欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

纳米δ-Bi2O3负载多孔沸石球填料对水体中Cr(VI)的吸附特征及其影响因素

王宏胜,王森,李悦,张雨,杨静轩,孔范龙*   

  1. (青岛大学环境科学与工程学院, 山东青岛 266071)
  • 出版日期:2020-01-10 发布日期:2020-01-10

Removal of Cr(VI) from aqueous solution using nano δ-Bi2O3 loaded porous zeolite sphere fillers: Adsorption characteristics and influencing factors.

WANG Hong-sheng, WANG Sen, LI Yue, ZHANG Yu, YANG Jing-xuan, KONG Fan-long*   

  1. (College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, Shandong, China).
  • Online:2020-01-10 Published:2020-01-10

摘要: 在水热条件下合成纳米δ-Bi2O3负载多孔沸石球填料(Bi-PZSF),研究其对水体中Cr(VI)的吸附性能(包括等温吸附、吸附动力学和吸附稳定性)以及溶解氧、pH等因素对吸附过程的影响及其吸附机理。结果表明:朗格缪尔模型和准二级动力学模型对实验结果具有良好的拟合度,在中性条件下,水体中的溶解氧含量对吸附速率影响较小,Bi-PZSF的最大吸附量为955.69 mg·kg-1,比天然沸石的吸附量提升了近120倍;Bi-PZSF在NO3-和SO42-的溶液中呈现出较强的选择吸收Cr(VI)能力,Cr(VI)去除率均在97%以上;同时,Bi-PZSF在吸附Cr(VI)后表现出高稳定性。Cr(VI)的去除主要是通过与附着在Bi-PZSF上的纳米δ-Bi2O3的表面羟基交换完成的。

关键词: 落叶松毛虫, 气象因子, 种群数量, 相对权重, 大兴安岭

Abstract: Nanoδ-Bi2O3loaded porous zeolite sphere fillers (Bi-PZSF) were synthesized under hydrothermal conditions. Adsorption properties of Bi-PZSF for Cr(VI), including adsorption kinetics, equilibrium capacity and stability, were analyzed. The factors affecting the adsorption, such as dissolved oxygen, pH and competitive anions, and the adsorption mechanism was examined. The adsorption process was well described by the Langmuir model and the pseudosecondorder model. Dissolved oxygen had little effect on adsorption rate under neutral conditions. Adsorption capacity of Cr(VI) was 955.69 mg·kg-1, which was nearly 120 times higher than that of natural zeolites. Bi-PZSF maintained excellent stability after adsorption and exhibited strong selective absorption of Cr(VI) in NO3-and SO42- solutions. The removal rates of Cr(VI) were always above 97%. The removal of Cr(VI) by Bi-PZSF mainly depended on nanoδ-Bi2O3 adhering to the sphere, which was achieved by exchanging hydroxyl groups from the surface of δ-Bi2O3.

Key words: Great Xing’an Mountains, relative weight., larch caterpillar, meteorological factors, population quantity