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以核桃壳为原料,采用氯化锌对其进行改性,制备高比面积微孔壳炭,研究了改性剂浓度、浸渍比、炭化温度和炭化时间等条件对改性壳炭吸附性能的影响。采用扫描电子显微镜、傅立叶红外光谱、比表面积等现代技术对改性壳炭表面微观结构、化学结构进行了分析。结果表明,制备改性壳炭的适宜工艺条件为:改性剂质量分数为40%,浸渍比为1:3,炭化温度为500℃,炭化时间为60 min。在该条件下制备的改性壳炭对Cr(Ⅵ)的去除率达到98.9%。表征结果表明:改性壳炭的BET比表面积高达192.840 m~2/g,平均孔径为6.46 nm,总孔容为0.623 cm~3/g;其表面存在O—H、C—O—C、C—O、C—H和N—H等官能团。
Walnut shell was used as raw material, zinc chloride was used to modify it to prepare microporous shell carbon with high specific area. The effects of modifier concentration, impregnation ratio, carbonization temperature and carbonization time on the adsorption properties of modified shell charcoal influences. The microstructure and chemical structure of modified shell carbon were analyzed by using scanning electron microscopy, Fourier transform infrared spectroscopy, specific surface area and other modern techniques. The results showed that the suitable technological conditions for the preparation of modified shell charcoal were as follows: the mass fraction of modifier was 40%, the impregnation ratio was 1: 3, the carbonization temperature was 500 ℃ and the carbonization time was 60 min. The Cr (Ⅵ) removal rate of modified shell charcoal prepared under this condition reached 98.9%. The results showed that the BET specific surface area of the modified charcoal was as high as 192.840 m 2 / g, the average pore size was 6.46 nm and the total pore volume was 0.623 cm 3 / g. O-H, C-O-C, C-O, C-H and N-H and other functional groups.