摘要
将磁化后的凹凸棒土用于吸附废水中的Cr(Ⅵ)。研究了吸附剂量、温度、吸附时间和p H值等因素对吸附过程的影响。结果表明,磁性凹凸棒土对Cr(Ⅵ)的吸附能力随着吸附剂用量的增大而降低。吸附动力学实验证实了Cr(Ⅵ)在凹凸棒土上的吸附服从准二级动力学模型,而Langmuir模型很好地反映了不同温度下的吸附等温线。对热力学参数ΔG,ΔH和ΔS的计算可知,磁性凹凸棒土吸附Cr(Ⅵ)是自发、吸热的物理过程。
The magnetic-modified palygorskite clays were applied as adsorbents for removal of Cr （VI） from aqueous solution. The influences of various experimental parameters were investigated by using a batch adsorption technique. Results showed that the adsorption capacity of the magnetic-modified palygorskite clays decreased with increasing adsorbent dosage. Adsorption kinetic was best represented by the pseudo second-order kinetic model and the adsorption isotherms indicated that the Langmuir model is better to reflect the adsorption process. The obtained thermodynamic function calculation revealed that the sorption was a spontaneous and endothermic process. The magnetic-modified palygorskite clays had a great potential application in adsorption of heavy metal ions.
出处
《科学技术与工程》
北大核心
2015年第13期108-113,共6页
Science Technology and Engineering
基金
陕西省宝鸡市科技局项目(2013R7-5)
陕西省宝鸡文理学院院级项目(YK1417)资助
关键词
磁性凹凸棒土
CR^6+
吸附
动力学
magnetic-modified palygorskite clays chromium adsorption kinetics
