期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 718, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.137299
关键词
Sulfamethoxazole; Low concentrations; Sludge biochar; Carbon nanotube; Adsorption mechanisms
资金
- National Natural Science Foundation of China [51878523, U1703120, 51508430]
- 111 Project of China
- Fundamental Research Funds for the Central Universities [WUT: 193108003, 195208004, 2019IVA032]
- Scottish Government's Rural and Environment Science and Analytical Services Division (RESAS) [S100007-00]
A novel adsorbent of sludge biochar (SBC) and multi-walled carbon nanotube (CNT) composite was synthesized (CNT-SBC) to remove low concentrations of sulfamethoxazole (SMX) from water. The key factors of dose, contact time, pH and temperature were investigated. Higher dose of adsorbents provided more active sites for SMX adsorption. The effect of pH was due to the electrostatic interaction. Increasing the temperature was beneficial to SMX adsorption, which was a spontaneous endothermic process and the strength of the spontaneous increased with CNT supporting. As pseudo-second-order, Elovich, Langmuir and Freundlich models fitted the experimental data better, this suggested that both physisorption and chemisorption played vital roles during the adsorption process. In addition, liquid film diffusion was the main rate-limiting step of adsorption. Compared with SBC (5.43 x 10(3) mu g g(-1)), CNT-SBC-1 (CNT:SBC = 1:2), CNT-SBC-2 (CNT:SBC = 1:4) and CNT-SBC-3 (CNT:SBC 1:6) exhibited better adsorption performance with up to 2.35 x 10(4), 1.49 x 10(4) and 1.22 x 10(4) mu g g(-1) at 25 degrees C, respectively. The characterization analysis demonstrated that the stronger adsorption capacity of CNT-SBC was mainly attributed to the pore filling, functional groups complexation and pi-pi interaction. In summary, as art efficient and environment-friendly adsorbent, CNT-SBC has promising potential for low concentrations of SMX and other emerging contaminants removal from water. (C) 2020 Elsevier B.V. All rights reserved.
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