Sequential separation of Cu(Ⅱ)/Ni(Ⅱ)/Fe(Ⅱ) from strong-acidic pickling wastewater with a two-stage process based on a bi-pyridine chelating resin
a State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
b College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
c South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510530, China
d Jiangsu Key Laboratory of Material Cycle and Pollution Control, School of Environment, Nanjing Normal University, Nanjing 210023, China
e Jiangsu Provincial Key Laboratory of Environmental Engineering, Jiangsu Provincial Academy of Environmental Science, Nanjing 210036, China
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