Functionalization of MXene-based nanomaterials for the treatment of micropollutants in aquatic system: A review

Viswanathan, Karthik; Padmanaban, V. C.; Kumar, P. Senthil; Venkatachalam, Jeyamanikandan; Periyasamy, Selvakumar; Saravanan, R.

doi:10.1016/j.envpol.2022.119034

Cited by 34 publications

(15 citation statements)

References 103 publications

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“…Photocatalytic and adsorbent NMs have distinctive structural properties that permit the hierarchical design of nanohybrids to accomplish desirable synergistic outcomes. This enables the addition of new functional groups to the NM, hypothesized to improve MP/NP removal efficiency due to performance enhancement . Furthermore, specific ligands may be introduced onto the nanocomposite surface resulting in a novel selective binding of the target pollutant due to the newly reactive nanocomposite surface generated …”

Section: Types Of Nms With Mp Removal Potential From Different Water ...mentioning

confidence: 99%

“…This enables the addition of new functional groups to the NM, hypothesized to improve MP/NP removal efficiency due to performance enhancement. 31 Furthermore, specific ligands may be introduced onto the nanocomposite surface resulting in a novel selective binding of the target pollutant due to the newly reactive nanocomposite surface generated. 32 The studies referenced are mostly laboratory scale (smallscale) studies, so extrapolating reduction efficiencies to fullscale is difficult.…”

Section: From Different Water Bodiesmentioning

confidence: 99%

See 1 more Smart Citation

Nanomaterials for Microplastic Removal from Wastewater: Current State of the Art Nanomaterials and Future Prospects

Indhur,

Amoah,

Bux

et al. 2023

ACS EST Water

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Microplastics (MPs) and nanoplastics (NPs) infiltrate aquatic environments at an alarming rate, posing a serious threat to aquatic ecosystems and human health. Wastewater treatment plants are significant sources of MPs/NPs contamination in the aquatic environment, since they are inadequate at removing these MPs/NPs. This calls for the development and application of new technologies for MPs/NPs removal. Recent studies have demonstrated that nanomaterials (NMs) are effective in the removal of MPs from wastewater. This review examines MPs/NPs removal from wastewater using NMs. Despite a specific synthesis of NMs adapted for MP removal from water bodies not being clearly defined, the review assesses the current state of knowledge in relation to MPs/NPs removal from wastewater using NMs and the effect of water characteristics on the removal mechanism. Additionally, various insights into NM development based on specific interactions are addressed and linked to their suitability for wastewater treatment. There is currently considerable interest in chemically synthesizing NMs for the removal of MPs from wastewater. However, further developments are needed in the areas of physical and green synthesis of NMs for the removal of MPs. This review provides a baseline for future research and development of NMs for removing MPs from wastewater.

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Section: Types Of Nms With Mp Removal Potential From Different Water ...mentioning

confidence: 99%

Section: From Different Water Bodiesmentioning

confidence: 99%

Nanomaterials for Microplastic Removal from Wastewater: Current State of the Art Nanomaterials and Future Prospects

Indhur,

Amoah,

Bux

et al. 2023

ACS EST Water

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“…MXene-based sensors are successfully used for detection of heavy metal ions, pesticides, and phenols, among other compounds. [ 118 , 119 , 120 ].…”

Section: Environmental Applicationsmentioning

confidence: 99%

Synthesis, Toxicity Assessment, Environmental and Biomedical Applications of MXenes: A Review

et al. 2022

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MXenes are a family of two-dimensional (2D) composite materials based on transition metal carbides, nitrides and carbonitrides that have been attracting attention since 2011. Combination of electrical and mechanical properties with hydrophilicity makes them promising materials for biomedical applications. This review briefly discusses methods for the synthesis of MXenes, their potential applications in medicine, ranging from sensors and antibacterial agents to targeted drug delivery, cancer photo/chemotherapy, tissue engineering, bioimaging, and environmental applications such as sensors and adsorbents. We focus on in vitro and in vivo toxicity and possible mechanisms. We discuss the toxicity analogies of MXenes and other 2D materials such as graphene, mentioning the greater biocompatibility of MXenes. We identify existing barriers that hinder the formation of objective knowledge about the toxicity of MXenes. The most important of these barriers are the differences in the methods of synthesis of MXenes, their composition and structure, including the level of oxidation, the number of layers and flake size; functionalization, test concentrations, duration of exposure, and individual characteristics of biological test objects Finally, we discuss key areas for further research that need to involve new methods of nanotoxicology, including predictive computational methods. Such studies will bring closer the prospect of widespread industrial production and safe use of MXene-based products.

