scholarly journals Nanoadsorbants for the Removal of Heavy Metals from Contaminated Water: Current Scenario and Future Directions

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1379
Author(s):  
Rohit Kumar ◽  
Protima Rauwel ◽  
Erwan Rauwel
Keyword(s):  
Heavy Metals ◽  
Cost Effective ◽  
Water Current ◽  
Contaminated Water ◽  
Metallic Ions ◽  
Future Directions ◽  
The Past ◽  
Commercial Scale ◽  
Removal Of Heavy Metals ◽  
Current Scenario

Heavy metal pollution of aquatic media has grown significantly over the past few decades. Therefore, a number of physical, chemical, biological, and electrochemical technologies are being employed to tackle this problem. However, they possess various inescapable shortcomings curbing their utilization at a commercial scale. In this regard, nanotechnology has provided efficient and cost-effective solutions for the extraction of heavy metals from water. This review will provide a detailed overview on the efficiency and applicability of various adsorbents, i.e., carbon nanotubes, graphene, silica, zero-valent iron, and magnetic nanoparticles for scavenging metallic ions. These nanoparticles exhibit potential to be used in extracting a variety of toxic metals. Recently, nanomaterial-assisted bioelectrochemical removal of heavy metals has also emerged. To that end, various nanoparticle-based electrodes are being developed, offering more efficient, cost-effective, ecofriendly, and sustainable options. In addition, the promising perspectives of nanomaterials in environmental applications are also discussed in this paper and potential directions for future works are suggested.

scholarly journals Groundwater Arsenic Contamination in West Bengal: Current Scenario, Effects and Probable Ways of Mitigation

2014 ◽  
Vol 13 ◽  
pp. 45-58 ◽  
Author(s):  
Tanmoy Kumar Dey ◽  
Priya Banerjee ◽  
Madhurima Bakshi ◽  
Abhirupa Kar ◽  
Somdeep Ghosh
Keyword(s):  
Drinking Water ◽  
Chronic Exposure ◽  
West Bengal ◽  
Contaminated Water ◽  
Safe Drinking Water ◽  
Essential Step ◽  
The Past ◽  
Groundwater Arsenic ◽  
Current Scenario ◽  
Mind Set

During the past two decades, Arsenic (As) contamination via groundwater has become a serious issue worldwide and is now a major concern in the Indo-Bangladesh Gangetic delta. Arsenic enters human body through contaminated groundwater consumed as drinking water. Food safety in this region is also facing severe consequences as bio-accumulation of Arsenic is occurring in food crops irrigated with As-contaminated water. Chronic exposure to Arsenic can cause not only cancerous and non-cancer health effects. Reports suggest that about 20 % population in West Bengal is highly affected. Various techniques are being introduced to provide arsenic-free drinking water at an affordable cost. But a rigorous change in habit and mind set for procuring safe drinking water in those surviving in As-contaminated zones is the most essential step towards curbing the fatal consequences of As exposure. Harvesting rain water and utilization of proper purification techniques can be considered a possible alternative of safe drinking water.

scholarly journals The simultaneous removal of heavy metals and organic contaminants over a Bi2WO6/mesoporous TiO2 nanotube composite photocatalyst

RSC Advances ◽  
2020 ◽  
Vol 10 (36) ◽  
pp. 21228-21237
Author(s):  
Lei Cheng ◽  
Sijia Liu ◽  
Guangying He ◽  
Yun Hu
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Organic Contaminants ◽  
Dibutyl Phthalate ◽  
Mesoporous Tio2 ◽  
Contaminated Water ◽  
Simultaneous Removal ◽  
Composite Photocatalyst ◽  
Removal Of Heavy Metals ◽  
Nanotube Composites

In this study, Bi2WO6/mesoporous TiO2 nanotube composites (BWO/TNTs) were successfully synthesized to remove the heavy metal Cr(vi) and refractory organic compound dibutyl phthalate (DBP) from contaminated water under visible light.

