scholarly journals Cyanobacterial Extracellular Polymeric Substances for Heavy Metal Removal: A Mini Review

2020 ◽  
Vol 5 (1) ◽  
pp. 1
Author(s):  
Ajit Pratap Singh Yadav ◽  
Vinay Dwivedi ◽  
Satyendra Kumar ◽  
Anamika Kushwaha ◽  
Lalit Goswami ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Extracellular Polymeric Substances ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Lethal Effect ◽  
Aqueous System ◽  
Anthropogenic Sources ◽  
Cyanobacterial Species ◽  
High Concentrations

Heavy metals from various natural and anthropogenic sources are becoming a chief threat to the aquatic system owing to their toxic and lethal effect. The treatment of such contaminated wastewater is one of the prime concerns in this field. For decades, a huge array of innovative biosorbents is used for heavy metal removal. Though extensive microbes and their biomolecules have been experimented and have showed great potential but most of them have failed to have the substantial breakthrough for the practical application. The present review emphasis on the potential utilization of the cyanobacteria for the heavy metal removal along with the toxic effect imposed by the pollutant. Furthermore, the effect of significant parameters, plausible mechanistic insights of the heavy metal toxicity imposed onto the cyanobacteria is also discussed in detail. The role of extrapolymeric substances and metallothionein secreted by the microbes are also elaborated. The review was evident that the cyanobacterial species have a huge potential towards the heavy metal removal from the aqueous system ranging from very low to very high concentrations.

scholarly journals Aquatic Mosses as Adaptable Bio-Filters for Heavy Metal Removal from Contaminated Water

2020 ◽  
Vol 21 (13) ◽  
pp. 4769
Author(s):  
Paride Papadia ◽  
Fabrizio Barozzi ◽  
Danilo Migoni ◽  
Makarena Rojas ◽  
Francesco P. Fanizzi ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Significant Proportion ◽  
Pollutant Removal ◽  
Polluted Water ◽  
Aquatic Moss ◽  
Aquatic Mosses ◽  
High Concentrations ◽  
Short Time

Heavy metals (HMs) are released into the environment by many human activities and persist in water even after remediation. The efficient filtration of solubilized HMs is extremely difficult. Phytoremediation appears a convenient tool to remove HMs from polluted water, but it is limited by the choice of plants able to adapt to filtration of polluted water in terms of space and physiological needs. Biomasses are often preferred. Aquatic moss biomasses, thanks to gametophyte characteristics, can act as live filtering material. The potential for phytoremediation of Hypnales aquatic mosses has been poorly investigated compared to aquatic macrophytes. Their potential is usually indicated as a tool for bioindication and environmental monitoring more than for pollutant removal. When phytoremediation has been considered, insufficient attention has been paid to the adaptability of biomasses to different needs. In this study the heavy metal uptake of moss Taxiphyllum barbieri grown in two different light conditions, was tested with high concentrations of elements such as Pb, Cd, Zn, Cu, As, and Cr. This moss produces dense mats with few culture needs. The experimental design confirmed the capacity of the moss to accumulate HMs accordingly to their physiology and then demonstrated that a significant proportion of HMs was accumulated within a few hours. In addition to the biosorption effect, an evident contribution of the active simplistic mass can be evidenced. These reports of HM accumulation within short time intervals, show how this moss is particularly suitable as an adaptable bio-filter, representing a new opportunity for water eco-sustainable remediation.

scholarly journals Role of fly ash in heavy metal removal from flue gas. Final report, September 1, 1993--August 31, 1994

10.2172/67253 ◽  
1995 ◽  
Author(s):  
F. Bavarian ◽  
S. Mahuli ◽  
A. Ghosh-Dastidar ◽  
R. Agnihotri ◽  
L.S. Fan
Keyword(s):  
Heavy Metal ◽  
Fly Ash ◽  
Flue Gas ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Final Report

Low Cost Absorbents, Techniques, and Heavy Metal Removal Efficiency

2018 ◽  
pp. 50-79
Author(s):  
Harendra Kumar Sharma ◽  
Irfan Rashid Sofi ◽  
Khursheed Ahmad Wani
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Heavy Metal Contamination ◽  
Metal Removal ◽  
Low Cost ◽  
Heavy Metal Removal ◽  
Future Research ◽  
Removal Of Heavy Metals ◽  
Living Species ◽  
High Concentrations

Heavy metal contamination in water is a serious concern to the environment and human health. High concentrations of heavy metals in the environment can be toxic to a variety of living species. Natural bio-absorbents are abundant and inexpensive and considered a waste if not managed properly. The role of bio-absorbents has been widely studied and has been utilized for the removal of heavy metals. The objective of the chapter is to search the database for different absorbents and their efficiency for the removal of heavy metals. Key words related to the study have been used to select different papers published by the researchers all over the world. A rigorous three-tier process has been utilized by the authors to select the papers from the database for the current study. This chapter has identified a few research gaps in the field of heavy metal removal by using different low cast absorbents that need to be taken into account in future research.

scholarly journals Role of fly ash in heavy metal removal from flue gas. Final report, September 1, 1994--February 29, 1996

1996 ◽  
Author(s):  
F. Bavarian ◽  
S. Mahuli ◽  
A. Ghosh-Dastidar ◽  
R. Agnihotri ◽  
Liang-Shih Fan
Keyword(s):  
Heavy Metal ◽  
Fly Ash ◽  
Flue Gas ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Final Report

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.

scholarly journals Role of Phytoremediation in Reducing Cadmium Toxicity in Soil and Water

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Pooja Mahajan ◽  
Jyotsna Kaushal
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Cadmium Toxicity ◽  
Heavy Metal Removal ◽  
Cost Effective ◽  
Cost Effective Approach ◽  
Hyperaccumulating Plant ◽  
Cd Removal ◽  
Soil And Water

Heavy metals are a noxious form of pollutants present in soil and water. A new plant-based solar energy driven technology, phytoremediation, emerges as eco-friendly and cost-effective approach to remove heavy metal from various media with the help of hyperaccumulating plant species. This review paper aims to provide information on phytoremediation and its mechanisms for heavy metal removal especially to focus on Cadmium (Cd) metal and highlights the role of various hyperaccumulating plants for Cd metal remediation in soil and water. It complies various field case studies which play the important role in understanding the Cd removal through various plants. Additionally, it pinpoints several sources and the effects of Cd and other technologies used for Cd remediation. This paper provides the recent development in mechanisms of Cd hyperaccumulation by different plants, in order to motivate further research in this field.

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