氨水浓度对果壳活性炭结构及性能的影响

采用氨水浸渍法对果壳活性炭进行改性处理，讨论不同氨水浓度（5%、10%、15%、20%）对果壳活性炭结构及性能的影响。采用场发射扫描电镜、比表面及孔径分析仪及紫外分光光度计对改性后的果壳活性炭结构及吸附性能进行研究。结果表明:氨水浓度对果壳活性炭的结构及吸附性能有显著影响，当氨水浓度为10%时，活性炭表面形态清晰，凹槽分布均匀，比表面积提高至775.1382m2/g，较改性前提高了6.5%；改性前后活性炭微孔孔径集中分布在3.5 nm；果壳活性炭的吸附率随氨水浓度的变化而变化，当氨水浓度为10%和15%时，吸附率分别达到86.51%和86.54%，吸附率相比改性前有所提高。而当氨水浓度进一步增加时，活性炭对苯酚的吸附率略微下降。

Effect of aqueous ammonia concentration on the structure and property of nut activated carbon

Fruit nut activated carbon was modified by immersion in aqueous ammonia. The effects of different ammonia concentrations (5%, 10%, 15%, 20%) on the structure and property of the nut activated carbon were investigated. Field emission scanning electron microscopy, surface area and pore size analyzer and UV spectrophotometer were applied to study the structure and adsorption property of the modified activated carbon. The results show that ammonia concentration has significant influences on the structure and adsorption property of the nut activated carbon. When the ammonia concentration is 10%, the surface morphology of the modified activated carbon is clear and the grooves are distributed uniformly. Compared with unmodified activated carbon, the specific surface area of the modified activated carbon is increased to 775.1382m2/g, which is increased by about 6.5%. The main pore size distributions of the modified and unmodified nut activated carbon are concentrated at 3.5nm. The adsorption rate of the modified nut activated carbon changes with the concentration of the ammonia. When the ammonia concentrations are 10% and 15%, the adsorption rates reach 86.51% and 86.54%, respectively. Compared to the unmodified nut activated carbon, the adsorption rate increases. When the ammonia concentration increases further, the adsorption rate of phenol on the nut activated carbon decreases slightly.