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This study investigates the effectiveness of water hyacinth-derived biochar in removing As(V) from low-concentration aqueous solutions, similar to groundwater, and examines the impact of elevated NO3− concentrations. Biochar was produced by pyrolyzing water hyacinth at 550 °C for 2h and subsequently modified with KOH and FeCl3 solutions. The modified biochar was characterized and employed in adsorption experiments to examine the factors influencing the adsorption process and its kinetics for As(V). Findings indicated that biochar modified with Fe showcased a robust adsorption capacity across a broad pH range of 3–10. The adsorption equilibrium was attained within 1h. The adsorption kinetics were aptly described by the pseudo-first-order kinetic model, and the Freundlich isotherm adsorption model was found suitable for characterizing the adsorption process for As(V) using biochar. The equilibrium adsorption capacity, as predicted by the pseudo-first-order kinetic model, was 203 μg g−1 at pH 7. The presence of nitrate ions had a negligible impact on As(V) adsorption. The material demonstrated the capability for reuse up to three times for As(V) removal.

Marine microorganisms still belong to untapped natural resources and can harness a rich source of lipase enzymes with the potential industrial applications. Thraustochytrids are heterotrophic fungus like protists that can dissolve organic matters via enzymes. It has been less explored so far. Lipase is one of the most widely used enzymes, crucial to many biotechnological and industrial processes, including the food, paper, and oleochemical industries, as well as in applications related to pharmaceuticals. However, its application is relatively expensive and challenging due to its instability and aqueous solubility. Immobilization is a commonly employed strategy to enhance lipase activity, and it has proven to be a successful approach. In comparison to free lipase, immobilized lipase on nanomaterials (NMs) has demonstrated superior properties, including greater pH and temperature stability, a longer stable duration, and the ability to be recycled. However, under specific circumstances, protein loading is comparatively decreased and lipase immobilization on NMs might also occasionally result in activity loss. The overall performance of immobilized lipase is influenced by the NMs types and properties. This review addresses thraustochytrids potential for lipase production, emerging extraction techniques employing nanomaterials, and the significance of various techniques for lipase immobilization. The immobilized lipases' potential for several applications has also been taken into account. [ABSTRACT FROM AUTHOR]

Marine polysaccharide degrading enzymes are pivotal for catalyzing glycosidic linkages' breakdown in polysaccharides, yielding low-degree oligosaccharides and monosaccharides. These enzymes show substantial potential in diverse biotechnological applications. Marine polysaccharides and their derivatives exhibit anti-inflammatory, antiviral, anticoagulant, and anticancer properties, and are used in food additives with potential health benefits such as prebiotic oligosaccharides. Research explores pharmaceutical applications of marine polysaccharide degrading enzymes, including novel drug delivery and therapeutic bioactive oligosaccharide production. These enzymes are crucial for depolymerizing marine polysaccharides, providing energy and nutrients to microorganisms, and contributing to nutrient cycling and ecological balance. The breakdown of marine polysaccharides is vital for the global carbon cycle and helps regulate atmospheric carbon dioxide levels, impacting environmental sustainability. This comprehensive review delves into marine polysaccharide degrading enzymes, emphasizing carrageenase, agarase, chitinase, chitosanase and alginate lyase. Challenges such as low yields, poor stability, and high costs prompt solutions through metabolic engineering, enzyme immobilization, and engineering, enhancing resistance and efficiency. These advancements amplify the value of marine polysaccharidedegrading enzymes in biotechnological and environmental contexts. [ABSTRACT FROM AUTHOR]