纳米零价铁的制备及其去除水中对氯硝基苯的研究
Preparation of nanoscale zero-valent iron particles and its application in p-nitrochlorobenzene degradation in wastewater
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摘要: 通过FeSO4与KBH4反应，利用液相还原法制备纳米零价铁颗粒(NZVI)，用XRD、SEM和BET对其性能进行表征。在常温常压下利用纳米铁还原废水中的对氯硝基苯(p-CNB)，探讨了反应条件对还原率的影响。结果表明，制备过程中碱性物质(NaOH)的添加可以明显减小颗粒粒径，增大比表面积，提高纳米铁还原反应的效率。NZVI对于对氯硝基苯有很好的去除效果，NZVI用量、p-CNB初始浓度和pH值均对其去除效率产生影响。在纳米铁投加量为1 g/L，pH=2的条件下，添加NaOH的纳米铁能在120 min内将质量浓度为50 mg/L的对氯硝基苯基本完全降解，降解率为98.8%。此外，还对NZVI还原对氯硝基苯的机理进行了初步探讨。Abstract: Nanoscale zero-valent iron(NZVI)was prepared with a method of reduction in liquid phase by the reaction of FeSO4 and KBH4,and characterized by XRD, SEM and BET. The reduction of p-CNB at ambient temperature and pressure and the effects of system parameters were investigated. The results indicated that the adding of NaOH in preparation could decrease the particle size, increase the specific surface area and improve the efficiency of reduction obviously.NZVI possessed good removal effect of p-CNB, the quality of NZVI, the initial concentration of p-CNB and pH all had impacts on the reduction. Under pH 2, after 120 mins of reaction, the efficiency can reach 98.8% when the quality of NZVI which contains NaOH is 1.0 g/L and the initial concentration of p-CNB is 50 mg/L. In addition, preliminary mechanisms of the reduction were discussed briefly.
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Key words:
- nanoscale zerovalent iron /
- p-nitrochlorobenzene /
- alkaline substance /
- reduction
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