Alkali modified hydrochar of grape pomace as a perspective adsorbent of Pb2+ from aqueous solution

Petrović, Jelena; Stojanović, Mirjana; Milojković, Jelena; Petrović, Marija; Šoštarić, Tatjana; Laušević, Mila; Mihajlović, Marija

doi:10.1016/j.jenvman.2016.07.081

Cited by 128 publications

(82 citation statements)

References 32 publications

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“…S2(b)). Similar observations were reported by Petrovic et al (2016) after alkali treatment of biochars. In addition, the FTIR spectra became more intense after H 2 O 2 modification, particularly at 1640 cm⁻ 1 which is assigned to the vibrations of C=O bands (ester) ( Fig.…”

Section: Characterization Of Raw and Chemically Modified Biocharssupporting

confidence: 90%

Lead sorption by biochar produced from digestates: Consequences of chemical modification and washing

Wongrod

Simon

Guibaud

et al. 2018

Journal of Environmental Management

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The main objectives of this work are to investigate the consequences of different chemical treatments (i.e. potassium hydroxide (KOH) and hydrogen peroxide (HO)) and the effect of biochar washing on the Pb sorption capacity. Biochars derived from sewage sludge digestate and the organic fraction of municipal solid waste digestate were separately modified with 2 M KOH or 10% HO followed by semi-continuous or continuous washing with ultrapure water using batch or a column reactor, respectively. The results showed that the Pb adsorption capacity could be enhanced by chemical treatment of sludge-based biochar. Indeed, for municipal solid waste biochar, the Pb maximum sorption capacity was improved from 73 mg g for unmodified biochar to 90 mg g and 106 mg g after HO and KOH treatment, respectively. In the case of sewage sludge biochar, it increased from 6.5 mg g (unmodified biochar) to 25 mg g for HO treatment. The sorption capacity was not determined after KOH treatment, since the Langmuir model did not fit the experimental data. The study also highlights that insufficient washing after KOH treatment can strongly hinder Pb sorption due to the release of organic matter from the modified biochar. This organic matter may interact in solution with Pb, resulting in an inhibition of its sorption onto the biochar surface. Continuous column-washing of modified biochars was able to correct this issue, highlighting the importance of implementing a proper treated biochar washing procedure.

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Section: Characterization Of Raw and Chemically Modified Biocharssupporting

confidence: 90%

Lead sorption by biochar produced from digestates: Consequences of chemical modification and washing

Wongrod

Simon

Guibaud

et al. 2018

Journal of Environmental Management

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“…Oxygenic functional groups are verified by the peaks at 1,620; 1,170; 1,090 and 1,060 cm -1 , which are attributed to -OH vibrations and C=O/C-O vibrations. Similar results were reported by Petrović [25]. Therefore, FTIR analysis suggests the aromatic structure of ABC with oxygenic functional groups.…”

Section: Regeneration Of Adsorbentsupporting

confidence: 89%

“…Previous studies reported that cold potassium hydroxide activation of hydrochar was effective to enhance adsorption of heavy metals [24,25]. Cold potassium hydroxide activation is a promising modification for commercial application owing to low cost and easy operation.…”

Section: Introductionmentioning

confidence: 99%

Pb(II) removal from aqueous solution by cold KOH activated biochar of camphor leaves: isotherms, kinetics and thermodynamics

Cui¹,

Wang²,

Zhang³

2019

Desalination and Water Treatment

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a b s t r a c tBiochar from camphor leaves was activated by low-cost cold KOH process (ABC) to improve Pb(II) removal from aqueous solution. Then ABC was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and N 2 adsorption-desorption to reveal the benefits of cold KOH activation. The high adsorption capacity of ABC mainly results from oxygen-containing groups, porous structure and large surface area. Effect of factors including dose of ABC, pH, ionic strength, adsorption time, and temperature on Pb(II) adsorption was investigated by monofactor experiments. Through comparison with biochar (BC), optimization of ABC adsorption was revealed by kinetics, isotherms and thermodynamics. Pb(II) adsorption onto ABC is well described by pseudo-second-order kinetics and Langmuir isotherm, implying that chemisorption and monolayer adsorption are the rate-limiting steps. The thermodynamics indicates that Pb(II) adsorption onto ABC is spontaneous and exothermic. After cold KOH activation, the maximum adsorption capacity of Pb(II) onto ABC is 90.09 mg g -1 , higher than 62.27 mg g -1 of BC. ABC has an excellent dynamic and thermodynamic performance comparing with BC.

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“…The sorption capacity rises from 4.62 mg/g, at initial concentration of 5 mg/L, to 26.4 mg/g at initial concentration of 100 mg/L. It is evident that the enhancement of initial solution concentration is a mighty driven force to overcome mass transfer resistance of copper ions between solid and liquid phase (21). The effect of contact time between sorbent SF and metal solution is presented in Figure 3c.…”

Section: Operating Parametersmentioning

confidence: 92%

Adsorption of Cu(II) ions from synthetic solution by sunflower seed husks

et al. 2019

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Annual production of the sunflower seed in Serbia is between 650,000-720,000 tons. Most of this amount is used in vegetable oil industry. Abundant by-products from this processing are sunflower seed husks. Husks are usually incinerated by vegetable oil producers in order to obtain energy, used as an animal feed, or, unfortunately, landed up at some landfills. In order to promote new, added value for this abundant, renewable resource, the investigation presented in this paper was conducted. For that purpose, adsorption of Cu(II) ions from synthetic solution by unmodified sunflower seed husks was examined. ATR-FTIR was used to identify functional groups as potential active sites for Cu(II) sorption. Zeta potential values were determined to reveal the surface charge, while the cation exchange capacity (CEC) was determined to reveal the amount of exchangeable ions on its surface. ATR-FTIR analysis revealed the presence of specific functional groups (hydroxyl, carboxyl, carbonyl, and amine) responsible for removal of Cu(II) ions. The total CEC of sunflower husk is 47.74 meq/100g and Ca(II) and Mg(II) ions are in dominant exchangeable positions. The study of ion-exchange mechanism involvement was done and results confirmed that this mechanism is not the only mechanism which is involved in copper sorption. Also, the results show that the Cu(II) ions have preference for Mg(II) ions substitution. Sorption experiments were conducted in batch system. The effect of operating parameters (pH, contact time, initial concentration of Cu(II) ions and adsorbent dosage) on the adsorption capacity were investigated. The obtained experimental data were fitted by Langmuir and Freundlich isotherm models. The maximum adsorption capacity for Cu(II) ions calculated from Langmuir adsorption isotherm was 34.89 mg/g which is 15 to 35% higher than the capacity that other researchers reported previously for the same material and pollutant. These results are suggesting that sunflower seed husks have a potential to be applied as an effective adsorbent of copper ions from contaminated waters.

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Alkali modified hydrochar of grape pomace as a perspective adsorbent of Pb2+ from aqueous solution

Cited by 128 publications

References 32 publications

Lead sorption by biochar produced from digestates: Consequences of chemical modification and washing

Lead sorption by biochar produced from digestates: Consequences of chemical modification and washing

Pb(II) removal from aqueous solution by cold KOH activated biochar of camphor leaves: isotherms, kinetics and thermodynamics

Adsorption of Cu(II) ions from synthetic solution by sunflower seed husks

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