Water vapor mass transfer in alginate–graphite bio-based hydrogel for atmospheric water harvesting

Vincenzo Gentile, Matteo Calò, Michael Bozlar, Marco Simonetti, Forrest Meggers

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

This study presents experimental and theoretical investigations on water vapor mass transfer of a novel hydrogel compound based on alginate and graphite. This hydrogel enables rapid, reproducible, and thermally driven cycles for the adsorption and desorption of water vapor from ambient air for atmospheric water harvesting applications. We study the impacts of hydrogel composition on sorption capacity and kinetics using sorption/regeneration experiments under various environmental conditions. Theoretical models based on Fick's law of diffusion and Linear Driving Force are developed and validated with experiments to optimize thermal cycling conditions within the temperature range of 20–100 °C. The bio-based hydrogel exhibited remarkable water uptake, ranging from 0.5 to 0.9 g/g, with RH below 30 and 50 %, respectively. This low-humidity setting enables a water production rate of 1.6–2.9 L/kg of sorbent per day with a low-grade thermal regeneration (60–100 °C). Natural graphite microparticles improve water vapor release kinetics during regeneration, with an effective diffusivity coefficient of around 10−11 m²/s.

Original languageEnglish (US)
Article number124794
JournalInternational Journal of Heat and Mass Transfer
Volume219
DOIs
StatePublished - Feb 2024

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Keywords

  • Alginate hydrogel
  • Atmospheric water harvesting
  • Biopolymer
  • Diffusion kinetics
  • Optimal thermal cycle
  • Water vapor diffusion

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