Polyvinyl alcohol/polysaccharide hydrogel graft materials for arsenic and heavy metal removal

2015 ◽  
Vol 39 (7) ◽  
pp. 5823-5832 ◽  
Author(s):  
Md. Najmul Kabir Chowdhury ◽  
Ahmad Fauzi Ismail ◽  
Mohammad Dalour Hossen Beg ◽  
Gurumurthy Hegde ◽  
Rasool Jamshidi Gohari
Keyword(s):  
Heavy Metal ◽  
Water Treatment ◽  
Polyvinyl Alcohol ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Hydrogel Formation ◽  
Polysaccharide Hydrogel ◽  
Metallic Species

Polyvinyl alcohol/polysaccharide hydrogel formation ((A)–(C)) and metallic species adsorption ((D)) for water treatment.

Divalent Heavy Metal Removal Using Manganese Oxide Coated Polymeric Media for Storm Water Treatment

2001 ◽  
Vol 2001 (14) ◽  
pp. 29-55 ◽  
Author(s):  
Dingfang Liu ◽  
John J. Sansalone ◽  
Frank K. Cartledge ◽  
Jonathan Kolich
Keyword(s):  
Heavy Metal ◽  
Water Treatment ◽  
Manganese Oxide ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Storm Water ◽  
Polymeric Media

scholarly journals Synthesis and Water Treatment Applications of Nanofibers by Electrospinning

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1779
Author(s):  
Saumya Agrawal ◽  
Rashmi Ranjan ◽  
Bajrang Lal ◽  
Ashiqur Rahman ◽  
Swatantra P. Singh ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Water Treatment ◽  
Environmental Remediation ◽  
Electrode Materials ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Membrane Distillation ◽  
Electrospinning Process

In the past few decades, the role of nanotechnology has expanded into environmental remediation applications. In this regard, nanofibers have been reported for various applications in water treatment and air filtration. Nanofibers are fibers of polymeric origin with diameters in the nanometer to submicron range. Electrospinning has been the most widely used method to synthesize nanofibers with tunable properties such as high specific surface area, uniform pore size, and controlled hydrophobicity. These properties of nanofibers make them highly sought after as adsorbents, photocatalysts, electrode materials, and membranes. In this review article, a basic description of the electrospinning process is presented. Subsequently, the role of different operating parameters in the electrospinning process and precursor polymeric solution is reviewed with respect to their influence on nanofiber properties. Three key areas of nanofiber application for water treatment (desalination, heavy-metal removal, and contaminant of emerging concern (CEC) remediation) are explored. The latest research in these areas is critically reviewed. Nanofibers have shown promising results in the case of membrane distillation, reverse osmosis, and forward osmosis applications. For heavy-metal removal, nanofibers have been able to remove trace heavy metals due to the convenient incorporation of specific functional groups that show a high affinity for the target heavy metals. In the case of CECs, nanofibers have been utilized not only as adsorbents but also as materials to localize and immobilize the trace contaminants, making further degradation by photocatalytic and electrochemical processes more efficient. The key issues with nanofiber application in water treatment include the lack of studies that explore the role of the background water matrix in impacting the contaminant removal performance, regeneration, and recyclability of nanofibers. Furthermore, the end-of-life disposal of nanofibers needs to be explored. The availability of more such studies will facilitate the adoption of nanofibers for water treatment applications.

Heavy metal removal by different water treatment plants, in Rio de Janeiro state, Brazil

1988 ◽  
Vol 9 (5) ◽  
pp. 429-436 ◽  
Author(s):  
José Mauricio P. Azcue ◽  
Wolfgang C. Pfeiffer ◽  
Marlene Fiszman ◽  
Olaf Malm
Keyword(s):  
Heavy Metal ◽  
Water Treatment ◽  
Rio De Janeiro ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Water Treatment Plants ◽  
Janeiro State

scholarly journals Health Risk Assessment of Heavy Metal Accumulation in Broiler Chickens and Heavy Metal Removal in Drinking Water using Moringa Oleifera Seeds in Lomé, Togo

2021 ◽  
Vol 11 (31) ◽  
Author(s):  
Idrissa Soumaoro ◽  
Wéré Pitala ◽  
Kissao Gnandi ◽  
Tona Kokou
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Drinking Water ◽  
Water Treatment ◽  
Moringa Oleifera ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Drinking Water Treatment ◽  
Poultry Meat ◽  
Well Water

Background. Heavy metals are persistent in the environment and can cause bioaccumulation in the food chain. Drinking water contamination by heavy metals can pose a risk to poultry and to human health. The need for affordable, reliable and effective methods of water treatment has led to the use of plants materials, including coagulants such as Moringa oleifera seeds, to ensure poultry products are safe for consumers. Objectives. The aim of the present study was to investigate the effects of drinking water treatment by Moringa oleifera seed on the concentration and distribution of metals such as arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu), nickel (Ni), lead (Pb) in different parts of broilers chickens and theirs effects on consumer health. Methods. A total number of 264 one-day old chickens (Cobb-500) were assigned to three treatments, with 22 birds in each treatment and replicated four times: untreated well water (UW), well water treated with Moringa oleifera seeds and filtered (MOF) and well water treated with Moringa oleifera seeds but unfiltered (MOU). Thirty birds were randomly chosen from different treatments and slaughtered at day 45 of the experiment and samples of livers, kidneys, gizzards and breasts were obtained and analyzed for toxic metals concentrations using atomic absorption spectrophotometry. Results. The results indicated that the bioaccumulation of heavy metals was lower in MOF than those in UW and MOU. The target hazard quotient (THQ) for individual metals was below acceptable limits except for As and Pb in UW and MOU. The carcinogenic risk (TR) was estimated for each metal due to consumption of different types of chicken. Conclusions. Moringa oleifera seeds are an environmentally friendly natural coagulant and able to treat water containing undesirable heavy metal concentrations and ensure that poultry meat is safe for consumers. Competing Interests. The authors declare no competing financial interests. Ethics Approval. This study was approved by the ethics Committee of the University of Lomé-Togo.

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