摘要
为提高三嗪基有机多孔吸附材料的比表面积和对水中偶氮染料的吸附性能,以三聚氰胺、4,4'-(9-亚茀基)二苯胺(FDA)和对苯二甲醛为原料,利用席夫碱反应制备了系列富氮含芴多孔聚合物(NRFPP)。将NRFPP用于水中酸性橙7的吸附去除,通过FTIR、XRD、SEM、BET表征及单因素吸附实验、等温线吸附实验,考察了FDA含量(以三聚氰胺和FDA的总物质的量计,下同)对NRFPP结构组成、微观形貌、表面特性、吸附性能的影响。结果表明,调整FDA含量可以控制自由体积大小,调控NRFPP的比表面积,FDA含量越大,NRFPP的比表面积越大,吸附去除水溶液中酸性橙7的性能越好。由FDA含量为25%制备的NRFPP-5的比表面积为418.82m^(2)/g,在酸性橙7初始质量浓度为200mg/L、NRFPP-5用量为0.005g、溶液pH=7、吸附时间为120min、吸附温度为303K的最优化条件下,NRFPP-5首次对酸性橙7最高吸附量为189.44mg/g,第4次循环使用时,其平衡吸附量为180.23mg/g,较首次使用时下降了4.9%。NRFPP-5吸附水溶液中酸性橙7的等温线模型符合Freundlich模型,是以物理吸附为主导的多层非均相表面吸附机制,吸附依赖于NRFPP-5上的不饱和位点和酸性橙7的质量浓度,同时受多种因素影响。
In order to improve the specific surface area of triazinyl organic porous adsorbent materials and their adsorption performance for azo dyes in water,a series of nitrogen-rich fluorene porous polymer(NRFPP)were prepared by Schiff alkali reaction using melamine,4,4'-(9-cocoinyl)diphenylamine(FDA)and terephthalendehyde as raw materials,and used for aqueous Acid Orange 7 adsorption removal.The effects of FDA content(based on the total molar amount of melamine and FDA,the same below)on the structure composition,micro-morphology,surface characteristics and adsorption performance of NRFPP were analyzed by FTIR,XRD,SEM and BET characterization as well as single factor adsorption experiment and isotherm adsorption experiment.The results showed that the free volume and the specific surface area of NRFPP could be regulated by adjusting FDA content.The larger the FDA content,the higher the specific surface area of NRFPP,and the better the adsorption and removal of Acid Orange 7 in aqueous solution.The specific surface area of NRFPP-5 prepared with 25%FDA content was 418.82 m^(2)/g.Under the optimal conditions of Acid Orange 7 initial mass concentration 200 mg/L,NRFPP-5 dosage 0.005 g,solution pH=7,adsorption time 120 min,and adsorption temperature 303 K,the highest adsorption capacity of NRFPP-5 for Acid Orange 7 was 189.44 mg/g at the first time,and the equilibrium adsorption capacity was 180.23 mg/g at the fourth cycle,decreased by 4.9%compared with the first use.The adsorption isotherm model of NRFPP-5 for Acid Orange 7 in aqueous solution conformed to the Freundlich model,which was an adsorption mechanism of multilayer heterogeneous surface dominated by physical adsorption,and the adsorption depended on the unsaturated site on NRFPP-5 and the mass concentration of Acid Orange 7,which was affected by many factors.
作者
潘孝昆
陆桂楠
李坚
任强
汪称意
PAN Xiaokun;LU Guinan;LI Jian;REN Qiang;WANG Chenyi(School of Materials Science and Engineering,Changzhou University,Changzhou 213164,Jiangsu,China)
出处
《精细化工》
北大核心
2025年第12期2694-2702,2716,共10页
Fine Chemicals
基金
江苏省高校基础科学研究重大项目(22KJA430002)
中国石油和化学工业联合会科技指导计划项目(2024-YF-5)。
关键词
多孔聚合物
含芴结构
酸性橙7
比表面积
吸附率
功能材料
porous polymers
fluorene-containing structure
Acid Orange 7
specific surface area
adsorption rate
functional materials
