Application Of High-efficient Nanocatalysts In Rapid Food Contaminant Detection And Food Wastewater’s Energy Reuse

Carbon and precious metals based nanomaterials have been widely applied in catalysis and environmental analysis on account of their excellent catalytic activities. Moreover, their excellent electron-transfer characteristics, making them much concerned in energy-catalysis and electroanalysis. This paper is focused on designing and recombining either carbon and precious metal nanomaterials, or different dimensional carbon nanomaterials to synthesize two kinds of graphene-based nanocatalysts. The main research content and conclusions are as follows.1. Synthesis of graphene-Au nanorods based electrocatalysts and its application in fast electrochemical detection of methyl parathion. For the first time, we attempted to adopt electrostatic self-assembly to synthesize graphene-Au nanorods based catalyst and found its enhanced catalytic reduction activity toward methyl parathion. Taking advantage of this nature, an electrochemical sensing platform was developed to sensitively and selectively detect methyl parathion.2. Construction of an electroanalytical platform toward bisphenol S based on electrochemically co-reduced GO-C60 nanocatalyst. Here, we proposed a simple and clever scheme to recombine graphene oxide and fullerene by grinding and electrochemical co-reduction. This catalyst shows excellent catalytic oxidation activity toward bisphenol S. On account of this, an electrochemical sensing platform based on this catalyst was applied in the fast detection of bisphenol S. The detection limit of BPS is 0.5 μM. Moreover, this sensor can also cater for the detection in real samples like milk with an acceptable recovery.3. One-step synthesis of three-dimensional nickel sulfide loaded Ni foam catalyst used for efficient water electrolysis in 1.0 M KOH. This catalyst shows excellent catalytic activity toward both the HER and OER. When integrated in a two-electrode system, this bifunctional catalyst presents a highly catalytic activity for the full water splitting with achieving 10 mA cm-2 at a cell voltage of only 1.64 V in food alkaline wastewater, which realizes the effective combination of food wastewater treatment and hydrogen energy conversion.