Low-Grade Waste Heat Recovery Via an Osmotic Heat Engine by Using a Freestanding Graphene Oxide Membrane

Overview

Journal ACS Omega

Publisher American Chemical Society

Specialty Chemistry

Date 2019 Aug 29

PMID 31458206

Citations 1

Authors

Xin Tong

Xin Wang

Su Liu

Haiping Gao

Runlong Hao

Yongsheng Chen

Affiliations

Soon will be listed here.

Abstract

The osmotic heat engine represents a new and promising technology for the harvesting of low-grade waste heat from various sources. However, the lack of an adequate semipermeable membrane hinders the technology's advancement. In this study, we investigated the application of a freestanding graphene oxide membrane (GOM) for energy generation in an osmotic heat engine. The synthesized GOM has a water permeability coefficient of 4.4 L m h bar (LMH-bar). The internal concentration polarization in the osmosis filtration system can be minimized because no membrane support layer is needed for the freestanding GOM. As a result, high water flux and high power density are obtained. For example, under an applied hydraulic pressure of 6.90 bar, with a 2 M draw solution of ammonium bicarbonate solution, a power density of 20.0 W/m is achieved. This study shows that the freestanding GOM is promising for application in the osmotic heat engine. Future research regarding improving the mechanical properties and water stability of the GOM is beneficial for further advancing the technology.

Citing Articles

Recent developments in solar-powered membrane distillation for sustainable desalination.

Jawed A, Nassar L, Hegab H, van der Merwe R, Al Marzooqi F, Banat F Heliyon. 2024; 10(11):e31656.

PMID: 38828351 PMC: 11140715. DOI: 10.1016/j.heliyon.2024.e31656.

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