Enhanced sensing of hazardous 4-nitrophenol by a graphene oxide–TiO<sub>2</sub> composite: environmental pollutant monitoring applications

Nehru, Raja; Gopi, Praveen Kumar

doi:10.1039/c9nj06176b

Cited by 52 publications

(26 citation statements)

References 63 publications

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“…The electrochemical methods include Cyclicvoltammetry, Linear Sweep Voltammetry, Differential Pulse Voltammetry, Square Wave Voltammetry (SWV), Amperometry and Impedance Spectroscopy and all of these methods have been used for the detection of 4-NPh. Different nanomaterials have been classified for the electrocatalytic reduction of 4-NPh as shown in Table 1 [88][89][90][91][92][93][94][95][96][97][98][99][100][101][102].…”

Section: Different Modified Electrodes For 4-nphmentioning

confidence: 99%

“…Electrochemical procedures have reported the electrodeposition of GO on GCE surface and formation of electrochemical reduction graphene oxide (ERGO) films is exhibited as crumpled, wrinkled and flake-like shapes [87][88][89][90]. In recent years, researchers have improved the stability and sensitivity of modified ERGO on GCE films, which can be used to enhance electrochemical sensors [116][117][118][119][120][121].…”

Section: Electrochemical Sensors Of 4-nph By Using Graphene Materialsmentioning

confidence: 99%

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Electrochemical Detection of 4-Nitrophenol by Using Graphene Based Nanocomposite Modified Glassy Carbon Electrodes: A Mini Review

Prabakaran

Pillay

2021

Nanoarchitectonics

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This article describes the fabrication of electrochemical devices for the detection of a key environmental pollutant, 4-Nitrophenol (4-NPh). 4-NPh is a requirement for the synthesis of organophosphate pesticides. These pesticides are mostly used in the agricultural sector to obtain a high yield of agricultural products. The use of 4-NPh in the agricultural field results in poisonous levels of this compound in the soil and water. Different techniques have been used for its transformation by biological and chemical degradation. However, these strategies not only created highly toxic pollutant but also need fast operation and time consuming processes. In this background, we have reported a broad and efficient review of the electrochemical reduction of 4-NPh as a feasible alternate method. In this review paper, graphene oxide (GO), reduced graphene oxide (rGO), N-doped graphene oxide, functionalized graphene oxide, metallic nanoparticles coated graphene oxide, metal oxides covered on rGO, polymer functionalized graphene oxide and hybrids materials functionalized with graphene oxide (hydroxyl apatite and β-cyclodextrin) which have been fabricated on a glassy carbon electrode (GCE) to enhance the electrocatalytic reduction and increase the sensor activity of 4-NPh are discussed. We have also described the effects of a few interfering phenolic pollutants such as aminophenol, hydroquinone, o-nitrophenol (o-NPh), trinitrotoluene, trinitrophenol, 2, 4-dinitrophenol (4-DNPh) and nitrobenzene. In the paper, easy and more effective electrochemical methods for the detection of 4-NPh with graphene- based nanocomposites modified on GCE for 4-NPh detection are summarized and discussed.

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Section: Different Modified Electrodes For 4-nphmentioning

confidence: 99%

Section: Electrochemical Sensors Of 4-nph By Using Graphene Materialsmentioning

confidence: 99%

Electrochemical Detection of 4-Nitrophenol by Using Graphene Based Nanocomposite Modified Glassy Carbon Electrodes: A Mini Review

Prabakaran

Pillay

2021

Nanoarchitectonics

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“…48 Herein, the numerical optimization found a point that maximizes the desirability function in 4-NP degradation. For example, the criteria set for the 3 factors in the range including contact time (10-90 minutes), pH of the solution (3)(4)(5)(6)(7)(8), and initial 4-NP concentration (10-30 mg/L) and 96.08% maximum degradation of 4-NP were found to be the maximum desirability. Figure 6 shows ramp desirability that was generated from 100 optimum points via numerical optimization.…”

Section: Optimization Of 4-np Degradation Using Rsm-bbdmentioning

confidence: 99%

“…Conversely, 4-NP is one of the hazardous chemicals affecting both human and animal health. 4,5 The Agency for Toxic Substances and Disease Registry (ATSDR) of the United States designated 4-NP as one of the 114 organic compounds listed, which poses a great danger to living organisms in the environment. 6 Hence, 4-NP needs to be removed from wastewater before being discharged into the environment.…”

Section: Introductionmentioning

confidence: 99%

RSM-BBD Optimization of Fenton-Like Degradation of 4-Nitrophenol Using Magnetite Impregnated Kaolin

