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.
Contaminated soils and sludge treatment plant - Case Study
Client: Ecosistem Group, Lamezia Terme (CZ) – Italy Challenge: to transform waste into product! The Client possesses a large plant for the treatment of products contaminated with hazardous substances and materials, recycling of recovered materials and disposal of non-recyclable waste, which is considered highly innovative and technologically advanced in the field of environmental protection. Solution: Design and production of a plant for the treatment of contaminated soils and muds by Baioni’s...
S.sensing Matrix System, Kurita’s difference in equipment!
Kurita launched a new modular analyzer system, especially designed for cooling water applications. This integrated system with its range of different controllers and analyzers allows to fit S.sensing MX to practically any application and need. At the same time it is only installed what is really needed at the customer site. The selection of analyzers are based on the real needs: There are analyzers available for Kurita product active as well as for KPI measurement. Therefore S.sensing MX gives double safety - to...
Determination of Selected ASTM Perfluorinated Compounds (PFCs) Using LC-MS/MS
ASTM methods D7968-14 and D7979-15 are used to determine the same list of PFCs but in different matrices. ASTM method D7968-14 lists soil as a matrix while ASTM method 7979-15 lists water, sludge, influent, effluent and waste water as matrix options. These methods use different extraction techniques but both evaluate the samples by liquid chromatography/tandem mass spectrometry (LC/MS/MS). We evaluated the instrumental portion of the methods using the Shimadzu LCMS-8060 triple quadrupole mass spectrometer....
Hg removal and the effects of coexisting metals in forward osmosis and membrane distillation
In this study, we investigate the rejection of Hg, Cd, and Pb and the effect of coexisting metals on Hg removal through forward osmosis (FO) and membrane distillation (MD) in order to establish a more effective water treatment process. The results of our laboratory experiment indicate that more than 97% of the rejection for each metal is achieved through the FO system, and this rejection is the highest among previous studies using membrane filtrations. Moreover, we examine the matrix effect of the coexisting Cd...
Nanobite Treated Contaminated Water – Fit to Drink! - Case study
In 2010 the US Environmental Protection Agency, US Coast guard and BP Oil company invited Unirem Incorporated, the manufacturer of Nanobite Powder, to do an encapsulation test on crude oil polluted waters in the Gulf of Mexico. Nanobite Powder is the European trade name for a bio-remediation accelerator known in the USA as PRP (Petroleum Remediation Product). Nanobite Powder was developed by NASA scientists and is an award winning product. It is made from powdered bees wax spheres, and is designed to absorb and...