氨基化胶原纤维的制备及其对染料的吸附性能研究
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摘要
以乙二胺(EDA)为原料、三聚氰氯(CNC)为交联剂,根据固相合成法和亲核取代反应机理,对制备的酸松弛猪皮胶原纤维(CF)进行氨基化改性,制备了以胶原纤维为基质的不同代数的氨基化胶原纤维吸附剂;通过单因素实验法优化出了第一代氨基化胶原纤维的最佳改性条件:反应投料比n(CNC)︰n(-NH_2)=1.4,反应第一阶段冰水浴反应时间为3h,第二阶段反应温度为45℃,反应时间为4h,第三阶段反应温度为70℃,反应时间为3h;采用化学分析法(水杨醛法)测定了改性前后胶原纤维中的氨基含量变化,并用扫描电镜(SEM)和红外光谱(FTIR)对改性前后胶原纤维的组织形态和分子结构进行了检测和表征。以酸性黑NT染液模拟染料废水,分别考察了温度、pH、染料初始浓度、吸附剂用量和时间对染料吸附的影响,结果表明:所制备的吸附剂对酸性黑染料吸附的最适温度为40℃,最适pH为2.5;对于一定量的染液,吸附量随着染料初始浓度的增大而增加,随着吸附剂用量的增加而减小,随着时间的延长吸附量先增加后趋于平缓。通过对酸性黑NT染液和鲟鱼皮染色废水的处理,对比观察了改性前后及不同改性程度的胶原纤维对染料吸附能力的大小;对酸性黑NT染料在胶原纤维上吸附的热力学和动力学进行了研究,结果表明:Freundlich等温方程和拟二级速率方程能够更好的描述酸性黑NT染料在第一代氨基化胶原纤维(ACF-Ⅰ)上的吸附行为。
With ethylenediamine (EDA) as raw material and cynuricchloride(CNC) as cross-linking agent, acid relaxed collagen fiber (CF)from pigskin was modified to different generations of aminated collagenfiber (ACF) adsorbents according to solid-phase synthesis andnucleophilic substitution; The appropriate modification conditions wereoptimized by single factor experiment method: the reaction molar ration (CNC)︰n(-NH_2) was1.4, the reaction time of ice water bath was3h,the temperature of the second phase was45℃and the reaction time was4h, the temperature of the third phase was70℃and the reaction timewas3h. And measure the amino contents of CF and ACF with inhibitingaldehyde method. The form and structure of CF and ACF werecharacterized and analyzed by SEM and FTIR respectively. Then useacid black dye NT simulating dye wastewater and investigate theinfluence of temperature, pH, dye initial concentration, adsorbent doseand reaction time on the dye absorption respectively. The resultsindicated that the optimal temperature and pH of acid black dyeabsorption were all40℃and2.5. For a certain amount of liquid, theadsorption capacity increased with the increasing of initialconcentration of dye, but decreased along with the increasing of theadsorbent dose. With the extension of time, the adsorption capacityincreased at the beginning, and then, basically kept constant. Theadsorption ability of collagen fiber and different generations ofaminated collagen fibers were observed after the treatment of acidicblack dyeing NT and sturgeon skin dyeing wastewater. And theadsorption thermodynamics and adsorption dynamics were studied afterthe treatment of acidic black dyeing NT with the first generation ofcollagen fiber. The results showed that, the Freundlich equation and Pseudosecond-order kinetic model can better describe acidic black dyeNT in the adsorption behavior of ACF-Ⅰ.
引文
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