废弃姜杆制备活性炭及其吸附性能研究

Preparation of Adsorption Behavior Characterization of Activated Carbon by Discard Ginger Stem

以农业废弃物姜杆为原料,KOH作为活化试剂,制备活性炭。研究了碱处理工艺、炭化温度、碱炭比、活化剂种类等因素对活性炭吸附性能的影响。实验结果表明:以KOH作为活化剂制备出的活性炭比表面积较好,较佳的炭化温度为700℃,活化时间为6h,碱∶姜杆比例为4∶1。湿法活化比干法工艺制备的活性炭,吸附性能更好,其比表面积可达151.1500m^2/g。用红外光谱、X射线扫描、BET对活性炭的性能进行了表征。活性炭经过研磨、酸洗水洗之后,再经过硝酸或者醋酸改性,比表面有了很大程度的提高,达到了790.0993 m^2/g。

Activated carbon was prepared using ginger stem,an agricultural waste,as feedstock as well as KOH and Na OH as activating reagents. The effect of the carbonization temperature,the carbon-alkali ratio,and the activator type on the performance of active carbon adsorption were studied. The experimental results showed that： the performance of activated carbon prepared with KOH as activator presented higher surface area. Optimized conditions were： carbonization temperature 700℃,activation time 6 h,alkali-ginger stem ratio 4∶ 1. The activated carbon prepared by wet processing showed better adsorption performance than that by dry processing. The specific surface area reached 151. 1500 m^2/g. The performance of the activated carbon was characterized by FT-IR,X-ray diffraction,SEM,and BET. The surface area reached 790. 10 m^2/g after grinding,pickling bath,and nitric acid or acetic acid modification.