摘要
以十八烷基三氯硅烷(OTS)和十二烷酸(LA)为改性剂,采用液相浸渍和热处理相结合方式对废旧活性炭进行疏水改性和再生。将硅氧烷和饱和脂肪酸中的非极性有机长碳链通过化学键接枝在活性炭表面以提高其疏水性能,并经热再生恢复活性炭被堵塞的孔道。结果表明:再生疏水活性炭具有较高比表面积(834.75 m^(2)·g^(-1))、良好的疏水性能(水接触角为135°)和耐酸碱性能,活性炭改性后对水包油(甲苯)乳液的吸附分离效率由42.58%(未改性活性炭)提高至92.07%。再生疏水活性炭与尼龙有机滤膜组成的复合过滤膜对油(甲苯)包水乳液的纯化分离效率由51.76%(未改性活性炭)提高至91.44%,复合过滤膜经10次循环使用后分离效率仍高于91%。
Octadecyltrichlorosilane(OTS)and dodecanoic acid(LA)were used as modifiers to conduct hydrophobic modification of waste activated carbon by liquid impregnation and heat treatment.The non-polar organic carbon chains in siloxane and saturated fatty acid were grafted onto the surface of activated carbon by chemical bonds to improve its hydrophobic properties,and the blocked pores of activated carbon were recovered by thermal regeneration.The results show that the regenerated-hydrophobic activated carbon has a high specific surface area(834.75 m^(2)·g^(-1)),good hydrophobic performance(water contact angle is 135°)and acid/alkali resistance.The adsorption and separation efficiency of regenerated-hydrophobic activated carbon for toluene-in-water emulsion increases from 42.58%(unmodified activated carbon)to 92.07%.The purification and separation efficiency of water-in-toluene emulsion increases from 51.76%(unmodified activated carbon)to 91.44%by the hybrid filter membrane composed of regenerated-hydrophobic activated carbon and nylon organic filter membrane,and the separation efficiency is still higher than 91%after 10 cycles.
作者
张琼元
马海瑞
朱厚堃
李文丽
胡丹丹
陆江银
崔彦斌
ZHANG Qiongyuan;MA Hairui;ZHU Houkun;LI Wenli;HU Dandan;LU Jiangyin;CUI Yanbin(Key Laboratory of Oil&Gas Fine Chemicals of Ministry of Education,School of Chemistry Engineering and Technology,Xinjiang University,Urumqi 830046,China;State Key Laboratory of Multi-phase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;Xi’an Aerospace Propulsion Institute,Xi’an 710100,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2023年第2期169-178,共10页
Journal of Materials Engineering
基金
国家自然科学基金项目(22076189)。
关键词
活性炭
疏水改性
再生
比表面积
油水分离
activated carbon
hydrophobic modification
regeneration
specific surface area
oil-water separation
