scholarly journals Adsorption of Reactive Blue 19 on coconut shell and bamboo activated carbons

2017 ◽  
Vol 33 (3) ◽  
Author(s):  
Chiều Lê Văn ◽  
Duy Ngọc Vũ ◽  
Tiến Mạnh Nguyễn ◽  
Hà Thế Cao
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Activated Carbons ◽  
Absorption Capacity ◽  
Coconut Shell ◽  
Reactive Blue 19 ◽  
Surface Areas ◽  
Site Density ◽  
Specific Surface Areas ◽  
Kinetics And Isotherms

Abstract: Kinetics and isotherms of Reactive Blue 19 adsorption on two kinds of granular activated carbons from coconut shell and bamboo were determined in this study. These activated carbon are micropore materials with specific surface areas of 687 and 425 m2/g, respectively. Experimental data shows that equilibrium times are the same for both kinds of activated carbon when ininital concentration of the dye is 40 mg/L. However, maximum absorption capacity of bamboo activated carbon is about 10 times higher than that of coconut shell. This results reveals that adsorption site density on the surface plays a more important role than specific surface area.           

Preparation of activated carbons with high specific surface areas using lignin and crab shells, and their use in methane adsorption

Carbon ◽  
2015 ◽  
Vol 93 ◽  
pp. 1080 ◽  
Author(s):  
Akihiro Yamashita ◽  
Toshiki Yoshida ◽  
Aki Hidaka ◽  
Tatsuya Oshima ◽  
Yoshinari Baba
Keyword(s):  
Specific Surface ◽  
Activated Carbons ◽  
Methane Adsorption ◽  
Surface Areas ◽  
Specific Surface Areas

scholarly journals Preparation of activated carbons with high specific surface areas using lignin and crab shells, and their use in methane adsorption

TANSO ◽  
2015 ◽  
Vol 2015 (268) ◽  
pp. 154-159 ◽  
Author(s):  
Akihiro Yamashita ◽  
Toshiki Yoshida ◽  
Aki Hidaka ◽  
Tatsuya Oshima ◽  
Yoshinari Baba
Keyword(s):  
Specific Surface ◽  
Activated Carbons ◽  
Methane Adsorption ◽  
Surface Areas ◽  
Specific Surface Areas

scholarly journals Adsorption of Volatile Organic Compounds in Nitrogen Streams on Oxidized Activated Carbon Fibres

2001 ◽  
Vol 19 (5) ◽  
pp. 423-433 ◽  
Author(s):  
Feiyu Kang ◽  
Zheng-Hong Huang ◽  
Kai-Ming Liang ◽  
Jun-Bing Yang ◽  
Hui Wu
Keyword(s):  
Activated Carbon ◽  
Volatile Organic Compounds ◽  
Specific Surface ◽  
Organic Compounds ◽  
Gravimetric Method ◽  
Carbon Fibres ◽  
Surface Areas ◽  
Volatile Organic ◽  
Specific Surface Areas ◽  
Activated Carbon Fibres

Viscose rayon-based activated carbon fibres (ACFs) with low and high specific surface areas were treated with conc. HNO3, 30 wt% H2O2 and air at different temperatures. The pore textures and surface chemistries of the samples were characterized by nitrogen adsorption at 77 K and X-ray photoelectron spectroscopic (XPS) methods. The adsorption of traces of volatile organic compounds (VOCs), i.e. benzene and methyl ethyl ketone (MEK), in nitrogen streams on the samples wwa measured by a gravimetric method. The results showed that the surface oxygen complexes and pore textures of all the oxidized ACFs were modified and differed depending on whether oxidation had been conducted under gaseous or solution conditions. ACFs with different specific surface areas possessed different adsorption characteristics towards VOC vapours after subjection to oxidation treatment.

scholarly journals Activated Carbons from Hydrochars Prepared in Milk

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Salwa Haj Yahia ◽  
Kian Keat Lee ◽  
Brahim Ayed ◽  
Niklas Hedin ◽  
Tamara L. Church
Keyword(s):  
Specific Surface ◽  
Activated Carbons ◽  
Aqueous Suspension ◽  
Hydrothermal Carbonization ◽  
Normal Range ◽  
Surface Areas ◽  
Aliphatic Carbon ◽  
Mineral Components ◽  
Waste Milk ◽  
Specific Surface Areas

AbstractHydrothermal carbonization converts organics in aqueous suspension to a mixture of liquid components and carbon-rich solids (hydrochars), which in turn can be processed into activated carbons. We investigated whether milk could be used as a medium for hydrothermal carbonization, and found that hydrochars prepared from milk, with or without an added fibrous biomass, contained more carbon (particularly aliphatic carbon), less oxygen, and more mineral components than those prepared from fibrous biomass in water. Activated carbons produced from hydrochars generated in milk had lower specific surface areas and CO2 capacities than those from hydrochars formed in water; however, these differences disappeared upon normalizing to the combustible mass of the solid. Thus, in the context of N2 and CO2 uptake on activated carbons, the primary effect of using milk rather than water to form the hydrochar precursor was to contribute inorganic mass that adsorbed little CO2. Nevertheless, some of the activated carbons generated from hydrochars formed in milk had specific CO2 uptake capacities in the normal range for activated carbons prepared by activation in CO2 (here, up to 1.6 mmol g−1 CO2 at 15 kPa and 0 °C). Thus, hydrothermal carbonization could be used to convert waste milk to hydrochars and activated carbons.

scholarly journals Role of pulping process as synergistic treatment on performance of agro-based activated carbons

