欢迎访问《人工晶体学报》官方网站,今天是 分享到:

人工晶体学报 ›› 2025, Vol. 54 ›› Issue (11): 2015-2028.DOI: 10.16553/j.cnki.issn1000-985x.2025.0102

• 研究论文 • 上一篇    下一篇

镍铝水滑石原位合成及其对Cr(VI)的吸附性能研究

卜瑞颖(), 肖敏(), 田江豪, 杨鑫   

  1. 沈阳大学环境学院,区域污染环境生态修复教育部重点实验室,沈阳 110044
  • 收稿日期:2025-05-11 出版日期:2025-11-20 发布日期:2025-12-11
  • 通信作者: 肖 敏,博士,教授。E-mail:xyz012263@163.com
  • 作者简介:卜瑞颖(2002—),女,甘肃省人,硕士研究生。E-mail:15213905572@163.com
  • 基金资助:
    辽宁省教育厅项目(JYTMS20231159);辽宁省大学生创新创业训练计划项目(S202511035049)

In Situ Synthesis of Nickel-Aluminum Hydrotalcite and Its Adsorption Performance on Cr(VI)

BU Ruiying(), XIAO Min(), TIAN Jianghao, YANG Xin   

  1. Key Laboratory of Ecological Remediation of Regional Contaminated Environment,Ministry of Education,College of Environment,Shenyang University,Shenyang 110044,China
  • Received:2025-05-11 Online:2025-11-20 Published:2025-12-11

摘要: 本文以泡沫镍(NF)为载体,NH4NO3为沉淀剂,采用水热合成法原位制备了层状镍铝水滑石(NiAlNO3-LDH@NF)。结合XRD与SEM表征及宏观吸附实验,探究了晶化时间与温度、Al(NO33浓度、固液比和Al3+/NH4NO3摩尔比对NiAlNO3-LDH@NF晶型结构、形貌与吸附性能的影响,系统考察了NiAlNO3-LDH@NF对Cr(VI)的吸附性能、机理及其再生性能。实验结果表明:在Al3+/NH4NO3摩尔比为2:3,固液比为4.5 mg/mL,Al3+浓度为10 mmol/L条件下,经100 ℃水热处理48 h,在NF载体上成功原位合成了具有良好结晶结构的NiAl-LDH纳米片,其具有高比表面积的层状结构,呈现出由纳米片组成的花朵状微球;在25 ℃、pH=5、投加量为3.4 g/L的条件下,NiAlNO3-LDH@NF对模拟废水中50 mg/L Cr(VI)去除率达80%以上,吸附量为10.05 mg/g,吸附等温线符合Langmuir模型,吸附动力学符合准二级动力学方程,为单分子层吸附,吸附速率受化学吸附机制控制;NiAlNO3-LDH@NF再生5次后,对Cr(VI)去除率仍达80%~85%,表明循环再生性能优异。

关键词: NiAlNO3-LDH; 原位合成; 泡沫镍; 水热合成; 吸附性能; Cr(VI)

Abstract: The hierarchical Ni-Al layered double hydroxides (NiAlNO3-LDH@NF) were fabricated in situ via a hydrothermal synthesis method using nickel foam (NF) as the carrier and NH4NO3 as the precipitant. The crystal structure, morphologies and adsorption performance of NiAlNO3-LDH@NF as a function of crystallization time and temperature, Al(NO33 concentration, solid-liquid ratio and Al3+/NH4NO3 molar ratio were investigated by XRD, SEM characterization and macroscopic adsorption experiments. The adsorption properties, mechanism and regeneration performance of NiAlNO3-LDH@NF on Cr(VI) were examined. The experimental results show that NiAlNO3-LDH@NF with a high specific surface area of layered structure and good crystalline structure were successfully prepared in situ on NF carriers by hydrothermal treatment at 100 ℃ for 48 h under the conditions of Al3+/NH4NO3 molar ratio of 2:3, solid-liquid ratio of 4.5 mg/mL, and Al3+ concentration of 10 mmol/L. The as-prepared NiAlNO3-LDH@NF was constructed from nanosheets with well-defined shapes and sizes, and the nanosheets have a high specific surface area of layered structure, presenting flower like microspheres composed of numerous LDH nanoplatelets. Under the conditions of 25 ℃, pH=5 and NiAlNO3-LDH@NF dosage of 3.4 g/L, more than 80% of 50 mg/L Cr(VI) is removed from simulated wastewater within 240 min, and the adsorption capacity is 10.05 mg/g. The adsorption isotherm conforms to Langmuir model, and the adsorption kinetics follows quasi-second-order kinetic equation, which was the surface monolayer adsorption, and adsorption rate is controlled by chemisorption mechanism. After five times of regeneration of NiAlNO3-LDH@NF, the removal rate of Cr(VI) still reaches 80%~85%, showing its excellent cycle regeneration performance.

Key words: NiAlNO3-LDH; in situ synthesis; Ni foam; hydrothermal synthesis; adsorption performance; Cr(VI)

中图分类号: