Study on the Adsorption Ability to Linear Alkylbenzene Sulfonate of Zeolite P Modified by Cetrimonium Bromide in Waste Water

doi:10.7503/cjcu20150667

Abstract

Abstract:

Zeolite P(PZ) was prepared by the natural clinoptilolite(Z) that was treated with lye, and then Z and PZ were modified by cationic surfactant cetrimonium bromide(CTMAB) to prepare ZC and PZC. The adsorption abilities of ZC and PZC to linear alkylbenzene sulfonate(LAS) were studied. The results indicated that the Si/Al ratio of PZ was 2, 58.8% lower than that of Z(4.85); the point of zero net charge(PZNC), specific surface area, pore radius and pore volume of PZ were higher than those of Z; the adsorption equilibrium was reached after 4 h. ZC and PZC had a maximum adsorption capacity for LAS at pH=2. The adsorption process was well fitted with pseudo-second order kinetic equation and Langmuir isothermal adsorption model. The amount of saturated adsorption of ZC and PZC are 12.658 and 27.100 mg/g, respectivey, showing that the adsorption process is described primarily for the monolayer and chemical adsorption, the adsorption of LAS on PZC is better than that on ZC in view of point of capacities and velocities.

Key words: Zeolite P, Cetrimonium bromide(CTMAB), Linear alkylbenzene sulfonate(LAS), Adsorption

CLC Number:

O647.32

TrendMD:

TAN Wenyuan, XU Man, ZENG Ying. Study on the Adsorption Ability to Linear Alkylbenzene Sulfonate of Zeolite P Modified by Cetrimonium Bromide in Waste Water[J]. Chem. J. Chinese Universities, 2016, 37(1): 65.

Figures/Tables 15

Fig.1 EDS of PZ(a) and Z(b)

Fig.2 SEM images of Z(A), ZC(B), PZ(C) and PZC(D)

Fig.3 XRD patterns of PZ(a) and Z(b)^ Z: Zeolite; Q: Quartz.

Fig.4 Mass titration curves of Z(A) and PZ(B)

Table 1 Results of BET analysis

Zeolite	S_BET/(m²·g^-1)	Total pore volume of adsorption(BJH)/(cm³·g^-1)	Most probable pore size(BJH)/nm
Z	12.794	0.0704	1.86
ZC	9.181	0.0700	1.94
PZ	42.053	0.2147	3.78
PZC	30.135	0.1827	1.92

Fig.5 IR spectra of CTMAB(a), ZC(b), PZC(c) and Z(d)

Table 2 Results of C, H, N measurement and CTMAB loading

Zeolite	C	H	N	Loading of CTMAB/(mg·g^-1)
ZC	8.31	1.54	0.45	11.71
PZC	16.2	2.99	0.95	24.73

Fig.6 Effect of pH on LAS adsorption onto ZC(a) and PZC(b)

Fig.7 Effect of temperature on LAS adsorption onto ZC(a) and PZC(b)

Fig.8 Effect of time on LAS adsorption onto ZC(a) and PZC(b)

Fig.9 Kinetic model fitting of Langmuir pseudo-first order(A) and pseudo-second order(B)

Table 3 Kinetic model fitting parameters of Langmuir pseudo-first and pseudo-second order

Equation type	Zeolite	R²	q_e/(mg·g^-1)	K/min^-1	Δq
Langmuir pseudo-first order	PZC	0.902	12.570	0.018	0.263
	ZC	0.950	3.640	0.015	0.199
Pseudo-second order	PZC	0.999	23.800	0.042	0.037
	ZC	0.999	9.390	0.011	0.025

Fig.10 LAS adsorption isotherms of Langmuir equation^The inset shows the varies of the adsorption capacity with the concentration at equilibrium.

Fig.11 Adsorption isotherms of Freundlich equation

Table 4 Fitting results of isothermal Langmuir and Freundlich equation

Zeolite	Langmuir equation			Freundlich equation
Zeolite	q_m	K_L	R²	K_F	n	r
PZC	27.100	1.157	0.989	14.440	5.464	0.950
ZC	12.658	0.177	0.994	4.547	4.254	0.818

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