugarcane bagasse (SB) is used for bioethanol and biodiesel production, energy generation, and adsorbent synthesis. The goal of this project is to determine the optimized conditions for producing adsorbent from sugarcane bagasse using hydrothermal carbonization (HTC) and KOH activation. To optimize process parameters such as reaction temperature, residence time, ZnCl2/SB mixing ratios, and water/SB mixing ratios, response surface methodology was used. The results revealed that the optimum modified adsorption occurred at 180 °C, 11.5 h, a water to biomass ratio of (5:1), and a ZnCl2 to precursor ratio of (3.5:1). The physicochemical features of optimum activated hydrochar were investigated, as well as batch adsorption experiments. The pseudo-second-order kinetic model and the Langmuir isotherm model were found to fit the experimental results in batch adsorption studies [$${q}_{max}=90.1$$ q max = 90.1 (mg/g)]. Thermodynamic experiments further confirmed the spontaneous and exothermic adsorption mechanism.

Simultaneous removal of cationic methylene blue and anionic reactive red 198 dyes using magnetic activated carbon nanoparticles: equilibrium, and kinetics analysis

2018 ◽  
Vol 2017 (2) ◽  
pp. 534-545 ◽  
Author(s):  
Samer Abuzerr ◽  
Maher Darwish ◽  
Amir Hossein Mahvi
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
High Performance ◽  
Order Kinetic ◽  
Anionic Dyes ◽  
Solution Ph ◽  
Magnetic Activated Carbon ◽  
Reactive Red 198 ◽  
Equilibrium And Kinetics ◽  
Order Kinetic Model

Abstract For the simultaneous adsorption of cationic dye (methylene blue, MB) and anionic dye (reactive red 198, RR198) from aqueous solution, magnetic activated carbon (MAC) nanocomposite as a promising adsorbent was prepared and used. The concentration of MB at different time intervals was determined using a UV-Vis spectrophotometer while the concentration of RR198 was determined using a high performance liquid chromatography (HPLC) system. The effect of solution pH, contact time, adsorbent amount, and dye concentration were investigated. Also, both kinetic and isotherm experiments were studied. The optimum pH was 10 and 5.5 for adsorption of MB and RR198, respectively, and the equilibrium status was achieved after 120 min. The adsorption kinetics was controlled by the pseudo-second order kinetic model more than pseudo-first order. The best-fitted isotherms were Freundlich and Langmuir models for MB and RR198, respectively. The higher values of Freundlich adsorption capacity (Kf) for MB in comparison with RR198 refer to MAC affinity to remove cationic dyes more than anionic dyes. Apparently, there was no substantial change in the adsorption efficiency among the 10 adsorption–desorption cycles. Overall, MAC can be considered as an effective and efficient viable adsorbent for cationic and anionic dyes removal from industrial wastewaters.

Adsorption of Chromium (VI) from Aqueous Solution by Agricultural Waste Derived Activated Carbon

2013 ◽  
Vol 726-731 ◽  
pp. 2100-2106 ◽  
Author(s):  
Hua Zhang ◽  
Xue Hong Zhang ◽  
Yi Nian Zhu ◽  
Shou Rui Yuan
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Agricultural Waste ◽  
Order Kinetic ◽  
Chromium Vi ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Grapefruit Peel ◽  
Pseudo Second Order ◽  
C 30

Activated carbon prepared from grapefruit peel, an agricultural solid waste by-product, has been used for the adsorption of Cr(VI) from aqueous solution. The effects of adsorbent dosage, pH and temperature on adsorption of Cr(VI) were investigated. The maximum adsorption yield was obtained at the initial pH of 3. The dynamical data fit very well with the pseudo-second-order kinetic model and the calculated adsorption capacities (23.98, 24.33 and 24.81 mg/g) were in good agreement with experiment results at 20°C, 30°C and 40 °C for the 100 mg/L Cr(VI) solution. The Freundlich model (R2 values were 0.9198-0.9871) fitted adsorption data better than the Langmuir model. The calculated parameters confirmed the favorable adsorption of Cr(VI) on the activated carbon prepared from grapefruit peel.

Analysis of the Factors Affecting the Instrumentation of the Technological Process of the Activated Carbon Material Production

2022 ◽  
pp. 20-30
Author(s):  
A.A. Popova ◽  
I.N. Shubin
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Carbon Material ◽  
Mutual Influence ◽  
Chemical Activation ◽  
High Specific Surface Area ◽  
Laboratory Research ◽  
High Porosity ◽  
Gas Purification ◽  
Factors Affecting

The article discusses significance of the development of activated carbon materials with a high specific surface area and high porosity. The features of the course of chemical activation and the factors influencing the characteristics of the obtained material have been established. The main stages of the activation of the carbon material, including the preliminary raw carbon material carbonization, its alkaline activation, and the post-processing of the created material, have been determined. The mutual influence of temperature and flow rate of an inert gas on the characteristics of a carbon material obtained with a BET specific surface in the range of 2550–2700 m2/g is experimentally investigated. The analysis of the obtained results has been carried out. Recommendations are given for reducing ambiguity and uncertainty during the transition from laboratory research to pilot production. The resulting activated carbon material can be used as a sorbent in gas purification systems, gas accumulators and for solving various environmental problems.

