Heavy metal removal by biomass-derived carbon nanotubes as a greener environmental remediation: A comprehensive review

Chemosphere ◽  
2021 ◽  
pp. 131959
Author(s):  
Anh Tuan Hoang ◽  
Sandro Nižetić ◽  
Chin Kui Cheng ◽  
Rafael Luque ◽  
Sabu Thomas ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Environmental Remediation ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Comprehensive Review

scholarly journals A Way to Membrane-Based Environmental Remediation for Heavy Metal Removal

Environments ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 52
Author(s):  
Catia Algieri ◽  
Sudip Chakraborty ◽  
Sebastiano Candamano
Keyword(s):  
Heavy Metal ◽  
Environmental Remediation ◽  
High Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Scale Up ◽  
Operating Conditions ◽  
Advantages And Disadvantages ◽  
Research Activities ◽  
Key Steps

During the last century, industrialization has grown very fast and as a result heavy metals have contaminated many water sources. Due to their high toxicity, these pollutants are hazardous for humans, fish, and aquatic flora. Traditional techniques for their removal are adsorption, electro-dialysis, precipitation, and ion exchange, but they all present various drawbacks. Membrane technology represents an exciting alternative to the traditional ones characterized by high efficiency, low energy consumption and waste production, mild operating conditions, and easy scale-up. In this review, the attention has been focused on applying driven-pressure membrane processes for heavy metal removal, highlighting each of the positive and negative aspects. Advantages and disadvantages, and recent progress on the production of nanocomposite membranes and electrospun nanofiber membranes for the adsorption of heavy metal ions have also been reported and critically discussed. Finally, future prospective research activities and the key steps required to make their use effective on an industrial scale have been presented

Heavy metal removal from aqueous solution by advanced carbon nanotubes: Critical review of adsorption applications

2016 ◽  
Vol 157 ◽  
pp. 141-161 ◽  
Author(s):  
Ihsanullah ◽  
Aamir Abbas ◽  
Adnan M. Al-Amer ◽  
Tahar Laoui ◽  
Mohammed J. Al-Marri ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Heavy Metal ◽  
Critical Review ◽  
Metal Removal ◽  
Heavy Metal Removal

Environmental remediation of heavy metal ions from aqueous solution through hydrogel adsorption: a critical review

2015 ◽  
Vol 73 (5) ◽  
pp. 983-992 ◽  
Author(s):  
Francis Ntumba Muya ◽  
Christopher Edoze Sunday ◽  
Priscilla Baker ◽  
Emmanuel Iwuoha
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Environmental Remediation ◽  
Heavy Metal Ions ◽  
Metal Removal ◽  
Aqueous Media ◽  
Heavy Metal Removal ◽  
Aquatic Life ◽  
Potential Toxic Elements ◽  
Treatment Technologies

Heavy metal ions such as Cd2+, Pb2+, Cu2+, Mg2+, and Hg2+ from industrial waste water constitute a major cause of pollution for ground water sources. These ions are toxic to man and aquatic life as well, and should be removed from wastewater before disposal. Various treatment technologies have been reported to remediate the potential toxic elements from aqueous media, such as adsorption, precipitation and coagulation. Most of these technologies are associated with some shortcomings, and challenges in terms of applicability, effectiveness and cost. However, adsorption techniques have the capability of effectively removing heavy metals at very low concentration (1–100 mg/L). Various adsorbents have been reported in the literature for this purpose, including, to a lesser extent, the use of hydrogel adsorbents for heavy metal removal in aqueous phase. Here, we provide an in-depth perspective on the design, application and efficiency of hydrogel systems as adsorbents.

scholarly journals Enhanced Heavy Metal Removal from Acid Mine Drainage Wastewater Using Double-Oxidized Multiwalled Carbon Nanotubes

Molecules ◽  
2019 ◽  
Vol 25 (1) ◽  
pp. 111 ◽  
Author(s):  
Carolina Rodríguez ◽  
Eduardo Leiva
Keyword(s):  
Heavy Metals ◽  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Multiwalled Carbon Nanotubes ◽  
Sorption Capacity ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Order Kinetic ◽  
Multiwalled Carbon ◽  
Oxidized Multiwalled Carbon Nanotubes

Due to the unique properties of carbon nanotubes (CNTs), they have attracted great research attention as an emergent technology in many applications including water and wastewater treatment. However, raw CNTs have few functional groups, which limits their use in heavy metal removal. Nevertheless, their removal properties can be improved by oxidation processes that modify its surface. In this study, we assessed the capacity of oxidized and double-oxidized multiwalled carbon nanotubes (MWCNTs) to remove heavy metals ions from acidic solutions. The MWCNTs were tested for copper (Cu), manganese (Mn), and zinc (Zn) removal, which showed an increment of 79%, 78%, and 48%, respectively, with double-oxidized MWCNTs compared to oxidized MWCNTs. Moreover, the increase in pH improved the sorption capacity for all the tested metals, which indicates that the sorption potential is strongly dependent on the pH. The kinetic adsorption process for three metals can be described well with a pseudo-second-order kinetic model. Additionally, in multimetallic waters, the sorption capacity decreases due to the competition between metals, and it was more evident in the removal of Zn, while Cu was less affected. Besides, XPS analysis showed an increase in oxygen-containing groups on the MWCNTs surface after oxidation. Finally, these analyses showed that the chemical interactions between heavy metals and oxygen-containing groups are the main removal mechanism. Overall, these results contribute to a better understanding of the potential use of CNTs for water treatment.

Capacitive deionization and electrosorption for heavy metal removal

2020 ◽  
Vol 6 (2) ◽  
pp. 258-282 ◽  
Author(s):  
Raylin Chen ◽  
Thomas Sheehan ◽  
Jing Lian Ng ◽  
Matthew Brucks ◽  
Xiao Su
Keyword(s):  
Heavy Metal ◽  
Wastewater Treatment ◽  
Water Purification ◽  
Environmental Remediation ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Resource Recovery ◽  
Capacitive Deionization

Electrosorption and capacitive deionization technologies can be effective processes in removing heavy metal for water purification, wastewater treatment, resource recovery, and environmental remediation.

scholarly journals Applications of Nanomaterials for Heavy Metal Removal from Water and Soil: A Review

2021 ◽  
Vol 13 (2) ◽  
pp. 713
Author(s):  
Guo Yu ◽  
Xinshuai Wang ◽  
Jie Liu ◽  
Pingping Jiang ◽  
Shaohong You ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Environmental Remediation ◽  
Metal Removal ◽  
Chemical Reactivity ◽  
Heavy Metal Removal ◽  
Factors Affecting ◽  
Adsorption Capacities ◽  
Challenges And Opportunities ◽  
Points Of View ◽  
Widespread Interest

Heavy metals are toxic and non-biodegradable environmental contaminants that seriously threaten human health. The remediation of heavy metal-contaminated water and soil is an urgent issue from both environmental and biological points of view. Recently, nanomaterials with excellent adsorption capacities, great chemical reactivity, active atomicity, and environmentally friendly performance have attracted widespread interest as potential adsorbents for heavy metal removal. This review first introduces the application of nanomaterials for removing heavy metal ions from the environment. Then, the environmental factors affecting the adsorption of nanomaterials, their toxicity, and environmental risks are discussed. Finally, the challenges and opportunities of applying nanomaterials in environmental remediation are discussed, which can provide perspectives for future in-depth studies and applications.

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.

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