Investigation of mechanism of heavy metals (Cr6+, Pb2+&amp; Zn2+) adsorption from aqueous medium using rice husk ash: Kinetic and thermodynamic approach

Priya, A.K.; Yogeshwaran, V.; Rajendran, Saravanan; Hoang, Tuan K.A.; Soto-Moscoso, Matias; Ghfar, Ayman A.; Bathula, Chinna

doi:10.1016/j.chemosphere.2021.131796

Cited by 111 publications

(45 citation statements)

References 33 publications

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“…In addition, it also has the ability to process a high volume of wastewater minus the production of noxious sludge [ 13 ]. Low-cost and environmentally friendly adsorbents such as chitosan [ 14 , 15 ], clay materials [ 16 , 17 , 18 ], rice husk ash [ 19 ], spent coffee ground [ 20 ], crab shells [ 21 ], and tea leaves [ 22 ] have recently gained attention as alternatives to commercial adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Fixed-Bed Adsorption of Lead from Aqueous Solution Using Chitosan-Coated Bentonite

Futalan

Wan

2022

IJERPH

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In this study, fixed-bed adsorption of Pb(II) from an aqueous solution using chitosan-coated bentonite (CCB) was investigated. Characterization of CCB was performed using Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The effects of varying bed height (1.3 to 4.3 cm), flow rate (0.20 to 0.60 mL/min), and initial concentration (500 to 1500 mg/L) on the length of mass transfer zone (Zm) and adsorption capacity at breakthrough (qb) and exhaustion (qe) were examined. Low flow rate and high bed height were determined to cause a longer time to reach breakthrough and exhaustion. Meanwhile, the fixed-bed system was observed to quickly attain breakthrough and exhaustion under high initial concentrations. Kinetic column models such as the Thomas, Yoon–Nelson, and Clark models were used to predict the breakthrough curves. High R2 values (0.9758 ≤ R2 ≤ 0.8087) were attained for the Thomas model, which indicates that there is good agreement between experimental data and linear plots generated by the Thomas model. Moreover, the Thomas model is best in describing the breakthrough curves of Pb(II) removal under a fixed-bed system.

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Section: Introductionmentioning

confidence: 99%

Fixed-Bed Adsorption of Lead from Aqueous Solution Using Chitosan-Coated Bentonite

Futalan

Wan

2022

IJERPH

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“…This model is typically associated with the chemisorption processes of gases on solid surfaces with a low or no desorption process, where the adsorption rate decreases while the surface coverage rises up [ 41 ]. This model has been effectively applied with the adjustment of batch and ion exchange adsorption experimental results of several metals from water onto different materials, such as Cr(III) and Cu(II) on peanut shell, Cr(VI), Pb(II) and Zn(II) on rice husk ash or Zn(II), Fe(III), Cu(II), Co(II) and Ni(II) on solvent-impregnated resins [ 42 , 43 , 44 ]. The results mentioned by these authors were achieved while treating concentrated solutions of metals between 10 mg·L −1 and several g·L −1 , confirming that the observed behavior is only representative of highly chromium-polluted wastewaters.…”

Section: Resultsmentioning

confidence: 99%

Hexavalent Chromium Removal from Industrial Wastewater by Adsorption and Reduction onto Cationic Cellulose Nanocrystals

et al. 2022

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Cationic cellulose nanocrystals (CCNC) are lignocellulosic bio-nanomaterials that present large, specific areas rich with active surface cationic groups. This study shows the adsorption removal of hexavalent chromium (Cr(VI)) from industrial wastewaters by the CCNC. The CCNC were synthetized through periodate oxidation and Girard’s reagent-T cationization. The high value of CCNCs cationic groups and anionic demand reveal probable nanocrystal-Cr(VI) attraction. Adsorption was performed with synthetic Cr(VI) water at different pH, dosage, Cr(VI) concentration and temperature. Fast removal of Cr(VI) was found while operating at pH 3 and 100 mg·L−1 of dosage. Nevertheless, a first slower complete removal of chromium was achieved by a lower CCNC dosage (40 mg·L−1). Cr(VI) was fully converted by CCNC into less-toxic trivalent species, kept mainly attached to the material surface. The maximum adsorption capacity was 44 mg·g−1. Two mechanisms were found for low chromium concentrations (Pseudo-first and pseudo-second kinetic models and continuous growth multi-step intraparticle) and for high concentrations (Elovich model and sequential fast growth-plateau-slow growth intraparticle steps). The Sips model was the best-fitting isotherm. Isotherm thermodynamic analysis indicated a dominant physical sorption. The Arrhenius equation revealed an activation energy between physical and chemical adsorption. CCNC application at selected conditions in industrial wastewater achieved a legal discharge limit of 40 min.

