1. Department of ChemistryUniversity of California-Berkeley Berkeley CA 94720 USA
2. Materials Sciences DivisionLawrence Berkeley National LaboratoryKavli Energy NanoSciences Institute Berkeley CA 94720 USA
3. Department of Civil and Environmental EngineeringUniversity of California-Berkeley Berkeley CA 94720 USA
4. National Engineering Laboratory for Industrial Wastewater TreatmentEast China University of Science and Technology Shanghai 200237 China
5. UC Berkeley-KACST Joint Center of Excellence for Nanomaterials for Clean Energy ApplicationsKing Abdulaziz City for Science and Technology Riyadh 11442 Saudi Arabia