沸石咪唑酯骨架材料ZIF-67与多巴胺盐酸盐形成的复合材料,经煅烧后得到的钴氮碳(Co-NC)材料对甲基橙有一定的吸附作用。为了进一步提升Co-NC材料的吸附性能,在复合过程中加入十六烷基三甲基溴化铵(CTAB)合成了改性钴氮碳材料。通过场发射扫描电子显微镜和比表面积分析仪对材料进行了表征。结果表明:改性钴氮碳材料Co-NC-5%最佳煅烧温度为900℃,煅烧时间为3h,CTAB用量为0.048g;Co-NC-5%较Co-NC表面颗粒尺寸减小且有团聚,孔道更集中,比表面积增加了12.15887m2/g。当Co-NC-5%投加量为0.5g/L,甲基橙浓度为0.1mmol/L,吸附温度为25℃,反应180min后,甲基橙的吸附率高达97%,吸附过程符合准一级动力学模型且吸附剂具有良好的循环稳定性和回收性。
A cobalt-nitrogen-carbon material (Co-NC) was obtained by calcining the composite formed from zeolitic imidazolate framework ZIF-67 and dopamine hydrochloride,and the Co-NC exhibited certain adsorption capacity for methyl orange.In order to further improve the adsorption performance of the Co-NC,cetyl-trimethyl ammonium bromide (CTAB) was incorporated during the composite process to synthesize a modified cobalt-nitrogen-carbon material.The material was characterized by SEM and BET.The results showed that the optimal calcination temperature for modified Co-NC-5% was 900℃,with a calcination time of 3 hours and a CTAB dosage of 0.048g.The surface particle size of Co-NC-5% was smaller and agglomerated,and the pores were more concentrated than Co-NC,resulting in a specific surface area increase of 12.15887m2/g.Under the conditions of an Co-NC-5% dosage of 0.5g/L,methyl orange concentration of 0.1mmol/L,adsorption temperature of 25℃,and reaction time of 180 min,the adsorption rate of methyl orange reached as high as 97%.The adsorption process followed the pseudo-first-order kinetic model,and the adsorbent had good stability and recyclability.
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基金资助
江苏省高等学校自然科学研究面上项目(20KJD610003);南京师范大学中北学院“大学生创新创业训练计划”项目(2024YJ89003)
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