Highly efficient removal of diclofenac sodium from medical wastewater by Mg/Al layered double hydroxide-poly(m-phenylenediamine) composite
Highly efficient removal of diclofenac sodium from medical wastewater by Mg/Al layered double hydroxide-poly(m-phenylenediamine) composite
复制标题
Mg/Al层状双氢氧化物-聚间苯二胺复合材料高效去除医疗废水中的双氯芬酸钠
DOI：
10.1016/j.cej.2019.02.069
复制
发表时间：
2019
影响因子：
15.1
通讯作者：
Zeng Guangming
中科院分区：
文献类型：
--
作者：
Xiong Ting;Yuan Xingzhong;Wang Hou;Wu Zhibin;Jiang Longbo;Leng Lijian;Xi Kunfang;Cao Xuyang;Zeng Guangming
非甾体类双氯芬酸钠（DCF）是一种新型污染物，其污染问题日益引起人们的关注，如何有效去除废水中的DCF已成为一个亟待解决的问题。本研究制备了Mg/Al层状双氢氧化物-聚间苯二胺（LDH-PmPD）复合材料，对其进行了表征，并将其用于吸附去除DCF。吸附动力学，等温线以及各种影响因素，如，系统研究了pH、腐殖酸、离子种类和强度对DCF去除效果的影响。结果表明，LDH的存在减弱了PmPD的聚集密度，增大了比表面积，有利于DCF在LDH-PmPD表面的吸附。LDH-PmPD的最大吸附容量为588 mg/g，比常规吸附剂的吸附容量高上级。人工老化（100 d）实验表明LDH-PmPD具有良好的稳定性。此外，由于DCF与LDH-PmPD之间存在静电引力、π-π电子-给体-受体相互作用和N···HO氢键作用，吸附过程对医疗废水有很好的吸附效果。当吸附剂质量浓度为0.125 g/L时，对真实的医疗废水的DCF去除率在2 min内接近100%。这些结果表明，所制备的LDH-PmPD具有很好的处理DCF污染水的潜力。
The emerging pollutant non-steroidal diclofenac sodium (DCF) has aroused increasing concerns, and the efficient removal of DCF from wastewater is becoming an urgent problem. In this study, the Mg/Al layered double hydroxide-Poly(m-Phenylenediamine) (LDH-PmPD) composite was synthesized, characterized and used for DCF adsorptive removal. The adsorption kinetics, isotherms as well as various influence factors, e.g., pH, humic acid, ions species and strength on the DCF removal were systematically investigated. The results showed that the presence of LDH weakened the accumulating density of PmPD and increased the specific surface area, which favored DCF adsorption on LDH-PmPD surface. LDH-PmPD exhibited a maximum adsorption capacity of 588 mg/g, which was superior to those of the conventional adsorbents. The artificial aging (100 d) experiment indicates a good stability of LDH-PmPD. Furthermore, due to the presence of electrostatic attraction, π-π electron-donor-acceptor interaction and N···HO hydrogen bonding between DCF and LDH-PmPD, the adsorption process was very effective in medical wastewater. The DCF removal efficiency reached nearly 100% within only 2 min in real medical wastewater using 0.125 g/L adsorbent. All these suggested that the prepared LDH-PmPD has great potential for DCF-contaminated water treatment.