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The mechanism for the removal of Zn(II) by using coal mine drainage sludge (CMDS) was investigated by spectroscopic analysis and observations of batch tests using model materials. Zeta potential analysis showed that CMDS 25 (dried at 25 °C) and CMDS 550 (dried at 550 °C) had a much lower isoelectric point of pH (pH IEP ) than either goethite or calcite, which are the main constituents...
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