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Adsorption of Cationic Dyes Using Waste from Fruits of Eugenia umbelliflora Berg (Myrtaceae)

机译:Eugenia umbelliflora Berg(桃金娘科)果实中的废物对阳离子染料的吸附

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摘要

Waste of the fruits of Eugenia umbelliflora (the by-product of medicinal plant processing) (FEU-T) and untreated fruits of Eugenia umbelliflora (FEU-UT) was studied in a batch system, as alternative adsorbents for removing the dyes methylene blue (MB) and rhodamine B (RhB) from aqueous solution. The adsorbent was characterized by point of zero charge, type of functional groups, Fourier infrared spectroscopy and thermogravimetric analysis. The adsorption was analyzed, and the Sips equation was found to be the best model. The adsorption and maximum adsorption capacity obtained for the FEU-UT were 157.2 mg/g for the MB and 161.1 mg/g for the RhB, and for the FEU-T, these figures were 111.6 mg/g for the MB and 106.4 mg/g for the RhB. The adsorption of the dye followed the kinetic pseudo-first-order. The adsorption process was found to be exothermic and spontaneous. The removal of the dyes was optimized using a factorial Box-Behnken design, and the initial dye concentration proved to be more influential in dye adsorption than system temperature. These results demonstrate that waste from the fruits Eugenia umbelliflora is a promising adsorbent for removing MB and RhB from aqueous solutions.
机译:以分批方式研究了紫草(药用植物加工的副产品)(FEU-T)和未经处理的紫草(FEU-UT)水果的废料,作为去除染料亚甲基蓝( MB)和若丹明B(RhB)的水溶液。通过零电荷点,官能团类型,傅立叶红外光谱和热重分析对吸附剂进行了表征。分析了吸附,发现Sips方程是最佳模型。对于FEU-UT,MB的吸附和最大吸附容量为157.2 mg / g,RhB为161.1 mg / g,对于FEU-T,MB的吸附和最大吸附容量为111.6 mg / g,MB为106.4 mg / g。 g为RhB。染料的吸附遵循动力学拟一级。发现吸附过程是放热的和自发的。使用析因Box-Behnken设计优化了染料的去除,事实证明,初始染料浓度比系统温度对染料吸附的影响更大。这些结果表明,来自水果紫锥菊的废物是从水溶液中去除MB和RhB的有前途的吸附剂。

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