• 标题：Fabrication of hypercrosslinked hydroxyl-rich solid phase extractants for cesium separation from the salt lake brine
• 关键词：Phenols,Solid phase extractants,Ion exchange,Cesium,Salt lake brine
• 作者：Zihao Xu, Meng Rong, Qiyu Meng, Haoyu Yao, Shan Ni, Li Wang, Huifang Xing, Hongnan Qu, Liangrong Yang, Huizhou Liu

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In this work, two hypercrosslinked hydroxyl-rich polymers (HCP-P and HCP-R) were facilely prepared through a one-pot Friedel-Crafts polymerization of phenol, resorcinol and formaldehyde dimethyl acetal, respectively. HCP-P and HCP-R were investigated for their ability to separate Cs+ from the salt lake brine via ion-exchange reaction between Cs+ and O−Na+. The Cs+ adsorption isotherms of HCP-P and HCP-R follow the Langmuir model, and their adsorption capacities reach 249.64 mg g−1 and 259.97 mg g−1 , surpassing most of commercial materials like AMP-PAN (81 mg g−1 ) and TAM-5 (191.8 mg g−1 ). The Cs+/K+ separation factors (S.F.) of HCPs can reach 12.4 even in the presence of high concentrations of K+ (C(K+) /C(Cs+) = 712.5). Notably, HCPs could retain more than 90% of the adsorption capacities after 5 successive adsorption-desorption cycles. Besides, X-ray photoelectron spectroscopy (XPS), FT-IR spectra and TEM-EDS analysis revealed the ion exchange mechanism of the Cs+ adsorption process. This work demonstrated the excellent application potential of hypercrosslinked