研究报告

  • 王健,苏冰琴,权晓慧,常占坤,李瑞.MIL-101(Fe)的优化制备及其对硝酸盐的吸附机制研究[J].环境科学学报,2023,43(2):147-159

  • MIL-101(Fe)的优化制备及其对硝酸盐的吸附机制研究
  • Study on optimization preparation of MIL-101(Fe) and its adsorption mechanisms for nitrate
  • 基金项目:国家自然科学基金(No.22008167);山西省自然科学基金(No.201801D121274)
  • 作者
  • 单位
  • 王健
  • 太原理工大学环境科学与工程学院,晋中 030600;山西省市政工程研究生教育创新中心,晋中 030600
  • 苏冰琴
  • 太原理工大学环境科学与工程学院,晋中 030600;山西省市政工程研究生教育创新中心,晋中 030600
  • 权晓慧
  • 太原理工大学环境科学与工程学院,晋中 030600;山西省市政工程研究生教育创新中心,晋中 030600
  • 常占坤
  • 太原理工大学环境科学与工程学院,晋中 030600;山西省市政工程研究生教育创新中心,晋中 030600
  • 李瑞
  • 太原理工大学环境科学与工程学院,晋中 030600
  • 摘要:采用溶剂热法,制备金属有机骨架(MOFs)材料MIL-101(Fe)吸附去除水中的NO3-,利用Box-Behnken响应面法对MIL-101(Fe)的合成条件进行了优化,设定FeCl3投加量、TPA投加量及合成时间3个影响因素,建立了NO3-吸附量与各因素之间的二次多项式模型,确定了MIL-101(Fe)的最优合成条件,并利用SEM-EDS、FTIR和BET等方法对吸附材料进行了表征.同时,通过静态吸附实验,探究了MIL-101(Fe)投加量、吸附 时间、溶液pH值对材料吸附性能的影响.结果表明,MIL-101(Fe)吸附NO3-的最优条件为:MIL-101(Fe)投加量0.2 g, pH=8.0,温度15 ℃,NO3-初始浓度30 mg?L-1,吸附时间120 min,在此条件下NO3-的吸附量为12.12 mg?g-1,吸附率达80.80%.吸附过程符合拟二级动力学模型、颗粒内扩散模型和Langmuir吸附等温模型.MIL-101(Fe)对NO3-的吸附作用主要体现为以静电作用和Cl-与NO3-之间的离子交换作用为主的化学吸附.
  • Abstract:The solvothermal method was used to prepare MIL-101(Fe), a type of MOFs material, to adsorb NO3- in water. The synthesis conditions of MIL-101(Fe) were optimized using Box-Behnken response surface method. FeCl3 dosage, TPA dosage, and synthesis time were set as the impacting factors. The quadratic polynomial model was constructed to describe the relationship between NO3- adsorption rate and the impacting factors. Subsequently, the optimal synthesis conditions of MIL-101(Fe) were determined. The physicochemical properties of MIL-101(Fe) were characterized by SEM-EDS, FTIR, and BET. The effects of MIL-101(Fe) dosage, adsorption time, and solution pH on NO3- adsorption were investigated. The results showed that the adsorption capacity of MIL-101(Fe) for NO3- was 12.12 mg?g-1 with the removal rate of 80.80% under the optimized conditions at a dosage of 0.2 g, pH=8.0, 15 ℃, an initial NO3- concentration of 30 mg?L-1, and a 120-min adsorption time. The pseudo-second-order kinetic model, Weber-Morris model, and Langmuir isotherm adsorption model better described the adsorption process. The adsorption of NO3- in water by MIL-101(Fe) was mainly via electrostatic interaction and ion exchange between Cl- and NO3-.

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