scholarly journals Tough and Self-Healable Nanocomposite Hydrogels for Repeatable Water Treatment

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 880 ◽  
Author(s):  
Kunhao Yu ◽  
Di Wang ◽  
Qiming Wang
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Dye Degradation ◽  
Uv Light ◽  
Polymer Network ◽  
Polymer Chains ◽  
Self Healing ◽  
Nanocomposite Hydrogel ◽  
Water Stream

Nanomaterials with ultrahigh specific surface areas are promising adsorbents for water-pollutants such as dyes and heavy metal ions. However, an ongoing challenge is that the dispersed nanomaterials can easily flow into the water stream and induce secondary pollution. To address this challenge, we employed nanomaterials to bridge hydrogel networks to form a nanocomposite hydrogel as an alternative water-pollutant adsorbent. While most of the existing hydrogels that are used to treat wastewater are weak and non-healable, we present a tough TiO2 nanocomposite hydrogel that can be activated by ultraviolet (UV) light to demonstrate highly efficient self-healing, heavy metal adsorption, and repeatable dye degradation. The high toughness of the nanocomposite hydrogel is induced by the sequential detachment of polymer chains from the nanoparticle crosslinkers to dissipate the stored strain energy within the polymer network. The self-healing behavior is enabled by the UV-assisted rebinding of the reversible bonds between the polymer chains and nanoparticle surfaces. Also, the UV-induced free radicals on the TiO2 nanoparticle can facilitate the binding of heavy metal ions and repeated degradation of dye molecules. We expect this self-healable, photo-responsive, tough hydrogel to open various avenues for resilient and reusable wastewater treatment materials.

scholarly journals A Short Review on the N,N-Dimethylacrylamide-Based Hydrogels

Gels ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 234
Author(s):  
Ayatzhan Akhmetzhan ◽  
Nurbala Myrzakhmetova ◽  
Nurgul Amangeldi ◽  
Zhanar Kuanyshova ◽  
Nazgul Akimbayeva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Large Scale ◽  
Short Review ◽  
Self Healing ◽  
Practical Applications ◽  
Metal Ion Removal

Scientists have been encouraged to find different methods for removing harmful heavy metal ions and dyes from bodies of water. The adsorption technique offers promising outcomes for heavy metal ion removal and is simple to run on a large scale, making it appropriate for practical applications. Many adsorbent hydrogels have been developed and reported, comprising N,N-dimethylacrylamide (DMAA)-based hydrogels, which have attracted a lot of interest due to their reusability, simplicity of synthesis, and processing. DMAA hydrogels are also a suitable choice for self-healing materials and materials with good mechanical properties. This review work discusses the recent studies of DMAA-based hydrogels such as hydrogels for dye removal and the removal of hazardous heavy metal ions from water. Furthermore, there are also references about their conduct for self-healing materials and for enhancing mechanical properties.

Biocompatible Self-Healing Hydrogels Based On Boronic Acid-Functionalized Polymer And Laponite Nanocomposite Applied For Water Pollutant Removal

2021 ◽  
Author(s):  
Xue-Ting Wang ◽  
Xudong Deng ◽  
Tuo-Di Zhang ◽  
Xi Zhang ◽  
Wen-Pu Shi ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Organic Dyes ◽  
Low Cost ◽  
Covalent Bond ◽  
Pollutant Removal ◽  
Poly Vinyl Alcohol ◽  
Self Healing ◽  
Adsorption Method

Abstract The problem of global water pollution is becoming more and more severe, among which organic dyes and heavy metal ions are two typical types of the most common pollutants. The adsorption method for water purification and wastewater treatment is widely studied and applied. Hydrogel has unique advantages in the field of adsorption due to its three-dimensional porous structure. In this paper, a new type of self-healing hydrogels based on reversible covalent bond were prepared by mixing poly(vinyl alcohol) (PVA) and 2-aminophenylboronic acid modified polyacrylic acid (PAA-2APBA). In addition, the introduction of laponite nanoparticles into the hydrogel can increase both the mechanical strength and adsorption efficiency. This low-cost PAA-2APBA/PVA/laponite nano-composite hydrogel could efficiently remove the organic dyes and heavy metal ions in model waste water through simple immersion, which makes it have application prospects in the fields of both biomedical and environmental engineering.

