A double network gel as low cost and easy recycle adsorbent: Highly efficient removal of Cd(II) and Pb(II) pollutants from wastewater

Chu, Libing; Liu, Chengbin; Zhou, Guiyin; Xu, Rui; Tang, Yanhong; Zeng, Zebing; Luo, Shenglian

doi:10.1016/j.jhazmat.2015.06.070

Cited by 150 publications

(60 citation statements)

References 33 publications

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“…However, when the MBA content is higher than 0.8%, the MBA will make the networks of hydrogel extremely dense and smooth The environmental conditions such as pH and ionic strength will have influences on the surface charge of adsorbent as well as the ionization degree and solubility of adsorbates, consequently influencing the removal efficiency of heavy metal ions. 2,[13][14] In order to evaluate the influence of environmental conditions on the adsorption of Pb 2+ and Cd 2+ by the P(AANa-co-AM)/GO hydrogel, a series of adsorption and Mg 2+ ) were carried out. The adsorption results of Pb 2+ and Cd 2+ by the P(AANa-co-AM)/GO hydrogel as a function of pH are present in Figure 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 This may be due to that the hydrated radius of Mg 2+ and Ca 2+ is smaller than that of Cd 2+ but larger than that of Pb 2+ .…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb²⁺ and Cd²⁺

Fan

Shenzhen

et al. 2016

ACS Sustainable Chem. Eng.

144

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A serial of cross-linked sodium acrylate and acrylamide copolymer /graphene oxide (P(AANa-co-AM)/GO) hydrogels with different mass ratios of acrylic acid (AA) to acrylamide (AM) and different contents of N,N-methylenebisacrylamide (MBA) were prepared via dispersive polymerization.The prepared hydrogels were characterized by XRD, FT-IR, TGA, SEM, and BET in detail. The removal efficiency of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel have been improved significantly due to the addition of 1.0wt% of GO. The P(AANa-co-AM)/GO hydrogel with AA/AM=1 and 0.8 wt% of MBA has the highest removal efficiency for Pb 2+ and Cd 2+ and a suitable swelling ratio, which was selected as the adsorbent for systematic adsorption of Pb 2+ and Cd 2+ from aqueous solutions.The adsorption capacity and removal efficiency of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel were dependent on pH, initial heavy metal ion concentration and adsorbent dosage. The presence of 0.01~0.05 M Mg 2+ or Ca 2+ has obvious effect on the adsorption of Cd 2+ . The adsorption kinetics and adsorption isotherms of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel followed pseudo-first order model and the Langmuir isotherm model, respectively. The maximum adsorption capacity of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel were calculated to be 452.3 and 196.4 mg/g at 298 K, respectively. The XPS analysis revealed that the adsorption mechanism of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel was ascribed to the chelation of -COOwith Pb 2+ and the ion-exchange of -COO -Na + with Cd 2+ , respectively. The P(AANa-co-AM)/GO hydrogel possesses good reusability and excellent fixed-bed column operation performance, which suggests that the P(AANa-co-AM)/GO hydrogel can be considered as a promising adsorbent for removing heavy metal ions from practical wastewater.wastewater. Exposure to Pb 2+ or Cd 2+ can lead to health hazards such as central nervous system damage, kidney and lung damage, anemia, bone lesions and infertility problems, and even cause cancer. 1-3 Removal of heavy metal ions from wastewater has been a hot issue. Various treatment technologies have been applied for removing heavy metal ions such as chemical precipitation, 3 ion-exchange, 4 adsorption, 5,6 flocculation, 7 electrolysis, 8 electrocoagulation 9 and membrane separation, 10-12 etc.Among them, adsorption is considered as a facile and effective technique, 13,14 some adsorbents such as biosorbents, 1 active carbon, 15 inorganic minerals, 16,17 and magnetic composites 5-6,18 have been investigated for removing heavy metal ions from aqueous solution. Generally, the adsorption efficiency depends mainly on the type of adsorbents. Recently, various studies have found that hydrogel adsorbents exhibited super adsorption capacity, wide pH independence, easy regeneration and good reusability for removal of toxic metal ions and dyes from wastewater. [13][14][19][20][21][22] As a novel adsorbent, hydrogels are polymers with three dimensional (3-D) networks which can be formed via physical or chemical...

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Section: Resultsmentioning

confidence: 99%

Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb²⁺ and Cd²⁺

Fan

Shenzhen

et al. 2016

ACS Sustainable Chem. Eng.

