Hydrothermal Synthesis of Cr2Se3 Hexagons for Sensitive and Low-level Detection of 4-Nitrophenol in Water

Abstract

We report a simple hydrothermal method used for the synthesis of Cr2Se3 hexagons (h-Cr2Se3) and its application towards electrochemical sensing of 4-nitrophenol (4-NP). The formation of h-Cr2Se3 was confirmed by using scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electrochemical activity of the h-Cr2Se3 modified screen-printed carbon electrode (SPCE) towards 4-NP was studied using cyclic voltammetry (CV) and amperometric i-t techniques. Typically, the obtained results were compared with those for a bare SPCE. The CV result clearly reveals that h-Cr2Se3 modified SPCE has higher catalytic activity towards reduction of 4-NP than bare SPCE. Hence, h-Cr2Se3 modified SPCE was concluded as a viable sensor for sensitive determination of 4-NP. Under optimized conditions, h-Cr2Se3 modified SPCE demonstrates the excellent capacity to detect the 4-NP in a linear range from 0.05 µM to 908.0 µM. The LOD and sensitivity in detection of 4-NP were determined at 0.01 µM and 1.24 µAµM−1 cm−2 respectively. The sensor is highly selective and stable and shows reproducible recovery of 4-NP in domestic supply and river water samples.

Structural and magnetic properties of molecular beam epitaxy grown chromium selenide thin films

“…Bulk crystal growth of Cr2Se3 has been achieved previously by various methods, e.g., ceramic method [6][7][8][9], solid state reaction method [10][11][12][13]16], soft chemical and hydrothermal synthesis [15,17,18] and chemical vapor transport method [4,14,[19][20][21]. Using MBE, here we have studied the growth of Cr2Se3 thin 111)-(7×7) substrates.…”

“…Previously, chromium selenide systems have been studied to investigate their suitability as thermoelectric material for intermediate-temperature applications [10][11][12][13][14], intermediate temperature power generation [13], electrochemical sensors [15], etc. Several groups have studied the structural, magnetic, electrical and thermoelectric properties of single crystal Cr2+xSe3-x compounds grown using solid state reaction method [10][11][12][13]16], soft chemical and hydrothermal synthesis [15,17,18] and chemical vapor transport method [4,14,[19][20][21]. However, the studies focus mostly on the improvement in thermoelectric properties of transition-metal-doped bulk samples of Cr2Se3.…”

Highly efficient and simultaneous catalytic reduction of multiple toxic dyes and nitrophenols waste water using highly active bimetallic PdO–NiO nanocomposite

“… Mixture of azo compounds Catalysts [Mixture] (mM) Volume of soln [NaBH 4 ] (M) Reaction time (min) Refs. 20 ml NP + MB + RhB + MO RGO/Co 40 ppm 80 ml 1.5 15 31 10 ml NP + MB + RhB + MO Co 3 O 4 /HNTS 10 ppm 3 ml 0.1 5 32 25 ml of 4-NP + DNP + TNP + MB + RhB + MO PdO–NiO NPs (Dye: 100 ppm; NP: 20 ppm) 150 ml 0.1 8 This work …”

A Review What Is Hydrothermal ?

“…Perkembangan teknologi dalam bidang material telah mengalami perkembangan yang sangat pesat dalam beberapa tahun terakhir (5). Banyak metode yang digunakan untuk pembuatan material ini, salah satunya menggunakan metode hydrothermal (6)(7)(8). Hydrothermal terbentuk dari kata hidro yang berarti air dan thermal yang berarti panas (9)(10)(11).…”