Preparation and Characterization of Humidity Control Material Based on Diatomite/Ground Calcium Carbonate Composite

doi:10.15541/jim20150287

Abstract

Abstract:

Humidity control material is a kind of healthy environmental friendly material. The diatomite/ground calcium carbonate composite humidity control material (DE/GCC) was prepared by calcinations using diatomite (DE) and ground calcium carbonate (GCC) as raw materials. The obtained samples were characterized by X-ray diffraction, field emission scanning electron microscope, Fourier transform infrared spectroscope and low-temperature nitrogen adsorption method to determine the mineral compositions, functional groups, microstructure, surface element compositions and pore structure, respectively. The moisture absorption performance of samples were tested under high relative humidity conditions (RH=70%, 80%, 90%) and the constant temperature of 30℃. The moisture absorption dynamics and humidity control mechanism were analyzed. It is indicated that the calcium silicate and calcium hydroxide are formed in the DE/GCC during the calcinations process. Compared with the raw materials, the content of mesopore increases in the DE/GCC sample, which is in favor of the capillary condensation. After 36 h test in the environment with relative humidity of 70%, 80% and 90%, the moisture contents of DE/GCC reach 7.213%, 11.159% and 14.701%, which are about 2.1, 2.9 and 3.0 fold as those of DE, respectively. The moisture absorption kinetics follows the pseudo-second-order model.

Key words: diatomite, ground calcium carbonate, humidity control material, calcium silicate, calcium hydroxide

CLC Number:

TD98

HU Zhi-Bo, YAN Yang, ZHENG Shui-Lin, SUN Qin, YIN Sheng-Nan. Preparation and Characterization of Humidity Control Material Based on Diatomite/Ground Calcium Carbonate Composite[J]. Journal of Inorganic Materials, 2016, 31(1): 81-87.

Figures/Tables 7

Fig. 1 XRD patterns of DE, GCC and DE/GCC

Fig. 2 Fourier transform infrared spectra of DE, GCC and DE/GCC

Fig. 3 SEM image (a) of DE and corresponding EDS pattern (b), low magnification (c) and high magnification (d) SEM images of GCC, as well as SEM image (e) of DE/GCC and corresponding EDS pattern (f)

Fig. 4 Nitrogen adsorption-desorption isotherms and BJH adsorption pore diameter curve of DE and DE/GCC

Fig. 5 Moisture absorption isotherm of DE, GCC and DE/ GCC

Fig. 6 Fitting results of pseudo-second-order kinetic model for moisture absorption process of DE and DE/GCC

Table 1 Parameters of pseudo-second-order kinetic model for moisture absorption process of DE and DE/GCC

Material	RH/%	Kinetic parameters			q_{36h, exp}/%	q_{36h, cal}/%
Material	RH/%	K/(g·h^-1·g^-1)	q_e/%	R²	q_{36h, exp}/%	q_{36h, cal}/%
DE	90	0.3679	5.0581	0.9998	4.958	4.984
	80	0.3425	3.9640	0.9996	3.858	3.885
	70	0.4751	3.5662	0.9997	3.488	3.509
DE/GCC	90	0.0051	18.2983	0.9610	14.701	14.101
	80	0.0083	13.8274	0.9885	11.159	11.133
	70	0.0166	8.7017	0.9958	7.213	7.289

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