张彬彬¹,
王向宇¹
1.昆明理工大学环境科学与工程学院，昆明 650500
基金项目: 国家自然科学基金资助项目 (51368025)

Immobization of nanozero-valent iron with citric acid modified walnut shell powder and EDTA optimization for tetracycline removal

ZHANG Binbin¹,
WANG Xiangyu¹
1.School of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China

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摘要:为解决纳米零价铁（NZVI）因团聚而导致的反应活性降低问题，通过液相还原法合成新型柠檬酸改性核桃壳粉负载纳米零价铁（CA-WNS-NZVI）的复合材料，添加EDTA条件下对四环素（TC）进行去除研究。柠檬酸改性可以增加核桃壳粉表面的羧基基团，有助于提高NZVI的负载量和分散性；在反应体系中存在EDTA的情况下，CA-WNS-NZVI对TC去除率达到99.02%，而在无EDTA条件下，TC去除率仅为82.10%。系统地研究了TC初始浓度、pH、温度和EDTA浓度对TC去除效果的影响。CA-WNS-NZVI的SEM表征揭示了NZVI均匀地分布在CA-WNS-NZVI上。CA-WNS-NZVI复合材料的XRD和FT-IR谱图表明NZVI成功地负载在核桃壳表面。同时讨论了EDTA优化CA-WNS-NZVI复合材料对TC去除的反应机制。新型CA-WNS-NZVI复合材料有望为抗生素废水治理提供新思路和新技术方法。
关键词: 纳米零价铁/
柠檬酸/
EDTA/
核桃壳粉/
四环素

Abstract:In order to solve the problems of the reaction activity reduction caused by aggregation of nanoscale zero-valent iron (NZVI), a novelly-designed composite of citric acid modifying walnut shell powder loaded with NZVI (CA-WNS-NZVI) was developed through liquid phase reducing method, it was used to remove tetracycline(TC) in the presence of EDTA. The modification of walnut shell powder with citric acid can increase the carboxyl content, which was beneficial to NZVI loading content and dispersity. The results show that the TC removal rate could reach 99.02% by CA-WNS-NZVI in the presence of EDTA, while reach 82.10% in the absence of EDTA. Batch experiments were conducted to systematically study the effects of TC initial concentration, pH value, temperature and EDTA concentration on TC removal efficiency. The SEM analysis reveals that NZVI was uniformly dispersed on CA-WNS-NZVI surface. XRD patterns and FT-IR spectra of CA-WNS-NZVI demonstrate that NZVI was successfully loaded on the surface of walnut shell powder. The reaction mechanism for TC removal was studied with CA-WNS-NZVI composites under EDTA optimization. Overall, our results indicated that CA-WNS-NZVI might be a promising functional material for TC wastewater remediation.
Key words:nano zero-valent iron/
citric acid/
EDTA/
walnut shell powder/
tetracycline.

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刊出日期:2018-11-29

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柠檬酸改性核桃壳粉负载纳米零价铁的制备及EDTA优化去除四环素

张彬彬¹,
王向宇¹
1.昆明理工大学环境科学与工程学院，昆明 650500
基金项目: 国家自然科学基金资助项目 (51368025)
关键词: 纳米零价铁/
柠檬酸/
EDTA/
核桃壳粉/
四环素
摘要:为解决纳米零价铁（NZVI）因团聚而导致的反应活性降低问题，通过液相还原法合成新型柠檬酸改性核桃壳粉负载纳米零价铁（CA-WNS-NZVI）的复合材料，添加EDTA条件下对四环素（TC）进行去除研究。柠檬酸改性可以增加核桃壳粉表面的羧基基团，有助于提高NZVI的负载量和分散性；在反应体系中存在EDTA的情况下，CA-WNS-NZVI对TC去除率达到99.02%，而在无EDTA条件下，TC去除率仅为82.10%。系统地研究了TC初始浓度、pH、温度和EDTA浓度对TC去除效果的影响。CA-WNS-NZVI的SEM表征揭示了NZVI均匀地分布在CA-WNS-NZVI上。CA-WNS-NZVI复合材料的XRD和FT-IR谱图表明NZVI成功地负载在核桃壳表面。同时讨论了EDTA优化CA-WNS-NZVI复合材料对TC去除的反应机制。新型CA-WNS-NZVI复合材料有望为抗生素废水治理提供新思路和新技术方法。

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