光催化废气处理技术
Photocatalytic oxidation characteristics: (1) photocatalytic oxidation at room temperature for the complete oxidation of the waste gas is odorless, non-toxic harmless substance for treatment of high concentration, broad-minded, strong stability of the exhaust gas treating toxic and harmful gases. (2) effectively clean thoroughly: By photocatalytic oxidation directly in the air stinking waste gas is completely oxidized to non-toxic substances, without leaving any secondary pollution, (3) Green Energy: Photocatalytic oxidation using artificial UV lamp wave generated vacuum ultraviolet light as an energy source to activate the catalyst to drive oxidation - reduction reaction, and the photocatalyst is not consumed during the reaction, the use of oxygen in the air as the oxidant, effectively degrade toxic hazardous waste, odorless gas become photocatalytic maximum energy saving features. (4) strong oxidation: Semiconductor photocatalytic oxidation has strong characteristics of certain organic ozone is difficult to oxidize such as chloroform, carbon tetrachloride, hexachlorobenzene, can be decomposed efficiently, and therefore have a special significance for the degradation of organic matter is difficult, light effective catalytic oxidizer is hydroxyl radicals (OH-) and superoxide anion radical (O2-, 0-), which is higher than the common ozone oxidation, hydrogen peroxide, potassium permanganate, such as hypochlorous acid. (5) broad spectrum: Photocatalytic oxidation of organic matter from many types of hydrocarbons to carboxylic acids are effective, even for atoms such as halogenated organic compounds, dyes, nitrogen-containing organic compounds, organophosphorus pesticides also have a good removal effect after a certain time, as long as the reaction can be completely purified. (6) Long life: theoretically, the photocatalyst life is infinitely long, without replacement.
Light catalytic exhaust gas treatment technology principle: The use of TiO2 as a photocatalytic process catalyst, mild reaction conditions, photolysis quickly, the product is CO2 and H2O or other, and wide range of applications, including hydrocarbons, alcohols, aldehydes, ketones, ammonia and other organic matter , it can be cleared by TiO2 photocatalysis. Its mechanism is a photocatalyst titanium dioxide absorbed photons produce hydroxyl radical (· OH) and reactive oxygen species (· O, H2O2) and water reaction surface, wherein the hydroxyl radical (· OH) is a photocatalytic reaction mainly active substances, photocatalysis oxidation play a decisive role. The reaction of hydroxyl radicals with a 120kJ / mol of energy is higher than the bond energy of various types of organic matter, such as: CC (83kJ / mol), CH (99 kJ / mol), CN (73kJ / mol), CO (84kJ / mol ), HO (111kJ / mol), NH (93 kJ / mol), which can quickly and effectively break down organic compounds and volatile organic compounds composed of bacteria, along with other reactive oxygen species (· O, H2O2) synergy, its bactericidal effect more rapidly.
Light catalytic exhaust gas treatment technology is mainly used to generate chemical waste smell gas companies, printing and dyeing, pharmaceutical, alcohol plants, feed plants, sewage treatment plants, waste disposal stations, garbage power plants exhaust gas purification. 光催化氧化的特点: （1）光催化氧化适合在常温下将废臭气体完全氧化成无毒无害的物质，适合处理高浓度、气量大、稳定性强的有毒有害气体的废气处理。
（2）有效净化彻底：
通过光催化氧化可直接将空气中的废臭气体完全氧化成无毒无害的物质，不留任何二次污染，
（3）绿色能源：
光催化氧化利用人工紫外线灯管产生的真空波紫外光作为能源来活化光催化剂，驱动氧化—还原反应，而且光催化剂在反应过程中并不消耗，利用空气中的氧作为氧化剂，有效地降解有毒有害废臭气体成为光催化节约能源的最大特点。
（4）氧化性强：
半导体光催化具有氧化性强的特点，对臭氧难以氧化的某些有机物如三氯甲烷、四氯化炭、六氯苯、都能有效地加以分解，所以对难以降解的有机物具有特别意义，光催化的有效氧化剂是羟基自由基（OH-）和超氧离子自由基（O2-、0-），其氧化性高于常见的臭氧、双氧水、高锰酸钾、次氯酸等。
（5）广谱性：
光催化氧化对从烃到羧酸的种类众多有机物都有效，即使对原子有机物如卤代烃、染料、含氮有机物、有机磷杀虫剂也有很好的去除效果，只要经过一定时间的反应可达到完全净化。
（6）寿命长：在理论上，光催化剂的寿命是无限长的，无需更换。
光催化废气处理技术原理：是利用TiO2作为催化剂的光催化过程，反应条件温和，光解迅速，产物为CO2和H2O或其它，而且适用范围广，包括烃、醇、醛、酮、氨等有机物，都能通过TiO2光催化清除。其机理主要是光催化剂二氧化钛吸收光子，与表面的水反应产生羟基自由基(·OH)和活性氧物质（·O，H2O2），其中羟基自由基(·OH)是光催化反应的一种主要的活性物质，对光催化氧化起决定作用。羟基自由基具有120kJ/mol的反应能，高于有机物中的各类化学键能，如：C-C(83kJ/mol)，C-H(99 kJ/mol)，C-N(73kJ/mol)，C-O (84kJ/mol)，H-O (111kJ/mol)，N-H(93 kJ/mol)，因而能迅速有效地分解挥发性有机物和构成细菌的有机物，再加上其它活性氧物质(·O，H2O2)的协同作用，其杀菌效果更为迅速。
光催化废气处理技术主要适用于化工厂 、印染厂、制药厂、酒精厂、饲料厂、污水处理厂、垃圾处理站、垃圾发电厂等产生废臭气体的企业进行废气净化。 |
