Environment-Friendly Electrochemical Processes

Martínez‐Huitle, Carlos A.

doi:10.3390/ma14061548

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…Finally, even if the LOD reported in this work (1.05 µM) is slightly above the detection limit established by other materials (see Table 2 ), there is room for improvements; for example, the size of the electrochemical sensor which could be reduced, the use of other carbon-based modifiers [ 21 , 22 ] which could enhance its selectivity and sensitivity, and consequently, improving the LOD. Finally, integrated environmentally-friendly electrochemical technologies [ 15 ] could be proposed for removing and detecting pollutants by using sensors and advanced oxidation/reduction processes [ 15 , 47 , 48 ] because it is possible to design small portable devices for monitoring pollutants before and after their elimination from water which benefit the use of specific strategies in real time. In fact, regarding the treatment of the river water sample in which was detected a HCQ contamination, reported in this work, it could be treated by electrochemical oxidation technology [ 15 , 48 , 49 ] and monitored by using the cork–graphite-based sensor proposed here.…”

Section: Discussionmentioning

confidence: 99%

Green Composite Sensor for Monitoring Hydroxychloroquine in Different Water Matrix

et al. 2021

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Hydroxychloroquine (HCQ), a derivative of 4-aminoquinolone, is prescribed as an antimalarial prevention drug and to treat diseases such as rheumatoid arthritis, and systemic lupus erythematosus. Recently, Coronavirus (COVID-19) treatment was authorized by national and international medical organizations by chloroquine and hydroxychloroquine in certain hospitalized patients. However, it is considered as an unproven hypothesis for treating COVID-19 which even itself must be investigated. Consequently, the high risk of natural water contamination due to the large production and utilization of HCQ is a key issue to overcome urgently. In fact, in Brazil, the COVID-19 kit (hydroxychloroquine and/or ivermectin) has been indicated as pre-treatment, and consequently, several people have used these drugs, for longer periods, converting them in emerging water pollutants when these are excreted and released to aquatic environments. For this reason, the development of tools for monitoring HCQ concentration in water and the treatment of polluted effluents is needed to minimize its hazardous effects. Then, in this study, an electrochemical measuring device for its environmental application on HCQ control was developed. A raw cork–graphite electrochemical sensor was prepared and a simple differential pulse voltammetric (DPV) method was used for the quantitative determination of HCQ. Results indicated that the electrochemical device exhibited a clear current response, allowing one to quantify the analyte in the 5–65 µM range. The effectiveness of the electrochemical sensor was tested in different water matrices (in synthetic and real) and lower HCQ concentrations were detected. When comparing electrochemical determinations and spectrophotometric measurements, no significant differences were observed (mean accuracy 3.0%), highlighting the potential use of this sensor in different environmental applications.

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Section: Discussionmentioning

confidence: 99%

Green Composite Sensor for Monitoring Hydroxychloroquine in Different Water Matrix

et al. 2021

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“…Red peanut skin (RPS) is an attractive lignocellulosic adsorbent biomass with a rich surface grouping structure, allowing for interesting shape selectivity and an appreciable specific surface [18]. The proposed approach can be used effectively to keep the effluent concentration well below the permissible limit and to ensure the minimum solid waste management of toxic metal-loaded adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Water Cleaning by a Continuous Fixed-Bed Column for Cr(VI) Eco-Adsorption with Green Adsorbent-Based Biomass: An Experimental Modeling Study

et al. 2023

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In this study, chromate adsorption onto red peanut skin (RPS) was investigated in a fixed-bed column; FTIR, PZC, SEM, DLS, and BET were used to evaluate its adsorption properties. The experiments were conducted to determine the effect of physical parameters, including the inlet initial Cr(VI) concentration (100–500 mg L−1), bed height (10–20 cm), and feed flow rate (13.59–23.45 mL min−1). They were carried out to predict breakthrough curves. The adsorption capacity coefficients were determined using the most widely used Bohart–Adams model. It was tested to fit experimental data, for a better understand the dynamic behavior, and for further optimize column performance. It was found that the Cr(VI) uptake decreases when increasing the flow rate and that high chromate concentration and bed height consequently increase the column’s life span. A high column adsorption capacity can be achieved with a higher Cr(VI) concentration due to the higher driving force. The results indicated that the Bohart–Adams model provides a good description (R2 > 0.98) of the experimental data of the Cr(VI)’s removal from the aqueous solution on the RPS suggesting that the surface diffusion is the rate-limiting step in the continues adsorption process.. Breakthrough adsorption capacity is crucial for comparing RPS with other similar materials. Indeed, possible mechanisms have been suggested for illustrating adsorption onto RPS. The obtained results showed significant potential of 26.23 mg g−1 of RPS on Cr(VI) elimination at a natural pH of 5.35. Furthermore, this global investigation allowed for the design of a promising low-cost material for the future scale-up of cleaning wastewater polluted by metal and determine the properly conditions for operating column adsorption. This material provides an economical, efficient means of eliminating pollutants, thus meeting the main aims of the UN Sustainable Development Goals (UN SDGs).

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