3D打印地质聚合物吸附剂及其吸附性能测试实验设计

Experimental Design for 3D Printing Geopolymer Adsorbent and Adsorption Properties Analysis

设计了3D打印地质聚合物吸附剂及其吸附性能教学实验。基于直写3D打印系统探究了3D打印模型设计、地质聚合物墨水合成、3D打印吸附剂成型、亚甲基蓝吸附性能和机理分析及吸附剂再生性能。结果表明,引入高岭土可显著提升地质聚合物墨水的打印性,成型高完成度的发泡六方蜂窝结构吸附剂,其对亚甲基蓝的吸附速率由颗粒内扩散和边界层扩散共同控制,吸附机制包括静电吸附、氢键作用和n-π作用。经高温氧化处理再生的吸附剂结构完整,2次循环测试后对亚甲基蓝的吸附效率仍能达到94.23%,具备突出的实际应用潜力。教学实践证明,开设该实验可充分激发学生的主观能动性,有助于培养学生团队协作精神和分析解决实际问题的能力。

A systematic teaching experiment of 3D printing geopolymer adsorbents and adsorption properties is designed.The 3D printing model design,geopolymer inks synthesis,controllable molding of 3D printing adsorbent,adsorption property testing and mechanism analysis,regeneration performance tests of adsorbents are systematically explored based on direct ink writing.The results show that the introduction of kaolin can significantly improve the printability of geopolymer ink.And the foamed hexagonal honeycomb adsorbents are printed with a high degree of completion.The adsorption rate of methylene blue is controlled by both the intraparticle diffusion and the boundary liquid layer diffusion.And the adsorption mechanism includes electrostatic adsorption,hydrogen bonding and n-πinteraction.The adsorbent regenerated by high-temperature oxidation treatment has a complete structure.The adsorption efficiency of methylene blue can still reach 94.23%after two cycles of testing,which has outstanding practical application potential.The teaching practice proves that this experiment can fully stimulate subjective initiative and help to cultivate ability of teamwork and analyzing and solving practical problems of students.