Nitric acid modification of activated carbon produced from waste tea and adsorption of methylene blue and phenol

Gökçe, Yavuz; Aktaş, Zeki

doi:10.1016/j.apsusc.2014.05.214

Cited by 296 publications

(142 citation statements)

References 36 publications

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“…This result suggested that phenols were also specifically adsorbed through the formation of donor-acceptor complexes, in which the carbonyl group of the functionalized-AC is an electron donor and the aromatic rings of phenol are electron acceptors [55]. Moreover, phenols were trapped within the pores of the solid materials, and possibly forming a strong bond through the π-π electron interaction of the benzene ring in phenol and π-electrons present with the solid materials [56,57].…”

Section: Effect Of Background Electrolyte Concentrationsmentioning

confidence: 82%

Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Lalhmunsiama

Lee

Choi

et al. 2017

Metals

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Areca nut waste was utilized to obtain high surface area activated carbon (AC), and it was further functionalized with succinic anhydride under microwave irradiation. The surface morphology and surface functional groups of the materials were discussed with the help of scanning electron microscope(SEM) images and fourier transform infra-red (FT-IR) analysis. The specific surface area of the AC and functionalized-AC was obtained by the Brunauer-Emmett-Teller (BET) method, and found to be 367.303 and 308.032 m 2 /g, respectively. Batch experiments showed that higher pH favoured the removal of Hg(II), whereas the phenol removal was slightly affected by the changes in the solution pH. The kinetic data followed pseudo-first order kinetic model, and intra-particle diffusion played a significant role in the removal of both pollutants. The maximum sorption capacity of Hg(II) and phenol were evaluated using Langmuir adsorption isotherms, and found to be 11.23 and 5.37 mg/g, respectively. The removal of Hg(II) was significantly suppressed in the presence of chloride ions due to the formation of a HgCl 2 species. The phenol was specifically adsorbed, forming the donor-acceptor complexes or π-π electron interactions at the surface of the solid. Further, a fixed-bed column study was conducted for both Hg(II) and phenol. The loading capacity of the column was estimated using the nonlinear Thomas equation, and found to be 2.49 and 2.70 mg/g, respectively. Therefore, the study showed that functionalized AC obtained from areca nut waste could be employed as a sustainable adsorbent for the simultaneous removal of Hg(II) and phenol from polluted water.

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Section: Effect Of Background Electrolyte Concentrationsmentioning

confidence: 82%

Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Lalhmunsiama

Lee

Choi

et al. 2017

Metals

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“…Activated carbon is characterized by a well-developed internal pore structure, high surface area and diversifies chemical functional groups located at the outer and inner surfaces [7,8]. Preparation of activated carbon from low cost renewable agricultural byproducts is chosen by some researchers to reduce the cost of the adsorption process [9,10]. Although that in industrial scale fixed bed adsorbers are commonly used to treat big volumes of wastewaters with continuous feed flow, adsorption studies in agitated finite batch adsorbers are necessary since they give important equilibrium and kinetic data, from which, parameters such as the effective pore diffusion of the pollutant can be evaluated and becomes useful for further fixed bed studies and for the prediction of industrial adsorber performance [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Adaptation of Modified Shrinking Core Model for the Description of Salicylic Acid Adsorption on Olive Stones Activated Carbons

Bohli¹

2017

ABB

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Abstract:This work aimed to apply a modified shrinking core model (SCM) for describing the kinetic adsorption process of a solute in a microporous activated carbon in an agitated finite batch aqueous system. To apply the SCM, the diffusionadsorption process in the pore of the adsorbent is transposed to a diagram of diffusion-reaction according to a mobile front. Indeed, solid adsorbent particle is assumed formed by two layers. The first layer is an inner core, not yet reached by the adsorbate, and the second layer is an outer shell, where diffusion and binding to particle sites are occurring. In this study, two mass transfer resistances are considered; the external liquid film resistance and intraparticle resistance. The developed modified SCM, applied to experimental data for the adsorption of salicylic acid onto olive stone activated carbons and a commercial one, give a more realistic prediction and shows a good accuracy in describing batch adsorption in mixed suspension. The kinetic parameters: the effective diffusivity and the mass transfer coefficient were determined. Using the estimated parameters, a parametric study was carried out to observe the effects of the particle size of adsorbent, the initial adsorbate concentration and the stirring velocity on the system kinetics.

