摘要
以硅胶表面接枝有聚乙烯醇(PVA)的接枝微粒PVA/SiO2为固体吸附剂,对槲皮素和芦丁2种黄酮类化合物进行了吸附研究,结果表明,由于接枝微粒PVA/SiO2表面含有高密度的羟基,使得该接枝微粒与黄酮类化合物分子之间可形成多位点的常规氢键和π型氢键,溶剂的竞争吸附对黄酮化合物的吸附容量产生很大的影响.以弱极性的1,2-二氯乙烷(DCE)为溶剂时,几乎不存在溶剂的竞争吸附,槲皮素和芦丁具有最高的吸附容量,分别为0.32 mmol/g(96 mg/g)和0.23 mmol/g(140 mg/g);而在质子溶剂乙醇中,强烈的溶剂竞争吸附使两者的吸附容量降至0.22 mmol/g(65 mg/g)和0.14 mmol/g(87 mg/g).升高温度会减弱氢键作用,甚至使氢键断裂,导致吸附容量减小.质子溶剂中电解质的存在,对吸附作用产生负性影响.功能微粒PVA/SiO2对黄酮类化合物的吸附为放热过程,且为焓驱动的吸附过程.
The adsorption characters of two kinds of flavonoids, quercetin and rutin, were conducted by poly- vinyl alcohol（PVA）-grafted silica gel particles PVA/SiO2 as solid adsorbent. The research results show that the conventional hydrogen bond with multiple sites and or type hydrogen bond can be formed between the hy- droxyl groups with high density on the surfaces of the functional composite particles PVA/SiO2 and the hydrox- yl groups and the conjugated aromatic rings in the molecules of flavonoid compounds. The competing adsorp- tion of the solvent will produce great negative effects on the adsorption capacity of the flavonoids. In 1,2-di- chloroethane（DCE） as a weak polarity solvent, the competing adsorption of the solvent barely exists. There- fore, when DCE is used as solvent, quercetin and rutin have very high adsorption capacities, and they are 0. 32 mmol/g（96 mg/g） and 0.23 mmol/g（ 140 mg/g） , respectively. While in ethanol as a protic solvent, the adsorption capacities of quereetin and rutin decline greatly as a result of the strong competing adsorption of the solvent, and they are 0.22 mmol/g（65 mg/g） and 0.14 mmol/g（87 mg/g）, respectively. Rising tem- perature will weaken the hydrogen bond interaction between the functional composite particles PVA/SiO2 and quercetin or rutin, and even makes the hydrogen bond rupture, leading to the decrease of the adsorption ca- pacity. The existence of electrolytes in the protic solvent will influence the adsorption negatively. The adsorp- tion process of the functional composite particles PVA/SiO2 for flavonoids is exothermie and driven by enthalpy.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第4期1000-1006,共7页
Chemical Journal of Chinese Universities
基金
山西省青年科学基金(批准号:2011021021-5)资助
关键词
聚乙烯醇
接枝微粒
黄酮
氢键作用
吸附
Polyvinyl alcohol
Grafted particle
Flavonoid
Hydrogen bond interaction
Adsorption
