Preparation and characterization of sodium polyacrylate-grafted bentonite and its performance removing Pb<sup>2+</sup>from aqueous solutions

Xue, Nan; Wang, Luyan; Pei, Meishan; He, Youjun; Du, Yankai; Guo, Wenjuan

doi:10.1039/c6ra17214h

Cited by 28 publications

(7 citation statements)

References 47 publications

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“…The peaks at around 1160 and 1023 cm −1 are attributed to asymmetric stretching vibration of COC glycoside and CO stretching in the COH stretching, respectively, [30][31][32][33][34] while the peak at 895 cm −1 is related to COC bridge. The peaks at around 1160 and 1023 cm −1 are attributed to asymmetric stretching vibration of COC glycoside and CO stretching in the COH stretching, respectively, [30][31][32][33][34] while the peak at 895 cm −1 is related to COC bridge.…”

Section: Resultsmentioning

confidence: 99%

“…The FT‐IR spectra of physically cross‐linked cellulose shows obvious absorption peak at 3430 cm −1 , which is assigned to OH stretching. The peaks at around 1160 and 1023 cm −1 are attributed to asymmetric stretching vibration of COC glycoside and CO stretching in the COH stretching, respectively, while the peak at 895 cm −1 is related to COC bridge. Compared with those in the spectra of pure PANa and cellulose hydrogel, the intensity of these absorption peaks (3000–3600 cm −1 ) in the spectra of PANa‐cellulose hydrogel significantly decreased while other peaks kept similar intensity, indicating that the hydroxyl group on the cellulose chains partially reacted with PANa chains to form covalent cross‐linkers .…”

Section: Resultsmentioning

confidence: 99%

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Super‐Stretchable Zinc–Air Batteries Based on an Alkaline‐Tolerant Dual‐Network Hydrogel Electrolyte

Chen

Wang

et al. 2019

Advanced Energy Materials

329

296

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remains a challenge. Meanwhile, zincair battery provides a theoretical energy density up to 1086 Wh•kg −1 , even much higher than commercial lithium-ion batteries, promising to next-generation longlasting power system. [1][2][3][4][5] In addition, the process of assembling zinc-air battery does not require water-free and/or oxygenfree environment, which is in favor of scaling up at low cost. [6][7][8][9][10] Therefore, developing stretchable zinc-air batteries with stretchability and weavability will be highly attractive as a power unit for various flexible/wearable devices.The difficulty to develop super-stretchable zinc-air battery is that it must use strong alkaline electrolyte (always 6 m KOH) to achieve decent power density considering all zinc-air batteries with neutral electrolyte possess unacceptable low power output. [11,12] On the other hand, most super-stretchable hydrogels that are considered as an essential component of a stretchable energy storage device will lose their stretchability under such strong alkaline environment. Currently, a zincair battery is typically assembled using polyvinyl alcohol (PVA)-based electrolyte. [2,[13][14][15][16][17] However, the PVA-based electrolyte possesses very poor stretchability (even worse when alkaline electrolyte infiltrated), and meanwhile it shows limited ion-transport capability, resulting in poorly electrochemical performance and mechanical flexibility. [18][19][20][21] Although other hydrogels, such as polyacrylic acid (PAA), polyacrylamide (PAM), show strong water-retention capability and high stretchability, [22,23] unfortunately, they will lose their mechanical robustness, especially the stretchability, when they are incorporated with strong alkaline electrolyte. [24][25][26] Therefore, the absence of alkaline-tolerant hydrogel electrolyte with high stretchability and excellent ion transport capability is the key challenge to fabricate super-stretchable zinc-air battery and enhance its weavability. An alternative way to fabricate stretchable zinc-air battery (very limited stretchability with a maximum strain less than 10%) has been proposed, that is to use electron/ion-inactive stretchable substrate (e.g., rubber elastomer) or strain-accommodating engineering of device structure (e.g., fiber-shaped planar structure). [27][28][29] The problem is that the stretchable components are additional, and they are not involved in any chemical reactions. In some cases, Stretchable devices need elastic hydrogel electrolyte as an essential component, while most hydrogels will lose their stretchability after being incorporated with strong alkaline solution. This is why highly stretchable zinc-air batteries have never been reported so far. Herein, super-stretchable, flat-(800% stretchable) and fiber-shaped (500% stretchable) zinc-air batteries are first developed by designing an alkaline-tolerant dual-network hydrogel electrolyte. In the dualnetwork hydrogel electrolyte, sodium polyacrylate (PANa) chains contribute to the formation of soft domains and the carboxyl gr...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Super‐Stretchable Zinc–Air Batteries Based on an Alkaline‐Tolerant Dual‐Network Hydrogel Electrolyte

Chen

Wang

et al. 2019

Advanced Energy Materials

329

296

View full text Add to dashboard Cite

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“…GO was prepared based on Hummers' method [35,38]. Graphite flakes (0.6 g) and sodium nitrate (1 g) were added slowly into concentrated sulfuric acid (35 mL), maintaining the temperature of the ice water bath between 0 and 4 • C. Then, the potassium permanganate was added to the solution very slowly, while simultaneously maintaining the temperature at no more than 20 • C. Next, the solution was put into a water bath of 35 • C, with stirring, for 2 h. After that, 150 mL deionized water was slowly added to the solution and the temperature was maintained at 98 • C for 15 min.…”

