Optimization of Cadmium (CD2+) removal from aqueous solutions by novel biosorbent
Optimization of Cadmium (CD2+) removal from aqueous solutions by novel biosorbent
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DOI：
10.1080/15226514.2015.1086305
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发表时间：
2016-01-01
影响因子：
3.7
通讯作者：
Radwan, Ahmed
中科院分区：
文献类型：
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作者：
Mahmoud, Alaa El Din;Fawzy, Manal;Radwan, Ahmed
在这项研究中，一种常见的观赏植物，龙血树，也被称为龙血树的枯叶被用作生物吸附剂去除镉（Cd 2+）的水溶液中使用的完全2（3）析因实验设计。在金属离子浓度（X = 10和100 ppm）、氢离子浓度（Ph = 2和7）和生物量（BD = 0.1和0.5g）两个不同水平下考察了三个因素。在室温下用50 ml Cd ~（2+）溶液进行了两次重复实验，当比较观测值（实验值）和计算值（模型值）时，它们被紧密地放在一起，从而表明正态分布，其中R ~（-2）= 0.9938。通过pH（zpc）和SEM-EDAX对吸附剂进行表征，结果表明，（X）对Cd ~（2+）的吸附效果最显著。（pH BD）和（X pH）的交互作用对Cd 2+去除率有显著影响。当X = 10 ppm，pH = 7，BD = 0.5g时，Cd ~（2+）的去除率最高，达到79.60%。吸附剂的重复使用性在三个解吸循环测试，再生效率为99.7%以上。
In this research, dead leaves of a common ornamental plant, Dracaena draca known also as dragon tree was used as a biosorbent for the removal of Cadmium (Cd2+) from aqueous solutions using a full 2(3) factorial experimental design. Three factors were investigated at two different levels, metal ion concentration (X = 10 and 100ppm), hydrogen ion concentration (Ph = 2 and 7) and biomass dose (BD = 0.1 and 0.5g). Experiments were carried out in duplicates with 50ml of Cd2+ solutions at room temperature.When comparing observed values (experimental) with calculated values (model), they were set closely together that allowed suggesting a normal distribution where (R-2 = 0.9938). A characterization of the biosorbent was done by pH(zpc) and SEM-EDAX.Results also showed that the most significant effect for Cd2+ biosorption was ascribed to (X). The interaction effects of (pH BD) and (X pH) were found to have significant influence on Cd2+ removal efficiency. The highest Cd2+ removal percentage attained by 79.60% at X = 10ppm, pH = 7 and BD = 0.5g. The reusability of the biosorbent was tested in three desorption cycles and the regeneration efficiency was above 99.7%.