Remediation of 1,2-dichlorobenzene contaminated soil by activated persulfate using green synthesized nanoscale zero valent iron: activation mechanism and degradation pathways

2022 ◽  
Author(s):  
Jingchun Yan ◽  
Linchao Hu ◽  
Weiguo Gao ◽  
Lei Yang ◽  
Linbo Qian ◽  
...  
Keyword(s):  
Contaminated Soil ◽  
Zero Valent Iron ◽  
Activation Mechanism ◽  
Degradation Pathways ◽  
Nanoscale Zero Valent Iron ◽  
Activated Persulfate

scholarly journals Application of nanoscale zero-valent iron in hexavalent chromium-contaminated soil: A review

2020 ◽  
Vol 9 (1) ◽  
pp. 736-750
Author(s):  
Xilu Chen ◽  
Xiaomin Li ◽  
Dandan Xu ◽  
Weichun Yang ◽  
Shaoyuan Bai
Keyword(s):  
Heavy Metal ◽  
Hexavalent Chromium ◽  
Contaminated Soil ◽  
Zero Valent Iron ◽  
Toxic Heavy Metal ◽  
Factors Affecting ◽  
Metal Pollutants ◽  
Nanoscale Zero Valent Iron ◽  
Low Toxicity ◽  
Heavy Metal Pollutants

AbstractChromium (Cr) is a common toxic heavy metal that is widely used in all kinds of industries, causing a series of environmental problems. Nanoscale zero- valent iron (nZVI) is considered to be an ideal remediation material for contaminated soil, especially for heavy metal pollutants. As a material of low toxicity and good activity, nZVI has been widely applied in the in situ remediation of soil hexavalent chromium (Cr(vi)) with mobility and toxicity in recent years. In this paper, some current technologies for the preparation of nZVI are summarized and the remediation mechanism of Cr(vi)-contaminated soil is proposed. Five classified modified nZVI materials are introduced and their remediation processes in Cr(vi)-contaminated soil are summarized. Key factors affecting the remediation of Cr(vi)-contaminated soil by nZVI are studied. Interaction mechanisms between nZVI-based materials and Cr(vi) are explored. This study provides a comprehensive review of the nZVI materials for the remediation of Cr(vi)-contaminated soil, which is conducive to reducing soil pollution.

scholarly journals Persulfate activation by nano zero-valent iron for the degradation of metoprolol in water: influencing factors, degradation pathways and toxicity analysis

RSC Advances ◽  
2020 ◽  
Vol 10 (35) ◽  
pp. 20991-20999
Author(s):  
Yu-qiong Gao ◽  
Jia Zhang ◽  
Jin-qiang Zhou ◽  
Cong Li ◽  
Nai-yun Gao ◽  
...  
Keyword(s):  
Influencing Factors ◽  
Zero Valent Iron ◽  
Degradation Pathways ◽  
Toxicity Analysis ◽  
Nano Zero Valent Iron ◽  
Persulfate Activation ◽  
Activated Persulfate

The influencing factors, mechanism and toxicity of MTP degradation by nZVI activated persulfate were investigated.

scholarly journals Degradation of Trichloroethylene Contaminated Soil by Zero-Valent Iron Nanoparticles

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Amira Kamal Ibrahem ◽  
Thanaa Abdel Moghny ◽  
Yasser Mohamed Mustafa ◽  
Nermine Elsyed Maysour ◽  
Farida Mohamed Saad El Din El Dars ◽  
...  
Keyword(s):  
Rate Constant ◽  
Contaminated Soil ◽  
Chlorinated Solvents ◽  
Chloride Ion ◽  
Zero Valent Iron ◽  
Specific Rate ◽  
Iron Nanoparticle ◽  
Nanoscale Zero Valent Iron ◽  
Tce Degradation ◽  
Zero Valent Iron Nanoparticles

Trichloroethylene (TCE) contaminated soil has received extensive attention in the environmental issues. Nanoscale zero-valent iron (NZVI) is considered as an excellent reduction catalyst due to fast degradation of chlorinated solvents. Therefore, this paper aims to evaluate TCE removal from soil by surfactant modified nanoscale zero-valent iron (SNZVI). In this respect, fixed 500 g soil having a diameter range 0.5–1 mm was polluted with 10 mL TCE and put inside glass column of 2.5 cm diameter × 300 cm length. The NZVI solution was prepared from reduction of FeCL3 by NaBH4 and coating with 2.5 g nonionic surfactant (Tween 85) to produce iron nanoparticle concentration of 0.1 g/L. The prepared iron nanoparticle was poured into contaminated soil and left to stir at a constant rate for 24 days. The reductive dechlorination of TCE was measured as a function of increasing chloride ion. It was found that the TCE dechlorination in the presence of iron surfaces displayed pseudo first-order kinetics. The TCE degradation rate constant () is . Also, about 30% of TCE was removed within initial 6 days. The obtained specific rate constant () was and is lower than other studies carried into aqueous phase by about 23 orders of magnitude. Finally, the SNZVI was found to be effective and fully removed to TCE within 456 hours.

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