Removal of Pb(ii) and Cr(vi) from aqueous solutions using the prepared porous adsorbent-supported Fe/Ni nanoparticles

Jiwei Liu; Min Dai; Shaoxian Song; Changsheng Peng

doi:10.1039/c8ra04324h

Removal of Pb(ii) and Cr(vi) from aqueous solutions using the prepared porous adsorbent-supported Fe/Ni nanoparticles

RSC Adv. 2018 Sep 14;8(56):32063-32072. doi: 10.1039/c8ra04324h. eCollection 2018 Sep 12.

Authors

Jiwei Liu^{1

2}, Min Dai³, Shaoxian Song⁴, Changsheng Peng^{1

3}

Affiliations

¹ The Key Lab of Marine Environmental Science and Ecology of Ministry of Education, Ocean University of China Qingdao 266100 China pcs005@ouc.edu.cn.
² School of Environment, Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, Collaborative Innovation Center for Regional Environmental Quality, Tsinghua University Beijing 100084 China.
³ School of Environmental and Chemical Engineering, Zhaoqing University Zhaoqing 526061 China.
⁴ School of Resources and Environmental Engineering, Wuhan University of Technology Wuhan 430070 China.

Abstract

In this study, Fe/Ni nanoparticles supported by a novel fly ash-based porous adsorbent (FBA-Fe/Ni) for Cr(vi) and Pb(ii) removal were investigated. In order to enhance the reactivity of zero-valent iron (ZVI), ZVI particles were deposited on the surface or in the inner pores of FBA as a support material and Ni nanoparticles were introduced. FBA was prepared with the solid waste such as Enteromorpha prolifera, bentonite and fly ash. FBA-Fe/Ni was characterized via Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction and the Brunauer-Emmett-Teller model and energy-dispersive spectrometry. The effects of various parameters on Cr(vi) and Pb(ii) removal by FBA-Fe/Ni, such as FBA-Fe/Ni dosage, pH of the solution, reaction temperature, Cr(vi) and Pb(ii) concentrations, co-existing ions and ionic strength were discussed. The possible removal mechanisms were proposed and the results indicated that there was a three-step reaction including the adsorption of Cr(vi) and Pb(ii) on the surface of FBA-Fe/Ni, the subsequent reduction and precipitation. The removal capacity of Cr(vi) and Pb(ii) by FBA-Fe/Ni was 25.07 mg g^-1 and 164.19 mg g^-1 at 303 K with an initial concentration of 1000 mg L^-1 and FBA-Fe/Ni dosage of 0.20 g. In conclusion, this work demonstrated that FBA-Fe/Ni was a promising alternative material for Cr(vi) and Pb(ii) removal.