2019 ◽  
Vol 6 (7) ◽  
pp. 190579 ◽  
Author(s):  
Altaf H. Basta ◽  
Vivian F. Lotfy ◽  
Philippe Trens
Keyword(s):  
Specific Surface ◽  
High Performance ◽  
Activated Carbons ◽  
Sorption Properties ◽  
Surface Areas ◽  
Pseudo Second Order ◽  
Specific Surface Areas ◽  
The One ◽  
Reported Data ◽  
The Impact

To recommend the beneficial effect of the pulping process on enhancing agro-wastes as precursors for the production of high-performance activated carbons (ACs), different pulping methods (alkali, sulfite and neutral sulfite) were applied on two available Egyptian agriculture by-products (rice straw and sugar cane bagasse), using the one-step pyrolysis method and H 3 PO 4 activating agent. The adsorption performance of the different prepared ACs was evaluated in terms of Iodine Numbers and their sorption properties for removing the methylene blue (MB) from aqueous solutions. The corresponding sorption processes were also analysed using Lagergren first order, pseudo-second order and intraparticle diffusion models. Data revealed that the applied pulping conditions were effective for removing the non-cellulosic constituents of agro-residues. This was demonstrated by the hydrogen/carbon and oxygen/carbon ratios, thermal stability and IR-measurements of the final pulps. These data were effective on the particular sorption properties of RS and SCB-based ACs. Interestingly, the pulping process is a profound modification of the SCB-based fibres, on which it induced a clear increase of the specific surface areas of the corresponding ACs even though they had an impact on the sorption of MB and iodine. These values are superior to the reported data on agro-based ACs with H 3 PO 4 activators. Pulping processes therefore play a dual role in the sorption properties of ACs. The first important role is the impact on the specific surface areas and the second impact is a profound modification of the surface chemistry of the ACs. Therefore, SCB-based ACs can be seen as an economical breakthrough product, and an alternative to the high-cost commercial ACs for the purification of industrial wastewaters.

scholarly journals Effect of Hydrophilicity of Activated Carbon Electrodes on Desalination Performance in Membrane Capacitive Deionization

2019 ◽  
Vol 9 (23) ◽  
pp. 5055 ◽  
Author(s):  
Kyusik Jo ◽  
Youngbin Baek ◽  
Changha Lee ◽  
Jeyong Yoon
Keyword(s):  
Activated Carbon ◽  
Ion Exchange ◽  
Surface Chemistry ◽  
Specific Surface ◽  
Electrode Materials ◽  
Carbon Electrodes ◽  
Water Molecules ◽  
Capacitive Deionization ◽  
Surface Areas ◽  
Specific Surface Areas

Membrane capacitive deionization (MCDI) is a modification of capacitive deionization (CDI) using ion-exchange membranes (IEM) in front of the electrodes. Electrode properties, especially the specific surface area, are known to be strongly related with desalination performance in CDI, but the effects of other properties in MCDI are not fully understood. The objective of this study was to investigate the effect of hydrophilicity in activated carbon electrodes on desalination performance in MCDI. Two types of activated carbon (P60 and YS-2) whose specific surface areas were similar were used as electrode materials, but they had different hydrophilicity (i.e., P60 was originally hydrophobic and YS-2 was relatively hydrophilic due to its nitrogen-containing surface chemistry). These hydrophilic electrodes (either the electrode itself or modified with polydopamine (PDA)) led to an increase in the salt adsorption capacity (SAC) in MCDI because they facilitated the access of both ions and water molecules into the electrode pores. In particular, the SAC of the P60 electrode displayed a large increase to almost reach that of the YS-2 electrode due to the improved hydrophilicity with PDA modification and the insignificant effects of PDA modification on an already hydrophilic YS-2 electrode. Additionally, PDA-modified IEM in MCDI reduced the SAC as a result of the additional insulating PDA layer with little changes in hydrophilicity.

scholarly journals Adsorptive removal of Pb(II) ions from aqueous solution by activated carbon prepared from cabbage waste

2020 ◽  
Vol 8 ◽  
pp. 1-10
Author(s):  
Keshav Raj Paneru ◽  
Binay Kumar Jha
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Specific Surface ◽  
Metal Ion ◽  
Activated Carbons ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Adsorption Method ◽  
Surface Areas

The present study deals with the adsorption of Pb(II) from an aqueous solution on activated carbon obtained from cabbage waste. Such activated carbon was prepared by pyrolysis of cabbage waste powder at 700 °C for 1 hour in three different atmospheres, namely open air (CWAC-O), nitrogen (CWAC-N) and nitrogen with steam (CWWAC-NW). The specific surface areas of thus obtained three types of activated carbons were determined by methylene blue adsorption method and found for CWAC-O, CWAC-N and CWAC-NW as 59, 169 and 310 m2/g, respectively. Due to the highest specific surface area of CWAC-NW, the adsorption of Pb(II) experiments was performed onto CWAC-NW only. The influence of various parameters like pH, adsorbent dose, contact time and different initial concentrations of metal ion on adsorption of Pb(II) were studied. The equilibrium data for adsorption was analyzed by using Langmuir and Freundlich isotherm models. The Langmuir adsorption isotherm model was found the best fit for the experimental data. The maximum adsorption capacity was 54.945 mg/g. Kinetics results were described by a pseudo second order model with the rate constant value 0.055 g/(mg∙min). The main mechanism of the adsorption process was physicochemical adsorption and was not solely intraparticle diffusion.

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