Application of Carbon Nanotubes (CNTs) for Remediation of Emerging Pollutants - A Review

2021 ◽  
Vol 2 (1) ◽  
pp. 13-26
Author(s):  
Jia Hui Chung ◽  
Nur Hasyimah ◽  
Norelyza Hussein
Keyword(s):  
Heavy Metals ◽  
Carbon Nanotube ◽  
Environmental Remediation ◽  
Membrane Filtration ◽  
Anthropogenic Activities ◽  
Chemical Properties ◽  
The Body ◽  
Production Costs ◽  
Body Tissues ◽  
Wide Range

Nanotechnology is currently an upward trend in diverse fields, and therefore, its application will be reviewed in this paper. One of the nanotechnologies which can be used in environmental remediation is carbon nanotube (CNT). Its excellent mechanical and chemical properties allow it to have better achievement in remediating a wide range of organic and inorganic pollutants. CNT can be categorized into two types: single-walled carbon nanotube and multi-walled carbon nanotube. Due to urbanization, various types of pollutants have been released into the environment in great amounts. For instance, estrogen is the hormone generated and released from animals and humans. However, the overconcentration of estrogen affects the physiology of biological life. Besides, pesticides are frequently used by farmers to increase the fertility of the land for agricultural purposes, while heavy metals are commonly found during anthropogenic activities. Long-term absorption of heavy metals into the body tissues will accumulate toxic effects, leading to body system dysfunction. Hence, CNT technologies, including adsorption, membrane filtration, disinfection, hybrid catalysis, and sensing and monitoring, can be applied to remediate these pollutants. However, the application of nanotechnology and CNT faces several challenges, such as production costs, toxicity, ecological risks, and public acceptance. Application of CNT also has pros and cons, such that the lightweight of the CNT allows them to replace metallic wires, but dealing with nano-sized components makes it challenging.

scholarly journals Residual Metal Contamination of the ecosystem in the lower course of the Jihlava River

2009 ◽  
Vol 78 (3) ◽  
pp. 525-534 ◽  
Author(s):  
Petr Spurný ◽  
Jan Mareš ◽  
Josef Hedbávný ◽  
Ivo Sukop
Keyword(s):  
Heavy Metals ◽  
Previous Investigation ◽  
Fish Community ◽  
The Body ◽  
Human Consumption ◽  
Ecological Data ◽  
Tissue Concentrations ◽  
Body Tissues ◽  
The Stability ◽  
Index Of Diversity

In November 2001, October and November 2002, the concentrations of Hg, Cd, Pb, Cr, Cu, Zn and Ni were determined in four localities of the lower course of the Jihlava River (Czech Republic). The river water, sediments of the riverbed, zoobenthos and tissues of the fish (gill, gonad, skin, dorsal muscle) were analysed. The chub (Leuciscus cephalus) was used as the ichthyo-indicator. At the same time, the stability of the fish community was evaluated using electrofishing and applying basic ichthyological methods. The work links up with previous investigation of the upper course of the Jihlava River (three localities) carried out by the authors in the same way in 1999. The aim of present study was the completion of previous investigation in the whole longitudinal river profile by monitoring selected heavy metals. The highest Cr (14.290 – 77.070 mg/kg), Zn (13.600 – 92.930 mg/kg) and Ni concentrations (12.290 – 36.680 mg/kg) were found in sediments and their highest loading by all of the monitored metals (without Ni) was detected in the last downstream locality (Pohořelice). Zoobenthos was most contaminated by Zn and Cu (7.480 – 62.690 and 8.050 – 21.810 mg/kg). In the body tissues of the chubs, the highest concentrations of Cd, Hg, Cu, Zn and Ni were determined in the gills, while Pb was also high in gills but also in gonads, the skin and in the muscle tissue. Concentrations of the analysed metals in the chub muscle were (in mg/kg): Hg 0.040 ± 0.014 – 0.133 ± 0.063, Cd 0.003 ± 0.002 – 0.010 ± 0.004, Pb 0.045 ± 0.038 – 0.768 ± 0.038, Cr 0.046 ± 0.023 – 0.106 ± 0.092, Cu 0.203 ± 0.123 – 0.634 ± 0.194, Zn 4.25 ± 0.84 – 6.69 ± 2.95 and Ni 0.062 ± 0.018 – 0.103 ± 0.030. Significant differences in the chub muscle were found concerning Hg, Pb, Cu (P < 0.01) and Cd (P < 0.05). Taking into consideration the actually valid FAO/WHO limits for human consumption of chub muscle from the investigated river section, only Hg (PTWI 2.3 kg in locality 7) and Pb (PTWI 2.0 kg in locality 4) could constitute some risk for human health. The index of diversity of the fish community was 0.825 – 2.110, equitability index 0.380 – 0.793, abundance 312.6 – 2,106.5 fish/ha and biomass 46.7 – 451.5 kg/ha. The water quality was characterized as betamesosaprobic (saprobity index 1.77 – 2.18). The results of the study reveal detailed ecological data concerning heavy metals contamination of the whole Jihlava River ecosystem (water, sediment, zoobenthos, fish). The outcome of this study extends our knowledge about metals accumulation in different fish tissues (gill, gonad, skin and muscle).

