Solar-enabled water remediation via recyclable carbon dot/hydrogel composites

Seema Singh, Nitzan Shauloff, Raz Jelinek

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Scarcity of clean water, due to population growth, global warming, and depletion of natural freshwater sources, is among the most formidable environmental challenges facing humanity. Accordingly, development of cost-effective and widely applicable technologies for water remediation and purification is extremely important and highly sought. We present a new strategy for water purification using a composite material comprising carbon dots (C-dots) encapsulated within a porous hydrogel. The hydrogel matrix allows significant water uptake, while the embedded C-dots constitute effective photothermal mediators, absorbing solar energy for enhanced water evaporation. The C-dots further bestowed greater thermal and mechanical stability to the hydrogel host. The C-dot/hydrogel composite exhibited good operating parameters, including a water evaporation rate of 1.4 kg m2 h-1 and solar-to-vapor conversion efficiency of 89%. It was applied for diverse water treatment applications, including water desalination and removal of heavy metal ions, detergents, and organic molecules from contaminated water. The C-dot/hydrogel construct is easily synthesized from inexpensive, biocompatible, and environmentally friendly building blocks, is recyclable, and may be employed in varied water purification applications.

Original languageEnglish
Pages (from-to)13186-13194
Number of pages9
JournalACS Sustainable Chemistry and Engineering
Volume7
Issue number15
DOIs
StatePublished - 5 Aug 2019

Keywords

  • Carbon dots
  • Carboxymethyl cellulose
  • Hydrogels
  • Water desalination
  • Water purification

ASJC Scopus subject areas

  • Chemistry (all)
  • Environmental Chemistry
  • Chemical Engineering (all)
  • Renewable Energy, Sustainability and the Environment

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