羟基氧化铁对镉-腐殖酸的吸附研究

doi:10.19964/j.issn.1006-4990.2022-0643

Abstract

Abstract:

Iron nitrate and potassium hydroxide were used as raw materials to prepare hydroxyiron oxide samples to investigate the adsorption effect on Cd²⁺ as well as the adsorption isotherms and kinetic properties.XRD，SEM，BET，FT-IR and XPS were used to characterise the morphology and structure of the samples and to analyse the adsorption mechanism.The results showed that the experimentally produced hydroxyiron oxide product was α-FeOOH，which had good adsorption effect on Cd²⁺ at pH of 5~7.The adsorption capacity of α-FeOOH on Cd²⁺ was up to 20.34 mg/g at a temperature of 25 ℃，adsorbent dosage of 0.03 g，pH of 6，background humic acid mass concentration of 20 mg/L，and initial mass concentration of Cd²⁺ of 20 mg/L.The adsorption process followed the Langmuir and Freundlich isothermal adsorption model and quasi secondary kinetic model.The complexation of Cd²⁺ by hydroxyl groups on the surface of α-FeOOH and carboxyl groups on the surface of HA layer was its important adsorption mechanism.

Key words: hydroxy iron oxide, cadmium contamination, humic acid, complexation, adsorption

CLC Number:

X703

TANG Yifu, CAO Changchun, LÜ Peng. Study on adsorption of cadmium-humic acid by hydroxyiron oxide[J]. Inorganic Chemicals Industry, 2023, 55(8): 124-131.

Figures/Tables 11

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Table 1

Parameters for fitting kinetic model andparticle inner film diffusion model"

实验数值

准一级

动力学模型

准二级

动力学模型

颗粒内膜

扩散模型

q_e=

18.79 mg/g

q_e=

4.567 mg/g

q_e=

20.686 mg/g

k_di1=2.017 mg·g^-1·min^0.5

k_di2=0.388 mg·g^-1·min^0.5

k_di3=0.006 mg·g^-1·min^0.5

k₁=

0.001 mg/min

k₂=

0.007 14 mg/min

C_i1=6.652

C_i2=12.922

C_i3=18.728

R² =0.476

R² =0.999

$R 12$ =0.830

$R 22$ =0.974

$R 32$ =0.442

Table 1

Fig.9

Table 2

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温度/℃	实验数值q_e/ （mg·g^-1）	Langmuir			Freundlich
温度/℃	实验数值q_e/ （mg·g^-1）	q_m/（mg·g^-1）	k_L/（L·g^-1）	R²	k_F	n	R²
25	17.75	17.689	1.769	0.950	10.742	6.608	0.927
35	19.24	18.570	1.286	0.926	10.565	5.683	0.946
45	20.18	19.284	1.422	0.931	11.145	5.765	0.950

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Study on adsorption of cadmium-humic acid by hydroxyiron oxide

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