scholarly journals Starch-Based Hybrid Nanomaterials for Environmental Remediation

2021 ◽  
Author(s):  
Ashoka Gamage ◽  
Thiviya Punniamoorthy ◽  
Terrence Madhujith
Keyword(s):  
Metal Oxide ◽  
Environmental Remediation ◽  
Membrane Filtration ◽  
Anthropogenic Activities ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
Volume Ratio ◽  
Hybrid Nanomaterials ◽  
Metal Metal

Environmental pollution is becoming a major global issue with increasing anthropogenic activities that release massive toxic pollutants into the land, air, and water. Nanomaterials have gained the most popularity in the last decades over conventional methods because of their high surface area to volume ratio and higher reactivity. Nanomaterials including metal, metal oxide, zero-valent ions, carbonaceous nanomaterials, and polymers function as adsorbents, catalysts, photocatalysts, membrane (filtration), disinfectants, and sensors in the detection and removal of various pollutants such as heavy metals, organic pollutants, dyes, industrial effluents, and pathogenic microbial. Polymer-inorganic hybrid materials or nanocomposites are highly studied for the removal of various contaminants. Starch, a heteropolysaccharide, is a natural biopolymer generally incorporated with other metal, metal oxide, and other polymeric nanoparticles and has been reported in various environmental remediation applications as a low-cost alternative for petroleum-based polymers. Therefore, this chapter mainly highlights the various nanomaterials used in environmental remediation, starch-based hybrid nanomaterials, and their application and limitations.

Functionalized Magnetic Nanoparticles for Environmental Remediation

2017 ◽  
pp. 705-741
Author(s):  
Ravindra Kumar Gautam ◽  
Shivani Soni ◽  
Mahesh Chandra Chattopadhyaya
Keyword(s):  
Heavy Metals ◽  
Magnetic Nanoparticles ◽  
Environmental Remediation ◽  
Anthropogenic Activities ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
Toxic Metal ◽  
Volume Ratio ◽  
Removal Of Heavy Metals

Water pollution by anthropogenic activities is proving to be of critical concern as the heavy metals affect aquatic organisms and can quickly disperse to large distances. This poses a risk to both human health and the aquatic biota. Hence, there is a need to treat the wastewater containing toxic metals before they are discharged into the water bodies. During recent years, magnetic nanoparticles came to the foreground of scientific interest as a potential adsorbent of novel wastewater treatment processes. Magnetic nanoparticles have received much attention due to their unique properties, such as extremely small size, high surface-area-to-volume ratio, surface modifiability, multi functionality, excellent magnetic properties, low-cost synthesis, and great biocompatibility. The multi-functional magnetic nanoparticles have been successfully applied for the reduction of toxic metal ions up to ppb level in waste-treated water. This chapter highlights the potential application of magnetic nanoparticles for the removal of heavy metals.