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“…Acidic modifications of surface of adsorbents increase oxygen content, weaken the dispersion forces and adsorption capacities. Another approach is acidic groups on adsorbent surface increase electrostatic attraction, molecular starking and locate of dye molecules vertically (Gokce and Aktas, 2014). …”

Section: Effect Of Phmentioning

confidence: 99%

“…A number of natural adsorbents were examined for the treatment of dyes, such as clays as an alternative to activated carbon to decrease the operation costs (Gupta, Srivastava et al, 1997, Kannan andSundaram, 2001). In recent years, various types of waste materials were applied as adsorbent for dye removal such as ash (Janoš, Buchtová et al, 2003, Mittal, Mittal et al, 2009, blast furnace dust , fertilizer waste (Gupta, Srivastava et al, 1998, slag (Ramakrishna andViraraghavan, 1997, Gupta, Ali et al, 2003), agricultural residues materials (Mittal, Krishnan et al, 2005;Mittal, Mittal et al, 2010, Ahmaruzzaman and, waste tea (Gokce and Aktas, 2014), lubrication oil/palm waste (AlOthman, Habila et al, 2014), potato plant waste (Gupta, Kushwaha et al, 2016), rice husk (Sharma, Kaur et al, 2010), cotton waste (Ertaş, Acemioğlu et al, 2010), phosphate rock (Malash and El-Khaiary, 2010), citrus limetta peel waste (Shakoor and Nasar, 2016) and red mud (Gupta, Suhas et al, 2004) etc.…”

Section: Introductionmentioning

confidence: 99%

Acid and Ultrasound Assisted Modification of Boron Enrichment Process Waste and Using for Methylene Blue Removal from Aqueous Solutions

2018

Issue 2

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ultrasound assisted modification of boron enrichment process waste and using for methylene blue removal from aqueous solutions, Global NEST Journal, 20(X), XX-XX. AbstractIn this study, raw boron enrichment waste was treated with hydrochloric acid and ultrasound at 35-kHz frequency for 60 minutes. To optimize the adsorption conditions for removal of methylene blue (MB) from synthetic wastewaters using raw boron enrichment waste (BEW), acid modified boron enrichment waste (HBEW) and ultrasound modified BEW (UBEW) by adsorption process and to compare the adsorption efficiency of chemical and ultrasonic modifications of BEW were aimed. The optimum adsorption conditions were determined economically and eco-friendly aspect and MB removal percents were found as 80%, 80% and 92% at optimum conditions for BEW, HBEW and UBEW, respectively. The maximum regression coefficient values were obtained as 0.911, 0.998 and 0.984 for BEW, HBEW and UBEW, respectively at Langmuir isotherm model. The adsorption rate was fitted well to pseudo-second order kinetics according to a good correlation coefficient. The adsorption of MB onto adsorbents studied is spontaneous in nature and feasible because of negative ∆G values. The results indicated that the boron enrichment process waste could be a suitable adsorbent for removal of MB from aqueous solution. The maximum adsorption capacities were equal to about 107,0 mg/g, 160,7 mg/g and 145,3 mg/g for BEW, HBEW and UBEW adsorbents at 298 K, respectively. The maximum dye removal percent was achieved for UBEW as 92% and ultrasound assisted modification was found more efficient method compared with acidic modification for MB removal.

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Nitric acid modification of activated carbon produced from waste tea and adsorption of methylene blue and phenol

Cited by 296 publications

References 36 publications

Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Adaptation of Modified Shrinking Core Model for the Description of Salicylic Acid Adsorption on Olive Stones Activated Carbons

Acid and Ultrasound Assisted Modification of Boron Enrichment Process Waste and Using for Methylene Blue Removal from Aqueous Solutions

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