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\begin{document}

\title{Easier extraction of rare earth elements (REEs) by Janus particle}



\author[1]{Haipeng Liu}%
\author[1]{zhuo chen}%
\author[2]{Jifang Yuan}%
\author[1]{Deming Du}%
\author[1]{Fuxin Liang}%
\author[3]{jianhong Xu}%
\author[1]{Zhenzhong Yang}%
\affil[1]{Affiliation not available}%
\affil[2]{Tsinghua University}%
\affil[3]{the State Key Lab of Chemical Engineering}%


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  \date{June 15, 2024}


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\begin{abstract}
Deep treatment of wastewater containing low concentration rare earth
elements (REEs) is significant for environmental remedy and full
utilization of resources. Effective extraction of such system at a high
phase ratio remains challenging. A new strategy is proposed to perform
the highly efficient extraction by using the paramagnetic Janus particle
(PJP) as the functional solid surfactant. A larger interface area is
provided by forming the emulsion in the presence of PJP, facilitating a
faster mass transfer. The ion contained extractant emulsion droplets
stabilized with the PJP can be easily collected from the aqueous phase
with a magnet. Taking neodymium (Nd3+) contained aqueous solution (100
ppm) as the model of low concentration wastewater, a high extraction
efficiency over 99\% can be achieved within a short time. The PJP can be
easily isolated from the extractant by using a stronger magnet, which
can preserve the same capability as the original one.%
\end{abstract}%



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