α-ketoglutaric acid modified chitosan/polyacrylamide semi-interpenetrating polymer network hydrogel for removal of heavy metal ions

2021 ◽  
pp. 127262
Author(s):  
Zhonghua Zhao ◽  
Yicheng Huang ◽  
Yihao Wu ◽  
Shuo Li ◽  
Huixian Yin ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Polymer Network ◽  
Interpenetrating Polymer Network ◽  
Modified Chitosan

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.

scholarly journals Preparation and characterization of p-sulfonated calix[4]arene functionalized chitosan hydrogel beads and their preliminary adsorption study towards removal of lead(II) and zinc(II) ions

2020 ◽  
Vol 16 (4) ◽  
pp. 429-432
Author(s):  
Hamizah Syahirah Mohamad Zubir ◽  
Mohd Haniff Wahid ◽  
Irene Ling ◽  
Hong Ngee Lim ◽  
Sazlinda Kamaruzaman ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Sodium Hydroxide Solution ◽  
Acetic Acid Solution ◽  
Chitosan Hydrogel ◽  
Metal Ion Removal ◽  
Hydrogel Beads ◽  
Modified Chitosan

p-sulfonated calix[4]arene functionalized chitosan hydrogel beads have been successfully prepared by mixing p-sulfonated calix[4]arene and chitosan in dilute acetic acid  solution (1% v/v), followed by dropping the mixture into sodium hydroxide solution to form beads with diameters of ~0.1 cm. The presence of the active sulfonate groups and the unique structure of calixarene render the material useful as an adsorbent for heavy metal ions. Metal adsorption on p-sulfonated calix[4]arene is possible through a combination of physical and ionic interactions. Atomic Absorption Spectroscopy (AAS) results showed that the amount of adsorbed metal ion is optimum at 10 ppm for all samples. The overall percentage of metal ion removal shows that p-sulfonated calix[4]arene modified chitosan is the best adsorbent with up to 98% removal achieved for Pb(II) and 90% removal for Zn(II). This is followed by p-sulfonated calix[4]arene and graphene oxide (GO) modified chitosan with up to 90% removal for Pb(II)  and 89% removal for Zn(II) and pure chitosan hydrogel beads with up to 60% removal for both Pb(II)  and Zn(II). The results clearly prove that the presence of p-sulfonated calix[4]arene can enhance the adsorption of heavy metal ions. In addition, the adsorbent shows higher Pb(II) removal compared to Zn(II).

Nanotechnology-Based Nano-Biosorbents

2020 ◽  
pp. 386-408
Author(s):  
Mintu Maan Dutta ◽  
Anushmita Charingia
Keyword(s):  
Heavy Metal ◽  
Wastewater Treatment ◽  
Metal Ions ◽  
Water Purification ◽  
Heavy Metal Ions ◽  
Membrane Separation ◽  
Water Bodies ◽  
Modified Chitosan ◽  
Purification Methods ◽  
Industrial Sources

Most countries worldwide face the problem related to clean and safe water. The major source of contamination of water bodies includes the discharges of wastes from various domestic and industrial sources (heavy metal ions, dyes, and pharmaceuticals). To overcome those problems, various water purification methods such as coagulation, flocculation, adsorption, membrane separation, biological, and electrochemical methods have been engaged. Adsorption using nano-biosorbents based on chitin, chitosan and modified chitosan, cellulose, alginate, micro algal has emerged as a better alternative for the removal of contaminants from drinking and wastewater treatment. The main advantages of these nano-biosorbents include its biodegradability and eco-friendliness, which have attracted researchers to this field.

Prospects for the Production and Application of New Zeolite-Like Sorption Materials for Waste Water Treatment in Railway Enterprises

2020 ◽  
Vol 24 (6) ◽  
pp. 4-9
Author(s):  
М.V. Obuzdina ◽  
E.A. Rush
Keyword(s):  
Heavy Metal ◽  
Wastewater Treatment ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Raw Materials ◽  
Waste Water Treatment ◽  
Polymer Network ◽  
Waste Products ◽  
Main Component ◽  
Sulfur Containing

The article presents the results of researches of zeolite modification in order to create sorbents for wastewater treatment from heavy metal ions. Zeolitive tuffs of deposit of the Zabaikalye Territory are considered as raw materials. It is proposed to modify zeolites with highly organosilicon compounds hexamethyldisilazane [(CH3)3Si]2NH and tetraethoxysilane (С2H5O)4Si, which leads to hydrophobization of the surface and an increase in adsorption capacity. A method for modifying the structure of natural zeolite with a sulfur-containing polymer obtained from waste products of epichlorohydrin, the main component of which is 1,2,3-trichloropropane, is described in more detail. A sulfur-containing polymer network is formed by using sulfur dissolution at room temperature in the monoethanolamine – hydrazine hydrate system and condensation with 1,2,3-trichloropropane. The result of applying a sulfur-containing polymer network is not only hydrophobization of the zeolite surface, but also the appearance of sulfur atoms in its composition, which increases the selectivity to heavy metal ions. Based on the obtained experimental data, the method of improvement the existing technologies for wastewater treatment at enterprises (railway transport) by introducing a deep post-treatment into the sorption unit scheme is proposed.

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