Preparation and characterization of activated carbon from date stones by physical activation with steam

Bouchelta, Chafia; Medjram, Mohamed Salah; Bertrand, O.; Bellat, Jean-Pierre

doi:10.1016/j.jaap.2007.12.009

Cited by 420 publications

(190 citation statements)

References 42 publications

Supporting

Mentioning

176

Contrasting

Unclassified

Order By: Relevance

“…The graphitic nature of the carbon material is decrease with the increase in chemical agent ratio due to increase in porosity of the material. Figure 3 shows the adsorption isotherms of the AC materials from jute fibers which exhibit an isotherms of Type I isotherm with H4 hysteresis [35,38,[47][48][49]. This is characteristic of materials of microporous nature due to strong interaction potential between the carbon surface and N 2 .…”

Section: Hydrogen Storage Experimentsmentioning

confidence: 99%

“…From Figure 3, one can see the relationship between the specific surface areas, S BET , calculated using the BET model, and the weight ratio of KOH/carbon. It has been observed that the specific surface area increases from 382 to 1224 m 2 /g as a function of the KOH concentration [47]. The textural properties of AC from jute fibers treated at 700°C and at different KOH ratios are given in Table 2.…”

Section: Hydrogen Storage Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and characterization of activated carbon from jute fibers for hydrogen storage

Ramesh

Rajalakshmi

Dhathathreyan

2017

Renew. Energy Environ. Sustain.

View full text Add to dashboard Cite

Abstract. Activated carbons (ACs) are being used as energy storage material especially for hydrogen storage application. In the present work, AC materials were synthesized from jute fibers, activated and treated using KOH to increase the porosity of samples. These AC samples retained the fibrous structure even after chemical activation at high temperature of 700°C. Channel like structures were formed which helps to increase the hydrogen storage capacity. The surface area of these samples varied from 380 to 1220 m 2 /g due to carbonization and activation treatment. The sample with high surface area of 1224 m 2 /g showed a high hydrogen uptake capacity of 1.2 wt.% at 30°C and 40 bar of H 2 gas pressure. This sample also showed a high pore volume of 0.74 cm 3 /g. These results indicate that the raw material jute fibers can be used as hydrogen storage medium after thermal and chemical treatment which increases the surface area and micropore volume.

show abstract

Section: Hydrogen Storage Experimentsmentioning

confidence: 99%

Section: Hydrogen Storage Experimentsmentioning

confidence: 99%

Synthesis and characterization of activated carbon from jute fibers for hydrogen storage

Ramesh

Rajalakshmi

Dhathathreyan

2017

Renew. Energy Environ. Sustain.

View full text Add to dashboard Cite

show abstract

“…Langmuir isotherm is given by equation [20]: ( 8 ) This can be arranged to the linear form as shown below: (9) where, qe is the amount of Ni 2+ adsorbed (mmol g -1 ), Ce is the equilibrium concentration of the adsorbate (mM), qm is the maximum adsorption capacity (mmol g -1 ), and KL is the adsorption equilibrium constant (L mmol -1 ). The empirical Freundlich isotherm model (1906) assumes the surface of adsorbent is heterogeneous with multilayers and it is expressed as shown in equation below: (10) A linear form of the Freundlich model is given as: (11) where, KF (mmol g -1 ) and n (g L -1 ) are the Freundlich constants related to adsorption capacity and adsorption intensity, respectively. The adsorption isotherm parameters of Langmuir and Freundlich isotherms are given in Table 2.…”

Section: Fig 4 Equilibrium Isotherms Of Ni 2+ Adsorption Onto Dsb55mentioning

confidence: 99%

“…Girgis and El-Hendawy [9] used date pits for activated carbon production after chemical activation using H3PO4 acid. Bouchelta et al [10] used date seeds for AC preparation using physical activation with water vapor. However, AC is costly material due to high energy and chemicals requirements.…”

Section: Introductionmentioning

confidence: 99%

Date seed derived biochar for Ni(II) removal from aqueous solutions

2017

View full text Add to dashboard Cite

Abstract. The purpose of this study was to investigate the adsorption characteristic of biochars derived from date seed for Ni 2+ ions removal from aqueous solutions. Two biochars were prepared by slow pyrolysis of date seed for 3 h at 450 °C (DSB450) and 550 °C (DSB550). The adsorption of Ni 2+ was carried out by batch experiments at room temperature. The effects of pyrolysis temperature, contact time, initial metal concentration, and solution pH were investigated. The results showed that biochar prepared at higher temperature (DSB550) had higher adsorption capacity of Ni 2+ from aqueous solution than biochar prepared at lower temperature (DBS450). Adsorption efficiency of Ni 2+ ions was pH dependent and the maximum adsorption was found to occur at pH around 6.0. To describe the equilibrium isotherms, the experimental results were analyzed by the Langmuir, and Freundlich isotherms. The adsorption isotherm for Ni 2+ by DSB550 was best fit to Langmuir isotherm with (R 2 = 0.94). The maximum adsorption capacity of Ni 2+ of DSB550 biochar was 0.609 mmol g í1 . Pseudo-first order, pseudo-second order, and intraparticle diffusion models were used to model the kinetic parameters and mechanism of adsorption process. The results showed that the adsorption kinetics of these biochars are well described by a pseudo-second order kinetic model with correlation coefficient (R 2 = 0.99). The results of the study indicated that biochar derived from date seed biomass is a suitable material for adsorption of Ni 2+ ion from aqueous solution.

show abstract

“…The waste materials such as apricot stones [6], date stones [2], guava seeds [3] black stone cherries [7], peach stones [1 & 4], orange peel [5], Peanut shell [13] are the some examples of low-cost accessible waste materials for the production of activated carbons. Lapsi seed stone is the waste product of Lapsi fruits.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Activated carbons Prepared from a Locally Available Material by Iodine Number

Shrestha

2018

J. Inst. Engineering

View full text Add to dashboard Cite

Abstract:The adsorption of Iodine by the activated carbons prepared from a locally available material Lapsi Seed Stone has been studied. Various activated carbons were prepared by varying the parameters such as ratio of Lapsi Seed Stone particles to Phosphoric acid, percentage of phosphoric acid concentration, carbonization temperature and carbonization time. Determination of Iodine numbers of the activated carbons was done by the standard method. The effect of various preparation conditions on Iodine number of different activated carbons is also investigated. The optimum conditions for the preparation of activated carbon are found to be 400 ° C -the carbonization temperature, 4 hours -the carbonization time, 1:1-the ratio of Lapsi Seed Stone particles and Phosphoric acid and 50 %-the percentage of phosphoric acid concentration

show abstract

Preparation and characterization of activated carbon from date stones by physical activation with steam

Cited by 420 publications

References 42 publications

Synthesis and characterization of activated carbon from jute fibers for hydrogen storage

Synthesis and characterization of activated carbon from jute fibers for hydrogen storage

Date seed derived biochar for Ni(II) removal from aqueous solutions

Characterization of Activated carbons Prepared from a Locally Available Material by Iodine Number

Contact Info

Product

Resources

About