Killing Two Birds with One Stone: Coating Ag NPs Embedded Filter Paper with Chitosan for Better and Durable Point-of-Use Water Disinfection

2018 ◽  
Vol 10 (44) ◽  
pp. 38239-38245 ◽  
Author(s):  
Meikun Fan ◽  
Lin Gong ◽  
Ji Sun ◽  
Dongmei Wang ◽  
Feng Bi ◽  
...  
Keyword(s):  
Filter Paper ◽  
Water Disinfection ◽  
Ag Nps ◽  
Point Of Use

scholarly journals Robust immobilization of anionic silver nanoparticles on cellulose filter paper toward a low-cost point-of-use water disinfection system with improved anti-biofouling properties

RSC Advances ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 4873-4882
Author(s):  
Gongyan Liu ◽  
Ruiquan Yu ◽  
Jing Jiang ◽  
Zhuang Ding ◽  
Jing Ma ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Filter Paper ◽  
Low Cost ◽  
Water Disinfection ◽  
Point Of Use ◽  
Cellulose Filter

Point-of-use water disinfection by GA@AgNPs-LA-FP.

Fabrication of Polypyrrole Nanowire Arrays-Modified Electrode for Point-of-Use Water Disinfection Via Low-Voltage Electroporation

2021 ◽  
pp. 117825
Author(s):  
Shuang-Yu Pi ◽  
Yang Wang ◽  
Ying-Wen Lu ◽  
Guang-Li Liu ◽  
Hai-Ming Wu ◽  
...  
Keyword(s):  
Modified Electrode ◽  
Low Voltage ◽  
Water Disinfection ◽  
Nanowire Arrays ◽  
Point Of Use

scholarly journals In vitro toxicity studies of novel solar water disinfection reactors using the E-screen bioassay and the Ames test

2021 ◽  
Author(s):  
Paloma Ozores Diez ◽  
M. Inmaculada Polo-López ◽  
Azahara Martínez-García ◽  
Monique Waso ◽  
Brandon Reyneke ◽  
...  
Keyword(s):  
Ames Test ◽  
Daily Intake ◽  
Cost Effective ◽  
Water Disinfection ◽  
In Vitro Toxicity ◽  
Toxic Substances ◽  
Solar Water ◽  
Point Of Use ◽  
Solar Water Disinfection

Abstract Solar water disinfection (SODIS) is a cost-effective point of use method for disinfecting water, usually in a 2 L polyethylene terephthalate (PET) plastic bottle. To increase the volume of water disinfected, three novel transparent reactors were developed using PET in 25 L transparent jerrycans, polymethyl methacrylate (PMMA) in tubular solar reactors capable of delivering >20 L of water and polypropylene (PP) in 20 L buckets. In vitro bioassays were used to investigate any toxic substances leached from the plastic reactors into disinfected water as a result of exposure to sunshine for up to 9 months. The Ames test was used to test for mutagenicity and the E-screen bioassay to test for estrogenicity. No mutagenicity was detected in any sample and no estrogenicity was found in the SODIS treated water produced by the PMMA reactors or the PP buckets. While water disinfected using the PET reactors showed no estrogenicity following exposure to the sun for 3 and 6 months, estrogenicity was detected following 9 months' exposure to sunlight; however levels detected were within the acceptable daily intake for 17β-estradiol (E2) of up to 50 ng/kg body weight/day.

scholarly journals A Non-electric and Affordable Surface Engineered Particle (SEP) based Point-of-Use (POU) Water Disinfection System

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Deepa Dixit ◽  
Virupakshi Soppina ◽  
Chinmay Ghoroi
Keyword(s):  
Developing Countries ◽  
Drinking Water ◽  
Low Income ◽  
Alkali Treatment ◽  
Health Hazard ◽  
Surface Hydrophobicity ◽  
Water Disinfection ◽  
Binding Property ◽  
Point Of Use ◽  
Gravity Driven

