Effective removal of Cr(VI) from aqueous solution based on APTES modified nanoporous silicon prepared from kerf loss silicon waste
| Autor: | Wenhui Ma, Zudong He, Ziheng Yang, Li Yi, Hu Huanran, Xiuhua Chen, Shaoyuan Li |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Chromium
Silicon Materials science Health Toxicology and Mutagenesis chemistry.chemical_element Protonation 010501 environmental sciences 01 natural sciences Nanopores symbols.namesake Adsorption Environmental Chemistry Ingot 0105 earth and related environmental sciences Aqueous solution Langmuir adsorption model General Medicine Hydrogen-Ion Concentration Pollution Isotropic etching Kinetics Chemical engineering chemistry symbols Hybrid material Water Pollutants Chemical |
| Zdroj: | Environmental Science and Pollution Research. 27:10899-10909 |
| ISSN: | 1614-7499 0944-1344 |
| Popis: | Recently, the recycling of kerf loss silicon waste has trigged much attention due to the rapid growth of PV market. In this study, 3-aminopropylethoxysilane (APTES)-functionalized nanoporous silicon (NPSi) hybrid materials were prepared by nanosilver-assisted chemical etching (Ag-ACE) of kerf loss silicon waste derived from diamond-wire saw cutting silicon ingot process. The resulting APTES-NPSi indicated high-effective adsorption ability of Cr(VI) from aqueous solution, which was highly pH dependent, and the maximum adsorption capacity reached up to 103.75 mg/g after 60 min at room temperature. The adsorption kinetics and adsorption isotherms were in good agreement with pseudo-second-order model and Langmuir isotherm. Additionally, the Cr(VI) up-take mechanism was carefully investigated and ascribed to the Cr(VI) adsorption on the protonated anime groups by chemical chelating reaction in which the Cr(VI) was reduced to Cr(III). It was worth mentioning that the APTES-NPSi maintained excellent adsorption capacity after five successive regenerated cycles. Therefore, the work would pave the way for recycling of silicon cutting waste and the potential of Cr(VI) removal from aqueous solution based on the modified NPSi. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink