Process optimization of adsorption of Cr(VI) on activated carbons prepared from plant precursors by a two-level full factorial design

Gottipati, Ramakrishna; Mishra, Susmita

doi:10.1016/j.cej.2010.03.015

Cited by 129 publications

(56 citation statements)

References 39 publications

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“…The collected AR was dried at 110 • C in a hot air oven, shredded using hammer mill and sieved in the size range of 50-55 m. Chemical activation of AR was done using 60% ortho-phosphoric acid in 1:2.5 weight ratio (AR:acid) and stirred to ensure a complete reaction between H 3 PO 4 and AR particles for 10 h and dried at 110 • C [17][18][19][20]. The dried material was calcined in a muffle furnace starting from room temperature to 400 • C (time period of 1.5 h) and then soaked in 2% NaHCO 3 to remove the residual acid left on the adsorbent.…”

Section: Adsorbent Preparationmentioning

confidence: 99%

Hexavalent chromium removal from aqueous solution by algal bloom residue derived activated carbon: Equilibrium and kinetic studies

Hong

Tang

Cai

et al. 2010

Journal of Hazardous Materials

164

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Section: Adsorbent Preparationmentioning

confidence: 99%

Hexavalent chromium removal from aqueous solution by algal bloom residue derived activated carbon: Equilibrium and kinetic studies

Hong

Tang

Cai

et al. 2010

Journal of Hazardous Materials

164

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“…processes, but the practical utilization of this resource as an effective treatment option in sugar and ethanol industries for recycling of waste is limited (Purnomo et al, 2012). Moreover, the efficiency of the adsorption technology of activated carbon depends on the nature of the adsorbent, activating agent and activation condition, which generate different surface areas and pore volumes for the interactions between the adsorbate and adsorbent (Gottipati and Mishra, 2010).…”

Section: Introductionmentioning

confidence: 99%

COD and colour removal from molasses spent wash using activated carbon produced from bagasse fly ash of Matahara sugar factory, Oromiya region, Ethiopia

Nure¹,

Shibeshi²,

Leta³

et al. 2017

WSA

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The aim of this study was to investigate the removal of chemical oxygen demand (COD) and colour from a melanoidin solution using activated carbon produced from bagasse fly ash (BFA). Melanoidins are heterogeneous polymers and major contributors to the dark brown colour of molasses spent wash, which is an extensive cause of environment pollution. The surface area of the BFA was determined as 160.9 ± 2.8m²/g with 90% of particle less than 156.8 µm in size. Characterization of the BFA by Fourier transform infrared spectroscopy (FTIR) showed the presence of hydroxyl and carbonyl functional groups, whereas X-ray diffraction analysis indicated its amorphous nature. Moreover, scanning electron microscopy analysis showed a heterogeneous and irregular shape of pores. Among the adsorption isotherm models analysed, the Freundlich model fitted best to the experimental data, indicating a maximum adsorptive capacity of 124.80 mg/g. The removal of COD and colour from a melanoidin solution with this activated carbon was carried out using an experimental design taking 4 factors into account. These were adsorbent dose, contact time, pH and initial COD concentration, with removal of COD and colour as response variables. COD reduction was influenced by initial COD concentration whereas colour removal was dominated by contact time, which was in line with the findings of principal component analysis . The maximum COD removal recorded was 61.6% at the optimum condition of adsorbent dose of 4 g in 100 mL, contact time of 4 h, pH 8 and initial COD concentration 6 000 mg/L, whereas the decolourization of melanoidin solution was 64% at adsorbent dose of 4 g, contact time 4 h, pH 3 and initial COD concentration 6 000 mg/L. Hence, activated BFA is a promising option for simultaneous removal of COD and colour from molasses spent wash under the stated conditions.

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“…The order of factors from high to low contribution on removal efficiency are adsorbent dosage and squared term of adsorbent dosage for sepiolite, and adsorbent dosage and concentration for clinoptilolite. The increase in the dye sorption with increasing the sorbent dosage can be ascribed to the greater surface area and the accessibility of more adsorption sites (Im et al, 2012;Gottipati et al, 2010;Hameed et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

Optimization study of adsorption of crystal violet and congo red onto sepiolite and clinoptiolite

2017

Global NEST Journal

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The purpose of this study was to investigate the adsorption properties of locally available sepiolite and clinoptilolite materials as adsorbents for the removal of crystal violet and congo red dye ions from aqueous solution. Previous experiments have revealed that two variables, concentration and adsorbent dosage, have a significant effect on removal efficiency. In order to find the set of operating conditions for these variables that result in the best removal efficiency, central composite design of experiments was utilized. The results showed that sepiolite is a suitable material with 99% removal efficiency for the adsorption of both crystal violet and congo red from aqueous solution. However, in spite of clinoptilolite is also a suitable adsorbent for crystal violet, removal efficiency of congo red is rather low.

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Process optimization of adsorption of Cr(VI) on activated carbons prepared from plant precursors by a two-level full factorial design

Cited by 129 publications

References 39 publications

Hexavalent chromium removal from aqueous solution by algal bloom residue derived activated carbon: Equilibrium and kinetic studies

Hexavalent chromium removal from aqueous solution by algal bloom residue derived activated carbon: Equilibrium and kinetic studies

COD and colour removal from molasses spent wash using activated carbon produced from bagasse fly ash of Matahara sugar factory, Oromiya region, Ethiopia

Optimization study of adsorption of crystal violet and congo red onto sepiolite and clinoptiolite

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