Influence of initial pH on the precipitation and crystal morphology of calcium carbonate induced by microbial carbonic anhydrase

► Influence of initial pH on CaCO3 precipitation induced by microbial CA. ► Both the intracellular and extracellular CA promoted CaCO3 precipitation. ► The higher pH favored catalytic action of microbial CA on CaCO3 precipitation. ► The CaCO3 crystals were mainly calcite in the presence of microbial CA. ► The morphology of crystals induced by microbial CA changed with time.