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对一种原料半焦进行粉碎、筛分,取其中10～20目的颗粒;用去离子水冲洗后高温下烘干至恒重;依次进行HNO3活化、KOH活化和加压水热化学活化,制备出活性半焦吸附剂。经实验证明,该活性半焦吸附剂对甲苯的吸附等温线符合Langmuir模型,其甲苯吸附容量可达207 mg/g,穿透时间由80 min延长至235 min。该活性半焦吸附剂的比表面积为555.56 m2/g,碘值为811.38 mg/g,表面酸碱总量为0.8649 mmol/g,并通过SEM扫描进行了表面微观形态分析。数据表明,经改性后制备出的新型活性半焦对甲苯的去除率明显增加,其表面物化性质也有明显改变,是一种优良的有机废气吸附剂。
Pulverizing and sieving a semi-coke of a raw material, taking 10 to 20 mesh particles therein; washing with deionized water and drying to constant weight at high temperature; sequentially performing HNO3 activation, KOH activation and pressurized hydrothermal chemical activation to prepare Active semi-coke adsorbent. The experimental proves that the adsorption isotherm of toluene on the active semi-coke adsorbent accords with Langmuir model. The adsorption capacity of toluene is up to 207 mg / g and the breakthrough time is extended from 80 min to 235 min. The specific surface area of the active semi-coke adsorbent was 555.56 m2 / g, the iodine value was 811.38 mg / g and the total amount of acid and alkali on the surface was 0.8649 mmol / g. The surface micro-morphology was analyzed by SEM. The data show that the modified semi-coke produced after the modification of the toluene removal efficiency increased significantly, the surface properties of the material also has significantly changed, is an excellent organic waste gas adsorbent.