Kinetic Study of Nitrate Removal from Aqueous Solutions Using Copper-Coated Iron Nanoparticles
Kinetic Study of Nitrate Removal from Aqueous Solutions Using Copper-Coated Iron Nanoparticles
复制标题
DOI：
10.1007/s00128-016-1865-9
复制
发表时间：
2017-03
影响因子：
2.7
通讯作者：
G. Vilardi;L. Di Palma
中科院分区：
文献类型：
--
作者：
G. Vilardi;L. Di Palma
硝酸盐被认为是对人类健康有害的化合物，因为它们倾向于被还原为亚硝酸盐，特别是在还原环境中。纳米零价铁（nZVI）是一种高效、低成本的吸附剂/还原剂，用于去除地下水和废水中的硝酸盐，少量添加第二种金属（Cu、Pd、Ni、Ag）已被证明可以通过增强纳米颗粒的稳定性和抗氧化性来提高工艺效率。在这项工作中，Cu/Fe纳米颗粒被加载到NO3−溶液（100 mg L−1）中，并通过在选定的时间间隔监测硝酸盐浓度来测试去除效率。结果表明，硝酸盐的去除过程包括还原和吸附两个过程，研究了硝酸盐的去除机理，并成功验证了拟一级和拟二级吸附动力学模型。
Nitrates are considered hazard compounds for human health due to their tendency to be reduced to nitrites, in particular in reducing environment. Nano zero valent iron (nZVI) represents an efficient and low-cost adsorbent/reductive agent for nitrate removal from groundwater and wastewaters and a little addition of a second metal species (Cu, Pd, Ni, Ag) has proven to increase process effectiveness, by enhancing stability and oxidation resistance of nanoparticles. In this work Cu/Fe nanoparticles were loaded in a NO3−solution (100 mg L−1) and the removal efficiency was tested by monitoring nitrate concentration at selected time intervals. Results showed that the nitrate removal process involves both reduction and adsorption processes: the removal mechanism has been investigated, and the pseudo-first-order and pseudo-second-order-adsorption kinetic models were successfully tested.