Novel carbon nanotube (CNT)-based ultrasensitive sensors for trace mercury(II) detection in water: A review

Pokhrel, Lok R.; Ettore, Nicholas; Jacobs, Zachary L.; Zarr, Asha; Weir, Mark H.; Scheuerman, Phillip R.; Kanel, Sushil R.; Dubey, Brajesh

doi:10.1016/j.scitotenv.2016.08.055

Cited by 72 publications

(25 citation statements)

References 38 publications

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“…Carbon-based nanomaterials are a popular choice for improving the electrochemical detection of mercury, as this type of material exhibits a high surface area, strong mechanical strength, excellent thermal conductivity, and high conductivity [82][83][84]. Some of the carbon nanomaterials in recent literature include glassy carbon [85,86], carbon nanotubes [87], graphene [88], and reduced graphene oxide [89]. While each of these nanocarbon materials is efficient for mercury detection via stripping voltammetry, some of the materials are complicated to fabricate and exhibit poor water solubility [90].…”

Section: Alerting Mercury Exposure In Artisanal Gold Mining Communitiesmentioning

confidence: 99%

Sensor-as-a-Service: Convergence of Sensor Analytic Point Solutions (SNAPS) and Pay-A-Penny-Per-Use (PAPPU) Paradigm as a Catalyst for Democratization of Healthcare in Underserved Communities

et al. 2020

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In this manuscript, we discuss relevant socioeconomic factors for developing and implementing sensor analytic point solutions (SNAPS) as point-of-care tools to serve impoverished communities. The distinct economic, environmental, cultural, and ethical paradigms that affect economically disadvantaged users add complexity to the process of technology development and deployment beyond the science and engineering issues. We begin by contextualizing the environmental burden of disease in select low-income regions around the world, including environmental hazards at work, home, and the broader community environment, where SNAPS may be helpful in the prevention and mitigation of human exposure to harmful biological vectors and chemical agents. We offer examples of SNAPS designed for economically disadvantaged users, specifically for supporting decision-making in cases of tuberculosis (TB) infection and mercury exposure. We follow-up by discussing the economic challenges that are involved in the phased implementation of diagnostic tools in low-income markets and describe a micropayment-based systems-as-a-service approach (pay-a-penny-per-use—PAPPU), which may be catalytic for the adoption of low-end, low-margin, low-research, and the development SNAPS. Finally, we provide some insights into the social and ethical considerations for the assimilation of SNAPS to improve health outcomes in marginalized communities.

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Section: Alerting Mercury Exposure In Artisanal Gold Mining Communitiesmentioning

confidence: 99%

Sensor-as-a-Service: Convergence of Sensor Analytic Point Solutions (SNAPS) and Pay-A-Penny-Per-Use (PAPPU) Paradigm as a Catalyst for Democratization of Healthcare in Underserved Communities

et al. 2020

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“…In fact, the European Union (EU) has established the maximum allowable mercury concentration in surface water as 3.49 × 10 −10 M [9]. As a consequence, the detection of this water contaminant has attracted the interest of scientists during the last few years, leading to the development of a wide variety of Hg 2+ -sensitive devices [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Development of an Aptamer Based Luminescent Optical Fiber Sensor for the Continuous Monitoring of Hg2+ in Aqueous Media

Elosúa

Arregui

2020

Sensors

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A fluorescent optical fiber sensor for the detection of mercury (Hg2+) ions in aqueous solutions is presented in this work. The sensor was based on a fluorophore-labeled thymine (T)-rich oligodeoxyribonucleotide (ON) sequence that was directly immobilized onto the tip of a tapered optical fiber. In the presence of mercury ions, the formation of T–Hg2+-T mismatches quenches the fluorescence emission by the labeled fluorophore, which enables the measurement of Hg2+ ions in aqueous solutions. Thus, in contrast to commonly designed sensors, neither a fluorescence quencher nor a complementary ON sequence is required. The sensor presented a response time of 24.8 seconds toward 5 × 10−12 M Hg2+. It also showed both good reversibility (higher than the 95.8%) and selectivity: the I0/I variation was 10 times higher for Hg2+ ions than for Mn2+ ions. Other contaminants examined (Co2+, Ag+, Cd2+, Ni2+, Ca2+, Pb2+, Mn2+, Zn2+, Fe3+, and Cu2+) presented an even lower interference. The limit of detection of the sensor was 4.73 × 10−13 M Hg2+ in buffer solution and 9.03 × 10−13 M Hg2+ in ultrapure water, and was also able to detect 5 × 10−12 M Hg2+ in tap water.

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“…This manuscript details the work carried out in this direction and its outcome. colorimetric analysis is based on the change in the intensity of the colour of a solution with variations in concentration [9][10][11]. colorimetric methods represent the simplest form of absorption analysis.…”

Section: Introductionmentioning

confidence: 99%

Quick detection of iron in contaminated water before feeding to RO membranes

et al. 2019

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This paper describes the need for detection of iron, preparation method of colorimetric material and response studies for detection of iron in contaminated water. Iron is a membrane foulant, and high concentration of it produces membrane fouling. Membrane fouling decreases the flux rate and efficiency of salt rejection and makes the membrane more susceptible to oxidation damage. Therefore, iron detection is essential in feed water before passing through RO membrane. Under this objective, a material was prepared through reaction of 1,10-phenanthroline with ascorbic acid and trisodium citrate (weight ratio 1:1:2). The prepared material shows significant response towards iron, and it is observed through naked eye. A yellow colour to change into orange red colour was observed within 5 min when material was exposed to Fe(II) ions at 300 µg/L as per IS 10500. UV-visible spectra of 1,10-phenanthroline-Fe complex show absorbance at wavelength 510 nm with iron without interference of other metal ions, viz. Cd(II), Co(II), Ni(II), Hg(II), Zn(II), Pb(II) and high TDS water.

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Novel carbon nanotube (CNT)-based ultrasensitive sensors for trace mercury(II) detection in water: A review

Cited by 72 publications

References 38 publications

Sensor-as-a-Service: Convergence of Sensor Analytic Point Solutions (SNAPS) and Pay-A-Penny-Per-Use (PAPPU) Paradigm as a Catalyst for Democratization of Healthcare in Underserved Communities

Sensor-as-a-Service: Convergence of Sensor Analytic Point Solutions (SNAPS) and Pay-A-Penny-Per-Use (PAPPU) Paradigm as a Catalyst for Democratization of Healthcare in Underserved Communities

Development of an Aptamer Based Luminescent Optical Fiber Sensor for the Continuous Monitoring of Hg2+ in Aqueous Media

Quick detection of iron in contaminated water before feeding to RO membranes

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