As for the Cr~(3+), it does not need to change the characteristic of diatomite,the rate can attain 90%. Besides, the model of diatomite adsorbing Cr~(3+) matches the Freundlich adsorption isotherms well.

• 对于Cr~(3+)来说,由于硅藻土吸附重金属的能力很强,所以不用改性硅藻土对其的去除率就能达到90%25,硅藻土对Cr~(3+)的吸附模型较好的符合Freundlich吸附等温式。