Enhanced adsorptive removal of Cr(III) from the complex solution by NTA-modified magnetic mesoporous microspheres

被引:5
|
作者
Liang, Linqing [1 ]
Wang, Jiahong [1 ,2 ]
Tong, Xinhao [1 ]
Zhang, Shutong [1 ]
机构
[1] Shaanxi Univ Sci & Technol, Sch Environm Sci & Engn, Xian 710021, Peoples R China
[2] Zhejiang Wenzhou Res Inst Light Ind, Wenzhou 325003, Zhejiang, Peoples R China
基金
中国国家自然科学基金;
关键词
Nitrilotriacetic acid modified magnetic mesoporous microspheres; Cr(III) adsorption; High salt; COPPER ADSORPTION; METALS REMOVAL; HEAVY-METALS; ACID; NANOPARTICLES; ADSORBENTS; SILICA; PB; EQUILIBRIUM; PB(II);
D O I
10.1007/s11356-022-19039-8
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The Fe3O4@nSiO(2)@mSiO(2)/NTA (FNMs-NTA) was prepared by grafting magnetic mesoporous microspheres with nitrilotriacetic acid (NTA) and applied as an adsorbent for the removal of Cr(III) from complex solutions. Some characterization techniques including Brunauer-Emmett-Teller (BET), Fourier transform infrared spectrometer (FT-IR), X-ray diffraction (XRD), small-angle X-ray diffraction (SAXS), vibrating sample magnetometer (VSM), and thermal gravimetric analysis (TGA) were used to characterize functional groups and pore structure of FNMs-NTA, which proved that NTA was successfully decorated onto the magnetic Fe3O4@nSiO(2)@mSiO(2) (FNMs) and FNMs-NTA featured a regular mesoporous structure. The batch adsorption of Cr(III) by FNMs-NTA exhibited high adsorption capacity (16.0 mg center dot g(-1) at pH 3.0, and 25 degrees C). Adsorption data followed Freundlich isotherm and adsorption process was a spontaneous adsorption process. Moreover, the kinetics of adsorption were well explained by pseudo-second-order kinetic model. FNMs-NTA showed resistance to interfering inorganic cations (Na+, Ca2+) and complexing agents (EDTA). Furthermore, FNMs-NTA exhibited remarkable regeneration performance and easy separation under external magnetic field. X-ray photoelectron spectroscopy (XPS) analysis showed the FNMs-NTA had excellent adsorption ability for Cr(III) because of the ion exchange and surface complexation.
引用
收藏
页码:45623 / 45634
页数:12
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