Potential of waste pumice and surface modified pumice for hexavalent chromium removal: Characterization, equilibrium, thermodynamic and kinetic study

Sepehr, Mohammad Noori; Amrane, Abdeltif; Karimaian, Kamal Aldin; Zarrabi, Mansur; Ghaffari, Hamid Reza

doi:10.1016/j.jtice.2013.07.005

Cited by 113 publications

(60 citation statements)

References 46 publications

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“…Evaluations E<8 kJ/ mol for an adsorption process determine a physical nature, and the range of 8-16 kJ/mol determines a chemical nature [1,58]. The estimated value of E is demonstrated in Table 4; results show that chemisorption is the dominant mechanism of Cr(VI) adsorption onto DPB [59]. Table 4 depicts further that the experimental data had also a good correlation with the Temkin isotherm (R 2 =0.949).…”

Section: Adsorption Modelingmentioning

confidence: 91%

Physico-chemical study of dew melon peel biochar for chromium attenuation from simulated and actual wastewaters

Ahmadi

Kouhgardi

Ramavandi

2016

Korean J. Chem. Eng.

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Abstract−This work introduces a biochar as novel adsorbent prepared from the dew melon peel by pyrolysis method, and demonstrates its potential for eliminating Cr(VI) from simulated and actual wastewaters. The dew melon peel biochar (DPB) was characterized by several techniques and methodologies such as, BET, SEM, FTIR, Boehm titration, ultimate analysis, and pHzpc. DPB is a microporous material with the BET specific surface area of 196 m 2 /g. The effects of different parameters including pH, amount of adsorbent, Cr(VI) concentration, and mixing time on the removal of Cr(VI) from wastewater were studied. Maximum adsorption (98.6%) was observed at pH 6 and 100 mg/L metal concentration. The equilibrium adsorption was analyzed by Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherms. Kinetic data were evaluated by pseudo-first order, pseudo-second order, intraparticle diffusion, film diffusion (Boyd), Elovich, and Avrami models. The kinetic data were best fitted to the pseudo-second order model. The Langmuir isotherm model gives the better correlation to predict the adsorption equilibrium, with a maximum adsorption capacity of 198.7 mg/g. The thermodynamic parameters showed that the adsorption of Cr(VI) was endothermic and spontaneous. Competition between the co-existing ions of Cl − , NO 3 − , SO 4 2− , PO 4 3− , and HCO 3 − on the adsorption process was studied. The efficacy of DPB was successfully examined by analyzing the removal of Cr(VI) from two industrial wastewaters. The results indicate that DPB is promising as an effective and economical adsorbent for Cr(VI) ions removal and could be repeatedly used with no significant loss of adsorption efficiency.

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Section: Adsorption Modelingmentioning

confidence: 91%

Physico-chemical study of dew melon peel biochar for chromium attenuation from simulated and actual wastewaters

Ahmadi

Kouhgardi

Ramavandi

2016

Korean J. Chem. Eng.

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“…From a mathematical point of view, the isotherm that best adjusts the experimental data is Freundlich's with R 2 =0.99, which means that the adsorption mechanism is controlled by chemadsorption according to Gupta and Balomajumder 35 and Sepehr, et al 36 .This result differs from that reported in previous studies by Tejada-Tovar et al 16 ,Uthra and Kadirvelu 37 , and Farhan et al 38 , who determined that the model that best fits nickel adsorption is Langmuir. From the physical point of view of the system, Freundlich's model is also the one that best predicts the behavior of the bagasse palm-nickel adsorption system, since the concentration being worked on is sufficiently high to favour the formation of several layers of adsorbed material, which is complemented by the analysis of biomass composition (Table 5), since the presence of different functional groups implies different adsorption energy in the active sites, since they do not behave in the same way to the pH and temperature conditions worked.…”

Section: Balance Modelingmentioning

confidence: 99%

Study of the Effect of Temperature in the Remotion of NI (II) on African Palm Bagasse (Elaeis guineensis)

2018

IJCTR

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: Heavy metals are pollutants released into the environment, and are highly available as a result of the increase in different activities where they are used, so their presence in aqueous media causes worldwide concern, as they pose a serious threat to ecosystems by being non-biodegradable, toxic and carcinogenic to living beings. The present work evaluated the effect of temperature and pH on the capacity of African palm bagasse (Elaeis guineensis) to remove nickel present in aqueous solutions, studying the kinetics, equilibrium and thermodynamic parameters that determine the process. For this purpose, it was tested in batch system by varying the temperature and pH of the solution, keeping constant the agitation rate (200 rpm), adsorbent dose (5 g *100ml -1 ), initial metal concentration (100 ppm) and the size of the adsorbent (0.1 mm). It was found that the best adsorption conditions were 54.9 ºC and pH 5.93, obtaining a maximum adsorption capacity of 17.01 mg g -1 corresponding to a removal of 85.14 %. The kinetic model that best fits the experimental data was Elovich and the isotherm that best describes the process is Freundlich, with R 2 of 0.9967 and 0.999, respectively. The determined thermodynamic parameters (∆H 0 , ∆G 0 , ∆S 0 ) suggest that the process is favorable, spontaneous, endothermic and reversible under certain operating conditions. The results show that palm bagasse is a good precursor of Nickel adsorbent.

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“…The adsorption equilibrium was evaluated using the Langmuir, Freundlich and Temkin isotherm models [11,26,28].…”

Section: Adsorption Isothermmentioning

confidence: 99%

“…A higher initial MG concentration level could easily increase the driving force of the mass transfer and decrease its resistance. However, increasing initial dye concentration could enhance the probability of the collision between the dye molecules and the SPM sorbing sites [28,32].…”

Section: Effect Of Contact Time and Initial Mg Concentrationmentioning

confidence: 99%

“…pH is one of the most important parameters influencing the adsorption capacity according to control of the sorbent surface charge [28]. Due to natural MG decolorization at pH > 7, effect of solution pH on the adsorption capacity was determined in the range of 2.0-6.5 value at 20, 40 and 60 mg/L initial dye concentrations at ambient temperature.…”

Section: Effect Of the Solution Phmentioning

confidence: 99%

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Malachite green removal using modified sphagnum peat moss as a low-cost biosorbent: Kinetic, equilibrium and thermodynamic studies

Hemmati

Norouzbeigi

Sarbisheh

et al. 2016

Journal of the Taiwan Institute of Chemical Engineers

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Potential of waste pumice and surface modified pumice for hexavalent chromium removal: Characterization, equilibrium, thermodynamic and kinetic study

Cited by 113 publications

References 46 publications

Physico-chemical study of dew melon peel biochar for chromium attenuation from simulated and actual wastewaters

Physico-chemical study of dew melon peel biochar for chromium attenuation from simulated and actual wastewaters

Study of the Effect of Temperature in the Remotion of NI (II) on African Palm Bagasse (Elaeis guineensis)

Malachite green removal using modified sphagnum peat moss as a low-cost biosorbent: Kinetic, equilibrium and thermodynamic studies

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