Research on adsorption properties of vanadium in vanadium-containing waste liquid by diatomite
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摘要: 湿法提钒工艺中会产生大量含钒废水，直接排放会造成环境污染和资源浪费。硅藻土具有比表面积大、孔隙多、密度小、吸附性能及渗透性较强等优点，广泛应用在环境治理领域。以硅藻土为吸附剂，采用静态吸附试验研究吸附时间、污染液初始浓度、pH值和硅藻土投入量对钒的吸附效果；对试验数据进行吸附热力学和动力学拟合，探究了吸附机理及特征。研究表明：硅藻土的主要成分是SiO2，含有少量蒙脱石和绿泥石，硅藻壳体为圆盘状，壳体表面有数量众多的微孔结构。热力学拟合中，硅藻土的吸附过程更符合Freundlich模型，R2为0.9010，属于多分子层吸附和表面吸附；动力学拟合中，准二级动力学模型的相关系数比准一级动力学模型高，R2为0.9954，说明吸附过程以化学吸附为主导。当吸附时间24 h，钒污染液初始浓度1 mg/L，污染液用量50 mL，pH值5，硅藻土投加量2 g时，去除率最优，达到98.21%。硅藻土对污染液中钒的吸附效果较好，可作为吸附剂治理钒污染。Abstract: A large amount of vanadium containing wastewater is produced in the wet process of vanadium extraction, and its direct discharge causes serious environmental pollution and resource waste. Due to the advantages of large specific surface area, many pores, low density, strong adsorption performance and permeability of the diatomite, it has been widely used in environmental management fields. Using diatomite as an adsorbent, the effect of adsorption time, initial concentration of polluted liquid, pH value and diatomite dosage on the vanadium adsorption was conducted by static adsorption experiments. The adsorption thermodynamics fitting and kinetics fitting were researched according to the experimental data, and the adsorption mechanism and characteristics was analyzed. The results show that the main component of diatomite is SiO2, with a small amount of montmorillonite and chlorite. The shape of diatom shell is discoid, the surface of the shell has numerous microporous structures. In the thermodynamic fitting, the adsorption process of diatomite is more in line with the Freundlich model, and the R2 is 0.9010, which belongs to the multi-molecular layer adsorption and surface adsorption. In the kinetic fitting, the correlation coefficient of the quasi-second-order kinetic model is higher than that of the quasi-first-order kinetic model, the R2 is 0.9954, indicating that the adsorption process is dominated by chemisorption. When the adsorption time is 24 h, the initial concentration of contaminated vanadium solution is 1 mg/L, the amount of contaminated solution is 50 mL, the pH is 5, and the dosage of diatomite is 2 g, the removal rate of vanadium can reach 98.21%. Therefore, diatomite has a good adsorption effect on vanadium in vanadium-containing waste liquid, and can be used as an adsorbent to treat vanadium pollution.
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Key words:
- vanadium-containing waste liquid /
- diatomite /
- adsorption /
- vanadium /
- removal rate
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[1] Du Guangchao. Research progress of vandium materials used in non-steel fields[J]. Iron Steel Vanadium Titanium, 2015,36(2):49−56. (杜光超. 钒在非钢铁领域应用的研究进展[J]. 钢铁钒钛, 2015,36(2):49−56. doi: 10.7513/j.issn.1004-7638.2015.02.009 [2] Li Mei, Wang Qiang, Gao Hongwen, et al. Effect of vanadium content on properties of new high strength steel[J]. Iron Steel Vanadium Titanium, 2019,40(6):118−121,142. (李梅, 王强, 高宏文, 等. 钒含量对新型高强钢性能的影响[J]. 钢铁钒钛, 2019,40(6):118−121,142. [3] Peng Kebo, Gao Likun, Rao Bing, et al. Current status of vanadium resources and research progress on vanadium extraction with organic phosphorus extractants[J]. Chinese Journal of Engineering, 2021,43(5):603−611. (彭科波, 高利坤, 饶兵, 等. 钒资源现状及有机磷类萃取剂萃钒的研究进展[J]. 工程科学学报, 2021,43(5):603−611. [4] Du Weitong, Jiang Congxiang, Chen Zhuo, et al. Vanadium extraction by roasting from high chlorine and iron titanium tetrachloride tailings after vanadium removal[J]. Mining and Metallurgical Engineering, 2022,42(2):106−109. (堵伟桐, 姜丛翔, 陈卓, 等. 高氯高铁型四氯化钛除钒尾渣焙烧提钒工艺研究[J]. 矿冶工程, 2022,42(2):106−109. doi: 10.3969/j.issn.0253-6099.2022.02.026 [5] Liu Zishuai, Zhang Yimin, Dai Zilin. Recovery of vanadium from vanadium-bearing wastewater of vanadium-titanium magnetite with solvent extraction by N235[J]. Nonferrous Metals (Extractive Metallurgy), 2019,(11):87−92. (刘子帅, 张一敏, 戴子林, 等. N235萃取法从钒钛磁铁矿沉钒废水中回收钒[J]. 有色金属(冶炼部分), 2019,(11):87−92. [6] Fu F L, Wang Q. Removal of heavy metal ions from wastewaters: A review[J]. Journal of Environmental Management, 2011,92(3):407−418. doi: 10.1016/j.jenvman.2010.11.011 [7] Sun Pengcheng, Huang Zhanbin, Liu Luhan. The application pollution control in soil[J]. Environmental Engineering, 2015,33(7):144−147. (孙朋成, 黄占斌, 刘陆涵. 石棉尾矿渣在土壤重金属及农药污染治理中的应用[J]. 环境工程, 2015,33(7):144−147. doi: 10.13205/j.hjgc.201507032 [8] Yuan Yawei, Li Yong. Research progress of ZSM-5 molecular sieve adsorbents used in pollution control[J]. Inorganic Chemicals Industry, 2019,51(10):18−21. (袁亚伟, 李勇. ZSM-5分子筛吸附剂应用于污染治理的研究进展[J]. 无机盐工业, 2019,51(10):18−21. [9] Kariana Moreno-Sader, Alvaro Garcia-Padilla, Alvaro Realpe, et al. Removal of heavy metal water pollutants(Co2+ and Ni2+ ) using polyacrylamide/sodium montmorillonite (PAM/Na-MMT) nanocomposites[J]. ACS Omega, 2019,4(6):10834−10844. doi: 10.1021/acsomega.9b00981 [10] Ling Yulin, Zhou Jianhong, An Junlin, et al. Fabrication of BiOBr/RGO/diatomite and its photocatalytic degradation performance of formaldehyde gas under visible light[J]. Chinese Journal of Environmental Engineering, 2022,16(5):1558−1568. (令玉林, 周建红, 安俊霖, 等. BiOBr/RGO/硅藻土复合催化剂的制备及其在可见光条件下催化降解甲醛气体[J]. 环境工程学报, 2022,16(5):1558−1568. doi: 10.12030/j.cjee.202107126 [11] 刘阳. 超声波—微波辅助酸浸提纯硅藻土的试验研究[D]. 北京: 中国矿业大学, 2016.Liu Yang. Study on acid leaching purification of diatomite assisted by ultrasonic and microwave[D]. Beijing:China University of Mining and Technology, 2016. -
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