Surface engineering of nano-sorbents for the removal of heavy metals: Interfacial aspects

Pandey, Lalit M.

doi:10.1016/j.jece.2020.104586

Cited by 46 publications

(24 citation statements)

References 64 publications

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“…Also, Si was present only in the case of modified bagasse. This complemented the FTIR results and confirmed the successful formation of octyl SAMs on the bagasse surface. , …”

Section: Results and Discussionsupporting

confidence: 78%

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Hydrophobic Surface Induced Biosorption and Microbial Ex Situ Remediation of Oil-Contaminated Sites

Sharma

Pandey

2021

Ind. Eng. Chem. Res.

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Microbial bioremediation of spilled oil is the most sustainable and eco-friendly approach, yet the slower biodegradation rate remains a challenge for researchers. An integrated strategy of biodegradation along with a faster removal method like adsorption is one of the options available to address this challenge. In this study, we have explored the surface-induced biosorption coupled microbial biodegradation approach for effective remediation. Low-cost bagasse was used as a biosorbent and its surface hydrophobicity was improved by forming octyl self-assembled monolayers to enhance the surface-oil interactions (adsorption). Pseudomonas aeruginosa was exploited for biodegradation because of its known oil degradation and biosurfactant production abilities. An enhanced oil adsorption capacity of 6.9 ± 0.3 g/g was obtained after surface modification of the bagasse. The rate of adsorption was 2.5 fold higher as compared to unmodified bagasse. A kinetic model is proposed for the integrated process, which agreed to simultaneous biosorption and biodegradation. The microbial oil biodegradation rate was improved by 17 fold in the case of the integrated process. This integrated approach was found to synergistically improve the overall remediation of crude oil, which was also correlated with alkane hydroxylase activity and biosurfactant production. Preadsorbed oil on hydrophobic bagasse improved oil availability for the adhered microbes. Further, the synthesis of biosurfactant amended the biodegradation process. Hence, in the foreseeable future, hydrophobic biosorbents with excellent adsorption capacity, stability, and reusability shall be potential carriers for the bioremediation of contaminated sites.

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“…Also, Si was present only in the case of modified bagasse. This complemented the FTIR results and confirmed the successful formation of octyl SAMs on the bagasse surface. , …”

Section: Results and Discussionsupporting

confidence: 78%

“…The sugar cane bagasse was initially acid pretreated and further chemically modified using TEOS (1%, v/v) in ethanol under an inert atmosphere for the formation of octyl SAMs , as depicted in Scheme . The detailed biosorbent preparation is mentioned in the Supporting Information (section S1.1).…”

Section: Materials and Methodsmentioning

confidence: 99%

Hydrophobic Surface Induced Biosorption and Microbial Ex Situ Remediation of Oil-Contaminated Sites

Sharma

Pandey

2021

Ind. Eng. Chem. Res.

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“…For example, the fungus Fusarium oxysporum was reacted with aqueous anionic complex at room temperature to form silica [39,40]. Recently, various biomass have been investigated to synthesize silica nanoparticles, like rice husk, sugarcane bagasse and rice straw [14,[41][42][43][44]. Silica present in the biomass is initially isolated and formed into sodium silicate solution [45].…”

Section: Synthesis Of Snps (Biogenic Methods)mentioning

confidence: 99%

A Comprehensive Review of Synthesis, Applications and Future Prospects for Silica Nanoparticles (SNPs)

Akhter

Rao

Abbasi

et al. 2022

Silicon

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Silica nanoparticles (SNPs) have shown great applicability potential in a number of fields like chemical, biomedical, biotechnology, agriculture, environmental remediation and even wastewater purification. With remarkably instinctive properties like mesoporous structure, high surface area, tunable pore size/diameter, biocompatibility, modifiability and polymeric hybridizability, the SNPs are growing in their applicable potential even further. These particles are shown to be non-toxic in nature, hence safe to be used in biomedical research. Moreover, the molecular mobilizability onto the internal and external surface of the particles makes them excellent carriers for biotic and non-biotic compounds. In this respect, the present study comprehensively reviews the most important and recent applications of SNPs in a number of fields along with synthetic approaches. Moreover, despite versatile contributions, the applicable potential of SNPs is still a tip of the iceberg waiting to be exploited more, hence, the last section of the review presents the future prospects containing only few of the many gaps/research extensions regarding SNPs that need to be addressed in future work.

