Light-driven generation of H2O2 only from water and molecular oxygen could be an ideal pathway for clean production of solar fuels. In this work, a mixed metal oxide/graphitic-C3N4 (MMO@C3N4) composite was synthesized as a dual-functional photocatalyst for both water oxidation and oxygen reduction to generate H2O2. The MMO was derived from a NiFe-layered double hydroxide (LDH) precursor for obtaining a high dispersion of metal oxides on the surface of the C3N4 matrix. The C3N4 is in the graphitic phase and the main crystalline phase in MMO is cubic NiO. The XPS analyses revealed the doping of Fe3+ in the dominant NiO phase and the existence of surface defects in the C3N4 matrix. The formation and decomposition kinetics of H2O2 on the MMO@C3N4 and the control samples, including bare MMO, C3N4 matrix, Ni- or Fe-loaded C3N4 and a simple mixture of MMO and C3N4, were investigated. The MMO@C3N4 composite produced 63 μmol L−1 of H2O2 in 90 min in acidic solution (pH 3) and exhibited a significantly higher rate of production for H2O2 relative to the control samples. The positive shift of the valence band in the composite and the enhanced water oxidation catalysis by incorporating the MMO improved the light-induced hole collection relative to the bare C3N4 and resulted in the enhanced H2O2 formation. The positively shifted conduction band in the composite also improved the selectivity of the two-electron reduction of molecular oxygen to H2O2.
Analox partner Azote attend leading Trade Show Foodtech Packtech
Azote Industrial Gas Solutions, based in New Zealand, provide on-site nitrogen and oxygen generators across a wide range of applications and will be attending this year’s renowned FoodTech PackTech (FTPT) exhibition in Auckland from 18th – 20th September. The 3 day event hosted at ASB Showgrounds, Auckland is New Zealand’s largest food manufacturing, packaging and processing technology trade show. Free to attend, the show has been running every other year for more than 20 years and expects to...
Nitrogen Safety in the Lab
This blog explains why nitrogen gas generators are the safest way to supply nitrogen to your instrumentation and why they pose no danger, in terms of changing atmospheric levels of nitrogen or oxygen. The biggest danger to lab personnel is a rapid depletion of oxygen levels in the lab. Once the level of oxygen reduces to A nitrogen gas generator producing 32LPM of nitrogen would take over 20 minutes to produce 675L and over 1hr to produce 2250L of nitrogen. The 32LPM produced would at worst increase nitrogen...
Stanford Researchers Link Aquifer Overdraft to Arsenic Contamination
In a recent study, researchers used satellite data to establish a link between excessive pumping from California aquifers and dangerous arsenic concentration spikes in the groundwater of the Tulare Basin. This promises to be an important early warning system for the growing problem of arsenic contamination, which potentially threatens drinking water for more than a million people. Arsenic cannot be detected by our senses but has been implicated as a causative agent in heart disease, diabetes, and cancer. The...
Maximizing Boiler Performance - Case Study
Combustion and the Significance of Unburned Fuel Combustion takes place when fuel reacts with oxygen to produce energy in the form of heat. The energy generated when fuel is burned is used in the operation of a variety of equipment, including boilers, furnaces, kilns, and engines. In addition to heat, CO2 (carbon dioxide) and H20 (water) are created as byproducts of the chemical reaction. Optimal combustion occurs when energy from the burning of fuels is harnessed in the most efficient way possible through...
What happens to whisky in the bottle?
With the second ever International Scotch Day being held on the 8th of February, we thought we`d take a look at a little bit of science in relation to whisky - the old bottle effect (OBE). The whisky professor at scotchwhisky.com has provided some insight into the old bottle effect and the different effect it has on whisky to wine. Old Bottle Effect is, in short, the idea that beverages flavor changes in the bottle over time - oxidization of the liquid in the bottle is most commonly thought to be the cause. In...