The large amount of waste gas containing volatile organic compounds (VOCs) discharged from petrochemical sewage plants will cause air pollution and seriously endanger the safety of human beings and the ecological environment. In this paper, we proposed a photocatalytic oxidation degradation technique of VOCs and designed a photocatalytic reaction device loaded with TiO 2 / SnO 2 catalyst. Under UV light irradiation, there is an energy level difference in the conduction band between TiO 2 and SnO 2 , which makes the photogenerated electrons (e − ) migrate to SnO 2 and reduces the surface electron density of TiO 2 . Thus, the recombination of photogenerated electron−hole pairs (e − −h + ) is inhibited and the catalyst activity is improved. Meanwhile, the synergistic effect of the oxidation of hydroxyl radicals (•OH) and ozone greatly improves the conversion rate. In addition, in the industrial side line, by studying the influence of inlet gas volume, inlet gas concentration, and gas humidity (RH) on the conversion rate of the VOCs, we revealed the operation law of the photocatalytic technique in industrial applications. Under the best working conditions, the purification rate of the VOCs was as high as 92.73%. This technique can not only effectively avoid the damage to the environment caused by polluting VOCs but also promote the low-carbon and green development of enterprises in the industry.

No abstract

No abstract

No abstract

SO2 and NO emitted from marine ships have seriously polluted the regional environment. However, there is a lack of high-efficiency, small-size, and cost-effective technology with which these pollutants could be purified. Here, a gas cyclone–liquid jet absorption separator (GLAS) combined with NaClO solution was developed to remove SO2 and NO simultaneously. The high-speed gas that rotates in the GLAS forms a high-gravity field and vortex flow, and SO2 and NO were removed efficiently in a small GLAS. The effect of key operating parameters was well studied through the experiment, and the total mass transfer coefficient (K G a) was calculated. It was found that the removal efficiency increased with the absorbent flow rate and concentration, while it decreased with the gas flow rate and the initial SO2 and NO concentrations. Under the experimental conditions, the maximum removal efficiency for SO2 and NO was 99% and 93%, and the maximum K G a was 0.0559 and 0.0357 kmol·m–3·kPa–1·s–1, respectively, which were 10 times higher than that of traditional devices. Semiempirical equations were also developed to predict the mass transfer performance of desulfurization and denitrification by GLAS. The study indicates that GLAS combined with NaClO solution has great potential applications for marine ships.