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OALib Journal期刊
ISSN: 2333-9721
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edta吸附特性及其对α半水脱硫石膏晶形的影响
Keywords: 无机非金属材料,α半水脱硫石膏,调晶剂,吸附,晶体形貌
Abstract:
？用扫描电镜、显微红外、紫外吸收光谱、x光电子能谱等研究了乙二胺四乙酸(简称edta)在α半水石膏表面的吸附特性,从晶体生长角度分析了edta的调晶机理。结果表明:edta在α半石膏表面吸附为化学吸附,其吸附等温线符合langmuir方程,最大吸附量为15.2mg/g,吸附层厚度6.5nm;edta改变了α半水石膏晶体生长习性与形貌,晶体在c轴生长被抑制,晶形有长棒状转变为短柱状,且晶体尺度增大；edta调晶效果对ph值较敏感,edta在中性区间调晶效果最佳。edta通过羟基与ca2+的络合作用选择吸附在α半水石膏(111)面,抑制其c轴方向生长,使晶体沿c轴方向生长的比较优势被削弱甚至逆转,导致α半水石膏晶体生长习性和形貌发生变化。
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