摘要
采用对比的方式，分别对天然蛇纹石和经700％改性的蛇纹石做了等温吸附实验，研究蛇纹石对重金属Cd2’的吸附性能，并探讨了影响吸附的因素和吸附机理。吸附剂用量、溶液的pH值对2种蛇纹石的吸附率均有较大影响。随着吸附剂用量的增加，天然蛇纹石和热改性蛇纹石对cd2＋的吸附率都逐渐增加，且吸附率都超过了60％。在同等吸附剂用量条件下，经7000C改性的蛇纹石的吸附能力要明显强于未改性的天然蛇纹石。当pH值为3—6时，2种蛇纹石对Cd2＋的吸附量都随着pH值的增加而显著增大；当pH值为6～10时．对cd2＋的吸附量趋于稳定。两种蛇纹石均符合Freundlich方程，且拟合度较好，对重金属cd2＋有较强的吸附能力；经700℃改性的蛇纹石对cd2＋的饱和吸附量为8．19mg／g，约等于天然蛇纹石饱和吸附量的2倍。
An isothermal adsorption test was made between natural serpentine and thermal-modified serpentine at 700℃ to remove the heavy ion Cd2＋. This paper discusses the factors and mechanism of adsorption. Adsorption ratio depends largely on adsorbent quantity and solution pH value. Adsorption ratio rises up to over 60% with more adsorbent. Thermal-modified serpentine is obviously better than natural serpentine in adsorption ability with the same amount of adsorbent. The adsorption capacity of both increases as pH value rises from 3 to 6, and tends to be stabilized as pH value is 6 - 10. Two kinds of serpentine are in accordance with Freundlich formula with a good fitting. The maximum adsorption quantity of thermal-modified serpentine at 700℃ is 8. 19 mg/g, approximately twice that of the natural serpentine.
出处
《资源与产业》
2015年第4期56-60,共5页
Resources & Industries
关键词
天然蛇纹石
热改性蛇纹石
除镉
吸附量
natural serpentine
thermal-modified serpentine
cadmium adsorption
adsorption quantity
