Removal of Fe(Ⅱ), Mn(Ⅱ), and NH4 -N by Using δ-MnO2Coated Zeolite

作者：Ma, Wen-Jie; Chen, Tian-Hu^*; Chen, Dong; Liu, Hai-Bo; Cheng, Peng; Zhang, Ze-Xin; Tao, Qiong; Zhang, Yu-Zhu

来源：Environmental Science, 2019, 40(10): 4553-4561.

DOI：10.13227/j.hjkx.201903257

• Adsorption capacities
• Adsorption mechanism
• Environmental conditions
• Environmental minerals
• Oxidation catalysis
• Oxidation-reduction precipitation
• Potassium permanganate
• Pseudo-second-order kinetic models

δ-MnO2/zeolite nanocomposites were prepared with natural zeolite, potassium permanganate, and manganese sulfate by oxidation-reduction precipitation, which were used to simultaneously remove Fe2 , Mn2 , and NH4 -N from groundwater. To investigate the performance and mechanism of Fe2 , Mn2 , and NH4 -N removal from groundwater by δ-MnO2/zeolite nanocomposites, static batch experiments were conducted under different environmental conditions in a zero-oxygen atmosphere using SEM, TEM, Zeta potential, FTIR, and XPS techniques. The experimental results showed that the manganese-oxide-coated natural zeolite was δ-MnO2, and Fe2 , Mn2 , and NH4 -N adsorption on the δ-MnO2/zeolite nanocomposites could be best described with the pseudo-second-order kinetic model and the Langmuir model. In addition, the maximum adsorption capacities of Fe2 , Mn2 , and NH4 -N were calculated to be 215.1, 23.6, and 7.64 mg•g-1, respectively. The removal mechanism of NH4 -N from the solutions by zeolite was via the action of ion exchange, and the adsorption and oxidation catalysis of δ-MnO2-coated zeolite were responsible for the removal of Fe2 and Mn2 . This research indicates that δ-MnO2/zeolite nanocomposites could be used as highly efficient adsorbents to simultaneously remove Fe2 , Mn2 , and NH4 -N from water.

• 单位
  合肥工业大学