Adsorption of Co(II) from aqueous solutions onto rice husk modified by ultrasound assisted and supercritical technologies

Franco, Dison S.P.; Cunha, Jeanine Muller da; Dörtzbacher, G. F.; Dotto, Guilherme L.

doi:10.1016/j.psep.2017.03.029

Cited by 33 publications

(6 citation statements)

References 45 publications

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“…This has been associated with the environmental issues caused by large quantities of agricultural wastes. Much work has been done in the study and preparation of activated carbons from these cellulosic materials such as rice husk ( [26]; [66]; [30,31,105]), almond shells [106][107][108][109], chickpea husk [110], coconut shell [9,81,111,112], durian shell [53], oil palm shells [40,54,113], peanut hulls [107,114,115], pistachio nut shell [67], hazelnut shell [106,116], Eucalyptus globulus [22,117], macadamia nutshell [118,119] and pine cone [110].…”

Section: Shells and Husksmentioning

confidence: 99%

Production and applications of activated carbons as adsorbents from olive stones

Saleem

Shahid

Hijab

et al. 2019

Biomass Conv. Bioref.

324

152

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Olive stones have been widely used as a renewable energy biowaste source. As they are rich in elemental carbon (40-45 wt%), much research focussed on effectively converting olive stones, as precursors, into activated carbon adsorbents. However, only a few studies have concentrated on summarising the various techniques used to produce activated carbon from olive stone. This article reviews the research undertaken on the production and application of activated carbon as an adsorbent from olive stones for wastewater treatment. Various physical, chemical and physico-chemical treatments to remove heavy metals, organics and dyes are discussed, and the resultant adsorption capacities are reported. In several cases, very high adsorption capacities are recorded. Finally, the future prospects of these materials as adsorbents are discussed, and after further development work, olive stone-derived activated carbons have great potential especially in the area of organic polluted wastewaters.

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Section: Shells and Husksmentioning

confidence: 99%

Production and applications of activated carbons as adsorbents from olive stones

Saleem

Shahid

Hijab

et al. 2019

Biomass Conv. Bioref.

324

152

View full text Add to dashboard Cite

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“…The physicochemical characteristics of rice husk such as water resistance (insolubility), chemical stability, and physically high structural strength make it a good adsorbent. Moreover, cellulose, hemicellulose, and lignin are the major contents in rice husk that contain functional groups, which can be possible adsorption sites [ 8 , 21 ]. However, some modifications, thermal or chemical, need to be carried out before rice husk can be effectively applied as an adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Cu(II) Adsorption from an Aqueous Solution Using an Artificial Neural Network (ANN)

et al. 2020

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This research optimized the adsorption performance of rice husk char (RHC4) for copper (Cu(II)) from an aqueous solution. Various physicochemical analyses such as Fourier transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FESEM), carbon, hydrogen, nitrogen, and sulfur (CHNS) analysis, Brunauer–Emmett–Teller (BET) surface area analysis, bulk density (g/mL), ash content (%), pH, and pHZPC were performed to determine the characteristics of RHC4. The effects of operating variables such as the influences of aqueous pH, contact time, Cu(II) concentration, and doses of RHC4 on adsorption were studied. The maximum adsorption was achieved at 120 min of contact time, pH 6, and at 8 g/L of RHC4 dose. The prediction of percentage Cu(II) adsorption was investigated via an artificial neural network (ANN). The Fletcher–Reeves conjugate gradient backpropagation (BP) algorithm was the best fit among all of the tested algorithms (mean squared error (MSE) of 3.84 and R2 of 0.989). The pseudo-second-order kinetic model fitted well with the experimental data, thus indicating chemical adsorption. The intraparticle analysis showed that the adsorption process proceeded by boundary layer adsorption initially and by intraparticle diffusion at the later stage. The Langmuir and Freundlich isotherm models interpreted well the adsorption capacity and intensity. The thermodynamic parameters indicated that the adsorption of Cu(II) by RHC4 was spontaneous. The RHC4 adsorption capacity is comparable to other agricultural material-based adsorbents, making RHC4 competent for Cu(II) removal from wastewater.

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“…In fact, palm oil demonstrated the selective adsorption between αand β-carotenes by Tonsil Opt 210 FF, being the last one preferably adsorbed (Ribeiro et al, 2018). Also, it indicated a strong competition for adsorption sites between adsorbed species or molecules from the solvent (Franco, Cunha, Dortzbacher, & Dotto, 2017).…”

Section: Equilibriummentioning

confidence: 96%

Elucidating how two different types of bleaching earths widely used in vegetable oils industry remove carotenes from palm oil: Equilibrium, kinetics and thermodynamic parameters

Almeida

Carvalho

Soares

et al. 2019

Food Research International

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This work compared the mechanisms of adsorption of carotenes from hybrid palm oil onto two kinds of bleaching earths widely used by industrial refiners (acid-activated and neutral). First, it was performed a deep characterization of adsorbent surfaces: acid activated adsorbent showed micropore volumes twice larger than the neutral. FTIR analysis of adsorbent after adsorption demonstrated that active site was Si-O-Si for both adsorbents. However, comparison of peak shapes suggested distinctive interactions between adsorbent/adsorbate for each adsorbent. Latterly, an extensive kinetic and equilibrium study was performed. Kinetic data were in accordance with pseudo-first and pseudo-second-order models. Adjusting to the intra-particle diffusion model evidenced more than one mechanism controlling the adsorption process. Equilibrium data demonstrated adsorption is only favorable at low carotene concentration at liquid phase for acid adsorbent (lower than 1 mg/ mL). For neutral adsorbent, it was not clearly observed a favorable region with the studied conditions. The acid adsorbent could adsorb more carotenes per adsorbent weight than neutral. Finally, neutral adsorbent showed higher heterogeneity of interaction between adsorbate and adsorbent than the acid, especially at low adsorbent coverages.

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Adsorption of Co(II) from aqueous solutions onto rice husk modified by ultrasound assisted and supercritical technologies

Cited by 33 publications

References 45 publications

Production and applications of activated carbons as adsorbents from olive stones

Production and applications of activated carbons as adsorbents from olive stones

Modeling of Cu(II) Adsorption from an Aqueous Solution Using an Artificial Neural Network (ANN)

Elucidating how two different types of bleaching earths widely used in vegetable oils industry remove carotenes from palm oil: Equilibrium, kinetics and thermodynamic parameters

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