Functionalized Magnetic Nanoparticles for Environmental Remediation

2015 ◽  
pp. 518-551 ◽  
Author(s):  
Ravindra Kumar Gautam ◽  
Shivani Soni ◽  
Mahesh Chandra Chattopadhyaya
Keyword(s):  
Heavy Metals ◽  
Magnetic Nanoparticles ◽  
Environmental Remediation ◽  
Anthropogenic Activities ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
Toxic Metal ◽  
Volume Ratio ◽  
Removal Of Heavy Metals

Water pollution by anthropogenic activities is proving to be of critical concern as the heavy metals affect aquatic organisms and can quickly disperse to large distances. This poses a risk to both human health and the aquatic biota. Hence, there is a need to treat the wastewater containing toxic metals before they are discharged into the water bodies. During recent years, magnetic nanoparticles came to the foreground of scientific interest as a potential adsorbent of novel wastewater treatment processes. Magnetic nanoparticles have received much attention due to their unique properties, such as extremely small size, high surface-area-to-volume ratio, surface modifiability, multi functionality, excellent magnetic properties, low-cost synthesis, and great biocompatibility. The multi-functional magnetic nanoparticles have been successfully applied for the reduction of toxic metal ions up to ppb level in waste-treated water. This chapter highlights the potential application of magnetic nanoparticles for the removal of heavy metals.

Kandungan Merkuri dalam Ikan Konsumsi di Wilayah Bantul dan Yogyakarta

2017 ◽  
Vol 2 (1) ◽  
pp. 15 ◽  
Author(s):  
Suratno Suratno ◽  
Muhammad Reza Cordova ◽  
Silke Arinda
Keyword(s):  
Heavy Metals ◽  
Eating Habits ◽  
Anthropogenic Activities ◽  
Mercury Content ◽  
The Body ◽  
The People ◽  
Low Concentrations ◽  
Saltwater Fish ◽  
Fish Samples ◽  
Long Time

<strong>Mercury Content in Commercial Fishes of Bantul Areas and Yogyakarta. </strong> Mercury Content in Commercial Fishes of Bantul Areas and Yogyakarta Fish is an important energy source for the body and has many functions for human health. Hence, the fish are highly favored for consumption by the public. However, the fish has the ability to accumulate heavy metals. One type of dangerous heavy metals and can accumulate in fish is mercury because it has high toxicity at low concentrations. The presence of contaminants from anthropogenic activities that are not processed previously, makes the fish a potential hoarder for heavy metals. This study examined the concentration of mercury in freshwater fish and saltwater fish consumed by the people of Bantul areas and Yogyakarta. Fish samples were collected on 29–30 August 2015 from Prawirotaman Market, supermarket, Embankment on the River Code, and purchased from fishermen in Depok Beach. Analysis of mercury concentrations in fish was done using mercury analyzer NIC MA-3000. The results indicated that the fish with the eating habits of benthivore and planktivore accumulated higher mercury than omninore and carnivore fish. The concentration of mercury in the fish examined does not exceed the threshold of the WHO standard, BPOM-RI, and European Union standards. However, the people need to be alert on mercury bioaccumulative properties, especially when consuming the fish having accumulated mercury continuously for a long time.

scholarly journals Carbon Nanotube (CNTs): Structure, Synthesis, Purification, Functionalisation, Pharmacology, Toxicology, Biodegradation and Application as Nanomedicine and Biosensor

2021 ◽  
Vol 001 (02) ◽  
Author(s):  
Jayendrakumar Patel ◽  
Shalin Parikh ◽  
Shwetaben Patel ◽  
Ronak Patel ◽  
Payalben Patel
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Surface Area ◽  
Carbon Nanostructures ◽  
The Body ◽  
Technological Advancement ◽  
Aggregation State ◽  
Wide Range ◽  
Biomedical Fields

