Enhanced visible light-mediated photocatalysis, antibacterial functions and fabrication of a 3-chlorophenol sensor based on ternary Ag₂O·SrO·CaO

Abstract

A novel multi-metal oxide nanocomposite, Ag 2 O$SrO$CaO, was synthesized by a facile co-precipitation method followed by calcinations. The synthesized nanocomposite was characterized by XRD, FESEM, EDS, TEM, FTIR spectroscopy and photoluminescence (PL) spectroscopy. The composite showed enhanced photocatalytic activity under visible light irradiation and excellent anti-bacterial performance against both Gram-positive and Gram-negative bacteria. Here, the synthesized Ag 2 O$SrO$CaO nanomaterials were deposited on a glassy carbon electrode (GCE) in the form of a thin film to fabricate the desired electrochemical sensor and subjected to I-V analysis of 3-chlorophenol (3-CP) in a phosphate buffer solution (PBS). A calibration curve was plotted from the linear relation of current versus concentration and used to calculate the sensitivity (8.9684 mA mM À1 cm À2 ), linear dynamic range (LDR, 0.1 nM to 0.01 mM) and lower limit of detection (DL, 97.12 AE 4.86 pM). The analytical parameters of the sensor such as response time, reproducibility and long-term stability in the detection of 3-CP were reliable. Finally, it was used to analyze real samples collected from various environmental sources and found to be acceptable.

Photocatalysis, photoinduced enhanced anti-bacterial functions and development of a selective m-tolyl hydrazine sensor based on mixed Ag·NiMn2O4 nanomaterials

“…The end application of an electrochemical sensor should be the detection of real samples collected from various environmental sources. [50][51][52][60][61][62] Therefore, the assembled sensor based on Ag$NiMn 2 O 4 nanomaterial/binder/GCE was applied to analyze a number of samples obtained from various environmental sources, such as a PC baby bottle, PC water bottle, industrial waste effluent, and PVC food packaging bag; the resulting data obtained by applying the recovery method are summarized in Table 4. As illustrated in Table 4, the data were deemed to be quite acceptable.…”

“…The calcinations converted the carbonates of the sample into their oxides. 51,52 Three different single metal oxides (Ag 2 O, NiO and MnO) were also synthesized by the same method. All these oxides were calcined at 950 C. The reactions of the Ag$NiMn 2 O 4 synthesis can be summarized as below: For size analysis, a Williamson-Hall plot (eqn (1)) was used; the particle size was estimated to be 58.3 nm, where the standard deviation (ESD) of the peak tting is 0.00039 ( Fig.…”

“…Finally, the study indicated that trimetallic oxide nanocomposites are promising candidates for photocatalytic applications and environmental protection due to their nanostructure formation and perturbations of electronic energy levels. 51,52,[60][61][62] Anti-bacterial activity of the Ag$NiMn 2 O 4 nanocomposite…”

“…In summary, the self-assembled nanostructured material, Ag$NiMn 2 O 4 , is expected to be applied as an efficient antibacterial agent against MDR bacteria as well as an industrial sterilization system. 51,[60][61][62] Electrochemical analysis of the Ag$NiMn 2 O 4 nanomaterials/ binder/GCE Fabrication of GCE with Ag$NiMn 2 O 4 nanomaterials using Naon. The electrochemical response of the desired sensor is dependent on the precision of the fabrication of GCE with the Ag$NiMn 2 O 4 nanomaterial, and attention must be paid to the modication process of GCE.…”

Development of an ultra-sensitive para-nitrophenol sensor using tri-metallic oxide MoO2·Fe3O4·CuO nanocomposites

“…This study was conducted to synthesize and characterize a tri-metal oxide from single metal oxides of interest, for exploring electrochemical sensor applications, because trimetallic oxide nanocomposites are promising systems for toxin sensors, photocatalytic applications and environmental safety, an efficient anti-bacterial agent against MDR bacteria, and industrial sterilization mediators. [12][13][14][15][16] Phenolic compounds and their derivatives are extensively used in the production of pharmaceuticals, dyes, pesticides, etc., and are known as severe environmental toxins. 17,18 They cause severe damage to organisms and plants.…”