Belachew

Fekadu

Abebe

2020

Air, Soil and Water Research

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In this work, we have reported a low-cost and environmentally friendly Fe3O4-modified activated kaolin (AK-Fe3O4) composite for efficient Fenton-like degradation of 4-nitrophenol (4-NP) and optimization of the degradation variables. The AK-Fe3O4 composites were characterized by Fourier transform infrared spectroscopy, powder x-ray diffraction, scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). X-ray diffraction confirms the syntheses of pure phases of Fe3O4 and AK-Fe3O4. The SEM image of the AK-Fe3O4 composite reveals the formation of a highly porous surface. The room temperature VSM analysis describes the superparamagnetic nature of AK-Fe3O4 composites with 25 emu/g magnetization values. Response surface methodology coupled with Box-Behnken design was used to optimize the 4-NP degradation (%) variables such as contact time (10-90 minutes), 4-NP concentration (10-30 mg/L), and pH (3-8). The high regression value ( R² = 0.9964 and adjusted R² = 0.9917) and analysis of variance ( P < .0001) show that the quadratic model can sufficiently explain the 4-NP degradation (%). The optimum 4-NP degradation was found to be 96.01% ± 1.89% using 1 mg/mL of AK-Fe3O4, 20 mg/L of 4-NP, 97.9 mmol/L of H2O2, and pH of 3 at the end of 75 minutes of reaction time. Moreover, the catalyst shows good recyclability and stability after 5 successive degradations of 4-NP. In general, a low-cost and magnetically separable AK-Fe3O4 composite is an effective Fenton-like catalyst for the degradation of 4-NP.

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“…In the last decade, transition metal oxides and their composites with carbon materials were used as electrode materials for 4‐NP sensing [6, 7]. In recent years, transition metal chalcogenides are attracting great research interest in electrochemistry because of their high electrochemical surface area, low charge transfer resistance, and stability.…”

Section: Introductionmentioning

confidence: 99%

MoS₂ Nanosheets Decorated Multi‐walled Carbon Nanotube Composite Electrocatalyst for 4‐Nitrophenol Detection and Hydrogen Evolution Reaction

et al. 2020

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Various kinds of electrocatalysts have been widely investigated for the reduction of organic pollutants and the production of clean energy resources. Therefore, cost‐effective and stable electrocatalysts are need of the hour. Herein, we synthesized molybdenum disulfide (MoS2) decorated multi‐walled carbon nanotubes (MWCNTs) composite using a hydrothermal method for efficient hydrogen production and electrochemical detection of 4‐nitrophenol (4‐NP). X‐ray diffraction and Raman analysis confirmed the successful formation of the MWCNTs/MoS2 composite. SEM images showed that the pristine MoS2 exhibited a flower‐like morphology with an average particle diameter of 3 μm. Transmission electron microscopy proved that the MoS2 nanosheets were decorated on the MWCNTs surface. The composite showed good performance in terms of electrochemical reduction of 4‐NP in 0.1 M phosphate buffer (pH 7.0). The linear sweep voltammetric response of the composite electrode for sensing of 4‐NP exhibited a linear relation with the concentration range of 0.75–71 μM and a low detection limit of 0.47 μM. The composite electrode showed high sensitivity (1.67 μA/μM/cm2), good stability, and excellent selectivity. The MWCNTs/MoS2 composite exhibited superior electrocatalytic activity in the hydrogen evolution reaction relative to the MoS2 catalyst. The composite coated carbon cloth showed a low overpotential of 211 mV for hydrogen evolution in 0.5 M H2SO4. The electrocatalyst split water into hydrogen up to 22 h with a Tafel slope of 136 mV/dec.

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Enhanced sensing of hazardous 4-nitrophenol by a graphene oxide–TiO₂ composite: environmental pollutant monitoring applications

Abstract: The accurate detection of hazardous 4-nitrophenol (4-NP) is deemed essential for the environment and human health.

Cited by 52 publications

References 63 publications

Electrochemical Detection of 4-Nitrophenol by Using Graphene Based Nanocomposite Modified Glassy Carbon Electrodes: A Mini Review

Electrochemical Detection of 4-Nitrophenol by Using Graphene Based Nanocomposite Modified Glassy Carbon Electrodes: A Mini Review

RSM-BBD Optimization of Fenton-Like Degradation of 4-Nitrophenol Using Magnetite Impregnated Kaolin

MoS₂ Nanosheets Decorated Multi‐walled Carbon Nanotube Composite Electrocatalyst for 4‐Nitrophenol Detection and Hydrogen Evolution Reaction

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Enhanced sensing of hazardous 4-nitrophenol by a graphene oxide–TiO2 composite: environmental pollutant monitoring applications

Abstract: The accurate detection of hazardous 4-nitrophenol (4-NP) is deemed essential for the environment and human health.

Cited by 52 publications

References 63 publications

Electrochemical Detection of 4-Nitrophenol by Using Graphene Based Nanocomposite Modified Glassy Carbon Electrodes: A Mini Review

Electrochemical Detection of 4-Nitrophenol by Using Graphene Based Nanocomposite Modified Glassy Carbon Electrodes: A Mini Review

RSM-BBD Optimization of Fenton-Like Degradation of 4-Nitrophenol Using Magnetite Impregnated Kaolin

MoS2 Nanosheets Decorated Multi‐walled Carbon Nanotube Composite Electrocatalyst for 4‐Nitrophenol Detection and Hydrogen Evolution Reaction

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Product

Resources

About

Enhanced sensing of hazardous 4-nitrophenol by a graphene oxide–TiO₂ composite: environmental pollutant monitoring applications

MoS₂ Nanosheets Decorated Multi‐walled Carbon Nanotube Composite Electrocatalyst for 4‐Nitrophenol Detection and Hydrogen Evolution Reaction