Kinetics and isotherm studies for the adsorption of metal ions onto two soil types

Mishra, Soumya Ranjan; Chandra, Rachna; Kaila, Armi; Darshi, B Savariya

doi:10.1016/j.eti.2016.12.006

Cited by 40 publications

(19 citation statements)

References 67 publications

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“…The rate of adsorption is controlled by the concentration gradient between the liquid layer surrounding the adsorbent particles and the active sites available for binding Cd(II). Thus, after equilibrium only lesser number of active sites participated in metal ions adsorption [26] and the uptake rate was governed by the rate of transport of ions from the outer to the inner sites of adsorbent.…”

Section: Resultsmentioning

confidence: 99%

Removal of Cd(II) from Aqueous Solution Using Dried Plant (Azadirachta indica) Biomass

Mishra¹,

Chandra²

2018

Asian J. Chem.

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INTRODUCTIONHeavy metals build up as metal-organic complexes in living organisms and eventually increase their concentration in biological cycles [1]. Issues related to metal contamination and management are common due to human activities and subsequent impact on the environment. Environmental contamination due to heavy metals accumulation from anthropogenic sources is one of the major areas of concern. Various industries viz., manufacturing, mining, power generating significantly contribute to water pollution through the generation of effluents containing higher concentrations of heavy metals. If left untreated, these contaminated effluents may pollute both surface and sub-surface water. Inadequate treatment of effluents from industries impacts both health and environment [2]. Their removal being a prerequisite, various physical, chemical and biological techniques have been brought forth. Several methods, like precipitation, coagulation/flocculation, chemical reduction, ion exchange, electrodialysis, reverse osmosis, filtration, etc.[3] are followed for the decontamination of wastewater. However, these methods cannot be always implemented due to capital investments and operating costs. Adsorption is a physical technique used for the removal of toxic metals [3] and known for its simple usage and availability of wide range of adsorbents. Adsorption plays a significant role in the effective removal of pollutants not only from the aqueous sources but also from In the present study, we have used neem (Azadirachta indica) leaf powder as a non-conventional biosorbent for the removal of Cd(II) from aqueous solutions. Batch experiments were conducted to identify equilibrium time, equilibrium adsorbent dosage and equilibrium metal concentration. The data were analyzed by applying Freundlich, Langmuir and Temkin isotherm models. The kinetics of adsorption was studied from the data obtained through pseudo-first-order and pseudo-second-order equations. The adsorption data best fitted for Freundlich isotherm and the process obeyed pseudo-second-order. The adsorption of Cd(II) was rapid initially and reached the peak at 180 min of agitation (96.9 %). The adsorbent dose indicated instantaneous adsorption (92.8 %) at 0.4 g and reached equilibrium at 1.6 g (97.4 %). The adsorption was rapid initially (99.6 %) at Cd(II) concentration of 60 mg L -1 and decreased (96.2 %) at 200 mg L -1 . It was revealed that neem leaf powder has effective potential for the removal of Cd(II) from aqueous solution. Removal of Cd(II) from Aqueous Solution Using Dried Plant (Azadirachta indica)

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Section: Resultsmentioning

confidence: 99%

Removal of Cd(II) from Aqueous Solution Using Dried Plant (Azadirachta indica) Biomass

Mishra¹,

Chandra²

2018

Asian J. Chem.

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“…Although [26] reported higher sorption of Cu than Zn in binary solution with equal concentrations of the two metals, competition with Zn at 20 times higher concentration, could have suppressed Cu sorption. Metal concentration play a significant role in the rate of adsorption [37]. The higher Zn and lower Cu and Cr sorption, in the multi-metal than single metal solutions, indicated that competitive sorption of the metals was affected by relative concentrations in the effluent, which favoured Zn sorption.…”

Section: Discussionmentioning

confidence: 99%

“…In the current study, the lower Cu sorption values in single metal solution than in multiple metal effluent, except for pine-bark, could be attributable to high Zn concentration and competition, which was higher than the other elements. Mishra et al [37] reported that adsorbent dosage and metal concentration play a significant role in the rate and quantity of adsorption [37]. Park et al [38] also reported lower values of Cu sorption in multi-metal (40.2 mg g −1 ) than single metal solutions (56.5 mg g −1 ) due to competitive sorption with co-existing metals [34] especially Zn.…”

Section: Discussionmentioning

confidence: 99%

Sorption of Selected Heavy Metals with Different Relative Concentrations in Industrial Effluent on Biochar from Human Faecal Products and Pine-Bark

