Title : Hydrothermal development of magnetic hydrochar nanocomposite from pineapple leaves and its performance for Mn2 uptake and reuse in latent fingerprint detection
Abstract:
The transformation of biomass waste into reuse products gives a lasting solution to waste management and issues around pollution. This work fabricated a magnetic hydrochar nanohybrids from pineapple leaf waste using hydrothermal method, thereafter magnetization with iron oxides nanoparticles followed. The composite was characterized and applied in adsorption. It successfully removes Mn²⁺ ions from water solutions. Batch adsorption tests revealed a high adsorption capacity, with kinetics following a pseudo-second-order model and isotherms best fitting the Langmuir model. The material contains a wide surface area, several oxygen-containing functional groups, and magnetic separability, allowing for easy recovery and re-use. The Mn²⁺-loaded adsorbent was repurposed for latent fingerprint detection on various non-porous surfaces. The combination of manganese species with sweat residue resulted in significant ridge clarity and contrast. This dual application pollutant removal and forensic reuse emphasizes a new approach to integrated environmental and forensic material development. The work contributes to the field of smart and sustainable nanocomposites by providing a green solution for water purification and a value-added reuse pathway for discarded adsorbents that adheres to circular economy concepts.
Keywords: Adsorbent, hydrochar, hydrothermal,latent fingerprint and Magnetic.
