Limitations of Conventional Drinking Water Technologies in Pollutant Removal

Hofman‐Caris, Roberta; Hofman, Johannes

doi:10.1007/698_2017_83

Cited by 11 publications

(11 citation statements)

References 41 publications

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“…Many efforts have thus been directed toward the removal of organic and inorganic contaminants from water. However, the available traditional water-treatment methods and technologies carry certain limitations including their inability to completely remove certain contaminants to concentration levels that are safe for human consumption and the lack of versatility toward the removal of different classes of contaminants. , There is, thus, a need for the development of novel multifunctional materials with improved properties and a wider applicability for the efficient removal of a broad range of pollutants from water. In this context, the use of nanomaterials for improved contaminant removal by adsorption and/or (photo)catalytic reactions has been widely advocated, thanks to the their unique electronic, surface, and structural properties. , …”

Section: Introductionmentioning

confidence: 99%

Bacterial Nanocellulose/MoS₂ Hybrid Aerogels as Bifunctional Adsorbent/Photocatalyst Membranes for in-Flow Water Decontamination

Ferreira-Neto

Ullah

Silva

et al. 2020

ACS Appl. Mater. Interfaces

104

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To address the problems associated with the use of unsupported nanomaterials, in general, and molybdenum disulfide (MoS 2 ), in particular, we report the preparation of self-supported hybrid aerogel membranes that combine the mechanical stability and excellent textural properties of bacterial nanocellulose (BC)-based organic macro/ mesoporous scaffolds with the excellent adsorption-cum-photocatalytic properties and high contaminant removal performance of MoS 2 nanostructures. A controlled hydrothermal growth and precise tuning of the synthetic parameters allowed us to obtain BC/MoS 2 -based porous, self-supported, and stable hybrid aerogels with a unique morphology resulting from a molecular precision in the coating of quantum-confined photocatalytic MoS 2 nanostructures (2−4 nm crystallite size) on BC nanofibrils. These BC/MoS 2 samples exhibit high surface area (97−137 m 2 •g −1 ) and pore volume (0.28−0.36 cm 3 •g −1 ) and controlled interlayer distances (0.62−1.05 nm) in the MoS 2 nanostructures. Modification of BC with nanostructured MoS 2 led to an enhanced pollutants removal efficiency of the hybrid aerogels both by adsorptive and photocatalytic mechanisms, as indicated by a detailed study using a specifically designed membrane photoreactor containing the developed photoactive/adsorptive BC/MoS 2 hybrid membranes. Most importantly, the prepared BC/MoS 2 aerogel membranes showed high performance in the photoassisted in-flow removal of both organic dye (methylene blue (MB)) molecules (96% removal within 120 min, K obs = 0.0267 min −1 ) and heavy metal ions (88% Cr(VI) removal within 120 min, K obs = 0.0012 min −1 ), separately and/or simultaneously, under UV−visible light illumination as well as excellent recyclability and photostability. Samples with interlayer expanded MoS 2 nanostructures were particularly more efficient in the removal of smaller species (CrO 4 2− ) as compared to larger (MB) dye molecules. The prepared hybrid aerogel membranes show promising behavior for application in in-flow water purification, representing a significant advancement in the use of selfsupported aerogel membranes for photocatalytic applications in liquid media.

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Section: Introductionmentioning

confidence: 99%

Bacterial Nanocellulose/MoS₂ Hybrid Aerogels as Bifunctional Adsorbent/Photocatalyst Membranes for in-Flow Water Decontamination

Ferreira-Neto

Ullah

Silva

et al. 2020

ACS Appl. Mater. Interfaces

104

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“…In practice, contaminants entering water treatment/reuse plants (WTPs) are combined conventional and emerging contaminants. Major contaminants comprise NOM and emerging contaminants (Hofman‐Caris & Hofman, 2017; Levchuk et al, 2018; Taheran et al, 2018). Conventional water treatment units include coagulation/flocculation and filtration for removing suspended solids and disinfection.…”

Section: Applications Of Bac In Water Treatment and Reuse Systemsmentioning

confidence: 99%

“…To meet the demand, water utilities may have no option and need to produce drinking water from highly contaminated water sources or even treated wastewater. Depth filtration or granular filtration is a main process for water treatment systems throughout the world, and it has been applied to separate conventional suspended particles in water for thousand years (Crittenden et al, 2012;Hofman-Caris & Hofman, 2017). Apart from filtering by the media, biological process can be used to enhance the contaminant removal efficiency of the depth filtration.…”

Section: Introductionmentioning

confidence: 99%

“…Applications of BAC filtration for water treatment and potable water reuse have gained more and more attention because of its simplicity, affordability, effectiveness, adaptability to various feed water qualities, and the capability to remove both conventional and emerging contaminants (Gerrity et al, 2013; Hofman‐Caris & Hofman, 2017; Ross et al, 2019; Zhang et al, 2017). Conventional contaminants are such as natural organic matter (NOM) and metals while emerging contaminants are naturally or synthetically generated by human and industrial activities which cannot be effectively removed by conventional water treatment methods (Richardson & Ternes, 2017; Sophia & Lima, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Biofiltration for treatment of recent emerging contaminants in water: Current and future perspectives

