磷酸法竹质活性炭的制备及其二次活化处理的研究

Phosphoric Acid Method Preparation of Bamboo Activated Carbon and Its’ Secondary Activation

通过磷酸活化法将毛竹废料制备成活性炭,再利用硝酸钴高温分解的氧化钴来对其二次活化改性。考察了其制备和改性工艺。研究确定活性炭的最佳制备条件为:磷酸浓度80%,浸渍比为6∶17 g/g,活化时间为2.5 h,活化温度为550℃,产品对亚甲基蓝溶液的脱色力值为650 mL/g。活性炭的适宜改性条件为:用质量分数为7.5%的硝酸钴水溶液按1.5∶5 g/mL浸渍比浸渍改性90 min,并在400℃焙烧3 h。产品对亚甲基蓝溶液的脱色力值为1 150 mL/g,与未改性产品相比较,提高了76.92%。

Bamboo waste was made into activated carbon by phosphoric acid activation method, and then the modified activated carbon was preparated with cobalt oxide which was from nitric acid cobalt＇ s high temperature decomposition. The results of the study showed that： The optimum preparing conditions of activated carbon were as follows ： phosphoric acid concentration was 80%, impregnated than for 6：17 （ g/g）, activation time of 2. 5 h, acti- vation temperature of 550℃ and obtained activated carbon＇ s decolorization ability of methylene blue solution was 650 mL/g. The optimum conditions of the modification of activated carbon were as follows： impregnation ratio of 1.5：5 g/mL , mass fraction of cobalt nitrate aqueous was 7.5 %, modification time was 90 min and calcined at 400 ℃ for 3 h. The modified activated carbon＇s decolorization ability of methylene blue solution was 1 150 mL/g, in- creased by 76.92% comparing with the unmodified products.