scholarly journals Extensive removal of thallium by graphene oxide functionalized with aza-crown ether

RSC Advances ◽  
2020 ◽  
Vol 10 (72) ◽  
pp. 44470-44480
Author(s):  
Shu-Xin Pan ◽  
Ting-Zheng Xie ◽  
Tang-Fu Xiao ◽  
Jie-Hui Xie
Keyword(s):  
Heavy Metal ◽  
Graphene Oxide ◽  
Crown Ether ◽  
Aquatic Environments ◽  
Toxic Heavy Metal ◽  
Aza Crown Ether

Thallium (Tl) is a highly toxic heavy metal, and its pollution and remediation in aquatic environments has attracted considerable attention.

scholarly journals Laminated graphene oxide membrane for recovery of mercury-containing wastewater by pervaporation

2021 ◽  
Vol 11 (7) ◽  
Author(s):  
Ziheng Wang ◽  
Yingzhe Qin ◽  
Xiangping Xu ◽  
Jiawei Sun ◽  
Jiancheng Shen ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Graphene Oxide ◽  
Organic Carbon ◽  
High Flux ◽  
Toxic Heavy Metal ◽  
Metal Contaminant ◽  
Oxide Membrane ◽  
High Rejection ◽  
Harmful Effects ◽  
Feed Temperature

AbstractMercury (Hg) is a toxic heavy metal contaminant and has very harmful effects for human health. In this work, Hg-containing wastewater with Hg concentration of 6.36 ppb and 9.4 ppb were recovered with polyethylenimine (PEI) cross-linked graphene oxide (GO) layered membrane (c-GO-PEI) by pervaporation. The influence of ionic type, the concentration of Hg and the feed temperature were investigated. The c-GO-PEI exhibited not only high rejection for salts (> 99.97%), Hg (77.5–100%) and non-purgeable organic carbon (NPOC) (67.3–90.8%) but also high flux (30.30 kg·m−2·h−1) to treat with the wastewater. In addition, the flux could be largely recovered after simple washing, indicating the excellent antifouling property of the membrane.

Aza-crown-ether functionalized graphene oxide for gas sensing and cation trapping applications

2019 ◽  
Vol 6 (7) ◽  
pp. 075603 ◽  
Author(s):  
M Valt ◽  
B Fabbri ◽  
A Gaiardo ◽  
S Gherardi ◽  
D Casotti ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Crown Ether ◽  
Gas Sensing ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Aza Crown Ether

ASSESSMENT OF HEAVY METAL CONCENTRATION IN COCONUT WATER

1970 ◽  
pp. 07-10
Author(s):  
MdDidarul Islam, Ashiqur Rahaman, Aboni Afrose
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Heavy Metal Concentration ◽  
Coconut Water ◽  
Toxic Heavy Metals ◽  
High Concentration ◽  
Toxic Heavy Metal ◽  
Low Concentration ◽  
Wet Ashing ◽  
Aas Method

This study was based on determining concentration of essential and toxic heavy metal in coconut water available at a local Hazaribagh area in Dhaka, Bangladesh. All essential minerals, if present in the drinking water at high concentration or very low concentration, it has negative actions. In this study, fifteen samples and eight heavy metals were analyzed by Atomic Absorption Spectroscopy (AAS) method which was followed by wet ashing digestion method. The concentration obtained in mg/l were in the range of 0.3 to 1.5, 7.77 to 21.2, 0 to 0.71, 0 to 0.9, 0 to 0.2, 0.9 to 17.3, 0.1 to 0.9, 0 to 0.9 and 0 to 0.7 for Fe, Ni, Cu, Cd, Cr, Zn, Pb and Se respectively. From this data it was concluded that any toxic heavy metals like Cd, Cr, Pb and Ni exceed their toxicity level and some essential nutrients were in low concentration in those samples. 

Graphene oxide modified thiosemicarbazide nanocomposite as an effective eliminator for heavy metal ions

2020 ◽  
pp. 114790
Author(s):  
Haya A. Abubshait ◽  
Ahmed A. Farag ◽  
Mohamed A. El-Raouf ◽  
Nabel A. Negm ◽  
Eslam A. Mohamed
Keyword(s):  
Heavy Metal ◽  
Graphene Oxide ◽  
Metal Ions ◽  
Heavy Metal Ions

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.

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