decontaminate
verb [ T ] uk/ˌdiː.kənˈtæm.ɪ.neɪt/ us/ˌdiː.kənˈtæm.ə.neɪt/
去除…的污染，清除（有害物质）;净化
to remove dangerous substances from something
Estimates of the amount of money needed to decontaminate the heavily polluted chemical installations vary. 对受重污染的化工设施进行净化预计需要多少资金说法不一。
Opposites: contaminatepollute