氨基磺酸改性海藻酸钠的制备及对Fe3+的吸附

doi:10.3969/j.issn.1673-5854.2022.05.002

Abstract

Abstract:

Coating adsorbent materials on drainage facilities could effectively prevent chemical clogging of tailings dams. In this study, a sulfamic acid-modified sodium alginate adsorbent(MSA) was prepared using sodium alginate(SA) as the matrix, sodium periodate as the oxidant, and sulfamic acid as the modified material. The structure was characterized by Fourier transform infrared spectroscopy and scanning electron microscope, and the adsorption behavior of MSA on Fe³⁺ was also studied. The results showed that MSA was prepared successfully by introducing —NHSO₃H into alginic acid dialdehyde(ADA). Molecular size and molecular chain gap of MSA increased after adsorbing Fe³⁺. The optimal conditions for the adsorption of Fe³⁺ by MSA were that the initial mass concentration of Fe³⁺ was 200 mg/L, the pH value was 2, the adsorption time was 240 min, and the adsorption temperature was 25 ℃. Under these conditions, the maximum Fe³⁺ adsorption capacity of MSA was 151 mg/g. The adsorption process conformed to the pseudo-second-order kinetic model and Langmuir adsorption isotherm, and adsorption of Fe³⁺ by MSA was a monolayer chemical adsorption. Adsorption thermodynamic analysis showed that the adsorption process was a spontaneous process, and the increase of temperature was not conducive to the progress of the adsorption reaction.

Key words: sodium alginate, sulfamic acid, adsorption material, iron ion

CLC Number:

TQ35
TQ31

Yue WANG, Jun YANG, Wei QIU, Yani GUO. Preparation and Adsorption of Fe³⁺ Using Sulfamic Acid Modified Sodium Alginate[J]. Biomass Chemical Engineering, 2022, 56(5): 8-14.

Figures/Tables 7

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References 20

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吸附条件 adsorption condition		Fe³⁺吸附量/(mg·g^-1) Fe³⁺ adsorption capacity
pH值 pH value	0.5	3.66
	1.0	20.70
	1.5	44.60
	2.0	84.26
吸附时间 adsorption time	5 min	2.21
	10 min	6.63
	20 min	8.84
	60 min	11.05
	120 min	15.47
	180 min	18.79
	240 min	19.89
	300 min	19.89
	360 min	19.23

温度/℃ temperature	q_e/(mg·g^-1)	lnK	ΔG^Θ/ (kJ·mol^-1)	ΔH^Θ/ (kJ·mol^-1)	ΔS^Θ/ (kJ·mol^-1·K^-1)
20	86.61	2.50	-6.08	-9.01	-0.01
30	84.07	2.37	-5.98
40	82.60	2.19	-5.71
50	80.34	1.97	-5.30

Preparation and Adsorption of Fe³⁺ Using Sulfamic Acid Modified Sodium Alginate

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Preparation and Adsorption of Fe³⁺ Using Sulfamic Acid Modified Sodium Alginate