New insights into the effect of pH on the mechanism of ofloxacin electrochemical detection in aqueous solution

Liu, Ting; Xue, Qi‐Kun; Jia, Jianbo; Liu, Fei; Zou, Shengzhang; Tang, Renshi; Chen, Tao; Li, Jiawei; Qian, Yumin

doi:10.1039/c9cp03486b

Cited by 36 publications

(18 citation statements)

References 41 publications

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“…In addition, these peaks related shoulder peaks are observed at 953.5 and 961.6 eV. As a result, the CuO and Cu 2 O were formed in the nanocomposites 45 – 47 . Therefore, the formation of Ni 2+ and Cu 2+ are increasing the lifetime of the photo-generated electrons and lead to induce the oxygen defect resulting generation of excess electrons and various reactive species that improved the photo electrocatalytic activity.…”

Section: Resultsmentioning

confidence: 91%

Investigation of electrocatalytic and photocatalytic ability of Cu/Ni/TiO2/MWCNTs Nanocomposites for detection and degradation of antibiotic drug Furaltadone

Vasu

Keyan

Sakthinathan

et al. 2022

Sci Rep

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In this manuscript, “Get two mangoes with one stone” strategy was used to study the electrochemical detection and photocatalytic mineralization of furaltadone (FLT) drug using Cu/Ni/TiO2/MWCNTs nanocomposites for the first time. The bi-functional nanocomposites were synthesized through a hydrothermal synthesis technique. The successfully synthesized nanocomposites were analyzed by various analytical techniques. The Cu/Ni/TiO2/MWCNTs nanocomposites decorated screen-printed carbon electrode (SPCE) exhibit a good electrocatalytic ability towards detection of FLT. Moreover, the electrocatalytic detection of FLT based on the nanocomposites decorated SPCE have high stability, lower detection limit, and excellent sensitivity of 0.0949 μM and 1.9288 μA μM−1 cm−2, respectively. In addition, the nanocomposites decorated SPCE electrodes performed in real samples, such as river water and tap water, the satisfactory results were observed. As UV–Visible spectroscopy revealed that the Cu/Ni/TiO2/MWCNTs nanocomposites had an excellent photocatalytic ability for degradation of FLT drug. The higher degradation efficiency of 75% was achieved within 45 min under irradiation of visible light. In addition, after the degradation process various intermediates are produced which is confirmed by GC–MS analysis. The excellent photocatalytic ability was improved to the dopant ions and restrictions of electron–hole pair.

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Section: Resultsmentioning

confidence: 91%

Investigation of electrocatalytic and photocatalytic ability of Cu/Ni/TiO2/MWCNTs Nanocomposites for detection and degradation of antibiotic drug Furaltadone

Vasu

Keyan

Sakthinathan

et al. 2022

Sci Rep

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“…Notably, at pH values of 8 and 9, the two antibiotics were dominated by negatively charged forms due to their higher pH values than the pKa values of the compounds. ese forms could ineffectively react with •OH; hence, removal efficiencies decrease [35,36]. All of the ciprofloxacin, cefuroxime, and COD (Figures 4(b)-4(e)) were completely degraded (∼90%) at pH 8; the further increase in the pH led to the slight reduction in the removal efficiency because, at a higher pH of 8, the two antibiotics could be negatively charged forms, leading to decrease in the removal efficiency [37].…”

Section: Effect Of the Initial Phmentioning

confidence: 98%

“…ree trends were observed during this treatment. In the case of ofloxacin and amoxicillin (Figures 4(a) and 4(d)), the variation in the removal efficiencies or breakpoint at pH 8 (ofloxacin 31.18%) and 9 (amoxicillin 41.63%) was possibly related to the existing forms of the two antibiotics [35]. Notably, at pH values of 8 and 9, the two antibiotics were dominated by negatively charged forms due to their higher pH values than the pKa values of the compounds.…”

