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The purpose of this study was to elucidate the characteristics and mechanisms of adsorption and desorption for heavy metals by micro and nano-sized biogenic CaCO 3  induced by  Bacillus subtilis , and the pH effect on adsorption was investigated. The results showed that the adsorption characteristics of Cd 2+  and Pb 2+  are well described by the Langmuir adsorption isothermal equation, and the maximum adsorption amounts for Cd 2+  and Pb 2+  were 94.340 and 416.667 mg/g, respectively. The maximum removal efficiencies were 97% for Cd 2+ , 100% for Pb 2+ , and the desorption rate was smaller than 3%. Further experiments revealed that the biogenic CaCO 3  could maintain its high adsorption capability for heavy metals within wide pH ranges (3–8). The FTIR and XRD results showed that, after the biogenic CaCO 3  adsorbed Cd 2+  or Pb 2+ , it did not produce a new phase, which indicated that biogenic CaCO 3  and heavy metal ions were governed by a physical adsorption process, and the high adsorptive capacity of biogenic CaCO 3  for Cd 2+  and Pb 2+  were mainly attributed to its large total specific surface area. The findings could improve the state of knowledge about biogenic CaCO 3  formation in the environment and its potential roles in the biogeochemical cycles of heavy metals.

Adsorption and Desorption Characteristics of Cd2+ and Pb2+ by Micro and Nano-sized Biogenic CaCO3