改性球形活性炭对氨气吸附性能的研究

Study on adsorption performance of modified spherical activated carbon for ammonia

研究了不同金属盐溶液浸渍改性的球形活性炭对氨气的吸附性能以及同种浸渍剂的最佳浸渍比。采用扫描电镜、透射电镜、X射线衍射仪、康塔吸附仪探究了不同浸渍比对浸渍炭样品的表面形貌、物相结构及孔径分布的影响。通过固定床吸附装置对基炭和浸渍炭进行了氨气吸附性能的研究。结果表明:浸渍剂种类对氨气吸附效果有很大影响,同等浸渍条件下,氯化钴浸渍的活性炭具有最优氨气吸附效果,氯化钴浸渍比为50%的样品对氨气的吸附量最高,可达54.05 mg/mL,为基炭的37倍。对吸附氨气后样品的物化性质进行分析以及程序升温脱附表征,结果表明氯化钴与氨气反应生成了[Co(NH_(3))_(6)]Cl_(3)。

The adsorption performance of spherical activated carbon impregnated with different metal salt solutions for ammonia and the optimal ratio of the same impregnant were studied.The influence of different impregnation ratio on the surface morphology,phase structure and pore size distribution on impregnated carbon samples were investigated by scanning electron microscopy,transmission electron microscopy,X-ray diffraction and Quanta adsorption instrument.The adsorption performance of the unmodified carbon and impregnated carbon for ammonia was studied by the fixed bed adsorption device.The results showed that the type of impregnant had a great influence on the adsorption performance of ammonia.Under the same impregnation conditions,the activated carbon impregnated with cobalt chloride had the best adsorption performance for ammonia.The sample with 50%impregnation ratio of cobalt chloride had the highest ammonia adsorption capacity up to 54.05 mg/mL,which was37 times of the unmodified carbon.The physicochemical properties and temperature programmed desorption characteristics of the samples after ammonia adsorption were analyzed.The results showed that[Co(NH_(3))_(6)]Cl_(3) was formed by the reaction of cobalt chloride with ammonia.