Catalytic degradation of Acid Orange 7 with hydrogen peroxide using CoxOy-N/GAC catalysts in a bicarbonate aqueous solution

The cobalt-based catalysts CoxOy-N/GAC were prepared by pyrolysis of a cobalt–phenanthroline complex on granular active carbon in nitrogen atmosphere, and tested for the degradation of Acid Orange 7 with H2O2 in a bicarbonate aqueous solution.

Phenol Removal from Aqueous Solution by Microwave Combined with Granular Active Carbon

The removal of phenol from aqueous solution was evaluated by using microwave technique assisted with active carbon. The effective factors such as the concentration of phenol , active carbon dosage, microwave power and irradiation time on the removal rate were investigated. When the concentration of phenol was 150 mg/l, active carbon dosage was 6 g/l, microwave power was 500 W, and irradiation time was 8 min, the removal ratio of phenol reached 95. 03%. The research on kinetics suggested that the process of treatment accords to the first-order reaction.

Study on Microwave Combined with Granular Active Carbon for Treatment of P-Nitrophenol Wastewater

A microwave technique assisted with granular active carbon(GAC) was used for the degradation of p-nitrophenol(PNP) wastewater. The effective factors such as the initial concentration of PNPl, active carbon dosage, microwave power and irradiation time on the degradation rate were studied. When the concentration of PNP was 200 mg/L, active carbon dosage was 6 g/L, microwave power was 500 W, and irradiation time was 8 min, the removal ratio of PNP reached 99. 03%. The concentration o f PNP could be decreased to be low 2 mg /L, which satisfied with the national first degree let out level. The results show that the technology can be a practical and effective method for treating PNP organic wastewater.

Study on Synergetic Catalytic Ozonation of Nitrobenzene in Nebulizing Systems

The removal effect of nitrobenzene (NB) in water by VUV/O3/GAC synergetic catalyzing method in a nebulizing system was studied. In addition, the effects of the droplet size, the nebulization height, O3 flux, free radical scavengers and active carbon usage frequencies on the degradation of NB were investigated. In this study, a spray nozzle that could produce 10-micrometer droplets were adopted, a UV lamp that emitted 185nm VUV light was used as the light source and a layer of 0.5cm granular active carbon was laid at the bottom of the experimental apparatus. The results showed that, in the apparatus, when the NB concentration in deionized water was 200mg/L, the nebulization height was 1.3m, O3 flux was 150mg/L, the removal rate of NB reached 95.3%. Supercarbonate acted as a catalyst in the system.