Thuptimdang

Siripattanakul‐Ratpukdi

Ratpukdi

et al. 2020

Water Environment Research

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This review article discusses the current state of knowledge on water treatment and reuse by biofiltration systems focusing on biologically enhanced activated carbon (BAC) process. First, the applications of BAC in water treatment systems are overviewed, and then, the mechanisms for both biofilm formation and contaminant treatment are discussed along with the operational parameters influencing the performance of BAC process. Since contaminant removal by BAC is governed by adsorption and biodegradation, both processes are reviewed in relation to the treatment mechanisms. Information on removal of recent emerging contaminants including nitrogenous and unregulated disinfection by-products (DBPs) and their precursors, poly-and perfluorofluoroalkyl substances, nanoparticles, and plasticizers and microplastics by BAC is given along with suggestions for treatment improvements and future research. The uniqueness of this review includes insights on relevant biofilm aspects and the coverage on the abilities of BAC for treatment of recent and less common emerging contaminants especially unregulated DBPs and their precursors, nanoparticles, and plasticizers and microplastics. For future BAC studies, recommendations are proposed on exploring the biofilm development on media and recent emerging contaminants as co-contaminants, as well as developing novel supporting materials such as biochar. © 2020 Water Environment Federation • Practitioner points• The amount and the physiology and physical structure of biofilm affect the treatment efficiency of biological activated carbon. • Biological activated carbon is capable of removing a majority of nitrogenous and unregulated disinfection by-products. • Whether and how biological activated carbon is impacted by and/or can remove nanoparticles, and plasticizers and microplastics remain largely unknown. • Future work on biological activated carbon should focus on biofilm evolution and control, and novel support materials.

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“…To prepare them, methods such as aqueous dispersion polymerization , surfactant‐free emulsion polymerization , and heterophase polymerization , have been developed which can produce various interesting morphologies, such as conventional core‐shell , and raspberry‐like , currant‐bun‐like , and snowman‐like structures.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of raspberry‐ and confetti‐like hybrid poly(styrene‐co‐2‐vinyl pyrrolidone)/silica nanocomposite particles via alcoholic dispersion polymerization

2017

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Organic/inorganic hybrid particles with various morphologies play a critical role in the development of advanced materials. In this work, the synthesis of raspberry‐like hybrid poly(styrene‐co‐2‐vinyl pyrrolidone)/nanosilica via dispersion polymerization have been reported, 2‐vinylpyridine involved added to improve the interaction of polymer and nanoparticles. The most important parameters affecting the reaction such as comonomer, cosurfactant cetyltrimethylammonium bromide (CTAB), and initiator concentrations, reactions media, temperature, pH, and silica preparation method have been explored in great details. Thus micrometer‐sized nanosilica‐stabilized latex particles were successfully produced in alcoholic media in the presence of an alcoholic silica sol as the sole stabilizing agent. Raspberry‐like nanoparticles synthesized using both methanol and isopropanol as dispersion media, and 2,2‐azobisisobutyronitrile as initiator, and an operational window for the established process. Moreover for the first time, confetti‐like hybrid polymer/nanosilica particles synthesized use minor amounts of CTAB in methanol, and isopropanol based media. These particles contain potential applications in drug delivery and medical uses, and in the preparation of various polymer nanocomposites as well. POLYM. COMPOS., 39:3363–3376, 2018. © 2017 Society of Plastics Engineers

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Limitations of Conventional Drinking Water Technologies in Pollutant Removal

Cited by 11 publications

References 41 publications

Bacterial Nanocellulose/MoS₂ Hybrid Aerogels as Bifunctional Adsorbent/Photocatalyst Membranes for in-Flow Water Decontamination

Bacterial Nanocellulose/MoS₂ Hybrid Aerogels as Bifunctional Adsorbent/Photocatalyst Membranes for in-Flow Water Decontamination

Biofiltration for treatment of recent emerging contaminants in water: Current and future perspectives

Synthesis of raspberry‐ and confetti‐like hybrid poly(styrene‐co‐2‐vinyl pyrrolidone)/silica nanocomposite particles via alcoholic dispersion polymerization

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Limitations of Conventional Drinking Water Technologies in Pollutant Removal

Cited by 11 publications

References 41 publications

Bacterial Nanocellulose/MoS2 Hybrid Aerogels as Bifunctional Adsorbent/Photocatalyst Membranes for in-Flow Water Decontamination

Bacterial Nanocellulose/MoS2 Hybrid Aerogels as Bifunctional Adsorbent/Photocatalyst Membranes for in-Flow Water Decontamination

Biofiltration for treatment of recent emerging contaminants in water: Current and future perspectives

Synthesis of raspberry‐ and confetti‐like hybrid poly(styrene‐co‐2‐vinyl pyrrolidone)/silica nanocomposite particles via alcoholic dispersion polymerization

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Product

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Bacterial Nanocellulose/MoS₂ Hybrid Aerogels as Bifunctional Adsorbent/Photocatalyst Membranes for in-Flow Water Decontamination

Bacterial Nanocellulose/MoS₂ Hybrid Aerogels as Bifunctional Adsorbent/Photocatalyst Membranes for in-Flow Water Decontamination