Kinetic and Equilibrium Studies of Neutral Red Adsorption onto Spent Ground Coffee from Aqueous Solution
Kinetic and Equilibrium Studies of Neutral Red Adsorption onto Spent Ground Coffee from Aqueous Solution
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DOI：
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发表时间：
2016
影响因子：
3.4
通讯作者：
Yingjie Dai;Kexin Zhang;Danfeng Zhang;Yanjun Chen
中科院分区：
文献类型：
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作者：
Yingjie Dai;Kexin Zhang;Danfeng Zhang;Yanjun Chen
研究了中性红(NR)在废磨咖啡(SGC)上的吸附性能。考察了pH值、吸附剂投加量等参数对天然橡胶去除效果的影响。当投加量为25和40 mg/L时，反应2 h后对硝酸根氮的去除效率分别为95.6%和90.2%。PH值越高，硝酸盐氮的去除效果越好。吸附平衡数据符合Langmuir等温式，吸附容量为136.98 mg/g。吸附机理可以通过天然橡胶与SGC界面上的疏水相互作用来实现。研究表明，SGC是一种价格低廉、使用方便的天然橡胶吸附剂。
In this study, the adsorption of neutral red (NR) on the spent ground coffee (SGC) was examined. The effect of various parameters such as pH and adsorbent dose on the removal of NR was investigated. The removal ratios of NR (25 and 40 mg/L) on SGC after 2 h were 95.6 and 90.2%, respectively. The removal ratio of NR is increased by increasing the pH value. Equilibrium data fitted very well in a Langmuir isotherm equation, the adsorption capacity of NR was 136.98 mg/g for SGC. The adsorption mechanisms can be contributed by hydrophobicity interaction at the interface occurs between NR and SGC. The present study shows that the SGC is an inexpensive and easily used NR adsorbent.