Surface modified polymer-magnetic-algae nanocomposite for the removal of chromium- equilibrium and mechanism studies

Sarojini, G.; Babu, S. Venkatesh; Rajamohan, N.; Kumar, Pramod; Rajasimman, M.

doi:10.1016/j.envres.2021.111626

Cited by 55 publications

(8 citation statements)

References 47 publications

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“…Adsorption on clays takes place through hydroxyl, oxygen and particles edge on the surface of clays and thus they are very useful in adsorption technology. PPy-clay based adsorbents have been studied yielding good results as already shown in Table 1 (Setshedi et al 2013;Ballav et al 2014aBallav et al , 2014bZhou et al 2018;Olad et al 2019;Sarojini et al 2021). Xu et al (2019b) prepared semi-spherical agglomerated as polypyrrole/ calcium rectorite exfoliated sheets (PPy/Ca-REC) composites for aqueous solution Cr(VI) ions adsorption, via in situ polymerization of pyrrole monomer.…”

Section: Polypyrrole Modified Clay and Mineralmentioning

confidence: 98%

Polypyrrole-based adsorbents for Cr(VI) ions remediation from aqueous solution: a review

Chigondo¹,

Nyamunda²,

Maposa³

et al. 2022

Water Science and Technology

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Anthropogenic activities are principally responsible for the manifestation of toxic and carcinogenic hexavalent chromium (Cr(VI)) triggering water pollution that threaten the environment and human health. The World Health Organisation (WHO) restricts Cr(VI) ions concentration to 0.1 and 0.05 mg/L in inland surface water and drinking water, respectively. The available technologies for Cr(VI) ions removal from water were highlighted with emphasis on adsorption technology. Furthermore, the characteristics of several polypyrrole-based adsorbents were scrutinized including amino containing compounds, biosorbents, graphene/graphene oxide, clay materials and many other additives with reported effective Cr(VI) ions uptake. This efficiency in Cr(VI) ions adsorption is attributed to enhanced redox properties, increased number of functional groups and well as synergistic behaviour of the materials making up the composite. The Langmuir isotherm best described the adsorption processes with maximum adsorption capacities ranging from 3.40–961.50 mg/g. The regeneration of Cr(VI) ions laden adsorbents was studied. Ion exchange, electrostatic attractions, complexation, chelation reactions with protonated sites and the reduction were the mechanisms of adsorption. Nevertheless, there are limited details on comprehensive adsorbent regeneration studies to prolong robustness in adsorption-desorption cycles and utilization of the Cr(VI) ions laden adsorbent in other areas of research to limit the threat of secondary pollution.

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Section: Polypyrrole Modified Clay and Mineralmentioning

confidence: 98%

Polypyrrole-based adsorbents for Cr(VI) ions remediation from aqueous solution: a review

Chigondo¹,

Nyamunda²,

Maposa³

et al. 2022

Water Science and Technology

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“…Meanwhile, exploring of the natural polymers for Cr(VI) removal is also the cost-saving method. According to the previous report, the application of biomaterials in heavy metal removal as adsorbents declined by 20% of the investment cost, 36% of the operation cost and 28% of the entire treatment cost matched with several conventional technologies [ 100 ]. The application of natural raw materials such as clay or polysaccharides can minimize the cost of production of polymeric composites with a high contaminant removal capacity [ 91 ].…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, these nano-sized metals based absorbents were also robust for Cr(VI) removal at relatively low Cr(VI) concentrations ( Table 1 ). Nano-sized metal oxides, such as thorium oxide [ 96 ], titanium oxide [ 97 ], zinc oxide [ 98 ], manganese oxide [ 99 ], and ferric oxide [ 100 ], have also been used for Cr(VI) removal due to their vast surface area, high capacity and selectivity. However, the treatment performances of these sole metal oxides are far from ideal.…”

Section: Polymers Used For Cr(vi) Removalmentioning

confidence: 99%

“…The adsorption of Cr(VI) is an endothermic reaction [ 100 ]. Increasing the reaction temperature can enhance the adsorption of Cr(VI), which can be explained by the following aspects.…”

Section: Factors Affecting Cr(vi) Removalmentioning

confidence: 99%

“…Secondly, increasing the temperature may decrease the viscosity of the solution to enhance the diffusion of Cr(VI) [ 50 ]. However, the high temperature could also result in the damage to active binding sites, weakening of binding forces, and a high cost of operation [ 100 ]. Thus, the adsorption of Cr(VI) typically operates at normal temperature.…”

Section: Factors Affecting Cr(vi) Removalmentioning

confidence: 99%

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Advances in Sorptive Removal of Hexavalent Chromium (Cr(VI)) in Aqueous Solutions Using Polymeric Materials

Yuan

Luo

et al. 2023

Polymers

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Sorptive removal of hexavalent chromium (Cr(VI)) bears the advantages of simple operation and easy construction. Customized polymeric materials are the attracting adsorbents due to their selectivity, chemical and mechanical stabilities. The mostly investigated polymeric materials for removing Cr(VI) were reviewed in this work. Assembling of robust functional groups, reduction of self-aggregation, and enhancement of stability and mechanical strength, were the general strategies to improve the performance of polymeric adsorbents. The maximum adsorption capacities of these polymers toward Cr(VI) fitted by Langmuir isotherm model ranged from 3.2 to 1185 mg/g. Mechanisms of complexation, chelation, reduction, electrostatic attraction, anion exchange, and hydrogen bonding were involved in the Cr(VI) removal. Influence factors on Cr(VI) removal were itemized. Polymeric adsorbents performed much better in the strong acidic pH range (e.g., pH 2.0) and at higher initial Cr(VI) concentrations. The adsorption of Cr(VI) was an endothermic reaction, and higher reaction temperature favored more robust adsorption. Anions inhibited the removal of Cr(VI) through competitive adsorption, while that was barely affected by cations. Factors that affected the regeneration of these adsorbents were summarized. To realize the goal of industrial application and environmental protection, removal of the Cr(VI) accompanied by its detoxication through reduction is highly encouraged. Moreover, development of adsorbents with strong regeneration ability and low cost, which are robust for removing Cr(VI) at trace levels and a wider pH range, should also be an eternally immutable subject in the future. Work done will be helpful for developing more robust polymeric adsorbents and for promoting the treatment of Cr(VI)-containing wastewater.

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Nanoparticles and Nanocomposites for Heavy Metals Removal

Sarojini,

Kannan,

Rajamohan

et al. 2023

Advances in Sustainability Science and Technology

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Surface modified polymer-magnetic-algae nanocomposite for the removal of chromium- equilibrium and mechanism studies

Cited by 55 publications

References 47 publications

Polypyrrole-based adsorbents for Cr(VI) ions remediation from aqueous solution: a review

Polypyrrole-based adsorbents for Cr(VI) ions remediation from aqueous solution: a review

Advances in Sorptive Removal of Hexavalent Chromium (Cr(VI)) in Aqueous Solutions Using Polymeric Materials

Nanoparticles and Nanocomposites for Heavy Metals Removal

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