Koetlisi

Muchaonyerwa

2019

Materials

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The removal of heavy metals from effluents at source could reduce contamination of soil and water bodies. A batch sorption experiment was performed to determine the effects of feedstock of biochars pyrolysed at increasing temperature on sorption capacities of Cu, Cr and Zn from industrial effluent and aqueous solutions. Sewage sludge, latrine faecal waste and pine-bark biochars were used. The sorption data were fitted to the Langmuir isotherm. Maximum sorption capacities of latrine waste, sewage sludge and pine-bark biochar (350 °C) were, respectively, 313, 400 and 233 mg kg−1 for Zn, 102, 98.0 and 33.3 mg kg−1 for Cu, and 18.9, 13.8 and 67.1 mg kg−1 for Cr from industrial effluent. Conversely, sorption capacities from single metal solutions were 278, 227 and 104 mg Zn kg−1, 97.1, 137 and 21.3 mg Cu kg−1, 122, 106 and 147 mg Cr kg−1 on latrine waste, sewage sludge and pine-bark biochar, respectively. Step-wise regression analysis showed that the combined effects of ash, fixed C, pH influenced Zn sorption, ash and fixed C affected Cu sorption, and Cr sorption by ash and specific surface area of the biochar. The findings of the study imply that biochar from human faecal waste, particularly sewage sludge, has the potential to be utilized as sorbents of heavy metals from multiple metal effluent and that the sorption is affected by relative concentrations.

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“…This was also supported by the closer calculated qe (3.0597 mg/g) of the PSO to the experimental qe (2.53 mg/g), than that presented by the PFO model (3.4883 mg/g). The best t presented by the PSO models suggests the involvement of electrostatic interactions between the BRB molecules in solution and ZnONP adsorbent in the dye removal process 77,78 . This implication corroborates our deduction from the FTIR analysis obtained after BRB adsorption onto ZnONP, which showed the involvement of electrostatic interactions.…”

Section: Kinetics and Thermodynamics Of Adsorptionmentioning

confidence: 98%

One-Pot Synthesis of Zinc Oxide Nanoparticle for Bromophenol Blue Adsorption and Its Antifungal Activity Against Filamentous Fungi

Akpomie¹,

Ghosh²,

Gryzenhout³

et al. 2020

Preprint

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Zinc oxide nanoparticles (ZnONP) have gained attention in recent years due to their multifunctional uses, potent adsorptive potential and effective antifungal activities. Despite these desirable characteristics, ZnONP has not been used for the adsorption of bromophenol blue (BRB) and tests as antifungal agents against certain important filamentous fungal strains have been limited. In this research, ZnONP was prepared via a facile one-pot synthetic approach and applied in the adsorption of BRB and as an antifungal agent against the filamentous fungi and plant pathogens; Alternaria alternata CGJM3078, Alternaria alternata CGJM3006 and Fusarium verticilliodes CGJM3823. The ZnONP was characterized by the UV, FTIR, XRD, TGA, BET, SEM, TEM, and EDX techniques, which showed efficient synthesis. The characteristics ZnO UV absorption band was observed at 375 nm, while the XRD showed an average ZnONP crystalline size of 47.2 nm. The SEM and TEM images showed an irregular shaped and aggregated porous structure of 65.3 nm average-sized ZnONPs. The Freundlich, pseudo-second-order, and intra-particle diffusion models showed R2 > 0.9494 and SSE < 0.7412, thus, exhibited the best fit to the isotherm and kinetics of adsorption. Adsorption thermodynamics revealed feasible, endothermic, random, and spontaneous adsorption of BRB onto the synthesized ZnONPs. The antifungal assay conducted, depicted strong antifungal activities against all three tested fungal cultures. A model was proposed on what causes this antifungal effect. This research demonstrated the potent use of ZnONP for the adsorption of BRB and as effective antifungal agents.

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Kinetics and isotherm studies for the adsorption of metal ions onto two soil types

Cited by 40 publications

References 67 publications

Removal of Cd(II) from Aqueous Solution Using Dried Plant (Azadirachta indica) Biomass

Removal of Cd(II) from Aqueous Solution Using Dried Plant (Azadirachta indica) Biomass

Sorption of Selected Heavy Metals with Different Relative Concentrations in Industrial Effluent on Biochar from Human Faecal Products and Pine-Bark

One-Pot Synthesis of Zinc Oxide Nanoparticle for Bromophenol Blue Adsorption and Its Antifungal Activity Against Filamentous Fungi

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