不同活性炭陶瓷的吸附特性研究

Absorption Properties of Different Activated Carbon Ceramics

分别用椰壳、煤质与木质活性炭粉和硅藻土为主原料,经配料、成型、煅烧等工艺制备了活性炭-陶瓷复合材料。探讨不同条件制备的陶瓷材料的甲醛吸附特性及抗压强度、体积密度、气孔率等性能指标。用碘吸附值、SEM、BET等手段表征陶瓷材料的性能和微观形貌。结果确定最佳配方为椰壳活性炭30%,硅藻土70%,煅烧温度为800℃,制备的活性炭陶瓷的比表面达到290.72 m2/g,碘吸附值为352.14 mg/g,含炭率为25.46%。在环境温度为30℃时,24 h对甲醛的吸附效率达到8.3%。

Activated carbon ceramics were prepared by using diatomite and three different types of activated carbon powder as main materials followed by shaping and calcining processes.The formaldehyde absorption properties,bending strength,bulk density and porosity under different conditions were discussed.The iodine value,SEM,and BET techniques were used to investigate the microstructures and properties of ceramic materials.Results showed that activated ceramic materials exhibited excellent comprehensive properties when used 70% diatomite and 30% coconut shell activated carbon powder as carbon source and calcined at 800 ℃,as confirmed by the high specific surface area（290.72 m2/g）,iodine value（352.14 mg/g） and carbon content（25.46%）.Its formaldehyde absorption was up to 8.3% at 30 ℃ for 24 h.