Ultrasound enhanced degradation of decabromodiphenyl ether by montmorillonite supported Ni-Fe nanoparticles

doi:10.16085/j.issn.1000-6613.2017-0687

Abstract

Abstract: In order to resolve the problem of traditional nanoscale zero valent iron (nZVI)in the degradation of pollutants, which include easily oxidization, accumulation and low reactivity, montmorillonite supported nanoscale Ni-Fe (Ni-Fe/mont)etc. were prepared and characterized. Influencing factors in the degradation of decabromodiphenyl ether (BDE-209) were investigated, which include the concentration of BDE-209 or nZVI, temperature, initial pH of solution, and ultrasounic assistance. The BDE-209 degradation efficiencies of nZVI and modified nZVI were compared. The reaction mechanisms were discussed and reaction kinetic equations were calculated. Results showed that the optimum conditions were 5.0mg/L BDE-209, 2.0g/L catalyst, temperature=35℃ and pH=3. The degradation of BDE-209 was completed within 10min for the ultrasounic treatment, and its observed rate constant (k_obs, 0.519min^-1)was 40 times faster than the shaking treatment (0.013min^-1), and 130 times faster than the static treatment (0.004min^-1). At 10min, the BDE-209 degradation rate was followed the order of Ni-Fe/mont (99.5%) > nZVI/mont (85.1%) > nanoscale Ni-Fe (64.8%) > nZVI (48.1%)>mont (4.1%) > nanoscale Ni (1.1%). At 120min, the k_obs was followed the order of Ni-Fe/mont (0.519min^-1) > nZVI/mont (0.209min^-1) > nanoscale Ni-Fe (0.050min^-1) > nZVI (0.024min^-1). No significant degradation of BDE-209 was found for montmorillonite, nanoscale nickel, or ultrasound in itself.

Key words: nanoparticles, zero valent iron (ZVI), reduction, degradation, decabromodiphenyl ether (BDE-209)

摘要： 为解决传统纳米零价铁（nZVI）降解污染物时易氧化团聚、反应活性低的问题，通过改性手段制备并表征了蒙脱石搭载纳米Ni-Fe（Ni-Fe/蒙脱石）等复合材料，考察污染物和纳米材料质量浓度、温度、溶液初始pH、超声辅助等对其降解十溴二苯醚（BDE-209）的影响，比较nZVI改性前后的降解效果，分析其机理并建立了反应动力学方程。结果表明：最佳反应条件为5mg/L的BDE-209、2g/L的nZVI、温度35℃、pH=3。超声处理10min时BDE-209基本降解完，其表观速率常数（k_obs，0.519min^-1）是震荡处理（0.013min^-1）的40倍、静置处理（0.004min^-1）的130倍。几种材料在10min时对BDE-209的降解率为：Ni-Fe/蒙脱石（99.5%） > nZVI/蒙脱石（85.1%） > 纳米Ni-Fe（64.8%） > nZVI（48.1%） > 蒙脱石（4.1%） > 纳米Ni（1.1%），120min时k_obs为：Ni-Fe/蒙脱石（0.519min^-1） > nZVI/蒙脱石（0.209min^-1） > 纳米Ni-Fe（0.050min^-1） > nZVI（0.024min^-1）。蒙脱石、纳米Ni及超声本身基本不降解BDE-209。

关键词: 纳米粒子, 零价铁, 还原, 降解, 十溴二苯醚

CLC Number:

X505

HAN Wenliang, CHEN Haiming. Ultrasound enhanced degradation of decabromodiphenyl ether by montmorillonite supported Ni-Fe nanoparticles[J]. Chemical Industry and Engineering Progress, 2018, 37(01): 350-358.

韩文亮, 陈海明. 蒙脱石搭载纳米Ni-Fe超声降解十溴二苯醚[J]. 化工进展, 2018, 37(01): 350-358.

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