Shao Jicheng, Yu Xiaoniu, Zhou Min, Cai Xiaoqing, Yu Chuang
College of Civil Engineering and Architecture, Wenzhou University, Wenzhou 325035, China.
College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China.
Materials (Basel). 2018 Jun 4;11(6):945. doi: 10.3390/ma11060945.
The removal efficiency of Cu(II) in aqueous solution by bentonite, graphene oxide (GO), and nanoscale iron decorated on bentonite (B-nZVI) and nanoscale iron decorated on bentonite/graphene oxide (GO-B-nZVI) was investigated. The results indicated that GO-B-nZVI had the best removal efficiency in different experimental environments (with time, pH, concentration of copper ions, and temperature). For 16 hours, the removal efficiency of copper ions was 82% in GO-B-nZVI, however, it was 71% in B-nZVI, 26% in bentonite, and 18% in GO. Bentonite, GO, B-nZVI, and GO-B-nZVI showed an increased removal efficiency of copper ions with the increase of pH under a certain pH range. The removal efficiency of copper ions by GO-B-nZVI first increased and then fluctuated slightly with the increase of temperature, while B-nZVI and bentonite increased and GO decreased slightly with the increase of temperature. Lorentz-Transmission Electron Microscope (TEM) images showed the nZVI particles of GO-B-nZVI dispersed evenly with diameters ranging from 10 to 86.93 nm. Scanning electron microscope (SEM) images indicated that the nanoscale iron particles were dispersed evenly on bentonite and GO with no obvious agglomeration. The q (73.37 mg·g and 83.89 mg·g) was closer to the experimental value q according to the pseudo-second-order kinetic model. The q of B-nZVI and GO-B-nZVI were 130.7 mg·g and 184.5 mg·g according to the Langmuir model.
研究了膨润土、氧化石墨烯（GO）、膨润土负载纳米铁（B-nZVI）和膨润土/氧化石墨烯负载纳米铁（GO-B-nZVI）对水溶液中Cu(II)的去除效率。结果表明，在不同实验环境（时间、pH值、铜离子浓度和温度）下，GO-B-nZVI的去除效率最佳。16小时内，GO-B-nZVI对铜离子的去除效率为82%，而B-nZVI为71%，膨润土为26%，GO为18%。在一定pH范围内，膨润土、GO、B-nZVI和GO-B-nZVI对铜离子的去除效率均随pH值的升高而增加。GO-B-nZVI对铜离子的去除效率随温度升高先增加后略有波动，而B-nZVI和膨润土随温度升高而增加，GO随温度升高略有下降。洛伦兹透射电子显微镜（TEM）图像显示，GO-B-nZVI的nZVI颗粒均匀分散，直径范围为10至86.93 nm。扫描电子显微镜（SEM）图像表明，纳米铁颗粒均匀分散在膨润土和GO上，无明显团聚。根据准二级动力学模型，q（73.37 mg·g和83.89 mg·g）更接近实验值q。根据朗缪尔模型，B-nZVI和GO-B-nZVI的q分别为130.7 mg·g和184.5 mg·g。
