伊利石硅渣蒸汽辅助合成麦羟硅钠石及其对Cu^(2+)的吸附研究

Steam-Assisted Synthesis of Magadiite from Illite Silica Residue and Its Adsorption of Cu^(2+)

以伊利石硅渣为原料,采用蒸汽辅助转化法(SAC)合成了高产率、高结晶度的纯相麦羟硅钠石(Magadiite)。采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)考察了钠硅比(n(Na_(2)O)/n(SiO_(2)))、晶化温度和晶化时间对合成样品结构及形貌的影响。结果表明,该体系的初步优化合成条件为钠硅比0.15,晶化温度170℃,晶化时间16 h,样品形貌为玫瑰花形(尺寸约12μm)。对合成的Magadiite进行Cu^(2+)吸附性能测试,探究了吸附剂用量、pH值、吸附时间和Cu^(2+)初始浓度对吸附效果的影响。在吸附剂用量为2 g/L,pH值为5,吸附时间为30 min时,Magadiite对Cu^(2+)的最大吸附量为25.99 mg/g。

The pure phase magadiite with high yield and high crystallinity was synthesized using illite silica residue by steam-assisted conversion(SAC).X-ray diffractometer(XRD)and scanning electron microscopy(SEM)were used to investigate the influences of Na_(2)O/SiO_(2) molar ratio,crystallization temperature(T)and crystallization time(t)on the structure and morphology of synthesized samples.The results show that the preliminary optimization of synthesis conditions of this system are n(Na_(2)O)/n(SiO_(2))=0.15,T=170℃,t=16 h,and the sample morphology is rosette-like(about 12μm).The Cu^(2+)adsorption test of magadiite synthesized was carried out,and the effects of adsorbent dosage,pH value,adsorption time and Cu 2+initial concentration on the adsorption effect were studied.The results show that when the adsorbent dosage is 2 g/L,the pH value is 5,and the adsorption time is 30 min,the maximum adsorption capacity of magadiite for Cu^(2+) is 25.99 mg/g.