AbstractAccess to safe drinking water is still a distant dream to millions of people around the world. Especially, people from the low-income group in the developing countries remain deprived of this fundamental right and causes millions of death. There is an urgent need to develop affordable and easy to handle water filter which can provide desired drinking water quality without any electricity. In the present work, a simple and low-cost surface engineered particle (SEP) based filter is developed via alkali treatment of soda-lime-silica particle. The SEP based filter can be used as a portable, non-electric, gravity-driven Point-of-Use (POU) water disinfection system. The developed SEP-based filter is capable to arrest the 99.48% (~2 to 2.5 log10 reduction) of gram-negative bacteria Escherichia coli (E. coli OP50) on its surface from the water containing 3 × 108 cells/ml. No bacterial regrowth is observed in the purified water for 12 h. The performance of SEP bed filter is implicated to the nano-scale surface roughness, its distribution along with the surface charge and surface hydrophobicity which are favorable to attract and adhere the bacteria in the flowing water. The observation is consistent over multiple filtration cycles indicating the suitability of SEP based bed filter for POU water disinfection. The SEP surface with 0.05 mM Ag+ loading (SEP+) completely inactivated (>99.99999%) bacteria and protects any bacteria recontamination in the purified water for its long term usage. The strong and effective silver binding property of SEP surface enables very minimal silver loading and eliminates any health hazard due to low silver leaching (~50 ppb) which is well below the drinking water equivalent level (DWEL ≤ 100 ppb). In rural and urban slum areas of developing countries where no water purification system exists prior to consumption, the easy-to-implement and affordable SEP-based gravity-driven non-electric point-of-use water purifier (materials cost ~ 0.25 USD) can be used to protect millions of lives from water borne diseases.

Tannic acid-mediated rapid layer-by-layer deposited non-leaching silver nanoparticles hybridized cellulose membranes for point-of-use water disinfection

2020 ◽  
Vol 231 ◽  
pp. 115746 ◽  
Author(s):  
Zahid Hanif ◽  
Zeeshan Ahmad Khan ◽  
Mohd Farhan Siddiqui ◽  
Muhammad Zakria Tariq ◽  
Seungkyung Park ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Tannic Acid ◽  
Water Disinfection ◽  
Layer By Layer ◽  
Point Of Use ◽  
Cellulose Membranes

Hierarchically aligned nano silver/chitosan–PVA hydrogel for point-of-use water disinfection: contact-active mechanism revealed

2020 ◽  
Vol 7 (8) ◽  
pp. 2337-2350 ◽  
Author(s):  
Navneet Kaur Dhiman ◽  
Shekhar Agnihotri
Keyword(s):  
Water Disinfection ◽  
Nano Silver ◽  
Active Mechanism ◽  
Point Of Use ◽  
Pva Hydrogel

Mechanically robust Ag/CS–PVA hydrogel displayed 100% disinfection efficacy against biomedical/natural contaminants through contact-active mechanism with ∼74 ppb Ag release.

scholarly journals Assessment of a low-cost, point-of-use, ultraviolet water disinfection technology

2007 ◽  
Vol 6 (1) ◽  
pp. 53-65 ◽  
Author(s):  
Sarah A. Brownell ◽  
Alicia R. Chakrabarti ◽  
Forest M. Kaser ◽  
Lloyd G. Connelly ◽  
Rachel L. Peletz ◽  
...  
Keyword(s):  
Rural Communities ◽  
Residence Time ◽  
Low Cost ◽  
Plug Flow ◽  
Field Studies ◽  
Water Disinfection ◽  
Galvanized Steel ◽  
Hydraulic Residence Time ◽  
Biological Assays ◽  
Point Of Use

We describe a point-of-use (POU) ultraviolet (UV) disinfection technology, the UV Tube, which can be made with locally available resources around the world for under $50 US. Laboratory and field studies were conducted to characterize the UV Tube's performance when treating a flowrate of 5 L/min. Based on biological assays with MS2 coliphage, the UV Tube delivered an average fluence of 900±80 J/m2 (95% CI) in water with an absorption coefficient of 0.01 cm−1. The residence time distribution in the UV Tube was characterized as plug flow with dispersion (Peclet Number = 19.7) and a mean hydraulic residence time of 36 s. Undesirable compounds were leached or produced from UV Tubes constructed with unlined ABS, PVC, or a galvanized steel liner. Lining the PVC pipe with stainless steel, however, prevented production of regulated halogenated organics. A small field study in two rural communities in Baja California Sur demonstrated that the UV Tube reduced E. coli concentrations to less than 1/100 ml in 65 out of 70 samples. Based on these results, we conclude that the UV Tube is a promising technology for treating household drinking water at the point of use.

Rapid fabrication of self-assembled interfacial film decorated filter paper as an excellent surface-enhanced Raman scattering substrate

2014 ◽  
Vol 6 (24) ◽  
pp. 9547-9553 ◽  
Author(s):  
Wu-Li-Ji Hasi ◽  
Shuang Lin ◽  
Xiang Lin ◽  
Xiu-Tao Lou ◽  
Fang Yang ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Filter Paper ◽  
Surface Enhanced Raman Scattering ◽  
Sers Substrate ◽  
Ag Nps ◽  
Interfacial Film ◽  
Rapid Fabrication ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

The fabrication of this paper-based SERS substrate is facile and rapid (<10 min). The coverage rate of Ag NPs is relatively high.

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