Citation: GENG Lin-Lin, LIN Zhi-Feng, MEI De-Jun, CHEN Si-Qi, WEI Jian-Wen, LIAO Lei. Amino Functionalized KIT-6: Two-Step Post-grafting and Pb²⁺ Adsorption Property[J]. Chinese Journal of Inorganic Chemistry, ;2019, 35(1): 65-72. doi: 10.11862/CJIC.2019.001 shu

Amino Functionalized KIT-6: Two-Step Post-grafting and Pb²⁺ Adsorption Property

Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology, Guilin, Guangxi 541004, China

Corresponding author: WEI Jian-Wen, jianwen988@126.com LIAO Lei, 976285986@qq.com
Received Date: 8 August 2018
Revised Date: 8 October 2018

Figures(13)

Mesoporous material KIT-6 was prepared using tetraethyl orthosilicate as the silicon source, triblock copolymer P123 as the template. The PEI functionalized PEI/KIT-6 was prepared with two-step post-grafting method, namely, 3-chloropropyltrimethoxysilane was firstly grafted onto KIT-6 and then polyethyleneimine (PEI) was further grafted. The samples were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), elemental analysis, N₂ adsorption-desorption and scanning electron microscopy (SEM). The Pb²⁺ adsorption performance was determined by inductively coupled plasma (ICP). The results showed that the average loading of the amino groups was 0.374 mmol·g^-1, and the modified KIT-6 remained highly ordered and no pore blockage occurred. With the dosage of 1 g·L^-1 PEI/KIT-6, the optimum pH value for adsorption of 100 mg·L^-1 Pb²⁺ was 6.0 at room temperature. The adsorption capacity of PEI/KIT-6 for Pb²⁺ increased firstly and then decreased with the increase of temperature, and the optimum adsorption temperature was 35℃. The adsorption capacity tends to reach equilibrium after 120 min. The pseudo-second-order kinetic model was found to be suited well for the entire adsorption process. Adsorption equilibrium data could be also described well by Langmuir and Freundlich isotherm models. The adsorption tends to take chemisorption of monolayer.
- KIT-6,
- lead ion,
- two-step post-grafting,
- chloropropyl functionalization,
- amino functionalization,
- PEI
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Amino Functionalized KIT-6: Two-Step Post-grafting and Pb2+ Adsorption Property

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Amino Functionalized KIT-6: Two-Step Post-grafting and Pb²⁺ Adsorption Property