Barrera-Díaz C, Colín-Cruz A, Ureña-Nuñez F, Romero-Romo M, Palomar-Pardavé M
Universidad Autónoma del Estado de México. Facultad de Química. Paseo Colón intersección Paseo Tollocan S/N. C.P. 50120, Toluca, Estado de México, México.
Environ Technol. 2004 Aug;25(8):907-17. doi: 10.1080/09593330.2004.9619384.
This work presents conditions for hexavalent chromium (Cr(VI)) removal from aqueous solution using different sorbent materials, namely: pyrolytic ashes of an industrial sludge from wastewater treatment and roots of Typha latifolia. The sorbent materials were characterized using scanning electron microscopy (SEM) and surface area using the Brunauer-Emmett-Teller (BET) technique, before and after the contact with the chromium-containing aqueous media. An overall Cr(VI) concentration reduction of 45% was achieved using the roots of Typha latifolia whereas in the case of pyrolytic ashes a 60% removal was observed. The percentage removal was found to depend on the initial Cr(VI) concentration in aqueous solution, pH and temperature. The Cr(VI) uptake process was maximum at pH 2 and a temperature of 40 degrees C for both sorbents. These materials showed a Cr(VI) adsorption capacity that was adequately described by the Langmuir adsorption isotherm. It was demonstrated that the use of waste materials for the treatment of Cr(VI)-containing wastewater is an effective and economical alternative method.
这项工作提出了使用不同吸附剂材料从水溶液中去除六价铬（Cr(VI)）的条件，这些吸附剂材料分别是：来自废水处理的工业污泥的热解灰和香蒲的根。在与含铬水介质接触之前和之后，使用扫描电子显微镜（SEM）对吸附剂材料进行了表征，并使用布鲁诺尔-埃米特-特勒（BET）技术测定了表面积。使用香蒲的根实现了Cr(VI)总浓度降低45%，而对于热解灰，观察到去除率为60%。发现去除百分比取决于水溶液中初始Cr(VI)浓度、pH值和温度。两种吸附剂在pH值为2和温度为40摄氏度时，Cr(VI)的吸收过程达到最大值。这些材料的Cr(VI)吸附容量可以用朗缪尔吸附等温线充分描述。结果表明，使用废料处理含Cr(VI)废水是一种有效且经济的替代方法。
