The repeated exhaustion and chemical regeneration of activated carbon

Martin, Rex E.; Ng, Wun Jern

doi:10.1016/s0043-1354(87)80014-3

Cited by 50 publications

(31 citation statements)

References 3 publications

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“…There was a constant decrease in the arsenic concentration (15 mg LG 1 ) through out the adsorption on activated carbon. Slope of Langmuir isotherm showed that there was single layer adsorption of arsenic and linear track result when the quantity 1/(x/m) was plotted against 1/C ( Martin and Ng, 1987).…”

Section: Resultsmentioning

confidence: 99%

“…Chemical adsorption occur through out the sides and corner of the adsorbent, since these sites were characterized by presence of various functional groups which participate in adsorption through electron sharing reaction (Martin and Ng, 1987). The size of carbon particle influences the rate of adsorption, which increased as the particle size decreased.…”

Section: Resultsmentioning

confidence: 99%

“…Activated carbon is a black solid material like powdered charcoal (Abdullah et al, 2001), which processed to be riddled with small, low-volume pores that increase the surface area available for adsorption or chemical reactions (Martin and Ng, 1987).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Toxic Metals Adsorption Isotherms on Activated Carbon Using Locally Design Jar Test Apparatus

Bhatti¹,

Maqbool²,

Qayyum³

et al. 2015

Science, Technology and Development

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Abstract:Toxic metals are present as micropollutants in the water bodies, which are difficult to remove. In the present study 4 different metals (Cd, Cu, Pb and As) adsorption on activated carbon was performed. For this purpose new jar test apparatus was manufactured. The removal efficiency of these metals was checked by applying different adsorption isotherm. The Langmuir showed single layer adsorption while, Freundlich and Brunaur-Emmet-Teller (BET) isotherms showed multi layer of metals molecules on activated carbon. Different metal concentrations were used as 5, 10 and 15 mg LG 1 and the comparative adsorption isotherm showed the removal rate of metals were as Cd>Cu>Pb>As at 15 mg LG 1 concentration. Cadmium followed the BET isotherm which indicated multilayer adsorption on activated carbon while As, Cu and Pb showed single layer adsorption. It is concluded from the result that activated carbon is the promising technique for the removal of Cd and to certain extend for Cu and Pb.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Characterization of Toxic Metals Adsorption Isotherms on Activated Carbon Using Locally Design Jar Test Apparatus

Bhatti¹,

Maqbool²,

Qayyum³

et al. 2015

Science, Technology and Development

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show abstract

“…In these methods, a rinse step must be carried out between the regeneration and the adsorption steps because the presence of the regenerating agent within the From a technical point of view, the access of SCCO 2 to the inner micropores does not mean a problem for the regeneration procedure, in contrast to other regeneration methods like solvent regeneration or NaOH regeneration. In these methods, a rinse step must be carried out between the regeneration and the adsorption steps because the presence of the regenerating agent within the structure of the adsorbent hinders the subsequent adsorption [35][36][37][38]. In a similar way to SCCO 2 regeneration, the regenerating agents must reach all the micropores to efficiently regenerate the exhausted adsorbents, what makes the rinse step trickier.…”

Section: Mass Transfer Limitations: Effect Of Time Flow and Pressurementioning

confidence: 99%

“…In these methods, a rinse step must be carried out between the regeneration and the adsorption steps because the presence of the regenerating agent within the structure of the adsorbent hinders the subsequent adsorption [35][36][37][38]. In a similar way to SCCO2 regeneration, the regenerating agents must reach all the micropores to efficiently regenerate the exhausted adsorbents, what makes the rinse step trickier.…”

Section: Mass Transfer Limitations: Effect Of Time Flow and Pressurementioning

confidence: 99%

Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol

et al. 2018

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Featured Application: Authors are encouraged to provide a concise description of the specific application or a potential application of the work. This section is not mandatory. Abstract:The properties of supercritical CO 2 (SCCO 2 ) and supercritical water (SCW) turn them into fluids with a great ability to remove organic adsorbates retained on solids. These properties were used herein to regenerate an activated carbon fiber (ACF) saturated with a pollutant usually contained in wastewater and drinking water, phenol. Severe regeneration conditions, up to 225 bar and 400 • C, had to be employed in SCCO 2 regeneration to break the strong interaction established between phenol and the ACF. Under suitable conditions (regeneration temperature, time, and pressure, and flow of SCCO 2 ) the adsorption capacity of the exhausted ACF was completely recovered, and even slightly increased. Most of the retained phenol was removed by thermal desorption, but the extra percentage removed by extraction allowed SCCO 2 regeneration to be significantly more efficient than the classical thermal regeneration methods. SCCO 2 regeneration and SCW regeneration were also compared for the first time. The use of SCW slightly improved regeneration, although SCW pressure was thrice SCCO 2 pressure. The pathways that controlled SCW regeneration were also investigated.

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Regeneration of phenol‐saturated activated carbon in an electrochemical reactor

Zhang

Zhong

2002

J of Chemical Tech & Biotech

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The regeneration of phenol-saturated activated carbon in an electrochemical reactor was investigated in order to develop a novel regeneration method of activated carbon. The regeneration of spent activated carbon saturated with phenol was conducted in a stirred electrochemical reactor under different operating conditions. The influences of operating parameters, such as regeneration current intensity and time, on regeneration efficiency were systematically investigated. The regeneration efficiency can reach over 80% under continuous stirring in the reactor, and it only decreases by less than 5% after four regeneration cycles. Electrochemical regeneration in the stirred electrochemical reactor is shown to be an effective method for the regeneration of phenol-saturated activated carbon with a much higher regeneration efficiency compared with a process using NaOH solution.

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The repeated exhaustion and chemical regeneration of activated carbon

Cited by 50 publications

References 3 publications

Characterization of Toxic Metals Adsorption Isotherms on Activated Carbon Using Locally Design Jar Test Apparatus

Characterization of Toxic Metals Adsorption Isotherms on Activated Carbon Using Locally Design Jar Test Apparatus

Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol

Regeneration of phenol‐saturated activated carbon in an electrochemical reactor

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