Optimized synthesis of novel hydrogel for the adsorption of copper and cobalt ions in wastewater

Zhang, Wei; Hu, Lishuang; Hu, Shuangqi; Liu, Yang

doi:10.1039/c9ra00227h

Cited by 36 publications

(12 citation statements)

References 56 publications

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“…There has also been work carried out on cobalt(II) adsorption by using Si/Ti-based, amino-functionalized hybrids, 15 graphite, activated carbon, 16 or hydrogels. 17 These investigations highlight the present interest in the development of new materials as sorbents for cobalt(II).…”

Section: ■ Introductionmentioning

confidence: 92%

“…Zhuang and Wang obtained a maximum sorption capacity of 15.24 mg/g using a magnetic graphene oxide/chitosan composite as a sorbent. There has also been work carried out on cobalt(II) adsorption by using Si/Ti-based, amino-functionalized hybrids, graphite, activated carbon, or hydrogels . These investigations highlight the present interest in the development of new materials as sorbents for cobalt(II).…”

Section: Introductionmentioning

confidence: 94%

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Membrane-Filtered Kraft Lignin–Silica Hybrids as Bio-Based Sorbents for Cobalt(II) Ion Recycling

et al. 2020

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Efficient and sustainable recycling of cobalt(II) is of increasing importance to support technological development in energy storage and electric vehicle industries. A composite material based on membrane-filtered lignin deposited on nanoporous silica microparticles was found to be an effective and sustainable sorbent for cobalt(II) removal. This bio-based sorbent exhibited a high sorption capacity, fast kinetics toward cobalt(II) adsorption, and good reusability. The adsorption capacity was 18 mg Co(II) per gram of dry adsorbent at room temperature (22 °C) at near-neutral pH, three times higher than that of the summarized capacity of lignin or silica starting materials. The kinetics study showed that 90 min is sufficient for effective cobalt(II) extraction by the composite sorbent. The pseudo-second-order kinetics and Freundlich isotherm models fitted well with experimentally obtained data and confirmed heterogeneity of adsorption sites. The promising potential of the lignin−silica composites for industrial applications in the cobalt recovering process was confirmed by high values of desorption in mildly acidic solutions.

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Section: ■ Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 94%

Membrane-Filtered Kraft Lignin–Silica Hybrids as Bio-Based Sorbents for Cobalt(II) Ion Recycling

et al. 2020

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“…The results suggested that the active sites on the hydrogel surface are homogenously distributed. The adsorption of Pb(II) ions by PC-PAAc/GA hydrogel is a chemical adsorption process [64]. It is also noted that PC-PAAc/GA hydrogel contains many hydroxyl and carboxylic groups that can attract and coordinate with Pb (II) cations.…”

Section: Adsorption Studymentioning

confidence: 99%

Gamma irradiation synthesis of pectin- based biohydrogels for removal of lead cations from simulated solutions

et al. 2022

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Bio-based hydrogels (denoted as PC-PAAc/GA) comprised of Pectin (PC) and polyacrylic acid (PAAc) reinforced with different ratios of gallic acid (GA) were prepared by gamma radiation at irradiation dose 20 kGy. The prepared hydrogels were investigated by different analytical tools. The swelling performance was studied versus time, pH of the medium and gallic acid content. The experimental data depicted that the swelling increases with pH of medium until the equilibrium of swelling after 350 min. The maximum swelling was attained at pH10 for both PC-PAAc and PC-PAA/GA1.5. Also, the data reveal that the incorporation of GA in the hydrogel matrix enhanced the swelling performance of the hydrogel up to an optimum value of GA, i.e. PC-PAA/GA1.5. Further increase in GA concentration leads to formation of a highly crosslinked structure with reduced swelling. The results demonstrated that the prepared hydrogels displayed excellent antibacterial activity against gram + ve bacteria (E.coli) and gram-ve bacteria (S.aureus). This potent antimicrobial activity is mainly originated from GA which was proved as a strong antibacterial agent. Moreover, the removal performance of the investigated hydrogels was verified towards Pb+2 cation as one of the most poisonous heavy metals. The data revealed that the maximum removal percentage of Pb (II) was attained by PC-PAAc/GA1.5 hydrogel (90 mg g−1). The correlation coefficients of the Langmuir model are too higher than that of the Freundlich model that assumed the adsorption of lead cations is mainly a chemical process.

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“…The thermodynamics of the adsorption of metal ions using the Cr-MOF/AC composite was investigated by varying the temperature in the range of 298–318 K under the optimum conditions. The thermodynamic parameters including Gibbs free energy (Δ G 0 ), enthalpy (Δ H 0 ), and entropy (Δ S 0 ) were obtained using the following equations and shown in Table : − where R (8.314 J/mol.K) and T (K) are the universal gas constant and the temperature of the solution, respectively. The results have shown that the values Δ G 0 were negative for both the Pb(II) and Co(II) ions and decreased with the increase of temperature, suggesting the spontaneous nature of the adsorption.…”

Section: Resultsmentioning

confidence: 99%

Efficient Removal of Pb(II) and Co(II) Ions from Aqueous Solution with a Chromium-Based Metal–Organic Framework/Activated Carbon Composites

Far

Hasanzadeh

Najafi

et al. 2021

Ind. Eng. Chem. Res.

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Herein, an efficient adsorbent based on an activated carbon and metal−organic framework was developed for the adsorption of heavy metals from an aqueous solution. The structural and morphological characterizations of the Cr-MOF/ AC composite were evaluated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM), exhibiting the formation of crystalline cubicshaped particles. The Cr-MOF/AC composite showed 3-fold higher specific surface area (2440 m 2 /g) than AC. The response surface methodology was employed to find the optimum adsorption conditions for the fast and efficient removal of lead and cobalt ions. The study of the kinetics of adsorption showed that the metal ions adsorption followed the pseudo-second-order model. The resultant composite was proved to be an excellent and highly efficient adsorbent with the adsorption capacity as high as 127 and 138 mg/g for lead and cobalt, respectively, under optimal conditions (pH = 5, an adsorption time of 40 min, adsorbent content of 25 mg, and metal ion concentration of 70 ppm). A further investigation on the reusability of adsorbent was also carried out, demonstrating the almost unchanged structure of the Cr-MOF/AC composite after five regeneration cycles. The Cr-MOF/AC composite exhibits a great potential for heavy metal adsorption and wastewater treatment.

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Optimized synthesis of novel hydrogel for the adsorption of copper and cobalt ions in wastewater

Abstract: Metal ions in wastewater endanger the environment and even human life. In this study, an optimized method was used to synthesize an excellent hydrogel to treat these metal ions.

Cited by 36 publications

References 56 publications

Membrane-Filtered Kraft Lignin–Silica Hybrids as Bio-Based Sorbents for Cobalt(II) Ion Recycling

Membrane-Filtered Kraft Lignin–Silica Hybrids as Bio-Based Sorbents for Cobalt(II) Ion Recycling

Gamma irradiation synthesis of pectin- based biohydrogels for removal of lead cations from simulated solutions

Efficient Removal of Pb(II) and Co(II) Ions from Aqueous Solution with a Chromium-Based Metal–Organic Framework/Activated Carbon Composites

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