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通过静态吸附实验,选择AB-8型大孔树脂对花生壳总黄酮进行吸附,研究了吸附过程中的热力学特性。采用Freundlich、Langmuir和Temkin 3种常用的吸附等温方程拟合形成吸附等温线方程,在此基础上利用热力学函数计算吸附过程中的吸附焓变ΔH、熵变ΔS和自由能变ΔG。结果表明:该吸附是一个物理过程;Freundlich吸附等温线模型能可靠地反映吸附过程,20、25、30、35、40℃5个温度下的特征参数n值都大于1,表明吸附是优惠吸附;吸附过程中焓变ΔH大于0且与温度无关、熵变ΔS大于0和自由能变ΔG小于0,表明吸附是由熵推动的自发的吸热过程。 相似文献
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为了解D941大孔树脂对茶多糖的吸附性能及热力学性质,通过吸附等温线测定及吸附等温方程拟合,得出该树脂对茶多糖的吸附等温方程及相关的热力学参数。实验结果显示,树脂对茶多糖的吸附量随着温度升高而减小;在上样液浓度为2.5~5.5mg/ml之间树脂吸附茶多糖符合Langmuir模型;而在实验浓度范围内即1.5~5.5mg/ml符合Freundlich模型;吸附过程的吉布斯自由能变ΔGm<0,焓变ΔHm<0;树脂对茶多糖的平衡吸附量为16.5mg/g。实验结果表明D941大孔树脂适于茶多糖的吸附。 相似文献
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本文研究了六种大孔吸附树脂HZ801、HZ806、HZ816、HZ818、HZ830和AB-8对叶黄素酯的吸附和解吸性能,结果表明HZ816较其他树脂表现出更好的吸附和解吸能力,并对该树脂的静态和动态吸附解吸条件进行了研究,确定了树脂纯化叶黄素酯的最佳工艺参数。最佳工艺条件为:在25℃下,以20%正己烷-乙醇为吸附溶剂,上样液浓度在1.432~1.891mg/mL范围内,吸附流速2BV/h,上样量7BV;洗脱剂为乙醇和50%正己烷-乙醇溶液,洗脱流速为3BV/h。经树脂纯化后,叶黄素酯的纯度由63.3%提高到91.7%,回收率为75.9%。本文还对HZ816树脂的重复利用性做了研究,对同一树脂柱进行10个周期的重复实验,结果表明树脂的吸附量和解吸率较初始时并没有显著下降,亦无破碎现象,树脂稳定性良好,可在生产中多次重复利用。 相似文献
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大孔吸附树脂对虎杖中白藜芦醇吸附性能的研究 总被引:7,自引:0,他引:7
本文研究了多种大孔吸附树脂对白藜芦醇的吸附与脱附性能,从中选出H103树脂具有较大吸附量和解吸率。动态吸附实验研究了提取液浓度、pH、流速对H103树脂吸附量的影响,适合的上柱浓度为0.7157mg/ml,上柱液的pH为4.10,上柱液流速为2BV/h。4倍树脂床体积的80%乙醇以1BV/h的流速进行洗脱即可基本将白藜芦醇完全从H103树脂上解吸下来。 相似文献
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Qing-Feng Zhang Zi-Tao Jiang Hong-Juan Gao Rong Li 《European Food Research and Technology》2008,226(3):377-383
A simple method for recovery of dissolved vanillin from aqueous solutions by the adsorption–regeneration technique has been
developed. Three macroporous adsorption resins with crosslinked-polystyrene framework were NKA-2, S-8 and H103, respectively.
Static equilibrium adsorption studies were used for comparing the adsorption capacities of the three resins. The results showed
that H103 resin had the best adsorption capacity because of its large and nonpolar surface areas. The effects of pH, temperature
and salt concentration on the adsorption capacity of H103 were investigated. The results revealed that the resin had a maximum
adsorption capacity, 416 mg/g (vanillin/resin) in acidic condition when the molecule of vanillin is neutral. Furthermore,
its adsorption capacity increased with the increase of temperature and salt concentration. The mass transfer zone motion model
was used for analyzing the fixed bed adsorption. H103 resin had a shorter mass transfer zone of 24.7 cm and both NKA-2 and
S-8 were higher than 30 cm in the experiment conditions. More than 95.6% of adsorbed vanillin can be recovered by use of 3–5
bed volumes of absolute ethanol. The resin can be used repeatedly by simple regeneration and its adsorption capacity was almost
unchangeable. 相似文献
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The effects of different steps in honey production on chloramphenicol (CAP) levels and CAP removal from honey using macroporous adsorption resins (MARs) were investigated in this study. CAP residues in honey were quantified by enzyme-linked immunosorbent assay after each processing step including preheating, filtration, vacuum concentration and pasteurization. Vacuum concentration contributes the most reduction of CAP level (9.9%). Meanwhile, 5 types of MARs (including LSI-1, LSI-2, LSI-3, LS-803, and LS-903) were used in CAP adsorption. The results showed that LS-803 resin had higher adsorption rate of 86% than other resins in removing CAP from honey, and its optimal adsorption time and temperature were 40 min and 55 °C, respectively. The treated honey could be used as feed additive or biomass energy. Therefore, it would be a novel approach to reutilization of antibiotics contaminated honey. 相似文献
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采用大孔吸附树脂纯化樟树叶醇提液中木脂素类化合物。通过对比6种大孔树脂对樟树叶中木脂素吸附-解吸效果,从中筛选一种最适大孔吸附树脂作为纯化材料,并研究上样浓度、上样流速、上样体积对大孔树脂吸附率的影响,以及洗脱剂浓度、洗脱流速、洗脱剂用量对大孔树脂解吸率的影响,通过正交试验优化大孔树脂纯化木脂素的工艺。试验结果表明,大孔树脂最佳吸附-解吸工艺条件为:7BV上样量、2.12mg/mL上样浓度、1.0 mL/min上样速率、80%乙醇洗脱剂、洗脱流速2BV/h,洗脱剂用量8BV,该条件下樟树叶中木脂素得率为66.68%,纯度为15.91%,表明该大孔树脂对于樟树叶中木脂素纯化效果较好。 相似文献
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以水酶法制油工艺得到的花生水解蛋白为原料,从5种大孔吸附树脂中筛选出对花生水解蛋白中可溶性肽有较好吸附效果的DA201-C作为纯化树脂对其进行纯化。静态吸附试验表明,DA201-C对花生水解蛋白中可溶性肽有较好的吸附作用,能有效除去糖类杂质。DA201-C对可溶性肽吸附平衡时间为3 h,75%的乙醇解吸效果最好,解吸率为83.24%。动态试验结果显示,以pH为3的稀HAc溶液配制花生水解蛋白液能提高吸附率;解吸时,先用5BV去离子水洗去糖类杂质,再收集6BV75%乙醇洗脱的肽,水解蛋白中肽回收率为79.24%,除糖纯化后水解蛋白含量提高了近20%。 相似文献