Section: Effect Of the Initial Phmentioning

confidence: 99%

Removal of Antibiotics from Real Hospital Wastewater by Cold Plasma Technique

Nguyen

Tran

et al. 2021

Journal of Chemistry

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Hospital wastewater contains a complex mixture of bioactive substances and microorganisms that are deleterious to humans and aquatic animals. In this study, four antibiotics, namely, ofloxacin, ciprofloxacin, cefuroxime, and amoxicillin, respectively, from the wastewater of seven hospitals in Ho Chi Minh City, Vietnam, were monitored. The results revealed that the wastewater from these hospitals is contaminated with at least one of the antibiotics. In addition, the degradation capacity of the antibiotics by the wastewater treatment plant at one of the hospitals by the cold plasma technique was investigated. Furthermore, effects of the variation in pH, interelectrode distance, applied voltage, and reaction time on the removal efficiency were investigated in terms of the reduction in antibiotics concentration, COD, and ammonia. Ciprofloxacin, cefuroxime, COD, and ammonia were almost eliminated, while ofloxacin and amoxicillin were reduced by more than 72% under optimum conditions (initial pH of 10, reaction time of 15 min, applied voltage of 30 kV, and interelectrode distance of 10 mm). All of these factors affected the removal efficiency. The removal efficiency was most robust in the first 5 min, and it increased with the increase in the reaction time. However, the removal efficiency tended to saturate over time, while it decreased with the increase in the reaction time. With an applied voltage of 30 kV onwards, the removal efficiency was not significantly different. Most of the pollutants were predominately eliminated under slightly alkaline conditions (pH of ∼10). In addition, primary oxidants in the aqueous phase, such as O3, H2O2, and ⋅OH, were generated. Besides, the obtained results also revealed that the decomposition of ciprofloxacin and cefuroxime follows the first-order reaction kinetics; meanwhile, the third-order reaction kinetics was most likely for the decomposition of ofloxacin and amoxicillin.

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“…Simply put, a quantitative relationship is established between pollutant concentration and electrical signal (current value). 15 At the same time, the electrode can qualitatively and quantitatively identify different pollutants based on differences in oxidized or reduced peaks between pollutants. Fig.…”

Section: Development Of Electrochemical Sensors 21 Principles Of Electrochemical Sensor Detectionmentioning

confidence: 99%

Recent progress regarding electrochemical sensors for the detection of typical pollutants in water environments

et al. 2022

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A variety of organic and inorganic pollutants in water environments pose threats to human health. Therefore, it is critical to develop effective techniques to determine and monitor levels of water contamination. Compared with traditional detection methods, electrochemical sensors have the advantages of high sensitivity, low detection limits, and good selectivity. In this review, we summarize the progress made from 2000 to 2020 regarding the development of electrochemical sensors capable of detecting typical pollutants in different water environments. Since the concentrations of typical organic contaminants (antibiotics and pesticides) in water environments are often very low (generally at the nmol level), further improvements to electrode sensitivity and detection limit will be necessary. We also found that more detailed cost analysis of electrode materials is needed to support for future production and applications. When we apply the electrode to detect the real water samples, the anti-interference and electrochemical sensor componentization need further enhanced. Besides, although groundwater serves as the main or only source of drinking water in many areas, current studies on the electrochemical detection of groundwater pollutants are limited. We hope that this review will provide new ideas for the future development of electrochemical water contaminant sensors.

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New insights into the effect of pH on the mechanism of ofloxacin electrochemical detection in aqueous solution

Abstract: We first found that identifying the protonation status and polarity of the target pollutant helped to rapidly find an optimal pH condition for its electrochemical detection, which promoted practical application.

Cited by 36 publications

References 41 publications

Investigation of electrocatalytic and photocatalytic ability of Cu/Ni/TiO2/MWCNTs Nanocomposites for detection and degradation of antibiotic drug Furaltadone

Investigation of electrocatalytic and photocatalytic ability of Cu/Ni/TiO2/MWCNTs Nanocomposites for detection and degradation of antibiotic drug Furaltadone

Removal of Antibiotics from Real Hospital Wastewater by Cold Plasma Technique

Recent progress regarding electrochemical sensors for the detection of typical pollutants in water environments

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