摘要
以碳粉为造孔剂、海藻酸钠辅助成球,制备出羟基磷灰石(HA)多孔球形颗粒用作吸氟材料。通过提高HA颗粒的投加量和吸附温度,可以提高HA除氟能力和除氟效率。HA作为吸附剂比较适合于处理低浓度的含氟溶液。吸氟效果随吸附时间延长而提高,10 h后趋缓;弱酸条件利于HA除氟剂的物理静电吸附和化学离子交换吸附。HA多孔球颗粒除氟是一个自发(ΔG^(0)<0),吸热(ΔH^(0)>0),熵增(ΔS^(0)>0)的过程。吸附的热力学和动力学过程较好地符合Langmuir模型和拟二级动力学模型,表明化学吸附起主要作用。
Hydroxyapatite(HA)porous spherical particles were prepared using carbon powder as a pore forming agent and sodium alginate as an auxiliary spheroid for fluorine absorbing material.As the dosage of HA particles and adsorption temperature increase,the fluoride removal ability and efficiency improve.HA adsorbent is more suitable for treating low concentration fluorine liquids.The fluoride absorption efficiency improved with the prolongation of adsorption time,reaching near-equilibrium after 10 hours.Weak acid conditions facilitated both physical electrostatic adsorption and chemical ion exchange adsorption of HA fluorine removal agent.The removal of fluoride by HA porous spherical particles was a spontaneous process(ΔG^(0)<0),endothermic(ΔH^(0)>0)and entropy increase(ΔS^(0)>0).The adsorption thermodynamic and kinetic processes were well described by the Langmuir isotherm model and pseudo-second-order kinetic model,respectively,indicating that chemical adsorption plays a major role.
作者
张诗晟
宋健平
何世斌
朱庆霞
ZHANG Shisheng;SONG Jianping;HE Shibin;ZHU Qingxia(Tianjin Key Laboratory of Advanced Fibers and Energy Storage,School of Material Science and Engineering,Tiangong University,Tianjin 300387,China;Yue Kiln Celadon Research Institute of Shangyu District,Shaoxing 312399,China;Chongqing Vauxton Nano Technology Co.,Ltd.,Chongqing 402460,China)
出处
《中国陶瓷》
北大核心
2025年第7期40-47,共8页
China Ceramics
基金
基金资助:天津市科技项目(Grant No.20YDTPJC01690)
天津工业大学大学生创新创业项目(202410058157)。
关键词
羟基磷灰石
除氟
多孔颗粒
吸附过程
热动力学
Hydroxyapatite
Defluorination
Porous spherical particles
Adsorption process
Thermodynamics and kinetics
