Preparation of SiO2@TiO2:Eu3+@TiO2 core double-shell microspheres for photodegradation of polyacrylamide

Haoyang Zou; Lan Wang; Huaizhi Tao; Yi Liu; Meiqi Chang; Shiyu Yao

doi:10.1039/c9ra06187h

Preparation of SiO₂@TiO₂:Eu³⁺@TiO₂ core double-shell microspheres for photodegradation of polyacrylamide

RSC Adv. 2019 Sep 30;9(53):30790-30796. doi: 10.1039/c9ra06187h. eCollection 2019 Sep 26.

Authors

Haoyang Zou¹, Lan Wang², Huaizhi Tao², Yi Liu¹, Meiqi Chang³, Shiyu Yao⁴

Affiliations

¹ State Key Laboratory of Supramolecular Structure and Materials, Jilin University Changchun 130012 P. R. China yiliuchem@jlu.edu.cn.
² Research Institute of Drilling and Production Engineering Technology, CNPC Chuanqing Drilling Engineering Co., Ltd Guanghan 618300 P. R. China.
³ State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050 P. R. China changmeiqi@mail.sic.ac.cn.
⁴ College of Physics, Jilin University Changchun 130012 P. R. China yaoshiyu@jlu.edu.cn.

Abstract

Recently, polyacrylamide (PAM) has been widely used in polymer flooding technology to enhance oil recovery and oil production. However, the difficulty in removing hydrolysed PAM (HPAM) from wastewater still seriously blocks the further application of polymer flooding in the oilfields. Herein, we demonstrate the preparation of SiO₂@TiO₂:Eu³⁺@TiO₂ core double-shell microspheres (STT) through a two-step solvothermal and sol-gel coating strategy. The as-prepared STT exhibits an ideal photocatalytic activity for the photodegradation of HPAM. More importantly, by using STT as the model, the correlation between fluorescence intensity and photocatalytic activity of the photocatalysts is investigated. The results suggest their oppositional relationship. Since many kinds of photocatalysts are utilized in the degradation of organic pollutants, it is believed that our work will not only promote the development of photocatalysis in the field of oil extraction, but also offer a convenient method for evaluating the photocatalytic activity of the photocatalysts.