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.

Removal of dyes and heavy metal ions from water by magnetic hydrogel beads based on poly(vinyl alcohol)/carboxymethyl starch-g-poly(vinyl imidazole)

RSC Advances ◽  
2015 ◽  
Vol 5 (79) ◽  
pp. 64106-64118 ◽  
Author(s):  
Zahra Sekhavat Pour ◽  
Mousa Ghaemy
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Poly Vinyl Alcohol ◽  
Nanocomposite Hydrogel ◽  
Hydrogel Beads ◽  
Carboxymethyl Starch ◽  
Magnetic Hydrogel ◽  
Highly Porous ◽  
Magnetic Nanocomposite Hydrogel

Highly porous magnetic nanocomposite hydrogel (m-CVP) beads were prepared and used for the removal of dyes and heavy metal ions.

scholarly journals Fabrication of Lignin-based Magnetic Adsorbent via Thiol-ene Click Reaction for the Effective Removal of Pb(II)

2021 ◽  
Author(s):  
Xuan Zhou ◽  
Yunlong Liu ◽  
can Jin ◽  
Guomin Wu ◽  
Guifeng Liu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Click Reaction ◽  
Uv Light ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
High Adsorption ◽  
Adsorption Selectivity ◽  
Kinetics And Isotherms

Abstract The effective and selective removal of heavy metal ions from sewage is a major challenge, and of great significance to the treatment and recovery of metal waste. Herein, a novel magnetic lignin-based adsorbent L@MNP was synthesized by thiol-ene click reaction under UV light irradiation. Multiple characterization techniques containing FT-IR, XRD, elemental analysis, VSM, SEM and TEM confirmed the formed nano-morphology and structure of L@MNP. Effects of pH, contact time, initial metal concentration and temperature on the batch adsorption of Pb(II) by L@MNP were investigated. Due to the existence of sulfur and oxygen containing sites, the maximum adsorption capacity of L@MNP for Pb(II) could reach 97.38 mg/g, while the adsorption equilibrium was achieved within 30 min. Adsorption kinetics and isotherms were well described by the pseudo-second-order model and Langmuir model, respectively, suggesting a chemical and monolayer adsorption process. In addition, L@MNP showed a high adsorption selectivity (kPb = 0.903) toward Pb(II) in the presence of other co-existing metal ions. Experimental results also revealed that L@MNP displayed structural stability, easy recovery under external magnetic field, and acceptable recyclability after the fifth cycle. Considering its facile preparation, low cost and high adsorption efficiency, the developed L@MNP adsorbent demonstrated great potential in removing heavy metal ions from wastewater.

Adsorption Properties for Superabsorbent of Inverse Suspension Polymerization Poly(acrylate-Co-Acrylamide)

2011 ◽  
Vol 239-242 ◽  
pp. 851-854 ◽  
Author(s):  
Jian Jun Xie ◽  
Na Li ◽  
Kai Huang ◽  
Xin Qiang Han
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Selective Adsorption ◽  
Suspension Polymerization ◽  
Polymer Network ◽  
Adsorption Properties ◽  
Ph Values ◽  
Inverse Suspension Polymerization

Superabsorbent polymers are lightly crosslinked, hydrophilic polymer network having many functional groups. The adsorption properties in heavy metal ion solutions using poly(acrylate-co-acrylamide)(PAAM) are investigated. It is found that PAAM has a high uptake to heavy metal ions, and that the adsorption of heavy metal ions is greatly influenced by pH and the initial solution concentrations. The biggest and the smallest amount of adsorption are Cu2+and Cr3+in CuCl2and CrCl3solution, respectively. It was feasible for selective adsorption of the metal ions in the solution onto PAAM hydrogel by controlling the pH values of the mixing solution for CuCl2, FeCl3, CrCl3.Langmiur equatiom can satisfactorily fit for the adsorption of Cu2+while not fit for that of Fe3+and Cr3+.

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