Pharmaceutical contamination is an emerging environmental concern that threatens global health and impacts every hemisphere of existence. The extensive exploitation and unregulated release of these chemical pollutants challenge environmental sustainability and call for their immediate detection and remediation. This study discusses the electrochemical determination of the antiprotozoal drug (dimetridazole), which is banned in numerous places owing to suspicions of it being carcinogenic, using a 2D/2D heterojunction. The detrimental outcomes of the drug demonstrate the significance of its effective detection and the development of suitable materials for the sensing application. The deep eutectic solvent-based fabrication of Ni–Fe layered double hydroxide nanosheets/sulfur-doped graphitic carbon nitride heterostructure features the green and ecologically benign synthesis of the compound with remarkable properties. The conjunction of hierarchical structures offers synergistic quantum confinement effects and confines charge carriers promoting abundant active sites. The improved electrocatalytic activity of the proposed drug sensor reinforces its perspectives by exhibiting higher sensitivity, wide linear-range responses (0.008–110.77 μM), a lower limit of detection (1.6 nM), appreciable stability, and higher selectivity. Analysis of real samples with the developed electrocatalyst underpins its practical applications in the real world. The development of superior architectures with lower energy requirements and minimal byproducts marks the superior characteristics of the synthesis methodology within the guidelines of green chemistry.

The desire for long driving range and low cost of electric vehicles necessitates the use of superior rechargeable lithium batteries. These batteries with enhanced energy density addresses the demand for cutting‐edge cathode materials which can deliver amplified voltage and capacity. Lithium‐rich manganese is one among such promising cathodes for lithium‐ion batteries. In this work, three different organic acids, including oxalic (OX), tartaric (TA) and ascorbic (AS) acids were used to synthesis Li [Li0.2Ni0.3Mn0.7] O2 (LNMO) materials with three unique microstructures. Physicochemical and electrochemical characterization techniques were used to investigate a range of properties. Electrochemical investigations demonstrated regulated morphology‐enhanced electronic conductivity, increased energy density and prolonged cycle behavior. Among the three samples, AS‐LNMO unveiled a capacity of 308.02 mhAg−1 nearing the value of theoretical capacity. Whereas, TA‐LNMO exhibited a remarkable stability even after 200 cycles with capacity retention of 99.3%. With specific discharge capacities of 308.02, 278, 252, 228 and 212 mAhg−1 at 0.1C, 0.2C, 0.5C, 1C and 2C respectively, AS‐LNMO exhibited superior rate capability. Collectively, this research offers valuable insights in using complexing agents which positively impacts the morphology and electrochemical performance of LNMOs in upcoming lithium‐ion batteries.

The untreated discharge of industrial dyes into water supplies is a likely occurrence that can cause a number of dangerous scenarios that are hazardous for the ecology. Herein, a simple hydrothermal strategy for synthesizing copper-doped titanium dioxide nanoparticles (Cu-TiO2) were presented and investigated its ability to photocatalytically degrade dyes e.g. reactive black 5 (RB5), red 198 (RR198) and yellow 145 dyes (RY145). Firstly, the as-synthesized Cu-TiO2 nanoparticles were characterized using powder X-ray diffraction (PXRD), UV-diffuse reflectance spectroscopy (UV-DRS), high resolution-scanning electron microscopy (HR-SEM) and transmission electron microscopy (TEM) techniques. Furthermore, the photocatalysis experiments were conducted using three reactive dye solutions at different concentrations, pH, duration, etc. The spherulitic Cu-TiO2 photocatalyst exhibited superior catalytic activity against the dyes and was able to achieve 82, 88 and 90% efficiencies for RB5, RR198 and RY145 dyes, respectively. The kinetics and the reusability parameters were also elaborated with respect to the obtained results. Therefore, Cu-TiO2 spherulites are professed to be effectual photocatalyst materials for industrial scale dye degradation.

Hierarchical nanostructured activated carbon electrode material was prepared from the used-coffee grounds to fabricate a cost-effective, scalable and high-performance symmetric supercapacitor. The interconnected, disordered and microporous material was synthesized in a simple two-stage method of chemical activation with zinc chloride followed by direct pyrolysis of the coffee grounds at 900 ºC in nitrogen atmosphere. The N2 adsorption and desorption analysis showed that the prepared material had an extraordinary surface area of ~1178 m2 g-1. The fabricated symmetric supercapacitor device in non-aqueous tetraethylammonium tetrafluoroborate (TEABF4) electrolyte exhibited 2.7 V cell voltage with superior specific capacitance, energy and power density of 129 F g–1, 56.4 Wh kg–1 and 797.9 W kg–1, respectively. Besides, it also had a high specific capacitance retention of 99% even after 10,000 cycles. This work demonstrated an effective approach to transform coffee grounds into high performance electrode material for renewable energy devices. The observed electrochemical performance evidently showed that the materials derived from waste coffee grounds could be recycled into potential electrode material for supercapacitors. The cost-effectiveness and abundance of waste coffee grounds combined with the simple activation process and high performance of the synthesized material increased its feasibility for commercial applications in energy storage devices.