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.
Hubei Sanning Chemical joint stock company was formerly known as Zhijiang County Chemical Fertilizer Factory, which was founded in 1970. In 1993, it was restructured into a state-controlled joint stock company as a pilot project. In 2001, it passed the "two replacement" reform and became a private enterprise. In 2007, a state-owned super-large enterprise - Shanxi Jincheng Anthracite Mining Group Co., Ltd. took control. The company is a national high-tech enterprise, China's top 200 chemical enterprises, China's top 50 chemical fertilizers and China's top 100 chemical fertilizer brands. It is one of the top 100 private vanguard enterprises in Hubei Province through train enterprises, top 100 industrial enterprises, and one of the 100 private vanguard enterprises that focus on support and development. The best growth enterprise, the best private enterprise, and the A-level taxpayer in Hubei Province.
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。
Data shows that China is the world's largest producer of alumina, with a production capacity of more than 43.5 million tons per year under construction and under construction, of which the production capacity for processing domestic bauxite is 32.5 million tons per year. In 2018, the national alumina output 48.96 million tons, making it the world's largest producer of alumina. The demand for alumina is also increasing year by year. So, what exactly is alumina?
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.
Activated alumina is a porous adsorbent with high adsorption activity due to its large specific surface area, so it is widely used as a carrier for efficient adsorbents and various catalysts. Activated alumina not only has a large specific surface area, but also has great mechanical strength, physicochemical stability, high temperature resistance and corrosion resistance, but it is not suitable for operation under strong acid and alkali.