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.

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.

Removal of Ni(II) from aqueous solutions by sulfide-modified nanoscale zero-valent iron supported by hydroxyapatite(HAP/S-nZVI)

2021 ◽  
Vol 232 ◽  
pp. 149-164
Author(s):  
Hui Xu ◽  
Minzhang Chen ◽  
Yajuan Zhang ◽  
Pengdong Chen ◽  
Yong Chen
Keyword(s):  
Aqueous Solutions ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron

scholarly journals Removal of Hexavalent Chromium Ions from Aqueous Solutions by an Anion-Exchange Resin

2008 ◽  
Vol 26 (9) ◽  
pp. 693-703 ◽  
Author(s):  
P. Senthil Kumar ◽  
K. Kirthika ◽  
K. Sathish Kumar
Keyword(s):  
Aqueous Solutions ◽  
Anion Exchange ◽  
Hexavalent Chromium ◽  
Exchange Resin ◽  
Ph Value ◽  
Anion Exchange Resin ◽  
Freundlich Isotherm ◽  
Sorption Process ◽  
Isotherm Models ◽  
Exchange Resins

The removal of hexavalent chromium, Cr(VI), from aqueous solutions under different conditions using an anion-exchange resin (AXR) as an adsorbent was investigated under batch conditions. Such studies indicated that the percentage adsorption decreased with increasing initial Cr(VI) concentration, with the maximum removal of such ions occurred at a pH value of ca. 2.0. Both the Langmuir and Freundlich isotherm models were capable of reproducing the isotherms obtained experimentally. The sorption process was rapid during the first 20 min with equilibrium being attained within 30 min. The process followed first-order kinetics. The results demonstrate that such anion-exchange resins can be used for the efficient removal of Cr(VI) ions from water and wastewater.

scholarly journals Effect of Kaolin particle size on the removal of Pb(II) from aqueous solutions by Kaolin-supported nanoscale zero-valent iron

2020 ◽  
Vol 7 (4) ◽  
pp. 045002
Author(s):  
Shang-Qun Li ◽  
Chuang Yu ◽  
Ze-Xiang Wu ◽  
Xiao-Qing Cai ◽  
Fu-Sheng Zha
Keyword(s):  
Particle Size ◽  
Aqueous Solutions ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron

scholarly journals Highly efficient and rapid removal of arsenic(iii) from aqueous solutions by nanoscale zero-valent iron supported on a zirconium 1,4-dicarboxybenzene metal–organic framework (UiO-66 MOF)

RSC Advances ◽  
2019 ◽  
Vol 9 (67) ◽  
pp. 39475-39487 ◽  
Author(s):  
Tingyi Liu ◽  
Zhengchao Zhang ◽  
Zhaohui Wang ◽  
Zhong-Liang Wang ◽  
Richard Bush
Keyword(s):  
Aqueous Solutions ◽  
Metal Organic Framework ◽  
Zero Valent Iron ◽  
Highly Efficient ◽  
Nanoscale Zero Valent Iron ◽  
Metal Organic ◽  
Rapid Removal ◽  
Removal Of Arsenic ◽  
Organic Framework

A zirconium 1,4-dicarboxybenzene metal–organic framework (UiO-66 MOF) was successfully used as a template to enhance the distribution and activity of nanoscale zero-valent iron (NZVI).

Chemical pathways of Nanoscale Zero-Valent Iron (NZVI) during its transformation in aqueous solutions

2018 ◽  
Vol 6 (5) ◽  
pp. 6207-6220 ◽  
Author(s):  
Osama Eljamal ◽  
Relebohile Mokete ◽  
Nobuhiro Matsunaga ◽  
Yuji Sugihara
Keyword(s):  
Aqueous Solutions ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron

Toxicity of sulfide-modified nanoscale zero-valent iron to Escherichia coli in aqueous solutions

Chemosphere ◽  
2019 ◽  
Vol 220 ◽  
pp. 523-530 ◽  
Author(s):  
Yujun Cheng ◽  
Haoran Dong ◽  
Yue Lu ◽  
Kunjie Hou ◽  
Yaoyao Wang ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Aqueous Solutions ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron
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