由聚苯硫醚废料制备硫掺杂多孔碳处理含重金属废水  

Preparing the Sulfur-Doped Porous Carbon from Polyphenylene Sulfide Waste to Treat Wastewater Contained Heavy Metals

作　　者：苏文韬 蔡铭 车美红 刘亚纯 SU Wentao;CAI Ming;CHE Meihong;LIU Yachun(National&Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources,College of Chemistry and Chemical Engineering,Hunan Normal University,Changsha 410081,China)

机构地区：[1]湖南师范大学化学化工学院石化新材料与资源精细利用国家地方联合工程实验室,湖南长沙410081

出　　处：《工业技术创新》2022年第3期83-90,共8页Industrial Technology Innovation

基　　金：湖南省科技创新计划资助(项目批准号:2021RC1003);湖南省大学生创新创业训练计划项目(项目批准号:S202110542078)。

摘　　要：重金属导致的水体污染严重威胁人类健康。以废旧聚苯硫醚(PPS)为原料、氢氧化钾(KOH)为活化剂,探究理想活化温度,制备硫掺杂多孔碳材料,并考察其对Cd^(2+)等重金属离子的吸附性能。通过Boehm滴定分析、元素分析测定吸附剂的酸性基团数量和含硫量,得到最佳活化温度为450℃;通过吸附测试分析,得到优化吸附条件为Cd^(2+)初始浓度250 mg/L、吸附温度35℃、吸附时间90 min,镉离子去除率为98.74%。进一步研究发现:1)吸附效能与吸附剂表面酸性基团数量表现出较强相关性;2)吸附热力学方面,Freundlich模型较Langmuir模型表现出更佳的拟合程度;3)吸附动力学方面,吸附剂对Cd^(2+)的吸附更加符合Lagergren准二级吸附动力学模型,平衡吸附量为30.72 mg/g;4)经过5次N_(2)吸附—脱附循环实验,吸附率下降至稳定值。Water pollution caused by heavy metals seriously threatens human health.Using polyphenylene sulfide(PPS)waste as the raw material and potassium hydroxide(KOH)as the activator,the sulfur-doped porous carbon material was prepared by exploring the ideal activation temperature,and its adsorption performance for heavy metal ions such as Cd^(2+)was investigated.The amount of acid groups and sulfur content of the adsorbent were determined by Boehm titration analysis and elemental analysis,finding out the optimal activation temperature is 450℃.Through the analysis of adsorption test,the optimal adsorption conditions are as follows:initial concentration of Cd^(2+),250 mg/L;adsorption temperature,35℃;adsorption time,90 min.The removal rate of cadmium ion is 98.74%.Further findings:1)The adsorption efficiency has a strong correlation with the amount of acid groups on the adsorbent surface;2)In terms of adsorption thermodynamics,Freundlich model shows a better fitting extent than that of Langmuir model;3)In terms of adsorption kinetics,the adsorption of Cd^(2+)by the adsorbent is more in line with Lagergren pseudo-second order adsorption kinetic model,and the equilibrium adsorption capacity is 30.72 mg/g;4)After five N_(2)adsorption-desorption cycles,the adsorption rate decreased to a stable level.

关 键 词：聚苯硫醚 硫掺杂多孔碳 吸附剂 吸附动力学 N_(2)吸附—脱附 

分 类 号：TQ343[化学工程—化纤工业] TQ175.75