Interactions between cerium dioxide nanoparticles and humic acid: Influence of light intensities and molecular weight fractions Hongliang Dai , Tongshuai Sun , Ting Han , Xiang Li , Zechong Guo , Xingang Wang , Yong Chen School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, No. 2 Mengxi Road, Zhenjiang, 212018, China School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China Jiangxi Jindalai Environmental Protection Co., Ltd, Nanchang, 330100, China School Energy & Environment, Southeast University, 2 Sipailou Road, Nanjing, 210096, China Received 25 December 2020, Revised 1 February 2021, Accepted 5 February 2021, Available online 15 February 2021, Version of Record 18 February 2021.