Chitosan/carbon/ZnMn₂O₄ nanocomposite for efficient removal of chromium(VI) and anionic/cationic dyes.

This work advances waste-to-resource circularity by transforming battery waste into an efficient sorbent, addressing mixed-pollutant challenges in industrial wastewater. An innovative mesoporous ternary chitosan/carbon/ZnMn₂O₄ nanocomposite (Cs/C/ZMO) was engineered through a two-step synthesis process for the removal of both anionic and cationic pollutants. First, zinc‑carbon battery waste was hydrothermally converted in ZnSO₄ solution to carbon/ZnMn₂O₄ (C/ZMO), followed by chitosan integration (1:2 wt/wt, respectively) via alkaline co-precipitation and epichlorohydrin crosslinking.

Efficient catalytic reduction of methylene blue and p-Nitrophenol by CuNP/hydrochar nanocomposites synthesized from organic peel waste.

The study enhances waste-to-resource circularity by transforming orange peel waste into an efficient biocatalyst for wastewater remediation. The excessive industrial use of methylene blue (MB) and p-nitrophenol (PNP) generates hazardous wastewater, posing significant risks to ecosystems and public health. To address this, a spherical copper nanoparticle-decorated hydrochar nanocomposite (CuNP/HC) was developed from orange peel waste via hydrothermal reduction.

Efficiency optimization of lead-free CHNHSnI-based perovskite solar cells through material and structural modifications.

This study focuses on optimizing the efficiency of lead-free perovskite solar cells (PSCs) using CHNHSnI as the active layer. Various modifications were investigated to enhance the performance of the PSCs. Key adjustments included the choice of polymer as a hole-transporting material (HTM), electrode materials, device structure, and the incorporation of a thin layer of nickel oxide (NiO) as a hole-selective layer (HSL).

Biosorbent silver nanoparticles decorated coffee-ground waste composite for cleaning water and antimicrobial applications.

A sustainable biosorbent, silver nanoparticles-decorated coffee-ground waste (CWAg), was synthesized through a simple in-situ reduction method. CWAg is extensively characterized via SEM-EDX, PZC, FTIR, XRD, HR-TEM, and XPS analyses. The biosorbent was tested to remove chromium (Cr(VI)) and methylene blue (MB) from wastewater, and its antibacterial properties was evaluated.