A Application of activated alumina in environmental science Li Guodong/Books (Class 02 (2), Environmental Science, School of Chemistry and Environment, South China Normal University, 022424429, Guangzhou, 510006) Abstract: The properties and preparation of activated alumina are introduced, and its application in environmental science is described, especially the treatment of fluorine-containing wastewater is introduced in detail.
Appearance of activated alumina: Activated alumina is a white spherical porous particle with uniform particle size, smooth surface, high mechanical strength, strong hygroscopicity, unswollen and uncracked after absorbing water, non-toxic, odorless, insoluble in water, ethanol, has strong adsorption to fluorine, and is mainly used for fluoride removal of drinking water in high fluoride areas.
Activated alumina is made by heating and dehydration of aluminum hydrate. Its properties depend on the structural state of the initial hydroxide. Generally, it is not pure Al2O3, but a partially hydrated amorphous porous structure material, in which there are not only amorphous gels, but also hydroxide crystals.
Potassium permanganate is often used in the laboratory as an oxidant and to produce oxygen. When heating potassium permanganate, remember to put a ball of cotton at the mouth of the test tube, not only to prevent potassium permanganate powder from entering and blocking the catheter, but also to prevent the resulting oxygen from being discharged well. When collecting oxygen, you can use the drainage method or the upward air method. 制取氧气 实验室里经常会将高锰酸钾用作氧化剂和制取氧气。将高锰酸钾加热，记得在试管口放一团棉花，不仅是防止高锰酸钾粉末进入并堵塞导管，也是使制得的氧气无法较好排出。收集氧气时，可以用排水法，也可以用向上排空气法。
The solid catalyst used in heterogeneous catalytic reaction is usually composed of three parts: active component and cocatalyst, that is, catalyst carrier. The active component plays a decisive role in the activity of the catalyst. Cocatalyst can improve the active agent selectivity of the catalyst. The catalyst carrier mainly carries the active component and cocatalyst to improve the physical properties of the catalyst.
In the learning process of high school chemistry, we often encounter potassium permanganate, especially using its strong oxidation to write unfamiliar ion equations, which is almost the oxidant with the highest frequency. This is because potassium permanganate itself is widely used. For example, in industry, potassium permanganate is used as a water treatment agent in water purification or wastewater treatment to oxidize H2S, iron, manganese, organic pollutants in water to control odor and decolorization. Therefore, potassium permanganate is often used in industry as a bleach, adsorbent, disinfectant, etc.