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Removal of Cr(VI) from Aqueous Solution by Polypyrrole/Hollow Mesoporous Silica Particles

Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China
Institute of Industrial Science, the University of Tokyo, 4-6-1 Komaba, Meguro-ku 153-8505, Tokyo, Japan
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(4), 686;
Received: 9 March 2020 / Revised: 30 March 2020 / Accepted: 31 March 2020 / Published: 5 April 2020
The removal of Cr(VI) in wastewater plays an important role in human health and environment. In this work, polypyrrole/hollow mesoporous silica particle (PPy/HMSNs) adsorbents have been newly synthesized by in-situ polymerization, which prevent the aggregation of pyrrole in the process of polymerization and exhibit highly selective and powerful adsorption ability for Cr(VI). The adsorption process was in good agreement with the quasi-second-order kinetic model and the Langmuir isotherm model. And the maximum adsorption capacity of Cr(VI) was 322 mg/g at 25 °C. Moreover, the removal rate of Cr(VI) by PPy/HMSNs was ~100% in a number of binary systems, such as Cl/Cr(VI), NO3/Cr(VI), SO42−/Cr(VI), Zn2+/Cr(VI), Fe3+/Cr(VI), Sn4+/Cr(VI), and Cu2+/Cr(VI). Thus, the PPy/HMSNs adsorbents have great potential for the removal of Cr(VI) in wastewater. View Full-Text
Keywords: polypyrrole/hollow mesoporous silica particle; chromium(Cr); adsorption polypyrrole/hollow mesoporous silica particle; chromium(Cr); adsorption
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Du, L.; Gao, P.; Liu, Y.; Minami, T.; Yu, C. Removal of Cr(VI) from Aqueous Solution by Polypyrrole/Hollow Mesoporous Silica Particles. Nanomaterials 2020, 10, 686.

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