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861.
介质阻挡放电常压降解哈隆的研究 总被引:5,自引:0,他引:5
本文以介质阻挡放电的方式产生低温等离子体,利用低温等离子体技术成功地降解了常压状况下的气态CF2ClBr,CF2ClBr含量为0.6%的空气在放电10s的条件下,可使CF2ClBr达到95%的降解率。本文研究了常压状况下的CF2ClBr低温等离子体空间反应机理,以及CF2ClBr初妈压力,电场强度和外加气体分别对低温等离子体降解CF2ClBr的影响。 相似文献
862.
863.
864.
Di Zhang Rong Hou Wenbo Wang He Zhao 《Frontiers of Environmental Science & Engineering》2022,16(6):78
865.
Feng Hou Ting Zhang Yongzhen Peng Xiaoxin Cao Hongtao Pang Yanqing Shao Xianchun Lu Ju Yuan Xi Chen Jin Zhang 《Frontiers of Environmental Science & Engineering》2022,16(3):33
866.
Enhanced photocatalytic degradation of VOCs using Ln3+-TiO2 catalysts for indoor air purification 总被引:11,自引:0,他引:11
Two types of lanthanide ion-doped titanium dioxide (Ln3+-TiO2) catalysts including La3+-TiO2 and Nd3+-TiO2 were prepared by a sol-gel method. The effects of the lanthanide ion doping on the crystal structure, surface area, adsorption properties, pore size distribution, and surface chemical state of the catalysts were investigated by means of XRD, BET, and XPS. As results, the crystal size decreased significantly, while the specific surface area, t-plot total surface area, micropore volume, and the total pore volume increased owing to the lanthanide ion doping. The nitrogen adsorption-desorption isotherms of the catalysts showed that the N2 adsorption ability of the Ln3+-TiO2 catalysts was better than the TiO2 catalyst. Among them, the 0.7% Ln3+-TiO2 catalysts demonstrated the highest adsorption ability. The photocatalytic activity of the catalysts was investigated in the experiments of the photocatalytic degradation of benzene, toluene, ethylbenzene and o-xylene (BTEX) in a gaseous phase. The photocatalytic efficiency of the TiO2 catalysts with the lanthanide ion doping was remarkably enhanced by BTEX removal. The 1.2% Ln3+-TiO2 catalysts achieved the highest photocatalytic activity. The enhanced photodegradation of BTEX is possibly due to the improved adsorption ability and the enhanced electron-hole pairs separation due to the presence of Ti3+ on the surface of Ln3+-TiO2 catalysts and the electron transfer between the conduction band/defect level and lanthanide crystal field state. 相似文献
867.
以光催化降解苯酚为探针反应,通过正交实验,系统研究了胶液配比、涂覆次数和焙烧温度等条件对以溶胶-凝胶法分别在普通钠钙玻璃和磨砂玻璃上制备TiO2光催化性能的影响,并利用环境扫描电镜(ESEM)对TiO2催化膜形貌进行了分析。研究表明,在普通钠钙玻璃片上负载TiO2催化膜的影响因素主次顺序为:硝酸体积〉涂覆次数〉焙烧温度〉V乙醇∶V酞酸丁酯,在选定实验条件下的最优条件为:涂覆次数为4次;焙烧温度=450℃;V乙醇∶V酞酸丁酯∶V硝酸(1∶4):V水=400∶40∶1∶4。在磨砂玻璃片上负载TiO2催化膜的的影响因素主次顺序为:涂覆次数〉硝酸体积〉焙烧温度〉V乙醇:V酞酸丁酯,在选定实验条件下的最优条件为:涂覆次数为4次;焙烧温度=500℃;V乙醇∶V酞酸丁酯∶V硝酸(1∶4)∶V水=400∶40∶2∶4。通过扫描电镜可以观察到在普通钠钙玻璃片和磨砂玻璃片表面均附着一层白色的TiO2薄膜,颗粒粒径在100 nm左右。磨砂玻璃比普通钠钙玻璃负载更多的催化剂,磨砂玻璃基TiO2活性更高。磨砂玻璃是一种非常有前景的TiO2催化剂载体材料。 相似文献
868.
石油的开采、加工、输送及使用过程中,对大气、土壤、水体带来了严重污染,对土壤环境的危害尤为严重。植物修复以其处理成本低、吸收污染物的生物量大等优点已成为人们普遍能接受的去除污染物的首选技术。植物主要通过三种途径去除土壤中有机污染物,即植物直接吸收有机污染物;释放分泌物和酶,刺激根区微生物活性和生物转化作用;增强根区的矿化作用。植物修复石油烃污染土壤的影响因素有:环境条件、污染物的浓度和滞留时间、营养元素、表面活性剂、根系分布等。通过植物-微生物联合修复、机械-微生物-植物多技术联用等措施,可提高石油烃的降解率。 相似文献
869.
A method of direct contact membrane distillation (DCMD) with a self-made hollow polyvinylidene fluoride membrane was applied to prepare high concentration polyaluminum chloride (PACl) with high Alb content based on chemical synthesis. The permeate flux and Al species distribution were investigated. The experimental results showed that the permeate flux decreased from 14 to 6 kg/(m2·hr) at the end of the DCMD process, which can be mainly attributed to the formation of NaCl deposits on the membrane surface. The Alb content decreased slightly, only from 86.3% to 84.4%, when the DCMD experiment finished, correspondingly the Alc content increased slightly from 7.2% to 8.5%, and the Ala content remained at 7% during the whole DCMD process. A PACl with Alb content of 84% at total aluminum concentration 2.2 mol/L was successfully prepared by the chemical synthesis-DCMD method. 相似文献
870.
Fabrication and performance of PET mesh enhanced cellulose acetate membranes for forward osmosis 总被引:1,自引:0,他引:1
Polyethylene terephthalate mesh(PET) enhanced cellulose acetate membranes were fabricated via a phase inversion process. The membrane fabrication parameters that may affect the membrane performance were systematically evaluated including the concentration and temperature of the casting polymer solution and the temperature and time of the evaporation, coagulation and annealing processes. The water permeability and reverse salt flux were measured in forward osmosis(FO) mode for determination of the optimal membrane fabrication conditions. The optimal FO membrane shows a typical asymmetric sandwich structure with a mean thickness of about 148.2 μm. The performance of the optimal FO membrane was tested using 0.2 mol/L Na Cl as the feed solution and 1.5 mol/L glucose as the draw solution. The membrane displayed a water flux of 3.47 L/(m2·hr) and salt rejection of95.48% in FO mode. While in pressure retarded osmosis(PRO) mode, the water flux was4.74 L/(m2·hr) and salt rejection 96.03%. The high ratio of water flux in FO mode to that in PRO mode indicates that the fabricated membrane has a lower degree of internal concentration polarization than comparable membranes. 相似文献