Diffusion and Adsorption of Copper Ion in HPMC-modified Bentonite

doi:10.11988/ckyyb.20240104

Abstract

Abstract:

A series of through-diffusion tests were carried out to explore the diffusion and adsorption behaviors of Cu²⁺ in bentonites modified with hydroxypropyl methylcellulose (HPMC). The test results were compared with those of untreated bentonite. Pollute V7.0 was employed to quantitatively evaluate the impact of HPMC on the performance of bentonite in intercepting Cu²⁺. The diffusion test results indicated that when the HPMC content reached 2% and 5%, the capacity of bentonite adsorbing Cu²⁺ decreased by 40% and 46%, respectively, while the diffusion coefficient of Cu²⁺ dropped by 7% and 34%, correspondingly. The results from Pollute V7.0 demonstrated that adding 2% and 5% HPMC to sodium bentonite enhanced the performance of bentonite for adsorbing Cu²⁺ by factors of 1.34 and 2.03, respectively. Overall, the findings of this study offer valuable information for assessing the performance of HPMC-modified bentonite.

Key words: geosynthetic clay liners, bentonite, hydroxypropyl methylcellulose, diffusion, adsorption

CLC Number:

TU57

Cite this article

WANG Bao, HU Ye-hao, ZHU Jia-jia, ZHANG Di, ZHOU Hao-ran. Diffusion and Adsorption of Copper Ion in HPMC-modified Bentonite[J]. Journal of Changjiang River Scientific Research Institute, 2025, 42(4): 127-126.

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URL: http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20240104

http://ckyyb.crsri.cn/EN/Y2025/V42/I4/127

Figures/Tables 11

Fig.1 Test sodium bentonite

Table 1 Basic properties of the sodium bentonite [11]

含水率/%	密度/ (g·cm^-3)	阳离子交换容量/ (meq·100g^-1)^*	蒙脱石含量/%	液限/ %	塑限/ %
6.56	2.65	64.87	70.56	314	40

Table 1 Basic properties of the sodium bentonite [11]

含水率/%	密度/ (g·cm^-3)	阳离子交换容量/ (meq·100g^-1)^*	蒙脱石含量/%	液限/ %	塑限/ %
6.56	2.65	64.87	70.56	314	40

Fig.2 Hydroxypropyl methylcellulose used in the present study

Fig.3 Device for the through-diffusion test

Table 2 Basic properties of bentonite specimens used in the through-diffusion test

试样种类	试样质量/g	试样厚度/mm	含水率/%	孔隙率
天然膨润土	86.50	7.70	106.73	0.74
HPMC2膨润土	87.95	8.59	103.30	0.76
HPMC5膨润土	94.35	10.11	129.27	0.79

Table 2 Basic properties of bentonite specimens used in the through-diffusion test

试样种类	试样质量/g	试样厚度/mm	含水率/%	孔隙率
天然膨润土	86.50	7.70	106.73	0.74
HPMC2膨润土	87.95	8.59	103.30	0.76
HPMC5膨润土	94.35	10.11	129.27	0.79

Fig. 4 Diffusion of Cu2+ in natural bentonite and HPMC-modified bentonites (with HPMC dosages of 2% and 5%)

Fig.5 SEM images of bentonite specimens with diffused Cu2+

Table 3 Modelling parameters for Cu2+ transfer

膨润土种类	尾矿库长度/m	尾矿库宽度/m	含水层深度/m	地下水流速/ (m·a^-1)	含水层孔隙率	淋滤液水头/m	淋滤液中 Cu²⁺浓度/ (mg·L^-1)	膨润土厚度/ mm	膨润土渗透系数/ (10^-11m·s^-1)	膨润土扩散系数/ (10^-11m²·s^-1)	膨润土吸附分配系数/ (mL·g^-1)
天然膨润土	500	100	3	1	0.3	0.3	5 000	7.70	9.48	2.76	6.59
HPMC2膨润土	500	100	3	1	0.3	0.3	5 000	8.59	6.42	2.57	3.97
HPMC5膨润土	500	100	3	1	0.3	0.3	5 000	10.11	2.52	1.82	3.58

Table 3 Modelling parameters for Cu2+ transfer

膨润土种类	尾矿库长度/m	尾矿库宽度/m	含水层深度/m	地下水流速/ (m·a^-1)	含水层孔隙率	淋滤液水头/m	淋滤液中 Cu²⁺浓度/ (mg·L^-1)	膨润土厚度/ mm	膨润土渗透系数/ (10^-11m·s^-1)	膨润土扩散系数/ (10^-11m²·s^-1)	膨润土吸附分配系数/ (mL·g^-1)
天然膨润土	500	100	3	1	0.3	0.3	5 000	7.70	9.48	2.76	6.59
HPMC2膨润土	500	100	3	1	0.3	0.3	5 000	8.59	6.42	2.57	3.97
HPMC5膨润土	500	100	3	1	0.3	0.3	5 000	10.11	2.52	1.82	3.58

Fig.6 Time-dependent curves of the concentration of Cu2+ in the bottom of bentonite specimens

Table 4 Change in breakthrough time under different variation amplitudes of parameters

参数	变化幅度	击穿时间/d
参数	变化幅度	HPMC2	HPMC5
扩散系数	水平1(-20%)	361	738
	水平2(-10%)	340	679
	对照(0%)	320	628
	水平3(+10%)	302	584
	水平4(+20%)	286	547
吸附分配系数	水平1(-20%)	316	622
	水平2(-10%)	318	625
	对照(0%)	320	628
	水平3(+10%)	322	631
	水平4(+20%)	324	635

Table 4 Change in breakthrough time under different variation amplitudes of parameters

参数	变化幅度	击穿时间/d
参数	变化幅度	HPMC2	HPMC5
扩散系数	水平1(-20%)	361	738
	水平2(-10%)	340	679
	对照(0%)	320	628
	水平3(+10%)	302	584
	水平4(+20%)	286	547
吸附分配系数	水平1(-20%)	316	622
	水平2(-10%)	318	625
	对照(0%)	320	628
	水平3(+10%)	322	631
	水平4(+20%)	324	635

Fig.7 Comparison of sensitivity index of different parameters

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