Adsorption of Cetyltrimethylammonium Bromide on Different-sized Calcium Oxalate Monohydrate and Dihydrate Crystals

doi:10.15541/jim20150293

Abstract

Abstract:

The aim of this study was to compare the adsorption difference of cetyltrimethylammonium bromide (CTAB) on nano/micron calcium oxalate monohydrate (COM) and dihydrate (COD) crystals, so as to explore the stone formation mechanism. The crystal phase transformation before and after adsorption was analyzed by XRD and FT-IR. Adsorbed amount of nano/micron COM and COD to CTAB was detected by colorimetry. Zeta potentials of crystals were measured by Zeta potential analyzer. The adsorption curves of large-sized COM and COD (3 μm and 10 μm) formed a platform with increase of c (CTAB), while the small-sized COM and COD (50 nm, 100 nm and 1 μm) showed linear-type. The adsorbed amounts of COM and COD crystals were reduced with increase of crystal size. Adsorbed amounts of CTAB on COM were more than COD with the same size, because CTAB is more likely to adsorb to the negative charges on the COM surface. In conclusion, adsorption of crystals is related to the specific surface area and crystal structure. The adsorption quantity, absolute values of zeta potential of crystals and electrostatic repulsive-force are increased with the decrease of crystal size because of the increased specific surface area and exposed oxalate ions. The adsorption could inhibit the aggregation of urine crystals thus reduce the risk of calcium oxalate stone formation.

Key words: crystal size, cationic surfactant, adsorption model, calcium oxalate

CLC Number:

TQ174

GAN Qiong-Zhi, WEN Xiao-Ling, DING Yi-Ming, OUYANG Jian-Ming. Adsorption of Cetyltrimethylammonium Bromide on Different-sized Calcium Oxalate Monohydrate and Dihydrate Crystals[J]. Journal of Inorganic Materials, 2016, 31(2): 159-164.

Figures/Tables 8

Fig. 1 XRD patterns of COM (A) and COD crystals (B) with different sizes after CTAB adsorption for 24 h (a1, b1): 50 nm; (a2, b2): 100 nm; (a3, b3): 1 μm; (a4, b4): 3 μm; (a5, b5): 10 μm

Fig. 2 FT-IR spectra of COM (A) and COD crystals (B) with different sizes after CTAB adsorption (a1, b1) 50 nm; (a2, b2) 100 nm; (a3, b3) 1 μm; (a4, b4) 3 μm; (a5, b5) 10 μm

Fig. 3 Absorption amount changes of different sizes of COM (A) and COD (B) crystals in different concentrations of CTAB solution (a, f) 50 nm; (b, g) 100 nm; (c, h) 1 μm; (d, i) 3 μm; (e, j) 10 μm

Table 1 The maximum adsorption amount and adsorption density of CTAB on different sizes of COM and COD crystals at different surface areas, pore volumes and pore diameters

Crystal type	Crystal size (SEM characterization)	Specific surface area (S_BET) / (m²·g^-1)	Pore volume /(mm³·g^-1)	Pore diameter /nm	Maximum adsorption amount (Q_max) /(mg·g^-1)	Adsorption density (Γ^#) / (N·nm^-2)
COM-50 nm	47.70± 6.20 nm	26.30	49.20	7.49	53.90	3.39
COM-100 nm	92.10±10.40 nm	14.70	37.30	10.10	42.70	4.78
COM-1 μm	0.91±0.22 μm	13.60	37.70	11.10	35.60	4.31
COM-3 μm	2.65±0.43 μm	1.51	3.30	6.71	12.60	13.80
COM-10 μm	9.67±1.76 μm	0.83	1.30	6.37	11.10	22.10
COD-50 nm	44.10±8.70 nm	40.80	95.70	9.37	40.30	1.63
COD-100 nm	98.30±8.10 nm	21.40	40.90	7.63	35.80	2.76
COD-1 μm	0.92±0.31 μm	9.12	31.50	13.80	23.70	4.29
COD-3 μm	3.41±0.57 μm	1.36	1.20	4.61	8.97	10.90
COD-10 μm	9.58±0.97 μm	0.80	1.10	5.71	5.13	10.60

Fig. 4 Diagrams of CTAB molecules adsorbed on the surface of calcium oxalate crystals Phase 1: CTAB molecules formed monolayer absorption on the surface of calcium oxalate crystals Phase 2: CTAB molecules completely covered on crystal surface with bilayer or micelle

Fig. 5 Zeta potential change of different sizes of COM and COD crystals in different c (CTAB) (a) COM-50 nm; (b) COD-50 nm; (c) COM-3 μm; (d) COD-3 μm

Fig. 6 Diagram of CTAB adsorption on calcium oxalate crystals

Fig. 7 The maximum adsorption amount of CTAB to different sizes of COM and COD crystals

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