Removal of heavy metals from artificial metals contaminated water samples based on micelle-templated silica modified with pyoverdin I

2009 ◽  
Vol 21 (7) ◽  
pp. 1009-1016 ◽  
Author(s):  
Tansupo PANADDA ◽  
Chamonkolpradit WORAKARN ◽  
Chanthai SAKSIT ◽  
Ruangviriyachai CHALERM
Keyword(s):  
Heavy Metals ◽  
Water Samples ◽  
Contaminated Water ◽  
Removal Of Heavy Metals

scholarly journals Magnetic Graphene Oxide Composites are the Solutions for Sustainable Remediation of Ecosystems

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Lakshmi Prasanna Koduru
Keyword(s):  
Heavy Metals ◽  
Graphene Oxide ◽  
Membrane Separation ◽  
Anthropogenic Activities ◽  
Low Cost ◽  
Cost Effective ◽  
Hybrid Nanocomposites ◽  
Magnetic Graphene Oxide ◽  
Removal Of Heavy Metals ◽  
Potential Applications

Heavy metals are one of the primary contaminants in the environment [1]. Exposure to heavy metals, even at trace levels, is believed to be a high health risk for humans [2,3]. Heavy metals are naturally occurring throughout the earth’s crust [4]. But most of the environmental contamination results from the anthropogenic activities such as mining and smelting operations, industry, and domestic and agricultural use of metals and metalcontaining compounds. Migration of these contaminants into non-contaminated areas as dust or leachates through the soil and spreading of heavy metals containing sewage sludge are a few examples of events contributing towards contamination of the ecosystems [5]. Hence, water is the one of the major routes through which heavy metals and radionuclides may enter the human body [6,7]. The sources of water pollution are shown in Figure 1. The conventional wastewater purification techniques including chemical coagulation, photo degradation, precipitation, flocculation, activated sludge, membrane separation and ion exchange are limited to the removal of heavy metals at trace levels [7-9]. However, adsorption is one of the best methods for the purification of water, owing to its low cost and easy handling of materials [7,10-12]. Moreover, adsorption approaches using commercial activated carbon, micro-filtration and membrane techniques are effective, but their use is limited by the complicated installation process involved coupled with the high maintenance costs of the systems [7,13]. Hence, these drawbacks have necessitated the search for an alternative method which is inexpensive, renewable and cost-effective for the removal of heavy metals from aqueous solutions. Many scientific groups have prepared graphene or graphene oxide (GO) based hybrid nanocomposites for various potential applications [14-17]. The study of literature survey and stability of the GO-based nanocomposites prompted us to survey on graphene oxide and reduced graphene oxide-based inverse spinel nickel ferrite nanocomposites for the removal of heavy metals and radionuclides from water with the purpose of reducing their environmental impact

scholarly journals THE INITIAL ION EFFECT OF HEAVY METALS ADSORPTION BY USING HYDROTHERMAL CARBONIZATION BANANA PEELS

2020 ◽  
Vol 4 (1) ◽  
pp. 08-10
Author(s):  
Nurhaliza Said Mohd ◽  
Rabiatul Manisah Mohamed
Keyword(s):  
Heavy Metals ◽  
Phase 1 ◽  
Chemical Characterization ◽  
Cost Effective ◽  
Hydrothermal Carbonization ◽  
Banana Peel ◽  
Initial Concentration ◽  
Heavy Metals Adsorption ◽  
Removal Of Heavy Metals ◽  
Metals Adsorption

Accumulation of heavy metals in water is of particularly important because it can impact upon human health through possible contamination of food. The use of banana peel was investigated. Hydrothermal carbonization (HTC) was chosen as alternative process. The objective of this project is to synthesize banana peel hydrochars adsorbent via HTC process and to evaluate the heavy metals adsorption performance of banana peel hydrochars adsorbent. Conventional methods in removal of heavy metals require high operational cost, need highly skilled labour, and generate sludge at the end of the operation. Compared to other techniques, banana peel absorbent is a cost- effective adsorbent, easy to operate, environmentally safe and no health risk for the operator. Besides, large quantity of banana peel waste contributes to its significant disposal problem. Thus, this study is expected to solve problems of banana peel, by preparing banana peel adsorbent through hydrothermal carbonization. There are three phases in this project, phase 1 which is synthesis of banana peel based on hydrochars, banana peel was chopped the peels into small pieces. It was then soaked in KOH solution for 2hours and transferred into PTFE and heat for 2hours at 230°C. For phase 2, physico-chemical characterization of banana peels hydrochars by using FTIR. The result obtained shown that all of the content in banana peels will activate the surface of banana peel to enhance the adsorption of the heavy metals. For the final phase, by using AAS, the initial and final concentration of the metals was tested to determine the removal of heavy metals by the prepared hydrochars. The results showed that the removal capacity of the hydrochars increased when the initial concentration of the metals increased. From the research, it can be concluded that, as the initial concentration of the metals higher, the ability of the hydrochars to remove the metals also higher and stronger.

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