Multifunctional ZnO-porous carbon composites derived from MOF-74(Zn) with ultrafast pollutant adsorption capacity and supercapacitance properties

Linjie Wang; Penghao Tang; Jie Liu; Aobo Geng; Chi Song; Qiang Zhong; Lijie Xu; Lu Gan

doi:10.1016/j.jcis.2019.07.015

Multifunctional ZnO-porous carbon composites derived from MOF-74(Zn) with ultrafast pollutant adsorption capacity and supercapacitance properties

J Colloid Interface Sci. 2019 Oct 15:554:260-268. doi: 10.1016/j.jcis.2019.07.015. Epub 2019 Jul 8.

Authors

Linjie Wang¹, Penghao Tang², Jie Liu³, Aobo Geng¹, Chi Song¹, Qiang Zhong¹, Lijie Xu⁴, Lu Gan⁵

Affiliations

¹ College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, People's Republic of China.
² College of Science, Northeastern University, Shenyang 110006, Liaoning, People's Republic of China.
³ School of Chemical Biology and Materials Engineering, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, People's Republic of China.
⁴ College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, Jiangsu, People's Republic of China.
⁵ College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, People's Republic of China. Electronic address: ganlu@njfu.edu.cn.

PMID: 31301526
DOI: 10.1016/j.jcis.2019.07.015

Abstract

In the present study, the ZnO-porous carbon (ZnO-C) composites were prepared by pyrolyzing MOF-74 (Zn) precursor at different pyrolysis temperatures. The ZnO-C composites were endowed with ultrafast organic dye adsorption capability and promising supercapacitance properties due to the existence of abundant pores within the composite structures. Having a surface area of 782.971 m²/g and pore volume of 0.698 m³/g, the composite pyrolyzed at 1000 °C (ZnO-C1000) exhibited the best performance for organic pollutant uptake. Specifically, 50 mg of ZnO-C1000 could remove all the Rhodamine B dye from 100 mL aqueous solution within 0.5 h even the dye concentration was as high as 40 mg/L. It was also shown that the ZnO-C composites could preserve their adsorption capability in a wide pH range, and keep promising dye adsorption stability after consecutive adsorption/desorption cycles. Furthermore, the ZnO-C900 exhibited a specific capacitance of 197.84 F/g as the supercapacitance electrode with good stability (∼97.8% capacitance retention after 1000 cycles). The overall results indicate that the prepared ZnO-C composites have multi-application potentials which can be utilized as efficient pollutant absorbents as well as electrode materials for supercapacitors.

Keywords: Dye adsorption; Metal organic frameworks; Porous carbon; Pyrolysis; Supercapacitor.