Section: Preparation Of Go Spongementioning

confidence: 99%

Ultra-Highly Efficient Removal of Methylene Blue Based on Graphene Oxide/TiO2/Bentonite Sponge

et al. 2020

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An ultra-highly efficient Graphene Oxide/TiO2/Bentonite (GO/TiO2/Bent) sponge was synthesized using an in situ hydrothermal method. GO/TiO2/Bent sponge with a GO mass concentration of 10% exhibited the highest treatment efficiency of methylene blue (MB), combining adsorption and photocatalytic degradation, and achieved a maximum removal efficiency of 100% within about 70 min. To further prove the ultra-high removal capacity of the sponge, the concentration of MB in water increased to ten times the original concentration. At so high a MB concentration, the removal rate was still as high as 80% in 90 min. The photocatalytic mechanism of GO/TiO2/Bent sponge was discussed through XPS, PL and radicals quenching experiments. Here Bent can immobilize TiO2 and react with a photo-generated hole to increase the amount of hydroxyl radical; effectively enhancing the degradation of MB.GO sponge enlarges the sensitivity range of TiO2 to visible light by increasing the charge separation of TiO2 and reducing the recombination of photo-generated electron–hole pairs. Additionally, GO sponge with an interconnected porous structure provides an effective platform to immobilize TiO2/bent and makes them be easily recovered. The as-prepared sponge develops a simple and cost-effective strategy to realize the ultra-highly efficient treatment of dyes in wastewater.

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“…An obvious absorption peak at 3451 cm −1 in the spectrum of the GDP membrane belongs to O−H stretching, [37] and the peak at ≈1627 cm −1 is the C═O characteristic absorption peak of carboxylate. [38] Compared with the O−H absorption peak near 3480 cm −1 of GO and GP membranes, GD and GDP membranes have obvious red shift, which may be attributed to the formation of hydrogen bonds between GO and DODAB. [39] TGA is also used to demonstrate the good thermal stability of GDP membrane that could withstand up to 200 °C (Figure S9, Supporting Information).…”

Section: Resultsmentioning

confidence: 93%

Low‐Friction Graphene Oxide‐Based Ion Selective Membrane for High‐Efficiency Osmotic Energy Harvesting

Wang,

Chen

et al. 2023

Advanced Energy Materials

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Graphene‐based laminate membranes with selective ion‐transport capability show great potential in renewable osmotic energy harvesting. One of the great challenges is to reduce the overall energy barriers while remain the high ion selectivity in the transmembrane ion transport process. Here, a strategy is proposed to break the trade‐off between ion selectivity and permeability in laminar nanochannels using amphiphilic molecules as modifier, which enhances the surface charge density of nanochannel by loading more ion polymer with polar head and lows the frictional force of ion transport with hydrophobic tail. The conversion efficiency can reach to 32% in osmotic energy harvesting (0.5 m/0.01 m concentration gradient) after adopting this modifier. During the process of mixing real river water and seawater, the maximum power density can reach to 13.38 W m−2. The amphiphilic molecules also bind adjacent nanosheets, endowing the membrane's strong mechanical strength and high stability in aqueous solution. This work can open up a new way to regulate the transmembrane ion transport in 2D laminate membranes.

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Preparation and characterization of sodium polyacrylate-grafted bentonite and its performance removing Pb²⁺from aqueous solutions

Abstract: A new adsorbent, sodium polyacrylate (PAANa) grafted onto the surface of bentonite (Bent), was successfully synthesized by a facile and green Ce(iv)-redox process, to remove Pb2+ from aqueous solutions.

Cited by 28 publications

References 47 publications

Super‐Stretchable Zinc–Air Batteries Based on an Alkaline‐Tolerant Dual‐Network Hydrogel Electrolyte

Super‐Stretchable Zinc–Air Batteries Based on an Alkaline‐Tolerant Dual‐Network Hydrogel Electrolyte

Ultra-Highly Efficient Removal of Methylene Blue Based on Graphene Oxide/TiO2/Bentonite Sponge

Low‐Friction Graphene Oxide‐Based Ion Selective Membrane for High‐Efficiency Osmotic Energy Harvesting

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Preparation and characterization of sodium polyacrylate-grafted bentonite and its performance removing Pb2+from aqueous solutions

Abstract: A new adsorbent, sodium polyacrylate (PAANa) grafted onto the surface of bentonite (Bent), was successfully synthesized by a facile and green Ce(iv)-redox process, to remove Pb2+ from aqueous solutions.

Cited by 28 publications

References 47 publications

Super‐Stretchable Zinc–Air Batteries Based on an Alkaline‐Tolerant Dual‐Network Hydrogel Electrolyte

Super‐Stretchable Zinc–Air Batteries Based on an Alkaline‐Tolerant Dual‐Network Hydrogel Electrolyte

Ultra-Highly Efficient Removal of Methylene Blue Based on Graphene Oxide/TiO2/Bentonite Sponge

Low‐Friction Graphene Oxide‐Based Ion Selective Membrane for High‐Efficiency Osmotic Energy Harvesting

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Preparation and characterization of sodium polyacrylate-grafted bentonite and its performance removing Pb²⁺from aqueous solutions