正丁醇/丙酸与腐殖酸相互作用的NMR研究  

Interactions Between n-Butanol/Propionic Acid and Humic Acid Studied by NMR Spectroscopy

作　　者：张书怀 马慧 郭朝晖 马敏珺 乔岩[1,2] 王英雄 ZHANG Shu-huai;MA Hui;GUO Zhao-hui;MA Min-jun;QIAO Yan;WANG Ying-xiong(Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院山西煤炭化学研究所,山西太原030001 [2]中国科学院大学材料与光电研究中心,北京100049

出　　处：《波谱学杂志》2021年第3期301-312,共12页Chinese Journal of Magnetic Resonance

基　　金：国家自然科学基金资助项目(U1710106).

摘　　要：由于制备液体燃料的费托合成工艺在合成过程中排放的费托反应生成水通常含有水溶性含氧化合物,例如醇、醛、酮和羧酸.费托反应生成水酸性强、成分复杂、种类繁多,因此需处理后才能排放.本文以核磁共振(NMR)为主要技术手段,以正丁醇和丙酸作为费托反应生成水中水溶性有机成分的模型化合物,研究了腐殖酸(HA)对费托反应生成水的吸附作用.1H NMR滴定实验和^(1)H弛豫时间测定结果显示:随HA浓度增大,正丁醇质子信号变宽,但化学位移未变;丙酸质子信号变宽,且化学位移向高场移动;正丁醇和丙酸的^(1)H自旋-晶格和自旋-自旋弛豫时间均降低,分子相关时间增大.HA与正丁醇、丙酸的结合百分比表明HA对正丁醇的吸附作用大于丙酸.增加HA浓度有利于HA与正丁醇相互作用,但溶液pH值对HA(20 mg/mL)与正丁醇相互作用影响较小;另一方面,增加HA浓度、降低溶液pH值均有利于HA与丙酸相互作用,且HA浓度对相互作用的影响高于溶液pH值.本研究表明HA用于吸附处理费托反应生成水有效,且过程简单、价格低廉,在工业应用中具有潜力.The Fischer-Tropsch process produces liquid fuels.However,the process also yields Fischer-Tropsch wastewater,an acidic and corrosive byproduct enriched with various water-soluble oxygen-containing compounds such as alcohols,aldehydes,ketones and carboxylic acids,demanding careful treatment before discharge.Herein,the interactions between n-butanol and propionic acid,two main components in Fischer-Tropsch wastewater,and humic acid(HA)were studied with nuclear magnetic resonance(NMR)techniques.One-dimensional^(1)H chemical shift titration and^(1)H relaxation time measurements showed that:the peak width of both n-butanol and propionic acid broadened with increasing HA concentration,while the^(1)H chemical shift was unaltered for n-butanol,but moved to high field for propionic acid.The^(1)H spin-lattice and spin-spin relaxation time of n-butanol and propionic acid decreased and the^(1)H correlation time increased with increasing HA concentration.The interactions between HA and n-butanol were enhanced by increasing the HA concentration,but less affected by solution pH.While,the interactions between HA(20 mg/mL)and propionic acid were promoted by increasing the HA concentration and decreasing the solution pH value.It also appeared that the HA concentration plays a decisive role in the interaction.The study demonstrated that using HA for treatment of Fischer-Tropsch wastewater has a great potential in industrial applications owing to its simplicity and low price.

关 键 词：液体核磁共振 吸附 费托反应生成水 腐殖酸 正丁醇 丙酸 

分 类 号：O482.53[理学—固体物理]