Microstructure Analysis of Attapulgite Clay Minerals

Land is the foundation of human being. However, with the rapid development of human society, soil is no longer clean, and soil remediation is imminent. Passivation of heavy metals in soils by passivates is a relatively economical, rapid and reasonable treatment measure. In this paper, the microstructure of attapulgite clay minerals and acid-modified attapulgite clay minerals are qualitatively and quantitatively analyzed by scanning electron microscopy. The results show that the attapulgite clay minerals have rough micro-surface, more synapses on the surface after modification, higher porosity, higher pore fractal dimension, larger probability entropy, and larger passivation potential of heavy metals.