The photodegradation of triphenyltin chloride(TPT)in an acidic aqueous solution was studied using a microwave electrodeless UV lamp(206nm). Different initial concentration of TPT,irradiation time,initial pH and adding hydrogen peroxide influenced the degradation ratio of TPT. A weak acidic condition was preferred for the degradation of TPT. For 120mg·l-1 TPT at pH=2.0,the degradation ratio of TPT was nearly 89.4% after irradiation for 75min.The lower of the initial concentration of TPT,the higher of the degradation ratio. When added hydrogen peroxide in the solution of TPT,the degradation ratio reached 100% nearly. Based on the analysis of photoproduct for GC-MS,disscuss the degradation mechanism of TPT.

The photolysis of simulating low concentration of hydrogen sulfide malodorous gas was studied under UV irradiation emitted by self-made microwave discharge electrodeless lamps (i.e. microwave UV electrodeless mercury lamp (185/253.7 nm) and iodine lamp (178.3/180.1/183/184.4/187.6/206.2 nm)). Experiments results showed that the removal efficiency (eta H2S) of hydrogen sulfide was decreased with increasing initial H2S concentration and increased slightly with gas residence time; H2S removal efficiency was decreased dramatically with enlarged pipe diameter. Under the experimental conditions with pipe diameter of 36 mm, gas flow rate of 0.42 standard l s(-1), eta H2S was 52% with initial H2S concentration of 19.5 mg m(-3) by microwave mercury lamp, the absolute removal amount (ARA) was 4.30 microg s(-1), and energy yield (EY) was 77.3 mg kW h(-1); eta H2S was 56% with initial H2S concentration of 18.9 mg m(-3) by microwave iodine lamp, the ARA was 4.48 microg s(-1), and the EY was 80.5mg kW h(-1). The main photolysis product was confirmed to be SO4(2-) with IC.

Sulfur hexafluoride (SF6) is known as one of the most powerful greenhouse gases in the atmosphere. Reductive photodegradation of SF6 by styrene has been studied with the purpose of developing a novel remediation for sulfur hexafluoride pollution. Effects of reaction conditions on the destruction and removal efficiency (DRE) of SF6 are examined in this study. Both initial styrene-to-SF6 ratio and initial oxygen concentration exert a significant influence on DRE. SF6 removal efficiency reaches a maximum value at the initial styrene-to-SF6 ratio of 0.2. It is found that DRE increases with oxygen concentration over the range of 0 to 0.09 mol/m3 and then decreases with increasing oxygen concentration. When water vapor is fed into the gas mixture, DRE is slightly enhanced over the whole studied time scale. The X-ray Photoelectron Spectroscopy (XPS) analysis, together with gas chromatography-mass spectrometry (GC-MS) and Fourier Transform Infrared spectroscopy (FT-IR) analysis, prove that nearly all the initial fluorine residing in the gas phase is in the form of SiF4, whereas, the initial sulfur is deposited in the form of elemental sulfur, after photodegradation. Free from toxic byproducts, photodegradation in the presence of styrene may serve as a promising technique for SF6 abatement.

The reactions taking place in the mixed solution of biphenyl and nitrous acid after it was exposed to UV irradiation were studied in this research work. The transient species were identified with the nanosecond transient spectroscopic technique, and the final products were ascertained by GC-MS analysis. It was shown that the OH radical, generated by the direct photolysis of nitrous acid, would attack biphenyl molecule to form Bp-OH adduct with a rate constant of 9.5×109 L·mol−1·s−1. The Bp-OH adduct could either react with H+ or be oxidized by nitrous acid to form nitrosobiphenol. The reactions between biphenyl and nitrous acid under UV irradiation in atmospheric aqueous phase were therefore suggested to be one promising source of nitrocompounds in the environment.

Electrodeless UV lamps can overcome the limitations of conventional UV lamps in the fields of luminescent substance applied,UV intensity and service life.In this paper,electrodeless UV lamps with two different discharge types,microwave and dielectric barrier discharge,were introduced.A review was made on the current progress in researches on environmental pollution control using electrodeless UV lamps,and its development direction was suggested.

利用激光闪光光解瞬态吸收光谱及气相色谱-质谱联用（GC-MS）技术分别对HNO2与联苯水溶液经紫外光照射后发生的交叉反应的机理及最终产物进行了研究.结果表明,HNO2受355nm紫外光激发产生的·OH能够快速加合至联苯的苯环上形成Bp-OH加合物,其二级反应速率常数为9.5×109 L·mol-1·s-1.从动力学角度验证该加合物能够与H+发生反应,亦可被HNO2氧化为亚硝基联苯酚.故大气水体中的HNO2与联苯在紫外光照射下发生的交叉反应可能是环境中硝基化合物的来源之一.

The photodegradation of organic dye rhodamine B (RhB) in an aqueous solution was studied using a microwave electrodeless UV lamp (MWUVL). The 185 nm vacuum UV (VUV) intensity of the MWUVL amounted to 12% of the total UV output, about 1.7 times as high as that of the con ventional low-pressure mercury lamp. An acidic condition was preferred for the degradation of RhB. Precipitate was generated during RhB degradation when the initial concentration of RhB solution was above 60 mg · L−1. For 100 mg · L−1 RhB at pH 4.0, the mass of precipitate produced was nearly half of the initial amount of RhB in the solution after irradi ation for 75 min. The corresponding degradation ratio of RhB reached up to 99.4% and COD reduced 77.4%. The photo degradation of RhB is mainly achieved by direct photolysis of RhB by 185 nm and OH radical oxidation.

The photolysis of simulating carbon disulfide malodorous gas was studied under UV irradiation emitted by microwave electrodeless lamps. Experiments results show that the photolysis of carbon disulfide is determined by the initial concentration, residence time and gas humidity. When air velocity is 0.2 m/s, initial concentration is about 100 mg/m3, and gas humidity is about 40%, the conversion ratio of carbon disulfide can reach to 75% with microwave electrodeless mercury lamp and 50% with microwave electrodeless iodine lamp. The mechanism of carbon disulfide photolysis was further studied. It is concluded that the photolysis of carbon disulfide is probably a collective action of direct photolysis and *OH radical oxidation.

A novel technology for the preparation of lead dioxide(PbO_2) electrode was studied.The test by XRD,SEM and AAS indicated that this electrode had high activity in electrolysis as well as excellent corrosion resistance.The mechanism and process conditions of nitrobenzene degradation using the PbO_2 electrode were further studied.Compared to the graphite electrode,the PbO_2 electrode had an obviously higher COD_Cr removal rate of 65% after 5 hours of electrolysis.During electrolysis progress,the surface of PbO_2 anode is easy to generate hydroxyl radical due to high oxygen over-voltage of PbO_2 anode.The best applicable conditions of PbO_2 anode for nitrobenzene mass electrolysis are: nitrobenzene mass concentration 501.5 mg/L,electrode gap 3 cm,and solution pH 7.The results showed that the PbO_2 electrode had obvious superiority in COD_Cr removal,especially in the system with phosphate or chloride.But the nitrobenzene cannot be completely oxidized in the electrolysis process,due to the reduction action of the cathode.

A dual-plasma method for treating industrial waste gas features that a plasma power supply is used for the medium barrier discharge in two regions: ordinary-pressure gas discharge region A and low-pressure ultraviolet irradiation region for increasing the effect to remove pollutants. Its apparatus is composed of 3 quartz pipes with different diameters to form 2 discharge regions between them, and the internal and external electrodes. It can decrease the external voltage by 3000V.