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金属矿山 ›› 2023, Vol. 52 ›› Issue (11): 74-80.

• “矿物材料基础理论与应用技术”专题 • 上一篇    下一篇

碱浸改性蛇纹石尾渣吸附材料的制备及其对 Cu2+的吸附性能研究

刘文宝1,2 丁 睿2 刘文刚2 李维超2 张 覃1 沈岩柏2 刘睿哲2   

  1. 1. 贵州科学院,贵州 贵阳 550001;2. 东北大学资源与土木工程学院,辽宁 沈阳 110819
  • 出版日期:2023-11-15 发布日期:2024-01-02
  • 基金资助:
    中国博士后科学基金项目(编号:2022M720927);贵州省省级科技计划项目(编号:黔科合支撑[2023]一般 142)

Preparation of Alkali Leaching Modified Serpentine Tailings Adsorption Material and Its Adsorption Performance for Copper Ions

LIU Wenbao1,2 DING Rui2 LIU Wengang2 LI Weichao2 ZHANG Qin1 SHEN Yanbai2 LIU Ruizhe2 #br#   

  1. 1. Guizhou Academy of Sciences,Guiyang 550001,China;2. School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China
  • Online:2023-11-15 Published:2024-01-02

摘要: 为提升蛇纹石尾渣(ALS)对重金属污染物 Cu2+的去除效果,实现废水中 Cu2+的高效去除,开展了蛇纹石 尾渣碱浸改性研究,系统探究改性后蛇纹石尾渣吸附材料(AALS)对废水中 Cu2+去除性能的影响。 结果表明,当蛇纹 石尾渣与氢氧化钠质量比为 1 ∶0. 12、改性温度为 30. 0 ℃ 、改性时间为 90. 0 min 时,改性效果最佳。 利用 BET、SEM、 XRD 和 FTIR 等分析方法考察了碱浸改性蛇纹石尾渣的改性机理。 结果表明,碱浸改性致使蛇纹石尾渣的比表面积 从 22. 62 m2 / g 提高到 67. 19 m2 / g,碱可以侵蚀蛇纹石浸渣的结构,导致其暴露出更多 Si—O—Si、Si—O 官能团,增加 了颗粒表面的 Cu2+吸附位点。 AALS 对溶液中 Cu2+的最佳吸附条件为 AALS 用量为 0. 15 g、吸附时间为 15 min、溶液 pH 值为 5. 39,此时其对 50. 0 mL 浓度为 125. 0 mg / L Cu2+溶液中 Cu2+的吸附量及 Cu2+去除率分别为 40. 68 mg / g 和 95. 27%。 吸附动力学拟合结果表明,AALS 对溶液中 Cu2+的吸附更符合准二级动力学模型,由此可知 Cu2+在 AALS 表 面以化学吸附为主。 解吸试验表明,盐酸不仅能够实现 AALS 的再生,且在多次解吸再生后,AALS 对溶液中的 Cu2+仍 具有较高的吸附率。 研究结果可为蛇纹石尾渣改性材料的制备和溶液中重金属 Cu2+的吸附处理提供借鉴和指导。

关键词: 蛇纹石浸渣, 碱浸改性, Cu2+, 吸附动力学

Abstract: In order to improve the removal efficiency of Cu2+ from serpentine leaching tailings (ALS) and realize the efficient removal of Cu2+ from wastewater,the study modified serpentine leaching tailings by alkali leaching,and explored the influence of modified serpentine leaching tailings (AALS) on Cu2+ removal performance in wastewater. The results showed that the optimum modification effect was obtained when the mass ratio of serpentine leaching tailings to sodium hydroxide was 1 ∶0. 12, the modification temperature was 30. 0℃ and the modification time was 90. 0 min. The mechanism of alkali modified serpentine leaching tailings was studied by means of BET,SEM,XRD and FTIR. The results showed that the specific surface area of serpentine leaching tailings was increased from 22. 62 m2 / g to 67. 19 m2 / g by alkali modification,and the structure of serpentine leaching tailings was eroded by alkali,which resulted in the exposure of more Si—O—Si and Si—O functional groups and enhanced the adsorption sites of Cu2+ on the particle surface. The optimum adsorption conditions of AALS for Cu2+ in solution are as follows:the amount of AALS is 0. 15 g,the adsorption time is 15. 0 min,the pH value of the solution is 5. 39,the adsorption capacity and the removal rate of Cu2+ in 50. 0 mL of 125. 0 mg / L Cu2+ solution are 40. 68 mg / g and 95. 27%,respectively. The adsorption kinetics fitting results show that the adsorption of Cu2+ on AALS is more suitable to be simulated by a quasi-secondorder kinetic model,which shows that Cu2+ is mainly chemisorbed on AALS surface. The desorption test shows that hydrochloric acid can not only regenerate the AALS,but also has a high adsorption rate for copper ions in the solution after repeated analytical regeneration. This study provides reference and guidance for the preparation of serpentine tailings modified materials and the adsorption treatment of heavy metal Cu2+ in solution.

Key words: serpentine leaching residue,alkali leaching modification,copper ions,adsorption kinetics