Review on biopolymers and composites – Evolving material as adsorbents in removal of environmental pollutants

Yaashikaa, P.R.; Kumar, P. Senthil; Karishma, S.

doi:10.1016/j.envres.2022.113114

Cited by 112 publications

(37 citation statements)

References 156 publications

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“…Biopolymers, i.e., natural polymers produced by living organisms, are sustainable materials with low toxicity, abundant and available, whose structure contains functional groups with an affinity towards diverse pollutants. The properties of biopolymers and their composites have prompted a focus on water treatment applications, namely as adsorbents for water decontamination ( Nasrollahzadeh et al, 2021 ; Yaashikaa et al, 2022 ). One of the major issues with the adsorption-treatment process is the recovery of spent sorbents, which should be easy and cost-effective ( Baskar et al, 2022 ).…”

Section: Nanomaterials For Water Cleaning Nanotechnologiesmentioning

confidence: 99%

Colloidal nanomaterials for water quality improvement and monitoring

et al. 2022

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Water is the most important resource for all kind forms of live. It is a vital resource distributed unequally across different regions of the globe, with populations already living with water scarcity, a situation that is spreading due to the impact of climate change. The reversal of this tendency and the mitigation of its disastrous consequences is a global challenge posed to Humanity, with the scientific community assuming a major obligation for providing solutions based on scientific knowledge. This article reviews literature concerning the development of nanomaterials for water purification technologies, including collaborative scientific research carried out in our laboratory (nanoLAB@UA) framed by the general activities carried out at the CICECO-Aveiro Institute of Materials. Our research carried out in this specific context has been mainly focused on the synthesis and surface chemical modification of nanomaterials, typically of a colloidal nature, as well as on the evaluation of the relevant properties that arise from the envisaged applications of the materials. As such, the research reviewed here has been guided along three thematic lines: 1) magnetic nanosorbents for water treatment technologies, namely by using biocomposites and graphite-like nanoplatelets; 2) nanocomposites for photocatalysis (e.g., TiO2/Fe3O4 and POM supported graphene oxide photocatalysts; photoactive membranes) and 3) nanostructured substrates for contaminant detection using surface enhanced Raman scattering (SERS), namely polymers loaded with Ag/Au colloids and magneto-plasmonic nanostructures. This research is motivated by the firm believe that these nanomaterials have potential for contributing to the solution of environmental problems and, conversely, will not be part of the problem. Therefore, assessment of the impact of nanoengineered materials on eco-systems is important and research in this area has also been developed by collaborative projects involving experts in nanotoxicity. The above topics are reviewed here by presenting a brief conceptual framework together with illustrative case studies, in some cases with original research results, mainly focusing on the chemistry of the nanomaterials investigated for target applications. Finally, near-future developments in this research area are put in perspective, forecasting realistic solutions for the application of colloidal nanoparticles in water cleaning technologies.

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Section: Nanomaterials For Water Cleaning Nanotechnologiesmentioning

confidence: 99%

Colloidal nanomaterials for water quality improvement and monitoring

et al. 2022

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“…In addition to biochar-based materials, as mentioned before, there has been a significant interest in using natural organic materials for soil amendment, such as biopolymers (starch and lignin) (Pang et al 2019;Rashid et al 2021;Yaashikaa et al 2022). These materials might also have a considerable redox potential, which could be enhanced after modification (He et al 2019).…”

Section: Anthropogenic Carbon Sourcesmentioning

confidence: 99%

Redox-induced transformation of potentially toxic elements with organic carbon in soil

Tsang

2022

carbon res

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Soil organic carbon (SOC) is a crucial component that significantly affects the soil fertility, soil remediation, and carbon sequestration. Here, we review the redox-induced transformation of potentially toxic elements (PTEs) through the abiotic impact of SOC. The complex composition of SOC includes humus, pyrogenic carbon (e.g., biochar), dissolved organic matter, and anthropogenic carbon (e.g., compost), with varying concentrations and properties. The primary redox moieties on organic carbon are surface functionalities (e.g., phenol, quinone, and N/S-containing functional groups), environmentally persistent free radicals, and graphitic structures, and their contents are highly variable. Owing to these rich redox moieties, organic carbon can directly affect the reduction and oxidation of PTEs in the soil, such as Cr(VI) reduction and As(III) oxidation. In addition, the interactions between organic carbon and soil redox moieties (i.e., O2, Fe, and Mn minerals) cause the transformation of PTEs. The formation of reactive oxygen species, Fe(II), and Mn(III)/Mn(II) is the main contributor to the redox-induced transformation of PTEs, including Cr(VI) reduction and As(III)/Cr(III)/Tl(I) oxidation. We articulated both the positive and negative effects of organic carbon on the redox-induced transformation of PTEs, which could guide soil remediation efforts. Further scientific studies are necessary to better understand the potential transformations of PTEs by SOC, considering the complicated soil moieties, variable organic carbon composition, and both biotic and abiotic transformations of PTEs in the environment. Graphical Abstract

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“…Thus, biosorption is a physicochemical phenomenon that refers to the ability of the biosorbent to capture ions present in an aqueous solution. The biosorbent can be used in a pristine form or modified as a biocomposite [ 13 , 35 ]. Additionally, they can be used as dry or calcined matter (activated carbons).…”

Section: Fluoride Removal By Biosorptionmentioning

confidence: 99%

“…Other alternative treatments include cellulose extraction, which increases adsorption capacity, and material pyrolysis, which increases porosity and surface area. However, this involves higher costs due to energy and reagent consumption and eventual waste generation [ 29 , 35 , 36 , 53 , 67 ].…”

Section: Fluoride Removal By Biosorptionmentioning

confidence: 99%

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Lignocellulosic Biomass as Sorbent for Fluoride Removal in Drinking Water

et al. 2022

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Water supply to millions of people worldwide is of alarmingly poor quality. Supply sources are depleting, whereas demand is increasing. Health problems associated with water consumption exceeding 1.5 mg/L of fluoride are a severe concern for the World Health Organization (WHO). Therefore, it is urgent to research and develop new technologies and innovative materials to achieve partial fluoride reduction in water intended for human consumption. The new alternative technologies must be environmentally friendly and be able to remove fluoride at the lowest possible costs. So, the use of waste from lignocellulosic biomasses provides a promising alternative to commercially inorganic-based adsorbents—published studies present bioadsorbent materials competing with conventional inorganic-based adsorbents satisfactorily. However, it is still necessary to improve the modification methods to enhance the adsorption capacity and selectivity, as well as the reuse cycles of these bioadsorbents.

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Review on biopolymers and composites – Evolving material as adsorbents in removal of environmental pollutants

Cited by 112 publications

References 156 publications

Colloidal nanomaterials for water quality improvement and monitoring

Colloidal nanomaterials for water quality improvement and monitoring

Redox-induced transformation of potentially toxic elements with organic carbon in soil

Lignocellulosic Biomass as Sorbent for Fluoride Removal in Drinking Water

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