scholarly journals Adsorption of Cr(VI) ions onto goethite, activated carbon and their composite: kinetic and thermodynamic studies

2020 ◽  
Vol 10 (9) ◽  
Author(s):  
G. B. Adebayo ◽  
H. I. Adegoke ◽  
Sidiq Fauzeeyat
Keyword(s):  
Activated Carbon ◽  
Heavy Metal Contamination ◽  
Stem Bark ◽  
Order Kinetic ◽  
Adsorption Capacities ◽  
Optimum Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Daniellia Oliveri ◽  
Kinetic And Thermodynamic Studies

Abstract Hexavalent chromium was adsorbed from aqueous solution with three prepared and characterized adsorbents, namely goethite (G), activated carbon (AC) and their composite (GAC). The goethite particle was synthesized using the precipitation methods, and activated carbon was prepared from the stem bark of Daniellia oliveri tree and composite in a ratio of 1:5 goethite–activated carbon. The adsorption capacities of G, AC and GAC for Cr(VI) are 6.627, 5.455 and 6.354 mg/g with 0.02 g adsorbent within contact time of 60, 180 and 30 min for G, AC and GAC, respectively, for Cr(VI) adsorption at optimum pH of 3. The isotherm studied was best explained by Langmuir adsorption isotherm and fitted with the pseudo-second-order kinetic model. Desorption studies showed that 1.0 M HNO3 was a better desorbing agent than 0.1 M HNO3, 0.1 M HCl and 1.0 M HCl. Chromium was most desorbed (94.60% in Cr//G using 1 M HNO3). The result obtained revealed that goethite and activated carbon produced are favourable adsorbents and the composite of the two adsorbents gives a more favourable, economical and affordable adsorbent for the clean-up of heavy metal contamination.

scholarly journals Preparation and Characterization of Nanoporous Activated Carbon Derived from Prawn Shell and Its Application for Removal of Heavy Metal Ions

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 241 ◽  
Author(s):  
Jian Guo ◽  
Yaqin Song ◽  
Xiaoyang Ji ◽  
Lili Ji ◽  
Lu Cai ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Activated Carbon ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Ph Value ◽  
Average Pore Size ◽  
High Specific Surface Area ◽  
Koh Activation ◽  
Average Pore ◽  
Effects Of Ph

The aim of this study was to optimize the adsorption performance of activated carbon (AC), derived from the shell of Penaeus vannamei prawns, on heavy metal ions. Inexpensive, non-toxic, and renewable prawn shells were subjected to carbonization and, subsequently, KOH-activation to produce nanoporous K-Ac. Carbonized prawn shells (CPS) and nanoporous KOH-activated carbon (K-Ac) from prawn shells were prepared and characterized by FTIR, XRD, BET, SEM, and TEM. The results showed that as-produced K-Ac samples were a porous material with microporous and mesoporous structures and had a high specific surface area of 3160 m2/g, average pore size of about 10 nm, and large pore volume of 2.38 m3/g. Furthermore, batches of K-Ac samples were employed for testing the adsorption behavior of Cd2+ in solution. The effects of pH value, initial concentration, and adsorption time on Cd2+ were systematically investigated. Kinetics and isotherm model analysis of the adsorption of Cd2+ on K-Ac showed that experimental data were not only consistent with the Langmuir adsorption isotherm, but also well-described by the quasi-first-order model. Finally, the adsorption behaviors of as-prepared K-Ac were also tested in a ternary mixture of heavy metal ions Cu2+, Cr6+, and Cd2+, and the total adsorption amount of 560 mg/g was obtained.

Preparation of high specific surface area and high adsorptive activated carbon by KOH activation

2019 ◽  
Vol 199 (1) ◽  
pp. 22-29 ◽  
Author(s):  
Wang-Quan Zhang ◽  
Xin Sui ◽  
Bing Yu ◽  
You-Qing Shen ◽  
Hai-Lin Cong
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
Koh Activation

scholarly journals “Water-in-salt” electrolyte enhanced high voltage aqueous supercapacitor with carbon electrodes derived from biomass waste-ground grain hulls

RSC Advances ◽  
2020 ◽  
Vol 10 (58) ◽  
pp. 35545-35556
Author(s):  
Mingjun Pang ◽  
Shang Jiang ◽  
Jianguo Zhao ◽  
Sufang Zhang ◽  
Runwei Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
High Voltage ◽  
High Specific Surface Area ◽  
Carbon Electrodes ◽  
Koh Activation ◽  
Biomass Waste

To design high specific surface area and optimize the pore size distribution of materials, we employ a combination of carbonization and KOH activation to prepare activated carbon derived from ground grain hulls.

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