144

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“…S1, Supporting material, the adsorption capacity for Pb 2+ increased with the initial concentration from 0.1 to 30 mmol L −1 , and then remained stable as concentration was increased further. Thus, the maximum adsorption capacity of Alg‐Chi for Pb 2+ was calculated as 468.5 mg g −1 , which is higher than that of most reported sorbents for Pb 2+ (Table ) …”

Section: Resultsmentioning

confidence: 66%

“…Owing to the low cost, multiple functional groups (e.g. −COOH, −OH and − NH 2 ), biodegradability and biocompatibility, sodium alginate and chitosan are most commonly used as functional reagents for treating Pb 2+ ‐containing wastewater . Sodium alginate, produced by brown algae that are abundant in nature, is widely used as a thickener in the food industry and as an antidote for heavy metal poisoning in the field of medicine.…”

Section: Introductionmentioning

confidence: 99%

“…−COOH, −OH and − NH 2 ), biodegradability and biocompatibility, sodium alginate and chitosan are most commonly used as functional reagents for treating Pb 2+ -containing wastewater. [5][6][7] Sodium alginate, produced by brown algae that are abundant in nature, is widely used as a thickener in the food industry and as an antidote for heavy metal poisoning in the field of medicine. Recent studies have shown that immobilizing alginate onto silica, 8 polyaniline nanofibers, 9 SBA-15, 10 and maghemite 11 can efficiently remove Pb 2+ and Cu 2+ in wastewater.…”

Section: Introductionmentioning

confidence: 99%

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Highly efficient removal of toxic Pb²⁺ from wastewater by an alginate–chitosan hybrid adsorbent

Wang

Jin

Wang

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND In this study, a low‐cost and environment‐friendly alginate–chitosan hybrid adsorbent (depicted as Alg‐Chi) was developed for the removal of Pb2+ from water. RESULTS Experimental results showed that the Alg‐Chi exhibits high selectivity and affinity for Pb2+. The selectivity coefficients of the Alg‐Chi for Pb2+/Cr3+, Pb2+/Co2+ Pb2+/Cd2+, Pb2+/Zn2+, and Pb2+/Cu2+ are all >5. It can uptake 96.8% of Pb2+ from Pb2+‐containing solutions (1.5 mmol L−1), and the maximum adsorption capacity for Pb2+ reaches 468.5 mg g−1, which is higher than that of most reported adsorbents for Pb2+. Moreover, the Alg‐Chi can also be regenerated via simple acid elution and used repeatedly without loss in adsorption ability. CONCLUSIONS Analysis of the adsorption mechanism indicated that the Alg‐Chi adsorbed Pb2+ mainly through ion exchange and chemical coordination. Green and low‐cost raw materials, simple preparation process, efficient removal efficiency and recyclable, these characteristics give the synthetic Alg‐Chi broad application prospects in the field of Pb2+‐containing wastewater treatment. © 2018 Society of Chemical Industry

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“…Since heavy metals are recognized to be nonbiodegradable, it is advisable to remove them from industrial wastewater before discharge into the environment. Several methods such as ion exchange, solvent extraction, reverse osmosis, precipitation, electrochemical and adsorption processes have been proposed for the treatment of sewage contaminated with heavy metals [4][5]. However, the above mentioned methods are not economically feasible for small and medium size industries.…”

Section: Introductionmentioning

confidence: 99%

Intercalation of oxalate ions in the interlayer space of a layered double hydroxide for nickel ions adsorption

Doungmo

Kamgaing²,

Temgoua³

et al. 2016

IJBAS

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In this study, sorption properties of a synthesized anionic clay were enhanced by the intercalation of oxalate ions in its interlayer space. The pristine and modified clay materials were characterized by X-ray diffraction, Fourier transform infrared spectroscopy and thermal analysis. These techniques confirmed the presence of oxalate ions in the interlayer space of the clay. The intercalated clay was then used as a matrix for the sorption in batch mode of nickel ions in aqueous solution. The influence of a number of parameters such as contact time, pH, initial concentration of the analyte and adsorbent dosage were studied. The maximum adsorption of nickel was obtained at pH 6, that is, about 90% Ni 2+ removal. The adsorbent/adsorbate equilibrium follows a pseudo-second order kinetics and best matches the Langmuir model. The modified clay was shown to be efficient matrix for the sorption of nickel ions.

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A double network gel as low cost and easy recycle adsorbent: Highly efficient removal of Cd(II) and Pb(II) pollutants from wastewater

Cited by 150 publications

References 33 publications

Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb²⁺ and Cd²⁺

Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb²⁺ and Cd²⁺

Highly efficient removal of toxic Pb²⁺ from wastewater by an alginate–chitosan hybrid adsorbent

Intercalation of oxalate ions in the interlayer space of a layered double hydroxide for nickel ions adsorption

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A double network gel as low cost and easy recycle adsorbent: Highly efficient removal of Cd(II) and Pb(II) pollutants from wastewater

Cited by 150 publications

References 33 publications

Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb2+ and Cd2+

Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb2+ and Cd2+

Highly efficient removal of toxic Pb2+ from wastewater by an alginate–chitosan hybrid adsorbent

Intercalation of oxalate ions in the interlayer space of a layered double hydroxide for nickel ions adsorption

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Product

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Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb²⁺ and Cd²⁺

Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb²⁺ and Cd²⁺

Highly efficient removal of toxic Pb²⁺ from wastewater by an alginate–chitosan hybrid adsorbent