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“…The 2933.33 cm −1 peak referring to the stretching of the C-H bonds of the hydrocarbons became more discreet, while those in the 1200 to 1500 cm −1 range showed a number of peaks and a reduction in width. The peak of 1606.20 cm −1 can be associated with the structure of the aromatic compounds probably from the lignin structure [ 50 , 84 ], suggesting the permanence of its structure after alkalinization. Similarly, it occurred at 1730.95 cm −1 in the C=O stretches related to carboxylic groups, such as carboxylic and ester [ 12 , 39 , 85 ].…”

Section: Resultsmentioning

confidence: 99%

“…The Pb(II) ion is considered as one of the most dangerous toxic metals for the ecosystem and is frequently studied in adsorptive assays testing raw or chemically modified vegetal materials [ 43 , 44 , 45 , 46 , 47 , 48 , 49 ]. Its removal from effluents produced from activities in the manufacture of ceramics, paints, plastics, automotive parts and batteries is extremely important to avoid problems in the aquatic environment, due to its bio-accumulative, non-biodegradable characteristics and its toxicity to plants and animals occurring even at low concentrations [ 50 , 51 , 52 ]. The effects and consequences of exposure to low and high doses of lead include headaches, stomach and muscle pain, fatigue and vomiting, anemia, liver damage, nervous system disorders, cognitive problems such as memory loss and psychological and reproductive issues [ 53 , 54 ].…”

Section: Introductionmentioning

confidence: 99%

Pb(II) Ion Removal Potential in Chemically Modified Ziziphus joazeiro Barks

Santos

Costa²,

Menezes

et al. 2022

IJERPH

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In this study, five types of modified Ziziphus joazeiro barks were investigated for the removal of Pb(II) ions from aqueous solutions. The samples tested were natural barks, natural powder, washed with water, ethanol at 80% (EE) and 0.5 N NaOH. Batch kinetics experiments were performed under the conditions: 24–25 °C, pH 5.5–5.8, 102 mg·L−1 Pb(NO3)2, 100 rpm and 0.1 g of adsorbent, and analyses of pHpzc and Fourier transform infrared spectroscopy. All adsorbents tested showed potential to remove Pb(II) ions, but the adsorbent washed by 0.5 N NaOH obtained the highest experimental performance (25.5 mg·g−1 at 30 min), while the EE had the least performance (20.4 mg·g−1 at 60 min), and maximum removals of 99.9%. The kinetic models pointed to a probable chemisorption due to the best fit of pseudo-second order and Elovich, and Boyd’s model, suggesting that intraparticle diffusion limits the adsorption until the initial minutes of contact. The Langmuir isotherm fitted better to the experimental data for the NaOH adsorbent, with maximum adsorption capacity equal to 62.5 mg·g−1, although the Temkin model partially fitted, both suggesting the occurrence of chemisorption. The adsorption process is reversible (>81% at 20 min) and hence the adsorbents can be recycled and the Pb(II) ions recovered.

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Investigation of mechanism of heavy metals (Cr6+, Pb2+& Zn2+) adsorption from aqueous medium using rice husk ash: Kinetic and thermodynamic approach

Cited by 111 publications

References 33 publications

Fixed-Bed Adsorption of Lead from Aqueous Solution Using Chitosan-Coated Bentonite

Fixed-Bed Adsorption of Lead from Aqueous Solution Using Chitosan-Coated Bentonite

Hexavalent Chromium Removal from Industrial Wastewater by Adsorption and Reduction onto Cationic Cellulose Nanocrystals

Pb(II) Ion Removal Potential in Chemically Modified Ziziphus joazeiro Barks

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