Zhang Xiang-Ling, Huang Hua-Ling, Guo Lu, Chen Qiao-Zhen, Ruan Chong-Ying, Leng Yu-Jie
School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China.
Huan Jing Ke Xue. 2016 Aug 8;37(8):3058-3066. doi: 10.13277/j.hjkx.2016.08.029.
Zn-Layered double hydroxides (LDHs) were selected to carry out the experiment in present work based on the previous research results. According to the co-precipitation method, three kinds of different Zn-LDHs (FeZn-LDHs, CoZn-LDHs and AlZn-LDHs) were synthesized by ZnCl, FeCl, AlCl, and CoCl solution in alkaline conditions and Zn-LDHs were in-situ coated on the surface of natural zeolites. With the filling of the natural and three kinds of Zn-LDHs modified zeolites in the columns, test experiments were conducted to study the removal performance of phosphorus in vertical-flow constructed wetlands. The results showed that: compared with the natural zeolites, the removal rates of phosphorus by the three kinds of Zn-modified zeolites were greatly improved, especially for FeZn-LDHs. Moreover, the maximum adsorption capacity and the desorbed performance of phosphate were enhanced by the Zn-LDHs coated modification. The adsorption type of phosphate was converted from physical adsorption to chemical adsorption. Through reasonable selection of the type of zeolite and the method of modification, Zn-LDHs modified zeolites could be used to enhance the removal of nitrogen and phosphorus for the eutrophic water.
基于先前的研究成果，本研究选用锌基层状双氢氧化物（LDHs）开展实验。按照共沉淀法，在碱性条件下，通过氯化锌、氯化铁、氯化铝和氯化钴溶液合成了三种不同的锌基层状双氢氧化物（铁锌层状双氢氧化物、钴锌层状双氢氧化物和铝锌层状双氢氧化物），并将锌基层状双氢氧化物原位包覆在天然沸石表面。在柱体中填充天然沸石和三种锌基层状双氢氧化物改性沸石后，进行试验研究垂直流人工湿地对磷的去除性能。结果表明：与天然沸石相比，三种锌改性沸石对磷的去除率大幅提高，尤其是铁锌层状双氢氧化物。此外，锌基层状双氢氧化物包覆改性提高了磷酸盐的最大吸附容量和解吸性能。磷酸盐的吸附类型从物理吸附转变为化学吸附。通过合理选择沸石类型和改性方法，锌基层状双氢氧化物改性沸石可用于提高富营养化水体中氮和磷的去除效果。
