Method for preparing bamboo charcoal with controllable aperture

Abstract

The invention relates to a method for preparing bamboo charcoal with a controllable aperture. The method comprises the following steps: cutting bamboo, selecting a middle section of cut bamboo which is more than 1m above the ground for drying treatment, controlling the water content of the bamboo to be less than 20%, placing the bamboo in a high-temperature furnace, feeding high-purity nitrogen or argon into the high-temperature furnace at a flowing rate of more than 5L / min to carry out deoxidization, then, raising the temperature of the high-temperature furnace to 400-1,500 DEG C at a speed of 3-40 DEG C / min, charring at the constant temperature for 1 to 8h, naturally cooling the high-temperature furnace to the room temperature after the thermal decomposition and the charring are finished, taking the product out and grinding, controlling the fineness of the product to be more than 20 meshes, and modifying the pore structure to obtain the bamboo charcoal with the controllable aperture. Compared with the prior art, the method is simple in preparation process, can effectively reduce the production cost by pressure maintaining and charring and effectively improve the adsorption capability of the bamboo charcoal by adopting the pore structure modification; moreover, the prepared bamboo charcoal can be suitable for application scenarios of different adsorbates, and is wide in application range.

Description

technical field [0001] The invention belongs to the technical field of material science and relates to a method for preparing bamboo charcoal with controllable aperture. Background technique [0002] Bamboo charcoal is a porous material with relatively high porosity obtained by thermally decomposing bamboo under high temperature and anoxic conditions (or limited access to oxygen). Bamboo charcoal is a typical porous material, which has different pore types such as micropores, mesopores and macropores. This rich pore distribution makes bamboo charcoal have superior adsorption characteristics, and it is effective for harmful gases, water vapor and organic waste in wastewater. Pollutants and heavy metal ions have good adsorption characteristics. According to the Polanyi-Dubinin potential energy theory, when the pore diameter of the adsorbent is as large as the diameter of several molecules of the adsorbate, the potential energy fields of the opposite pore walls will superimpos...

AI Technical Summary

Problems solved by technology

Although the preparation process disclosed by this patent is relatively simple and can reduce the preparation cost of activated carbon in the past, in the preparation method of bamboo charcoal, nitrogen gas needs to be introduced during the whole process from heating up to carbonization and down to room temperature, and the preparation cost is relatively low. Higher, and the bamboo charcoal prepared by this patent only has good adsorption properties for such adsorbents as mercaptans, thioethers, and heavy metal ions, and does not necessarily have good adsorption properties for other adsorbates, and the scope of application is limited.