| Autor: |
Qu, Qiang, Guo, Xiaohui, Shao, Zhijiang, Wang, Xiuzhang, Zhu, Mingqiang, Qiu, Ling |
| Zdroj: |
Biomass Conversion & Biorefinery; May2024, Vol. 14 Issue 9, p10201-10215, 15p |
| Abstrakt: |
Zanthoxylum branch became agricultural waste without proper utilization, and the pristine biochar (PB) had the limited removal capacity of Cr(VI) (21.75 mg g−1). In this study, zanthoxylum branch was fabricated to modified biochar (MZB) through impregnating with 0.4, 0.6, 0.8, and 1.0 mol L−1 Fe (NO3)3 solution and then pyrolyzing at 500 and 900 ℃. After sieving by batch adsorption experiment of Cr(VI), the optimal MZB was prepared with impregnating solution concentration of 0.4 mg L−1 and pyrolysis temperature of 900 ℃ (900MZB4), and displayed the outstanding Cr(VI) removal capacity (110.43 mg g−1). Besides, the effect of initial solution pH was evaluated, and removal process of Cr(VI) was a reaction of consuming protons. The fitting results of Langmuir model and pseudo-second-order kinetic model confirmed that the Cr(VI) removal reaction was a homogeneous chemisorption. Thermodynamic parameters demonstrated that the adsorption of Cr(VI) was an endothermic spontaneous process. The results of SEM and XRD suggested that zero-valent iron (Fe0) particles were located on 900MZB4 surface and participated in the removal reaction of Cr(VI). The XPS analysis indicated 78.37% of Cr(VI) was reduced to Cr(III) by the cooperation of oxygen-containing functional groups (OFG) and Fe0. More OFG and higher surface area (130.36 m2 g−1) revealed by FTIR and BET also contributed to the better characteristic of 900MZB4. In addition, 900MZB4 maintained removal efficiency at 81.22% after sixth regeneration cycles. Therefore, it is feasible to prepare high-efficient adsorbent from zanthoxylum branch for wastewater treatment. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink