Room-temperature synthesis of zinc oxide nanoparticles in different media and their application in cyanide photodegradation
1 Petrochemicals Research Institute, King Abdulaziz City for Science and Technology (KACST), P.O. Box 6086, Riyadh 11442, Saudi Arabia
2 Sustainable Energy Technologies (SET) Center, College of Engineering, King Saudi University, P.O. BOX 800, Riyadh 11421, Saudi Arabia
3 Institute of Chemistry, University of Rostock, Albert-Einstein-Strasse 3a, Rostock D-18059, Germany
Nanoscale Research Letters 2013, 8:516 doi:10.1186/1556-276X-8-516Published: 6 December 2013
Cyanide is an extreme hazard and extensively found in the wastes of refinery, coke plant, and metal plating industries. A simple, fast, cost-effective, room-temperature wet chemical route, based on cyclohexylamine, for synthesizing zinc oxide nanoparticles in aqueous and enthanolic media was established and tested for the photodegradation of cyanide ions. Particles of polyhedra morphology were obtained for zinc oxide, prepared in ethanol (ZnOE), while spherical and some chunky particles were observed for zinc oxide, prepared in water (ZnOW). The morphology was crucial in enhancing the cyanide ion photocatalytic degradation efficiency of ZnOE by a factor of 1.5 in comparison to the efficiency of ZnOW at an equivalent concentration of 0.02 wt.% ZnO. Increasing the concentration wt.% of ZnOE from 0.01 to 0.09 led to an increase in the photocatalytic degradation efficiency from 85% to almost 100% after 180 min and a doubling of the first-order rate constant (k).