Kazemipour Maryam, Ansari Mehdi, Tajrobehkar Shabnam, Majdzadeh Majdeh, Kermani Hamed Reihani
Department of Chemistry, Faculty of Sciences, Islamic Azad University, Kerman Branch, Kerman, Iran.
J Hazard Mater. 2008 Jan 31;150(2):322-7. doi: 10.1016/j.jhazmat.2007.04.118. Epub 2007 May 3.
In this work, adsorption of copper (Cu), zinc (Zn), lead (Pb), and cadmium (Cd) that exist in industrial wastewater onto the carbon produced from nutshells of walnut, hazelnut, pistachio, almond, and apricot stone has been investigated. All the agricultural shell or stone used were ground, sieved to a defined size range, and carbonized in an oven. Time and temperature of heating were optimized at 15 min and 800 degrees C, respectively, to reach maximum removal efficiency. Removal efficiency was optimized regarding to the initial pH, flow rate, and dose of adsorbent. The maximum removal occurred at pH 6-10, flow rate of 3 mL/min, and 0.1g of the adsorbent. Capacity of carbon sources for removing cations will be considerably decreased in the following times of passing through them. Results showed that the cations studied significantly can be removed by the carbon sources. Efficiency of carbon to remove the cations from real wastewater produced by copper industries was also studied. Finding showed that not only these cations can be removed considerably by the carbon sources noted above, but also removing efficiency are much more in the real samples. These results were in adoption to those obtained by standard mixture synthetic wastewater.
在这项工作中，研究了工业废水中存在的铜（Cu）、锌（Zn）、铅（Pb）和镉（Cd）在核桃、榛子、开心果、杏仁和杏核壳所制得的碳上的吸附情况。所有使用的农业壳或核均进行研磨，筛分到规定尺寸范围，并在烘箱中碳化。加热时间和温度分别优化为15分钟和800摄氏度，以达到最大去除效率。针对初始pH值、流速和吸附剂用量对去除效率进行了优化。最大去除率出现在pH值为6 - 10、流速为3 mL/min以及0.1 g吸附剂的条件下。随着阳离子通过碳源的次数增加，碳源去除阳离子的能力会显著下降。结果表明，所研究的阳离子能够被碳源显著去除。还研究了该碳去除铜工业产生的实际废水中阳离子的效率。研究发现，上述碳源不仅能大量去除这些阳离子，而且在实际样品中的去除效率更高。这些结果与标准混合合成废水所获得的结果一致。