It is well acknowledged that carbon nanotubes (CNTs) are a potential new class of nanomaterials for technological advancement. The recent discovery of diverse kinds of carbon nanostructures has sparked interest in the potential applications of these materials in a variety of disciplines. Numerous distinct carbon nanotube (CNT) production methods have been developed, and their characterisation, separation, and manipulation of individual CNTs are now possible. Structure, surface area, surface charge, size distribution, surface chemistry, aggregation state, and purity of the samples all have a significant impact on the reactivity of carbon nanotubes, as does the purity of the samples. Currently, carbon nanotubes (CNTs) are being successfully used in the medicinal, pharmaceutical, and biomedical fields because of their large surface area, which makes them capable of adsorbing or conjugating with a wide range of therapeutic and diagnostic substances (drugs, genes, vaccines, antibodies, biosensors, etc.). They were the first to demonstrate that they are a great vehicle for drug delivery straight into cells without the need for metabolic processing by the body. This paper discusses the different types, structures, and properties of CNTs, as well as CNT synthesis and purification methods, how to functionalize CNTs, and their application in medicinal, pharmaceutical, and biomedical fields, toxicological properties and their assessment, as well as in-vivo pharmacology and biodegradation pathways.

scholarly journals Determination of Heavy Metals in Water Samples from Sungai Kerteh and Sungai Paka, Terengganu, Malaysia

2017 ◽  
Vol 5 (2) ◽  
pp. 74-78
Author(s):  
Nor Sayzwani Sukri ◽  
Jessuta Jothivel ◽  
Rozidaini Mohd Ghazi ◽  
Nor Shahida Shafiee @ Ismail ◽  
Siti Hajar Yaacob ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Dissolved Oxygen ◽  
Water Samples ◽  
Anthropogenic Activities ◽  
Rapid Development ◽  
Chemical Properties ◽  
Heavy Metal Concentration ◽  
Quality Standard ◽  
Heavy Metals Pollution

Rapid development of industrialization and urbanization along Sungai Kerteh and Sungai Pakawas become a problem due to metal pollution. Namely, anthropogenic activities nearby SungaiKerteh and Sungai Paka were contributed to heavy metals pollution into those rivers. The aims forthis study were to determine the selected heavy metals contamination in water samples andcompared with National Water Quality Standard for Malaysia (NWQS). A total of 8 watersamples were collected from both rivers and heavy metal concentration were analyzed usingflame Atomic Absorption Spectroscopy (ASS). Four parameters of physical chemical propertieswere also analyzed which are pH, temperature, dissolved oxygen and turbidity. The ranges ofphysical chemical properties are pH (7.84-8.78), temperature (31.20 -38.70 oC), dissolved oxygen(27.90-107.20%) and turbidity (1.83-10.5 NTU) respectively. The mean of heavy metalsconcentration was ranged as followed; As (2323.00 ug/L) > Hg (571.93 ug/L) > Pb (402.13 ug/L)> Zn (87.13 ug/L) >Cr (74.63 ug/L) > Cu (48.50 ug/L) > Ni (17.25 ug/L) > Cd (11.38 ug/L).When compared with NWQS, most of metals (Cu, Pb, Ni and Zn) are below the NWQS thresholdlimit except As, Cd, Cr and Hg. The output data from this study can be used as database forcontinuous monitoring at both rivers.

DETERMINATION OF THE EFFECT OF HEAVY METALS IN HONEY ON ITS ORGANOLEPTIC AND PHYSICO-CHEMICAL PROPERTIES

2018 ◽  
Vol 1 (1) ◽  
pp. 32-37
Author(s):  
Z. N. Menshikova ◽  
◽  
V. A. Tolmacheva ◽  
D. V. Volodko ◽  
◽  
...  
Keyword(s):  
Heavy Metals ◽  
Physicochemical Properties ◽  
Human Health ◽  
Road Traffic ◽  
Animal Health ◽  
Motor Fuel ◽  
Chemical Properties ◽  
The Body ◽  
Potential Threat ◽  
Lead And Cadmium