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“…A review of the literature reveals that studies describing the preparation of adsorbent materials for lead ion removal have emphasized adsorbent systems with a powder-like morphology (Beni and Esmaeili, 2020;Pandey, 2020;Shakoor et al, 2020;Boominathan and Sivaramakrishna, 2021;Shabtai et al, 2021). Despite the practical limitations of powdered adsorbents in column-based systems (Mohamed and Wilson, 2015;Patel, 2019), there are sparse reports that detail other types of adsorbent morphology for chitosan-based materials such as pelletized forms, as described herein (Syauqiah et al, 2015;Mohamed et al, 2017Mohamed et al, , 2020.…”

Section: Resultsmentioning

confidence: 99%

“…In the case of adsorption-based methods, the infrastructure and operating costs are relatively low, whereas the efficiency of contaminant removal often depends on the nature of the adsorbent material. While there are various industrial adsorbents (e.g., activated carbon and zeolites) for metal-ion removal, there is ongoing interest in the development of sustainable biosorbents due to their renewable abundance and utilization in composite materials (Bailey et al, 1999;Shareef, 2009;Zhou and Haynes, 2010;Mudhoo et al, 2012;Pandey, 2020;Shakoor et al, 2020;Shabtai et al, 2021). The use of biopolymers such as chitosan and its modified forms for metal-ion adsorption are widely reported.…”

Section: Introductionmentioning

confidence: 99%

Design of Sustainable Biomaterial Composite Adsorbents for Point-of-Use Removal of Lead Ions From Water

et al. 2022

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The uncontrolled release of contaminants into aquatic environments has created the need for improved adsorbent materials for point-of-use (POU) treatment applications to address water security. The goal of this study was to prepare a low-cost sustainable adsorbent material with tailored Pb(II) adsorption properties in aqueous media. Several types of ternary composite adsorbents were prepared that contain chitosan, kaolinite, and a biomass additive (oat hulls or torrefied wheat straw), along with spectral characterization and thermal analysis of the adsorbents. The adsorption properties of the ternary composites with lead nitrate were studied at equilibrium using batch mode and dynamic conditions with a fixed bed column under variable experimental settings [flow rate, bed height, and Pb(II) concentration]. The adsorption capacity at equilibrium in synthetic or tap water was found to depend on the relative composition (wt.%) of additive components in the composite. The optimal composite adsorbent for maximum Pb(II) removal had the following composition (wt.%): chitosan (50%) + kaolinite (10%) + oat hulls (40%). Using this adsorbent, the dynamic adsorption properties with lead nitrate were studied in a fixed bed column at pH 6.5 and 295 K to reveal optimized Pb(II) removal that concur with the results obtained from batch studies. The sustainability of the biocomposite adsorbent was demonstrated with the use of relatively low-cost and locally available materials, whilst achieving favorable Pb(II) adsorption properties. The facile preparation of the optimal biocomposite adsorbent herein is proposed for use as a disposable POU filter media technology for the removal of lead and other multivalent heavy metal cations, including organic contaminants such as cationic dyes and agrochemicals.

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Surface engineering of nano-sorbents for the removal of heavy metals: Interfacial aspects

Cited by 46 publications

References 64 publications

Hydrophobic Surface Induced Biosorption and Microbial Ex Situ Remediation of Oil-Contaminated Sites

Hydrophobic Surface Induced Biosorption and Microbial Ex Situ Remediation of Oil-Contaminated Sites

A Comprehensive Review of Synthesis, Applications and Future Prospects for Silica Nanoparticles (SNPs)

Design of Sustainable Biomaterial Composite Adsorbents for Point-of-Use Removal of Lead Ions From Water

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