Fabrication of nano-sized Ca(OH)2 with excellent adsorption ability for N2O4--颗粒学报PARTICUOLOGY

Du, Y., Meng, Q., Hou, R., Yan, J., Dai, H., & Zhang, T. (2012). Fabrication of nano-sized Ca(OH)2 with excellent adsorption ability for N2O4. Particuology, 10(6), 737–743. https://doi.org/10.1016/j.partic.2012.03.010

Fabrication of nano-sized Ca(OH)₂ with excellent adsorption ability for N₂O₄

Yucheng Du ^a *, Qi Meng ^a, Ruiqin Hou ^c, Jing Yan ^a, Hongxing Dai ^b, Tong Zhang ^c

a Key Lab of Advanced Functional Materials, Ministry of Education of China, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
b Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
c Beijing Special Engineering Design and Research Institute, Beijing 100028, China

10.1016/j.partic.2012.03.010

Volume 10, Issue 6, December 2012, Pages 737-743

Received 15 September 2011, Revised 27 February 2012, Accepted 6 March 2012, Available online 20 June 2012.

E-mail: ychengdu@bjut.edu.cn

Highlights

► Nano-size Ca(OH)₂ was synthesized from CaO in the presence of PEG and SDS.

► Nano-size Ca(OH)₂ samples are fabricated using digestion method.

► Nano-size Ca(OH)₂ with the specific surface area as high as 58 m²/g and 92 m²/g.

► Samples P-10-5 and S-0.086-5 have uniform pore sizes of 5–14 nm and 5–9 nm.

► Samples P-10-5 and S-0.086-5 have 59.43% and 94.67% high NO_x removal rate.

Abstract

Uniform nano-sized calcium hydroxide (Ca(OH)₂) monocrystal powder was synthesized from calcium oxide in a surfactant solution via a digestion method by decreasing the surface tension of the reaction system to control the growth of crystalline Ca(OH)₂. The Ca(OH)₂ monocrystal powder samples were characterized by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and Fourier transform-infrared spectroscopy (FT-IR). The NO_x adsorption ability of the samples was evaluated, and the influence of various types and concentrations of surfactants on powder agglomeration and then the specific surface area in the precipitation process were studied. The specific surface area of the samples was found as high as 58 m²/g and 92 m²/g and the particle size, 300–400 nm and 200–300 nm in the presence of 10 wt% PEG600 and 0.086 mL/L SDS at a reaction time of 5 h, respectively. The product has an exceptionally strong adsorption ability for NO_x, which makes it a highly promising adsorbent for emission control and air purification.

Graphical abstract

Keywords

Nano-sized Ca(OH)₂; Surfactant; Digestion method; NO_x collecting

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