Study on adsorption of heavy metals Co2+ and Ni2+ in manganese ore leachate by δ-MnO2

doi:10.19965/j.cnki.iwt.2022-0162

Abstract

Abstract:

Along with the rapid industrialization， the environmental problems caused by heavy metal ions are becoming more and more prominent， and it is of great significance to solve the environmental pollution of heavy metal from the source. The adsorption study of δ-MnO₂was carried out for the problem of difficult removal of heavy metals Co²⁺ and Ni²⁺ from manganese ore leachate. δ-MnO₂ was characterized by XRD， SEM， FT-IR and BET methods. The effects of process conditions on the adsorption of Co²⁺ and Ni²⁺ in manganese ore leach solution by δ-MnO₂ were investigated. The adsorption mechanism of δ-MnO₂was further analyzed based on the characterization results. The results showed that δ-MnO₂was less crystalline and more porous， with a large number of hydroxyl structures on its surface， and it had more pore structures with larger average pore size， and thus had the potential for excellent adsorption performance. The solution pH had a great influence on the adsorption reaction， with the adsorption rate increasing with the increase of solution pH. As the reaction time increased， the adsorption rate increases and then decreases. The adsorption rate increased with the increase of reaction temperature. The optimum adsorption conditions were as follows： reaction temperature 80 ℃， reaction time 60 min， pH 7. The adsorption rates of Co²⁺and Ni²⁺were 96.10% and 87.25% respectively. The analysis of characterization results showed that the adsorption of Co²⁺and Ni²⁺in the leachate of manganese ore by δ-MnO₂was mainly affected by surface hydroxyl groups. δ-MnO₂ had good adsorption effect on heavy metal Co²⁺ and Ni²⁺ in manganese ore leachate， which could reduce the secondary pollution of heavy metal ions in manganese ore leachate and provide a certain research basis for solving the hazard of heavy metal ions at source.

Key words: δ-MnO₂, adsorption, manganese ore leachate, heavy metal

摘要：

随着工业化程度的加快，由重金属离子引起的环境问题日益突出，从源头上解决重金属环境污染问题意义重大。针对锰矿浸出液中重金属Co²⁺、Ni²⁺难以去除的问题进行δ-MnO₂吸附研究，利用XRD、SEM、FT-IR和BET方法对δ-MnO₂进行表征，研究了工艺条件对δ-MnO₂吸附锰矿浸出液中Co²⁺、Ni²⁺的影响，根据表征结果进一步分析δ-MnO₂的吸附行为机理。结果表明：结晶性较差、孔隙较多的δ-MnO₂表面存在大量羟基结构，且孔隙结构较多，平均孔径较大，具有优异吸附性能的潜力。溶液pH对该吸附反应影响较大，吸附率随着溶液pH的升高而增加；随着反应时间的增加，吸附率先增加后减小；提高反应温度后吸附率提高。最佳吸附条件：反应温度80 ℃、反应时间60 min、pH为7，Co²⁺和Ni²⁺的吸附率分别为96.10%、87.25%。由表征结果分析可知δ-MnO₂吸附锰矿浸出液中的Co²⁺、Ni²⁺主要受表面羟基的作用。δ-MnO₂对锰矿浸出液中重金属Co²⁺、Ni²⁺具有良好的吸附效果，可减少锰矿浸出液中重金属离子的二次污染，为源头上解决重金属离子的危害提供一定研究基础。

关键词: δ-MnO₂, 吸附, 锰矿浸出液, 重金属

CLC Number:

X703.1

Yongzhen JIA,Mingdong LI,Song WANG,Haifeng WANG,Jiawei WANG,Hao YUAN. Study on adsorption of heavy metals Co²⁺ and Ni²⁺ in manganese ore leachate by δ-MnO₂[J]. Industrial Water Treatment, 2022, 42(12): 85-90.

贾永真,李明东,王松,王海峰,王家伟,袁浩. δ-MnO₂吸附锰矿浸出液中重金属Co²⁺、Ni²⁺的研究[J]. 工业水处理, 2022, 42(12): 85-90.

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URL: https://gyscl.magtechjournal.com/EN/10.19965/j.cnki.iwt.2022-0162

https://gyscl.magtechjournal.com/EN/Y2022/V42/I12/85

Figures/Tables 9

Fig. 1 XRD of δ-MnO₂

Fig. 2 SEM images of δ-MnO₂

Fig. 3 Nitrogen adsorption-desorption curve and pore size distribution of δ-MnO₂

Table 1 Adsorption rates of δ-MnO₂ on Co²⁺ and Ni²⁺ at different pH

pH	1	2	3	4	5	6	7	8
Ni²⁺吸附率/%	16.57	17.42	19.85	21.27	23.82	61.60	68.17	80.42
Co²⁺吸附率/%	28.55	34.87	38.05	42.60	50.65	78.50	86.65	95.52

Table 2 Adsorption rates of δ-MnO₂ on Co²⁺ and Ni²⁺ at different reaction time

反应时间/min	5	10	20	30	60	90	150
Ni²⁺吸附率/%	22.62	44.1	59.25	68.17	78.82	75.97	74.82
Co²⁺吸附率/%	54.15	67.95	81.35	86.65	93.45	87.95	82.22

Table 3 Adsorption rates of δ-MnO₂ on Co²⁺ and Ni²⁺ at different temperatures

温度/℃	20	35	50	65	80	95
Ni²⁺吸附率/%	62.65	68.37	74.37	80.20	86.75	87.25
Co²⁺吸附率/%	72.57	77.55	80.87	91.77	95.72	96.10

Fig. 4 XRD patterns of δ-MnO₂ after adsorption

Fig. 5 FT-IR spectra of δ-MnO₂ before and after adsorption

Fig. 6 XPS spectra of δ-MnO₂ before and after adsorption

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Study on adsorption of heavy metals Co²⁺ and Ni²⁺ in manganese ore leachate by δ-MnO₂

δ-MnO₂吸附锰矿浸出液中重金属Co²⁺、Ni²⁺的研究

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