Li Chengle, Yao Jing, Zhang Tian C, Xing Wenya, Liang Ying, Xiang Mingli
School of Architecture and Environmental Engineering, Sichuan University, Chengdu, 610041, China E-mail:
Beijing Engineering Corporation Limited of Power China, Beijing, 100020, China.
Water Sci Technol. 2017 Dec;76(11-12):2895-2906. doi: 10.2166/wst.2017.459.
In this study, surfactant modified zeolite-clinoptilolite (SMZ) by CPB (cetylpyridinium bromide) was used for simultaneous removal of ammonium, nitrate and phosphate in synthetic wastewater, and the sorption properties of SMZ were determined and compared with natural zeolite. Results showed that natural clinoptilolite had good affinity for ammonium (8.940 mg/g), but not for nitrate (0.427 mg/g) and phosphate (0.801 mg/g). With the increase of surfactant loading from 5 g/L to 40 g/L, the sorption capacity for nitrate increased from 0.462 mg/g to 4.661 mg/g. when the surfactant loading is 40 g/L, the SMZ has a phosphate adsorption capacity of 2.119 mg/g. The SMZ had a significant enhancement on nitrate and phosphate sorption, could simultaneously remove ammonium, nitrate and phosphate at specific conditions, with removal efficiency up to 85.2%, 83.1% and 56.7%, respectively. Orthogonal experiments showed that ammonium concentration was the most important factor for ammonium sorption on SMZ. Surfactant loading was the major factor for nitrate and phosphate sorption. With the increase of surfactant loading from 5 g/L to 40 g/L, the sorption capacity for nitrate increased from 0.462 mg/g to 4.661 mg/g. When the surfactant loading is 40 g/L, the SMZ has the best phosphate adsorption capacity 2.119 mg/g. Samples were characterized by X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET). Semi-empirical quantum mechanics molecular simulation indicated that electrostatic attraction existed between CPB and dihydrogen phosphate ion. Results indicate that SMZs might have great potential of removing cations and anions simultaneously in the aquatic environment, which is good for eutrophication control and nutrients removal.
在本研究中，采用十六烷基溴化吡啶（CPB）对沸石 - 斜发沸石进行表面活性剂改性，得到表面活性剂改性沸石 - 斜发沸石（SMZ），用于同步去除合成废水中的铵、硝酸盐和磷酸盐，并测定了SMZ的吸附性能，并与天然沸石进行了比较。结果表明，天然斜发沸石对铵具有良好的亲和力（8.940 mg/g），但对硝酸盐（0.427 mg/g）和磷酸盐（0.801 mg/g）的亲和力不佳。随着表面活性剂负载量从5 g/L增加到40 g/L，对硝酸盐的吸附容量从0.462 mg/g增加到4.661 mg/g。当表面活性剂负载量为40 g/L时，SMZ对磷酸盐的吸附容量为2.119 mg/g。SMZ对硝酸盐和磷酸盐的吸附有显著增强，在特定条件下可同时去除铵、硝酸盐和磷酸盐，去除效率分别高达85.2%、83.1%和56.7%。正交实验表明，铵浓度是影响铵在SMZ上吸附的最重要因素。表面活性剂负载量是影响硝酸盐和磷酸盐吸附的主要因素。随着表面活性剂负载量从5 g/L增加到40 g/L，对硝酸盐的吸附容量从0.462 mg/g增加到4.661 mg/g。当表面活性剂负载量为40 g/L时，SMZ具有最佳的磷酸盐吸附容量2.119 mg/g。通过X射线衍射（XRD）和布鲁诺尔 - 埃米特 - 泰勒（BET）对样品进行了表征。半经验量子力学分子模拟表明，CPB与磷酸二氢根离子之间存在静电吸引力。结果表明，SMZ在水环境中可能具有同时去除阳离子和阴离子的巨大潜力，这有利于富营养化控制和营养物质去除。
