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以固体废物粉煤灰(FA)为原料,通过掺杂稀土铈元素结合碱熔融法改性制备了铈/FA复合吸附剂(Ce/MFA),并用XRD,SEM及EDS进行了表征.以吸附水溶液中Cd2+为反应模型,研究了各种制备条件对复合材料吸附性能的影响.结果表明:1)当所取FA、无水Na2CO3和Ce(SO4)2·4H2O的质量比为1∶2∶0.045,焙烧温度为800℃,焙烧时间为2h时,制得的Ce/MFA吸附剂对于水体中的Cd2+具有最佳去除效果;2)当Ce/MFA的投加量为10g/L,吸附时间和吸附温度分别为2.5h和25℃时,对起始质量浓度为800mg/L模拟废水中Cd2+的去除率可达99.67%,比FA增大了37倍,实现了对废水中高含量Cd2+的有效去除;3)通过表征发现FA掺杂铈元素-碱熔融后会使其结构发生明显变化,活性增大,吸附性能显著增强.作为一种性价比高的吸附剂,Ce/MFA用于废水中Cd2+的去除极具开发应用价值.
The cerium / FA composite adsorbent (Ce / MFA) was prepared by solid state pulverized coal ash (FA) as raw material and modified by rare earth cerium and alkali fusion method and characterized by XRD, SEM and EDS. The results show that: 1) When the mass ratio of FA, anhydrous Na2CO3 and Ce (SO4) 2 · 4H2O is 1: 2: 0.045, the effect of various preparation conditions on the adsorption properties of the composites is studied. , The calcination temperature is 800 ℃, the calcination time is 2h, the obtained Ce / MFA adsorbent has the best removal effect for Cd2 + in water; 2) When the Ce / MFA dosage is 10g / L, the adsorption time and When the adsorption temperature was 2.5h and 25 ℃ respectively, the removal rate of Cd2 + in the simulated wastewater with initial mass concentration of 800mg / L was up to 99.67% and 37 times higher than that of FA, and the effective removal of high Cd2 + in wastewater was achieved ; 3) It is found that the structure of FA-doped cerium-base melts after the FA melting significantly changes and its activity increases and the adsorption performance is significantly enhanced. As a cost-effective adsorbent, Ce / MFA is used as adsorbent for Cd2 + Remove the great value of development and application.