The deterioration of the ecological situation in Russia and the contamination of environmental objects with various chemical compounds pose a growing threat to human and animal health and the state of the environment. Bee products can carry a potential threat to human health, as bees are in constant and direct contact with the environment. The article presents the results of a study of honey for heavy metals - lead and cadmium. The dependence of the amount of lead in honey from road traffic of highways in the flying radius of bees has been revealed. The direct dependence of the presence of lead in honey, pollution by its exhaust gases of cars from automobile traffic of a highway in the flying radius of bees is proved. A technique has been developed for determining the load of vehicles in the area, expressed in the release of lead into the atmosphere from combustible motor fuel. The organoleptic and physicochemical properties of the honey are determined. The article presents data that proves that the content of heavy metals in honey does not affect its organoleptic and physicochemical properties, but represents a real danger for human health, because heavy metals are cumulated in the body.

Layered Double Hydroxides Applications in the High-Performance Magnetic Nanomaterials

2020 ◽  
Vol 19 (05) ◽  
pp. 1950039
Author(s):  
Abdullah Ahmed Ali Ahmed
Keyword(s):  
Data Storage ◽  
Layered Double Hydroxides ◽  
Environmental Remediation ◽  
High Performance ◽  
Magnetic Nanostructures ◽  
Chemical Properties ◽  
Magnetic Nanomaterials ◽  
High Dispersion ◽  
Wide Range ◽  
Double Hydroxides

Layered double hydroxides (LDHs), which is related to magnetic nanomaterials’ have promising applications due to their unique structural and chemical properties. The easy tunability of cationic metals without changing the LDH structure as well as anion exchange features of LDH interlayer make them potential applications in supercapacitors, batteries, catalysis, water splitting, etc. Moreover, due to the high dispersion of active compounds in the matrix of LDH layers, LDHs have been used to construct various nanostructures such as nanoparticles, 2D monolayer nanosheets and 3D hierarchical’ which are valued in wide nanotechnological applications. Magnetic nanomaterials are an important research area because they have been applied to a wide range of disciplines such as biotechnology, data storage, magnetic fluids, magnetic resonance imaging, environmental remediation and catalysis. LDHs as starting materials including Ni, Fe or/and Co, can be used as magnetic nanomaterials. The combination between LDHs and magnetic nanostructures has improved the magnetic properties of those materials, hence can be used in more applications.

scholarly journals Impact of heavy metal ions on the simultaneous saccharification and fermentation of formosan alder biomass to form lactic acid

BioResources ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 882-892
Author(s):  
Chu-Han Ko ◽  
Ko-Yo Liu ◽  
Bing-Yuan Yang ◽  
Fang-Chih Chang ◽  
Po-Heng Lin
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Lactic Acid ◽  
Environmental Remediation ◽  
Simultaneous Saccharification And Fermentation ◽  
Lactic Acid Production ◽  
Heavy Metal Concentration ◽  
Wide Range ◽  
Negative Impacts ◽  
Simultaneous Saccharification

Formosan alder (Alnus formosana) is a fast-growing, adaptable, pioneer native tree species in Taiwan, and it is particularly suitable for reforestation. In this study, steam-exploded Formosan alder biomass was employed to investigate lactic acid production by simultaneous saccharification and fermentation (SSF) in the presence of different heavy metals. Impacts of added heavy metals on saccharification processing were investigated. In the presence of 1410 mg Cr6+/L, negative impacts were observed for SSF. The same level of Cr6+ adversely affected fermentation by Lactobacillus casei and L. acidophilus compared to the blank controls. Positive impacts for SSF by Cd2+ were demonstrated with 108 mg Cd2+/L, and the same conditions favored fermentation by L. casei and L. acidophilus. No impacts for SSF by Pb2+ up to 6830 mg Pb2+/L were found for both Lactobacillus strains. This study demonstrates that SSF for production of lactic acid from Formosan alder biomass was able to tolerate a wide range of heavy metal concentration regimes. Hence, this study provides an alternative use for biomass harvested from phytoremediation sites. Such biomass can be used as sustainable regenerative biomaterial, and thereby it can further enhance the benefits of environmental remediation.

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