The study on the diatomic modified by PAM and applied to adsorpt cadmium ions (Cd2+ ) in the simulated sewage was made. The concentration of PAM, the pH as well as initial concentration were studied to investigate the influence of the modified diatomic on adsorpt ion of Cd2+. The conclusions indicate: compared with the raw diatomic, the adaption of modified diatomic to acid heavymetals sewage enhanced,and the modified diatomic capacity was 2. 75 times of the raw diatomic when the pH=l. 5 (d =200 mg/L) )the removal rates of the sewage with hign concentration of Cd2+ removed by modified diatomic was better; the structrue of moified diatomic enhanced and it was more advantageous in adsropting the electronegativity of Cd2+ s the surface of the modified diatomic was more smooth and with little inpurites, and PAM was adsorpted on it's surface or in it's pores with a style of moleculer layers.%研究用PAM包覆改性硅藻土并应用于处理含Cd2+模拟废水。探究了PAM浓度、pH值以及初始浓度的变化对改性硅藻土吸附Cd2+的影响。结论表明：与原土相比，改性硅藻土对酸性重金属废水的适应性增强，pH值为1.5时，改性硅藻土吸附(G0=200 mg/L)Cd2+的吸附容量是原土的2.75倍；改性硅藻土对高浓度的Cd2+废水去除效果比原土更好；改性后硅藻土的表面结构性能得到增强，有利于吸附带正电Cd2+；SEM结构表征表明，改性硅藻土表面光滑，杂质较少，PAM以分子层形式吸附在硅藻土的表面及其孔隙内。
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