Sulfhydryl-Modified Chitosan Aerogel for the Adsorption of Heavy Metal Ions and Organic Dyes

2020 ◽  
Vol 59 (32) ◽  
pp. 14531-14536
Author(s):  
Jubo Zhang ◽  
Yan Wang ◽  
Daxin Liang ◽  
Zefang Xiao ◽  
Yanjun Xie ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Organic Dyes ◽  
Modified Chitosan

scholarly journals Fluorescent Sensors for the Detection of Heavy Metal Ions in Aqueous Media

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 599 ◽  
Author(s):  
Nerea De Acha ◽  
César Elosúa ◽  
Jesús Corres ◽  
Francisco Arregui
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Organic Dyes ◽  
Aqueous Media ◽  
High Specificity ◽  
Fluorescent Sensors ◽  
Special Focus ◽  
Quality Of Water

Due to the risks that water contamination implies for human health and environmental protection, monitoring the quality of water is a major concern of the present era. Therefore, in recent years several efforts have been dedicated to the development of fast, sensitive, and selective sensors for the detection of heavy metal ions. In particular, fluorescent sensors have gained in popularity due to their interesting features, such as high specificity, sensitivity, and reversibility. Thus, this review is devoted to the recent advances in fluorescent sensors for the monitoring of these contaminants, and special focus is placed on those devices based on fluorescent aptasensors, quantum dots, and organic dyes.

Removal of heavy metal ions using chitosan and modified chitosan: A review

2016 ◽  
Vol 214 ◽  
pp. 175-191 ◽  
Author(s):  
Lei Zhang ◽  
Yuexian Zeng ◽  
Zhengjun Cheng
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Modified Chitosan

scholarly journals Preparation and application of polyethyleneimine-modified corncob magnetic gel for removal of Pb(ii) and Cu(ii) ions from aqueous solution

RSC Advances ◽  
2022 ◽  
Vol 12 (4) ◽  
pp. 1950-1960
Author(s):  
Zhi Chen ◽  
Jun Zeng ◽  
Zhi-Bo Zhang ◽  
Zhi-Jie Zhang ◽  
Shan Ma ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Adsorption Properties ◽  
Cross Linking ◽  
Modified Chitosan

A kind of magnetic gel material was synthesized by cross-linking PEI modified chitosan and corncob biomass with good adsorption properties of heavy metal ions.

Bio-inspired surface-functionalization of graphene oxide for the adsorption of organic dyes and heavy metal ions with a superhigh capacity

2014 ◽  
Vol 2 (14) ◽  
pp. 5034-5040 ◽  
Author(s):  
Zhihui Dong ◽  
Dong Wang ◽  
Xia Liu ◽  
Xianfeng Pei ◽  
Liwei Chen ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Graphene Oxide ◽  
Synergistic Effect ◽  
Metal Ions ◽  
Surface Area ◽  
Surface Functionalization ◽  
Heavy Metal Ions ◽  
Organic Dyes ◽  
High Surface ◽  
High Surface Area

By utilizing the synergistic effect of poly-dopamine (PD) with functional groups and graphene oxide (GO) with a high surface area, a series of sub-nano thick PD layer coated GO (PD/GO) composites were fabricated and used for effectively decontaminating wastewater.

scholarly journals Adsorptive Removal of Heavy Metal Ions, Organic Dyes, and Pharmaceuticals by DNA–Chitosan Hydrogels

Gels ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 112
Author(s):  
Kayee Chan ◽  
Kohki Morikawa ◽  
Nobuyuki Shibata ◽  
Anatoly Zinchenko
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Organic Dyes ◽  
Double Helix ◽  
Adsorptive Removal ◽  
Adsorption Characteristics ◽  
Adsorption Capacities ◽  
Hydrogel Matrix ◽  
Dna Double Helix

DNA–chitosan (DNA–CS) hydrogel was prepared by in situ complexation between oppositely charged DNA and chitosan polyelectrolytes via electrostatic cross-linking to study its adsorption characteristics. The DNA–chitosan hydrogel matrix contains (i) cationic (NH3+) and anionic (PO4–) sites for electrostatic binding with ionic species, (ii) -OH and -NH2 groups and heteroaromatic DNA nucleobases for chelation of heavy metal ions, and (iii) DNA double-helix for recognition and binding to small organic molecules of various structures and polarities. DNA–CS hydrogels efficiently bind with Hg2+, Pb2+, Cd2+, and Cu2+ metal cations of significant environmental concern. Adsorption capacities of DNA–CS hydrogels for studied metal ions depend on hydrogel composition and pH of solution and reach ca. 50 mg/g at neutral pHs. Hydrogels with higher DNA contents show better adsorption characteristics and notably higher adsorption capacity to Hg2+ ions. Because of the co-existence of cationic and anionic macromolecules in the DNA–CS hydrogel, it demonstrates an affinity to both anionic (Congo Red) and cationic (Methylene Blue) dyes with moderate adsorption capacities of 12.6 mg/g and 29.0 mg/g, respectively. DNA–CS hydrogel can also be used for adsorptive removal of pharmaceuticals on conditions that their molecules are sufficiently hydrophobic and have ionogenic group(s). Facile preparation and multitarget adsorption characteristics of DNA–CS hydrogel coupled with sustainable and environmentally friendly characteristics render this system promising for environmental cleaning applications.

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