摘要
对活性炭进行改性,增加其表面酸性基团含量,提高活性炭对氨(NH3)的吸附量,以强化活性炭-NH3工质对的吸附制冷过程。筛选了活性炭改性试剂,考察改性工艺条件对表面基团含量的影响;用红外光谱和扫描电镜对改性前后活性炭进行表征;测定活性炭对NH3吸附量。结果表明:HNO3改性可显著增加活性炭表面酸性基团含量;HNO3改性活性炭较为适宜条件为:HNO3浓度4 mol/L,温度20℃,时间12 h;改性后活性炭表面酸性基团含量提高3.5倍,碘值降低9.2%,对NH3吸附量提高了36.98%。
Modification of activated carbon could increase the content of surface acid functional groups and NH3 adsorption capacity,which would strengthen adsorption refrigeration process using activated carbon-NH3 working pairs.Modification reagents were screened out.The effects of modification conditions on the content of superficial groups were investigated.Superficial microstructure of modified activated carbon was analyzed by FT-IR and SEM.Adsorption capacity of NH3 on activated carbon was measured.The results show that nitric acid modification can obviously increase surface acid functional groups of activated carbon.The feasible modification conditions are： concentration of nitric acid 4 mol/L,temperature 20 ℃,modification time 12 h.Compared to the original sample,the acidic functional groups content of activated carbon increased 3.5 times,adsorption capacity for NH3 increased 36.98 % while iodine value decreased 9.20 % after nitric acid modification.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2010年第5期35-39,共5页
Chemistry and Industry of Forest Products
基金
国家自然科学基金资助项目(20876074)
关键词
活性炭
吸附
氨
表面基团
activated carbon
adsorption
NH3
functional groups
