Recovery of Precious and Heavy Metals from Electronic Waste Via Hydrometallurgical Leaching

Recovery of Precious and Heavy Metals from Electronic Waste Via Hydrometallurgical Leaching

Supporting Information

Polyaniline-Poly(Vinylidene Fluoride) Blend Microfiltration Membrane and Its Spontaneous Gold Recovery Application

Gang Liu†*, Tang Liu Yan†, Yuan Zhao Wu†, Xiaohui Yi, Bin Chen & Run-Wei Li*

CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201 China

Zhejiang Province Key Laboratory of Magnetic Materials and Applied Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201 China

University of Chinese Academy of Sciences 19 A Yuquan Rd, Shijingshan District, Beijing, P.R.China 100049

†These authors contribute equally to this work.

*To whom all correspondence should be addressed. Email address: (G. Liu), (R.-W. Li)

Preparation of FITC Labeled-Aluminum Oxide Powders

The fluorescein 5(6)-isothiocyanate labeled aluminum oxide (FITC-Al2O3) powders were prepared via conjugation reaction of amino-terminated aluminum oxide powders with fluoro-tag FITC molecules, according to the procedure as shown in Scheme S1.1,2 1 g of aluminum oxide (Al2O3) powders, 1 mL of (3-aminopropyl)trimethoxysilane (APS) and 0.2 mL of ammonia (NH3·H2O) were added to 35 mL of ethanol under vigorous magnetic stirring. Then 5 mL of de-ionized water was added to the above mixture quickly. The reaction was maintained under vigorous magnetic stirring at room temperature for 48 h. Then the solid in the reaction mixture was collected by high-speed centrifugation, re-dispersed in 50 mL ethanol by the assist of ultrasonication and kept for 1 day to let the system stabilize. The centrifugation-dispersion-stabilizing process was repeated 3 times to thoroughly remove the unreacted (3-aminopropyl)trimethoxysilane from the APS-functionalized aluminum oxide (APS-Al2O3) powders. Then 10 mL of the suspension containing 0.2 g of APS-Al2O3 powders and 0.05 g of fluorescein 5(6)-isothiocyanate were added into 10 mL of ethanol under vigorous stirring to react for another 48 h in dark. The fluorescein 5(6)-isothiocyanate labeled aluminum oxide (FITC-Al2O3) was collected and purified using the centrifugation-dispersion-stabilizing processes as described above for 3 times to thoroughly remove the unreacted fluorescein 5(6)-isothiocyanate. The FITC-Al2O3 powders were kept in 50 mL ethanol in dark for later usage.

(Scheme S1)

Scheme S1 Preparation procedure for fluorescein 5(6)-isothiocyanate labeled aluminum oxide (FITC-Al2O3) powders.

Figure S1 The wide scan and N 1s core-level spectra of PANi-PVDF membranes with expected PANi:PVDF weight ratio of (a, b) 1:0, (c, d) 1:1 and (e, f) 1:3, and the wide scan and F 1s core-level spectra of PANi-PVDF membranes with expected PANi:PVDF weight ratio of (g, h) 0:1.

References

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