Institute of Hydrogeology and Environmental Geology Academy of Geological Sciences 050061;
Key Laboratory of Groundwater Remediation of Hebei Province and China Geological Survey 050061;
Technical Centre for Soil and Rural Ecology and Environment of Ecology and Environment 100012;
Resource and Environmental College Geology University 050031.;
Nanoscale iron particles; Green tea; Hexavalent chromium; Groundwater remediation;