Particle concentration effect: adsorption of divalent metal ions on coffee grounds.
Particle concentration effect: adsorption of divalent metal ions on coffee grounds.
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DOI：
10.1016/j.biortech.2009.06.094
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发表时间：
2010-03
影响因子：
11.4
通讯作者：
H. D. Utomo;K. Hunter
中科院分区：
文献类型：
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作者：
H. D. Utomo;K. Hunter
研究了咖啡渣对二价金属离子Cu ~（2+）、Pb ~（2+）、Zn ~（2+）和Cd ~（2+）的吸附，发现吸附密度随咖啡渣浓度的增加而降低。吸附研究是通过平衡浓度范围为19-291μmolL− 1的每种金属离子的水溶液与浓度范围为0.971-8.738gL−1的咖啡悬浮液进行的，初始pH值用NaOH或HNO 3调节至5.0±0.1。亚稳平衡吸附理论不能充分解释吸附现象，除了在低浓度的咖啡渣和微量金属离子。相反，结果表明，絮凝可能会降低表面的可用性，从而降低吸附密度。通过添加分散剂六偏磷酸钠（NaHMP）进一步实验证实了絮凝理论。
The adsorption of divalent metal ions Cu2+, Pb2+, Zn2+, and Cd2+on coffee grounds as a function of coffee grounds concentration was studied in which adsorption density decreased as the concentration of coffee grounds (Cs) increased. Adsorption studies were conducted by equilibrating aqueous solutions of each metal ion at concentrations in the range 19–291μmolL−1with coffee suspensions in the concentration range 0.971–8.738gL−1, with the initial pH adjusted to 5.0±0.1 using NaOH or HNO3. Metastable Equilibrium Adsorption theory did not adequately explain the adsorption phenomenon, except at low concentrations of coffee grounds and trace metal ions. Instead the results indicated that flocculation might reduce the surface availability thus reducing the adsorption density. The flocculation theory was confirmed after a further experiment adding dispersant sodium hexa-meta-phosphate (NaHMP) to the suspension.