Studies on desorption and regeneration of natural pumice for iron removal from aqueous solution

Indah, Shinta; Helard, Denny; Binuwara, A.

doi:10.2166/wst.2018.177

Cited by 29 publications

(18 citation statements)

References 14 publications

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“…It implied that adsorption of heavy metals onto AC-NLP was reversible process, as per discussed in chemical kinetic study. Further, total regeneration was not achieved due to adsorption was chemisorption and strong bond was formed between heavy metal and AC-NLP during adsorption; and not disintegrated even strong acid, hydrochloric acid 39 , 40 .…”

Section: Resultsmentioning

confidence: 99%

Batch and continuous fixed bed adsorption of heavy metals removal using activated charcoal from neem (Azadirachta indica) leaf powder

Patel¹

2020

Sci Rep

118

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The present investigate was intended for adsorption of heavy metals i.e. Pb, Cu, Cr, Zn, Ni and Cd onto activated charcoal prepared from neem leaf powder (AC-NLP) using batch and column studies. Batch adsorption was performed using different variables like adsorbent dose, temperature and contact duration. Thermodynamic analysis of batch treatment concluded that adsorption is thermodynamically feasible and endothermic. This adsorption followed the Pseudo second-order kinetic model derived from correlation coefficient values of chemical kinetic studies. For column study, interpretation of breakthrough curves and parameters were conducted by varying flow rate, initial concentration and bed height; and reveal that optimum conditions were lower flow rate (5 mL/min) and lower initial concentration (5 mg/L) and higher bed height (20 cm). Comparisons of batch and column study through isotherm models were evaluated and column study is more preferred than batch treatment. Maximum Thomas adsorption capacity was achieved upto 205.6, 185.8, 154.5, 133.3, 120.6, 110.9 mg/g for Pb, Cu, Cd, Zn, Ni and Cr respectively. This removal pattern is elucidated by metal ionic properties. Various adsorbing agents such as acids and bases were utilized for adsorption–desorption of AC-NLP.

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Section: Resultsmentioning

confidence: 99%

Batch and continuous fixed bed adsorption of heavy metals removal using activated charcoal from neem (Azadirachta indica) leaf powder

Patel¹

2020

Sci Rep

118

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“…Pumice is a rock formed as a result of volcanic eruptions with a large surface area and a skeletal structure, including open channels that allow water and ions to enter and exit the crystal structure. It can also be easily processed in metal removal and can be used as a suitable material due to its low cost (Amin et al 2018;Indah et al 2018;Guler and Cebeci 2017). Pumice having basic and acidic character has a high silica content that makes a negatively charged surface.…”

Section: Introductionmentioning

confidence: 99%

Effect of structural differences of pumice on synthesis of pumice-supported nFe0: removal of Cr (VI) from water

et al. 2021

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In this study, pumice from different regions of Turkey (Diyarbakir, Southeast Turkey and Bitlis, East Turkey) has been supplied and used as supporting material for nanoscale zero-valent iron (nFe0). Native Bitlis pumice (NBP)-supported nanoscale zero-valent iron (BP-nFe0) and native Diyarbakir pumice (NDP)-supported nanoscale zero-value iron (DP-nFe0) were synthesized under the same conditions. Native pumice (NDP, NBP) and pumice-supported nFe0 (DP-nFe0 and BP-nFe0) adsorbents were morphologically and structurally characterized by SEM, EDX, XRF and BET. When using NBP as support material, the iron content of the BP-nFe0 increased 1.9-fold from 1.99 to 3.83%. However, iron content of NDP (2.08%) increased approximately 29 times after it is used as a support material in synthesis of DP-nFe0 (60%). The removal potential of native pumice (NBP and NDP) and iron-modified pumice (BP-nFe0 and DP-nFe0) samples was investigated to remove Cr(VI) ions. The parameters of solution pH, initial metal concentration, contact time and the amount of adsorbent in the removal of chromium (VI) ions were investigated. Langmuir, Freundlich, Temkin, Dubinin–Radushkevich and Jovanovic isotherm models were used to evaluate the adsorption equilibrium data. The equilibrium adsorption was found so as to be well described by the Langmuir isotherm model for all the adsorbents studied. The maximum adsorption capacity of Cr(VI) ions for NDP, NBP, DP-nFe0 and BP-nFe0 was 10.82, 14.30, 161.29 and 17.39 mg/g, respectively. The rate of Cr(VI) removal was subjected to kinetic analysis using pseudo-first-order, pseudo-second-order, intraparticle diffusion and Elovich models. Kinetic studies suggest that adsorption of NDP, NBP, DP-nFe0 and BP-nFe0 described more favorably by the pseudo-second-order kinetic model. The results showed that NDP is a much better support material for nFe0 when compared to NBP.

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“…Adsorption is an effective technique for nitrate removal, as it is an effective alternative for removing ions from water, economical, easy design, and operation as well as low costs [5][6][7]. For nitrate removal, different adsorbents have been studied [8] such as geomaterials like kaolinite [9], and pumice [10,11].…”

Section: Introductionmentioning

confidence: 99%

Removal of nitrate using modified pumice as adsorbent for reducing groundwater pollution

et al. 2021

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Nitrate adsorption onto the physically and chemically modified pumice was investigated as an effort for reducing groundwater pollution. The treatments were heating at temperatures of 300°C, 450°C, and 600°C for physical and soaking in acid solutions (HCl, H2SO4, and HNO3) for chemical treatments. The adsorption was performed in a batch system at room temperature (25±1°C) with the optimum condition (pH 4; 0.3 g/L of adsorbent dose; <63 µm of adsorbent diameters and 30 minutes of contact time). The results indicated that the physically and chemically modified pumice resulted in increasing removal efficiency and nitrate uptake compared to the natural pumice. The highest removal efficiency and nitrate uptake were achieved from 300°C of heating temperatures (62.04% and 155.09 mg/g) and H2SO4 for the acid solution (83.30% and 208.25 mg/g), while by using the natural pumice only reached 57.02 % and 142.55 mg/g. The SEM images of the modified pumice confirmed the change in the surface morphology of pumice including the pore structure and surface area which can be proper sites for adsorption of pollutants. This study demonstrated that physical and chemical modification could be the potential treatment to increase the removal efficiency and nitrate uptake of the natural pumice, thus can solve the problem of groundwater pollution.

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Studies on desorption and regeneration of natural pumice for iron removal from aqueous solution

Cited by 29 publications

References 14 publications

Batch and continuous fixed bed adsorption of heavy metals removal using activated charcoal from neem (Azadirachta indica) leaf powder

Batch and continuous fixed bed adsorption of heavy metals removal using activated charcoal from neem (Azadirachta indica) leaf powder

Effect of structural differences of pumice on synthesis of pumice-supported nFe0: removal of Cr (VI) from water

Removal of nitrate using modified pumice as adsorbent for reducing groundwater pollution

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