Hexavalent chromium removal by a new composite system of dissimilatory iron reduction bacteria Aeromonas hydrophila and nanoscale zero-valent iron

2019 ◽  
Vol 362 ◽  
pp. 63-70 ◽  
Author(s):  
Zunji Shi ◽  
Wenjuan Shen ◽  
Kai Yang ◽  
Ningning Zheng ◽  
Xiaofang Jiang ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Aeromonas Hydrophila ◽  
Iron Reduction ◽  
Composite System ◽  
Zero Valent Iron ◽  
Chromium Removal ◽  
Nanoscale Zero Valent Iron ◽  
Dissimilatory Iron Reduction

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 High dispersions of nano zero valent iron supported on biochar by one-step carbothermal synthesis and its application in chromate removal

RSC Advances ◽  
2019 ◽  
Vol 9 (22) ◽  
pp. 12428-12435 ◽  
Author(s):  
Shifeng Li ◽  
Tingting You ◽  
Yang Guo ◽  
Shuhua Yao ◽  
Shuyan Zang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hexavalent Chromium ◽  
Zero Valent Iron ◽  
Synthesis And Characterization ◽  
Carbothermal Synthesis ◽  
Nanoscale Zero Valent Iron ◽  
Nano Zero Valent Iron ◽  
One Step

A one-step carbothermal synthesis and characterization of biochar-supported nanoscale zero-valent iron (nZVI/BC) was performed for the removal of hexavalent chromium (Cr(vi)) from aqueous solution.

scholarly journals Nanoscale Zero-Valent Iron and Chitosan Functionalized Eichhornia crassipes Biochar for Efficient Hexavalent Chromium Removal

2019 ◽  
Vol 16 (17) ◽  
pp. 3046 ◽  
Author(s):  
Xue-Li Chen ◽  
Feng Li ◽  
Xiao Jie Xie ◽  
Zhi Li ◽  
Long Chen
Keyword(s):  
Aqueous Solutions ◽  
Sorption Capacity ◽  
Hexavalent Chromium ◽  
Electrostatic Interactions ◽  
Eichhornia Crassipes ◽  
Ph Value ◽  
Zero Valent Iron ◽  
River Channels ◽  
Environmental Treatment ◽  
Nanoscale Zero Valent Iron

Sorption is widely used for the removal of toxic heavy metals such as hexavalent chromium (Cr(VI)) from aqueous solutions. Green sorbents prepared from biomass are attractive, because they leverage the value of waste biomass and reduce the overall cost of water treatment. In this study, we fabricated biochar (BC) adsorbent from the biomass of water hyacinth (Eichhornia crassipes), an invasive species in many river channels. Pristine BC was further modified with nanoscale zero-valent iron (nZVI) and stabilized with chitosan (C) to form C–nZVI–BC. C–nZVI–BC adsorbent showed high hexavalent chromium sorption capacity (82.2 mg/g) at pH 2 and removed 97.34% of 50 mg/L Cr(VI) from aqueous solutions. The sorption capacity of chitosan–nZVI-modified biochar decreased while increasing the solution pH value and ionic strength. The results of a sorption test indicated that multiple mechanisms accounted for Cr(VI) removal by C–nZVI–BC, including complexation, precipitation, electrostatic interactions, and reduction. Our study suggests a way of adding value to biomass waste by considering environmental treatment purposes.

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