烧结活性炭的制备及吸附性能研究

Preparation and Absorption Characteristics of SAC

摘要:

本文以椰壳制粉末活性炭（AC）为基料，聚乙烯（PE）为高分子粘结剂，采用热压烧结工艺制备烧结活性炭（Sintered Activated Carbon, SAC）。考察了原料质量组成比、热压时间和热压温度对SAC的密度、强度、微观结构的影响，原料的质量比对SAC的机械性能和吸附性能影响最大，随着粉末活性炭添加量的增加，SAC的比表面积迅速增加，而机械强度却降低，并得到了较佳的制备工艺为：原料比为3:1，热压温度150 ℃，压力为15 MPa，热处理时间30 min。同时通过对比原料AC和SAC对亚甲基蓝吸附行为及N2吸(脱)附曲线的测定，可知制备所得SAC的吸附行为与AC相似，可知PE作为制备烧结活性炭的一种新型粘结剂，在不过多地降低比表面积的前提下，大大地提高烧结活性炭的机械性能，使其能够长时间经受住水流和气流的冲击。

Abstract:

In this paper, sintered active carbon (SAC) was prepared by sintering cocoanut powdered activated carbon at certain temperature and high pressure using polyethylene as macromolecule binder. The effects of material ratio, time and sintered temperature on density, intensity and micro-structure of SAC were investigated. The ratio of PE to AC showed the greatest influence on the mechanical properties and adsorption properties of SAC. As the increase of the amount of active carbon, specific surface area of SAC increased rapidly, but the intensity decreased. The processing parameters were optimized by the single factor test as follows: AC：PE 3:1, 200 ℃, 15 MPa and 30 min. Analysis of MB and N2 adsorption property of SAC and AC showed that, there was no significant difference between the two materialsd. As a new binder for SAC, PE can improve the mechanical properties of SAC greatly, but decrease the surface area. The SAC samples were all have excellent mechanical properties.