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“…For effective pesticide removal from water and wastewater, advanced treatment methods, such as adsorption, ion exchange, membrane filtration, advanced oxidation processes, and their hybrid combinations are recommended. − Adsorption is considered a promising process for pesticide removal, since it is well-known, low-cost, and very effective. Several natural and commercial adsorbents are available as well as modified and functionalized adsorbents have been developed for removing toxic and micropollutants, including pesticides. − Still, powdered activated carbon (PAC) remains the widely used adsorbent for pesticide removal because it is low-cost and easily available, it can be added when needed, its dosage can be adjusted easily according to pollutant concentration changes, it does not require a separate reactor, and it can be removed by precipitation or filtration processes after its use …”

Section: Introductionmentioning

confidence: 99%

Impact of Natural Organic Matter Competition on the Adsorptive Removal of Acetochlor and Metolachlor from Low-Specific UV Absorbance Surface Waters

Yilmaz,

Altiparmak,

Dadaser-Celik

et al. 2023

ACS Omega

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Although activated carbon adsorption is a very promising process for the removal of organic compounds from surface waters, the removal performance for nonionic pesticides could be adversely affected by co-occurring natural organic matter. Natural organic matter can compete with pesticides during the adsorption process, and the size of natural organic matter affects the removal of pesticides, as low-molecular-weight organics directly compete for adsorbent sites with pesticides. This study aims to investigate the competitive impact of low-molecular-weight organics on the adsorptive removal of acetochlor and metolachlor by four commercial powdered activated carbons. The adsorption features of selected powdered activated carbons were evaluated in surface water samples collected from the influent stream of the filtration process having 2.75 mg/L organic matter and 0.87 L/mg-m specific UV absorbance. The adsorption kinetics and capacities were examined by employing pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetic models and modified Freundlich and Langmuir isotherm models to the experimental data. The competitive removal of acetochlor and metolachlor in the presence of natural organic matter was evaluated for varied powdered activated carbon dosages on the basis of UV and specific UV absorbance values of adsorbed organic matter. The adsorption data were well represented by the modified Freundlich isotherm, as well as pseudo-second-order kinetics. The maximum organic matter adsorption capacities of the modified Freundlich isotherm were observed to be 120.6 and 127.2 mg/g by Norit SX Ultra and 99.5 and 100.6 mg/g by AC Puriss for acetochlor-and metolachlorcontaining water samples, respectively. Among the four powdered activated carbons, Norit SX Ultra and AC Puriss provided the highest natural organic matter removal performances with 76 and 72% and 71 and 65% for acetochlor-and metolachlor-containing samples, respectively. Similarly, Norit SX Ultra and AC Puriss were very effective for adsorbing aromatic organics with higher than 80% specific UV absorbance removal efficiency. Metolachlor was almost completely removed by higher than 98% by Norit SX Ultra, Norit SX F Cat, and AC Puriss, even at low adsorbent dosages. However, an adsorbent dose of 100 mg/L and above should be added for all powdered activated carbons, except for Norit SX F Cat, for achieving an acetochlor removal performance of higher than 98%. The competition between low-molecular-weight organics (low-specific UV absorbance) and acetochlor and metolachlor was more apparent at low adsorbent dosages (10−75 mg/L).

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Functionalization of MXene-based nanomaterials for the treatment of micropollutants in aquatic system: A review

Cited by 34 publications

References 103 publications

Nanomaterials for Microplastic Removal from Wastewater: Current State of the Art Nanomaterials and Future Prospects

Nanomaterials for Microplastic Removal from Wastewater: Current State of the Art Nanomaterials and Future Prospects

Synthesis, Toxicity Assessment, Environmental and Biomedical Applications of MXenes: A Review

Impact of Natural Organic Matter Competition on the Adsorptive Removal of Acetochlor and Metolachlor from Low-Specific UV Absorbance Surface Waters

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