Researchers from Japan have developed a photocatalytic reactor for a water purifier that does not require batteries. Rather than using an external power source to pump water through the reactor, the system uses diffusion and capillary action to achieve an entirely non-electric reactor.
In addition to water purification itself, it is also important to ensure a constant and efficient transfer of contaminated water into the reactor and clean water out. This is normally achieved by an electric or fuel pump, but in areas where the power supply is often disrupted or is scarce, another approach is needed.
Read the full article in Chemistry World
Link to journal article
Novel Photocatalytic Microreactor Bundle that does not Require an Electric Power Source
K Katayama, Y Takeda and S Kuwahara
Chem. Commun., 2012, DOI: 10.1039/c2cc33525e