The second issue of Greensusmater in 2025 brings together innovative research at the intersection of materials science, environmental sustainability, and nanotechnology. This edition highlights how materials design and modification can enhance performance in diverse applications—ranging from wastewater treatment to energy storage. This volume features studies on tailoring crystallinity and magnetism of SiO₂@NiZnFe₂O₄ nanoparticles via thermal annealing, hydrogel synthesis from natural taro starch using a freeze-thaw method, and eco-friendly carbon dots synthesized from plant extracts. Additionally, readers will find advanced investigations on niobium-doped BiVO₄ for photocatalytic degradation of antibiotics and dyes, as well as molybdenum-doped Nb₂O₅ electrodes for high-performance supercapacitors. Together, these contributions reinforce the journal's commitment to green, functional, and sustainable materials research.