Enhanced removal of Pb(II) by supported nanoscale Ni/Fe on hydrochar derived from biogas residues
| Autor: | Zhi Tang, Tao Luo, Neng-min Zhu, Yan-sheng Xu, Yuanfang Deng |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Aqueous solution
Hydrogen Precipitation (chemistry) General Chemical Engineering Inorganic chemistry Nanoparticle chemistry.chemical_element Electron donor 02 engineering and technology General Chemistry 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering Catalysis chemistry.chemical_compound Hydrothermal carbonization Adsorption chemistry Environmental Chemistry 0210 nano-technology 0105 earth and related environmental sciences |
| Zdroj: | Chemical Engineering Journal. 292:224-232 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2016.01.113 |
| Popis: | A functionalized carbonaceous material was prepared via hydrothermal carbonization (HTC) of biogas residues and denoted as hydrochar (HC). The obtained HC was used to synthesize a hybrid (Ni/Fe-HC) to conduct Pb(II) removal from aqueous solution. SEM images show that Ni0/Fe0 was anchored tightly to HC particles due to a cellular structure of HC formed during HTC. Complete Pb(II) removal (>99.5%) was achieved within 1.5 h using Ni/Fe-HC whereas more than 85% of Pb(II) remained in bulk solution after 10 h with bare HC. SEP results indicate that Pb(II) was mainly associated with the fraction bound to carbonates and Fe–Mn oxides in the spent Ni/Fe-HC particles. Consequently, the adsorptive precipitation and specific adsorption dominated Pb(II) removal by Ni/Fe-HC despite minor reduction of Pb(II) to Pb0. However, the reduction of Pb(II) to Pb0 was conducted by the catalytically generated atomic hydrogen rather than Ni/Fe nanoparticles as electron donor. Ni/Fe-HC not only acted as an effective adsorbent for Pb(II) but also played a role of catalyst to generate atomic hydrogen. HC prepared with biogas residues can be used as an excellent supporting material to prepare a hybrid of Ni/Fe-HC for Pb(II) removal. |
| Databáze: | OpenAIRE |
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