Effects of hydrophilicity/hydrophobicity of humic acid components on the removal of bromide adsorbed on magnetic ion exchange resin

doi:10.12034/j.issn.1009-606X.220217

Abstract

Abstract:

The effect of different hydrophilic/hydrophobic humic acid on the removal of bromide adsorbed on magnetic ion exchange resin was studied. When the pH value of the solution was 7.0, the presence of four humic acid components (very hydrophobicity, slightly hydrophobicity, polar hydrophilicity, neutral hydrophilicity) reduced the removal efficiency of bromide. In contrast, the hydrophobic components of humic acid had the most significant adverse effect on the removal efficiency of bromide. Humic acid weakened the pH dependence of the adsorption process of bromide on resin. The fractions of humic acid can accelerate the adsorption rate of bromide. The adsorption equilibrium was attained quickly. With or without the fractions of humic acid, the kinetic processes of bromide adsorbed on resin agreed with the pseudo-second-order model. Because of the competitive adsorption, the humic acid fractions reduced significantly the equilibrium adsorption capacity of resin for bromide. The adsorption equilibrium can be simulated by Langmuir and Freundlich isotherm model. The existence of HA components can reduce the spontaneity of adsorption system, and the very hydrophobicity component had more significant effect. The results of this investigation were of great significance for the effective control of bromide in water sources.

Key words: magngetic ion exchange resin, humic acid, hydrophilicity, bromide, hydrophobicity, adsorption

摘要：

研究了不同亲疏水性腐殖酸对磁性离子交换(MIEX)树脂吸附去除溴离子的影响。溶液pH=7.0条件下，四种腐殖酸组分(强疏水性、弱疏水性、极性亲水、中性亲水)对溴离子的去除表现出不同程度的抑制作用。相较而言疏水性组分的不利影响较为显著。腐殖酸的存在减弱了溴离子在MIEX树脂上吸附过程对pH值的依赖性。腐殖酸组分能加速溴离子的吸附速率，溴离子在树脂上达到吸附平衡所需的时间被显著缩短。无论溶液中是否存在腐殖酸，拟二级动力学模型均能很好地拟合溴离子在树脂上的吸附过程，并且由于竞争吸附作用，腐殖酸组分导致溴离子在MIEX树脂上的平衡吸附容量显著减少。溴离子在MIEX树脂上的吸附平衡均可以通过Langmuir和Freundlich模型进行拟合。腐殖酸组分的存在会降低溴离子吸附体系的自发性，强疏水性组分的影响较为显著。该研究结果对于有效控制水源中溴离子具有重要意义。

关键词: 磁性离子交换树脂, 腐殖酸, 疏水性, 溴离子, 亲水性, 吸附

CLC Number:

TU991.2

LI Ling, Lei DING, Gang XUE, Yunhan JIA, Meiying ZHONG, Dewei ZHANG. Effects of hydrophilicity/hydrophobicity of humic acid components on the removal of bromide adsorbed on magnetic ion exchange resin[J]. The Chinese Journal of Process Engineering, 2021, 21(7): 807-816.

李凌, 丁磊, 薛岗, 贾韫翰, 钟梅英, 张德伟. 不同亲疏水性腐殖酸对磁性离子交换树脂吸附去除水中溴离子的影响[J]. 过程工程学报, 2021, 21(7): 807-816.

Figures/Tables 11

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Parameter	MIEX
Type	Macroporous
Structure	Polyacrylic
Zero charge point/MW	6.4
Particle size/mm	0.15
Water content/%	65~67.1
Magnetic material content/%	8.52
Total pore volume/(cm³/mL)	0.018
Exchange capacity/(meq/mL)	0.32~0.65
BET specific surface area/(m²/g)	21.47

Parameter	MIEX
Type	Macroporous
Structure	Polyacrylic
Zero charge point/MW	6.4
Particle size/mm	0.15
Water content/%	65~67.1
Magnetic material content/%	8.52
Total pore volume/(cm³/mL)	0.018
Exchange capacity/(meq/mL)	0.32~0.65
BET specific surface area/(m²/g)	21.47

Zeta potential/mV	Component of HA
Zeta potential/mV	VHC	SHC	PHC	NHC
pH=7.0	-12.70	-12.60	-9.54	-8.78

Zeta potential/mV	Component of HA
Zeta potential/mV	VHC	SHC	PHC	NHC
pH=7.0	-12.70	-12.60	-9.54	-8.78

Component of bromide solution	Pseudo-first order kinetic model				Pseudo-second order kinetic model
Component of bromide solution	q_e/ (mg/L)	k₁/min^-1	R²	SE	q_e/ (mg/L)	k₂/min^-1	R²	SE
Br^-	0.34	0.170	0.94	0.008	0.37	0.710	0.99	0.005
Br^-+HA (VHC)	0.05	0.294	0.95	0.001	0.05	10.056	0.98	0.001
Br^-+HA (SHC)	0.03	0.135	0.91	0.001	0.03	6.158	0.96	0.001
Br^-+HA (PHC)	0.07	0.292	0.94	0.002	0.07	7.150	0.97	0.002
Br^-+HA (NHC)	0.09	0.229	0.94	0.003	0.10	3.761	0.98	0.003