Cyanide uptake from wastewater by modified natrolite zeolite-iron oxyhydroxide system: application of isotherm and kinetic models.
Cyanide uptake from wastewater by modified natrolite zeolite-iron oxyhydroxide system: application of isotherm and kinetic models.
复制标题
改性钠沸石沸石-羟基氧化铁系统从废水中吸收氰化物：等温线和动力学模型的应用。
DOI：
10.1016/j.jhazmat.2008.12.012
复制
发表时间：
2009
影响因子：
13.6
通讯作者：
Parisa Ahmadzadeh Fard
中科院分区：
文献类型：
--
作者：
M. Noroozifar;M. Khorasani;Parisa Ahmadzadeh Fard
介绍了一种从废水中去除氰化物的方法。该方法涉及的氰化物的吸附改性天然沸石（钠沸石）使用间歇技术。本研究采用了一种新的羟基氧化铁-钠沸石体系。结合XRD、XRF和FTIR光谱以及TG/DSC热分析对沸石材料进行了表征。研究了pH值、吸附剂用量、接触时间等参数对脱氰率的影响。据观察，在固定的pH 7.5下，通过增加吸附剂的剂量和接触时间，产率增加。在最佳工艺条件下，氰化物的收率可达82%。选择最佳条件下获得的实验数据，使用六个等温方程（Freundlich，Langmuir，Langmuir-Freundlich，Dubininin-Radushkevich，Redlich-Peterson和Toth）对材料的吸附行为进行建模。模拟结果表明，虽然考虑到地表非均质性的三参数模型最接近实测数据，但参数估计值可能存在较大偏差。动力学研究表明，二级动力学模型是可行的。
A method for the removal of cyanides from wastewater is described. The method involves the adsorption of cyanides by a modified natural zeolite (natrolite) using batch technique. A new iron oxyhydroxide–natrolite system was used in this study. A combination of XRD, XRF and FTIR spectroscopies, as well as TG/DSC thermal analyses was used for characterization of zeolitic materials. Effects of parameters such as pH, amount of adsorbent and contact time on the cyanide removing yield are studied. It was observed that the yield increases by increasing dosage of adsorbent and contact time at a fixed pH 7.5. A yield of 82% was achieved at optimum conditions for removing cyanide from industrial wastewaters. The experimental data obtained for optimum conditions were selected for modeling the adsorption behavior of the materials using six isotherm equations (Freundlich, Langmuir, Langmuir–Freundlich, Dubinin–Radushkevich, Redlich–Peterson and Toth). The obtained modeling results indicated that, although the three-parameter models, taking into account the surface heterogeneity, provided the closest approach to the measurement data, the parameters estimates could be highly biased. The kinetic studies proved that the second-order kinetic was the applicable model.