(1. 北華大學 化學與生物學院，吉林132013；
2. 江蘇大學 化學化工學院，鎮(zhèn)江 212013；
3. 中國人民解放軍第359醫(yī)院，鎮(zhèn)江 212001)
摘 要: 選用具有高比表面、強吸附能力的二氧化硅納米空心微球作吸附劑，對Pb2+、Cu2+及Cr3+的吸附性能進行測試。利用Langmuir 線性方程對吸附平衡數(shù)據(jù)進行擬合。結(jié)果表明：二氧化硅納米空心微球?qū)χ亟饘匐x子具有較高的飽和吸附量，分別為1.256、0.681、0.563 mmol/g。飽和吸附量與重金屬離子的共價指數(shù)及電荷密度有很強的相關性，隨著共價指數(shù)增加或電荷密度的降低，飽和吸附量增大；吸附常數(shù)與重金屬離子電場強度(有效核電荷數(shù))有關，隨著有效核電荷數(shù)的增加，吸附常數(shù)增大。此吸附過程具有化學吸附特征，再生的吸附劑可以重復使用。
關鍵字: 納米SiO2空心微球；重金屬離子吸附；Langmuir 線性方程
（1. School of Chemistry and Biology, Beihua University, Jilin 132013, China;
2. Faculty of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China;
3. Chinese PLA 359 Hospital, Zhenjiang 212001, China）
Abstract:The adsorbability of hollow SiO2 nanospheres of high adsorption capacity and large specific surface area for Pb2+, Cu2+, and Cr3+ ions was investigated. The absorbtion equilibrium data were fitted by Langmuir linear equation. The results show that hollow SiO2 nanospheres have high adsorption capacity for heavy metal ions, the adsorption capacities for Pb2+, Cu2+ and Cr3+ ions are 1.256, 0.681, and 0.563 mmol/g, respectively. As the fitting data shown, there is a strong correlation between the adsorption capacity and ion characteristics (covalent index and charge density). The adsorption capacity increases with the increase in covalent index or decrease in charge density. The adsorption constant is related to electric field intensity of ion (effective nuclear charge), and the adsorption constant increases with the increase in effective nuclear charge of ion. This adsorption process should belong to chemisorption. The regenerated adsorbent can be reused many times.
Key words: hollow SiO2 nanosphere; heavy metal ion adsorbtion; Langmuir linear equation
