Discovery News: http://news.discovery.com/tech/graphene-microbots-built-to-scour-water-of-heavy-metals-160412.htm
Phys.org: http://phys.org/news/2016-04-microbots-polluted.html
Huffington Post: http://www.huffingtonpost.com/entry/robot-microbots-lead-pollution_us_570bfacae4b014223249b65f?fmivtrda00b18xgvi
CNET News: http://www.cnet.com/news/graphene-microbots-slurp-lead-from-polluted-water/
PC Mag: http://www.pcmag.com/news/343667/how-graphene-and-microbots-can-clean-up-your-water
La Vanguardia: http://www.lavanguardia.com/ciencia/planeta-tierra/20160415/401123400246/nanotecnologia-microrobots-medio-ambiente.html
How Stuff Works: https://www.youtube.com/watch?v=cLtlS29UUZg
C&EN: https://amsocnanomed.org/files/www/CEN_-_Nanomotors_-_April_42c_2016.pdf
Scientific American: http://www.scientificamerican.com/podcast/episode/microbots-get-the-lead-out-of-wastewater/
http://news.xinhuanet.com/english/2016-04/30/c_135324082.htm
In German:
http://www.laborpraxis.vogel.de/wasseranalytik-umweltanalytik/articles/531996/?cmp=beleg-mail
http://www.process.vogel.de/graphenoxid-entfernt-blei-aus-wasser-a-531982/?cmp=beleg-mail
http://www.elektroniknet.de/automation/sonstiges/artikel/129932/
http://www.welt.de/print/die_welt/wissen/article155241496/Der-unsichtbare-Roboter.html
As a research highlight in Nature Nanotechnology:
http://www.nature.com/nnano/reshigh/2016/0516/full/nnano.2016.79.html