CTAB-HAP@ZMS复合材料的制备及其对氟离子的吸附性能  

Preparation of CTAB-HAP@ZMS composites and their adsorption properties towards fluoride ions

作　　者：云蓉蓉 陈宇云[1,2,3] 董艳霞 王菲 张红丽[1,2,3] 刘曾玉 李翎 CHAYMA Chilouch YUN Rongrong;CHEN Yuyun;DONG Yanxia;WANG Fei;ZHANG Hongli;LIU Zengyu;LI Ling;CHAYMA Chilouch(School of Water and Environment,Chang’an University,Xi'an 710054,China;Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid region,Chang'an University,Ministry of Education,Xi’an 710054,China;Key Laboratory of Eco-hydrology and Water Security in Arid and Semi-Arid Regions of Ministry of Water Resources,Xi’an 710054,China)

机构地区：[1]长安大学水利与环境学院,西安710054 [2]长安大学,旱区地下水文与生态效应教育部重点实验室,西安710054 [3]水利部旱区生态水文与水安全重点实验室,西安710054

出　　处：《环境工程学报》2023年第10期3280-3290,共11页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金项目(41302206);陕西省自然科学基金项目(2023-JC-YB-130);中央高校基本科研业务费,长安大学(300102299205)。

摘　　要：使用贝壳和粉煤灰等固体废弃物为原材料,采用水热合成法将十六烷基三甲基溴化铵(CTAB)改性后的羟基磷灰石(HAP)负载到粉煤灰基沸石分子筛(ZMS)上,得到一种高效的吸附剂(CTAB-HAP@ZMS)用于去除氟离子。当投加量为8.0 g·L^(-1)、pH为3、温度为55℃时,CTAB-HAP@ZMS复合材料的最高吸附容量达到了10.4 mg·g^(-1),对10.0 mg·L^(-1)氟化钠溶液中F^(-)的去除率可以达到95%。动力学和热力学拟合参数表明吸附过程主要为多分子层式、自发、吸热的化学吸附。将此吸附剂用于处理模拟地热水(F-初始浓度为8.0 mg·L^(-1)),去除率达到89%,残留浓度低于我国饮用水质量标准中F-的浓度限值(1.0 mg·L^(-1))。此外,经4次循环再生吸附后,CTAB-HAP@ZMS复合材料仍然表现出较高的氟离子去除效率。该复合材料的制备不仅能使固体废物资源化,还在氟离子去除方面有广阔应用前景。In this study,solid wastes such as shell and fly ash were used as raw materials.Hydroxyapatite(HAP)modified by cetyltrimethyl ammonium bromide(CTAB)was loaded onto flyash-based zeolite molecular sieve(ZMS)by hydrothermal synthesis method.A highly efficient adsorbent(CTAB-HAP@ZMS)was obtained for fluoride removal.At the dosage of 8.0 g·L^(-1),pH 3,and 55℃,the highest adsorption capacity of CTABHAP@ZMS composite could reach 10.4 mg·g^(-1),and the removal rate of F-in 10.0 mg·L^(-1)sodium fluoride solution could reach 95%.The kinetic and thermodynamic fitting parameters showed that the adsorption process was mainly a type of multi-molecular layer,spontaneous and endothermic chemisorption.When the adsorbent was used to treat the simulated geothermal water with F-initial concentration of 8.0 mg·L^(-1),the removal rate reached 89%,and the F-residual content was lower than the concentration limit of F-in China's drinking water quality standard(1.0 mg·L^(-1)).In addition,CTAB-HAP@ZMS composite still showed a high fluoride removal efficiency after 4 cycles of regeneration and adsorption.The preparation of the composite material can not only make solid waste resources,but also have broad application prospects in fluoride ion removal.

关 键 词：改性羟基磷灰石 沸石分子筛 除氟 吸附 

分 类 号：X703[环境科学与工程—环境工程]