4A分子筛负载Ce和γ-Fe2O3去除水中Sb（Ⅲ）和Sb（Ⅴ）的研究

doi:10.19964/j.issn.1006-4990.2023-0167

Abstract

Abstract:

In order to efficiently remove Sb（Ⅲ） and Sb（V） from water，a new type of Ce and Fe-loaded 4A molecular sieve adsorbent（4A@Ce-Fe） was synthesized by coprecipitation method.Ce and γ-Fe₂O₃ loading significantly improved the adsorption capacity of molecular sieve for antimony.When the Ce∶Fe mass ratio was 1∶3 and pH was 7.0，the maximum adsorption capacity of 4A@Ce-Fe for Sb（Ⅲ） and Sb（V） was 50.50 mg/g and 10.03 mg/g，respectively.The saturation magnetization of 4A@Ce-Fe was 23.70 emu/g，which had good magnetic separation performance and was easy to separate from water.Langmuir isotherms could well fit the adsorption of Sb（Ⅲ） and Sb（V），and Langmuir and Freundlich isotherms could well fit the adsorption data of Sb（V）.The adsorption kinetics study showed that the adsorption of Sb（Ⅲ） and Sb（V） was more in line with the pseudo-second-order kinetic model.The adsorbent had good adsorption effect on antimony at the initial pH=4.0~10.0，and Ce and Fe were hardly dissolved out.Cl^-，SO₄^2- and NO₃^- had little effect on the adsorption of Sb（Ⅲ） and Sb（V），and the presence of HCO₃^- and H₂PO₄^- significantly reduced the adsorption capacity.XRD，SEM，BET，FT-IR，XPS and other test results showed that the possible adsorption mechanisms of Sb（Ⅲ） and Sb（V） on 4A@Ce-Fe included ion exchange，surface complexation and oxidation-reduction reaction.The formation of M—O—Sb complex played a major role in Sb adsorption.

Key words: 4A molecular sieve, cerium loaded, γ-Fe₂O₃ loaded, antimony adsorption

CLC Number:

O647.33

YAN Zhen, QIU Zhaofu, JIN Xibiao, WANG Yuan, LIU Chang, YANG Ji. Study on 4A molecular sieve loaded with Ce and γ-Fe₂O₃ for removal of Sb（Ⅲ） and Sb（Ⅴ） in water[J]. Inorganic Chemicals Industry, 2024, 56(1): 81-89.

Figures/Tables 17

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铈铁质量比	w （Al₂O₃）/%	w （SiO₂）/%	w （Na₂O）/%	w （CeO₂）/%	w （Fe₂O₃）/%
1∶0	26.73	29.65	15.00	14.60	0
2∶1	23.54	26.53	10.57	17.24	6.26
3∶2	24.37	26.70	11.98	14.53	9.18
1∶1	22.81	25.66	11.33	12.69	11.28
1∶2	21.69	23.71	11.27	10.87	22.09
1∶3	19.38	20.75	9.87	9.46	31.02
0∶1	22.46	23.81	12.92	0	38.11

样品	温度/℃	Q_e，exp/（mg·g^-1）	准一级动力学模型			准二级动力学模型
样品	温度/℃	Q_e，exp/（mg·g^-1）	k₁/min^-1	Q_e，cal/（mg·g^-1）	R₁²	k₂/（g·mg^-1·min^-1）	Q_e，cal/（mg·g^-1）	R₂²
Sb（Ⅲ）	25	40.68	0.225	37.77	0.909 2	9.15×10^-3	39.46	0.987 6
Sb（Ⅴ）	25	7.72	0.293	7.21	0.873 9	3.46×10^-2	7.59	0.971 0

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Inorganic Acid-Base-Salt Committee of CIESC

Study on 4A molecular sieve loaded with Ce and γ-Fe₂O₃ for removal of Sb（Ⅲ） and Sb（Ⅴ） in water

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吸附剂	磁性	Sb种类	pH	Q_m/（mg·g^-1）
Fe₂O₃改性碳纳米管^［19］	无	Sb（Ⅲ）	7.0	5.37
FeO（OH）负载沸石^［20］	无	Sb（Ⅲ）	2.7	7.17
铈改性Y型分子筛^［12］	无	Sb（Ⅲ）	7.0	24.65
铈改性Y型分子筛^［12］	无	Sb（Ⅴ）	7.0	7.28
赤铁矿改性磁性纳米颗粒^［21］	有	Sb（Ⅲ）	4.1	36.7
Fe₃O₄/HCO^［22］	有	Sb（Ⅲ）	7.0	22.85
Fe₃O₄负载沸石^［23］	有	Sb（Ⅴ）	7.0	19
4A@Ce-Fe	有	Sb（Ⅲ）	7.0	50.50
4A@Ce-Fe	有	Sb（Ⅴ）	7.0	10.03