Adsorption of Cd(II), Cu(II), and Zn(II) by granules prepared using sludge from a drinking water purification plant

Du, Xiaoli; Cui, Shenshen; Fang, Xing; Wang, Qian; Liu, Guizhong

doi:10.1016/j.jece.2020.104530

Cited by 30 publications

(15 citation statements)

References 37 publications

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“…The PNIPA exhibited bands at 1657 cm −1 and 1543 cm −1 , corresponding to a stretching vibration of C O (p-π of unshared electron pair on N atom with carbonyl) and C-N-H, and at 3310 cm −1 for N H stretching vibration. 24 Compared with the FTIR spectra of SA and SA-PNIPA, a wider and stronger peak at ≈3437 cm −1 appeared for NH 2 -SA-PNIPA, which is the overlapping peak of O H and N H. 9 This means that the amino group is modified and the temperature-sensitive hydrogel microspheres are synthesized. In addition, a quantitative amount of the elements was determined by XPS element analysis and the results of the atomic content are listed in Table S1.…”

Section: Characterization Of the Hydrogelmentioning

confidence: 99%

Cu(II) and Cd(II) capture using novel thermosensitive hydrogel microspheres: adsorption behavior study and mechanism investigation

Tang

Huang

Tun

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: At present, various kinds of hydrogel adsorbents are applied to the treatment of heavy metal ions in wastewater. In this work, we focused on the adsorption of cadmium [Cd(II)] and copper [Cu(II)] onto microspheres of a novel thermosensitive hydrogel (NH 2 -SA/PNIPA, aminated sodium alginate/poly-N-isopropyl acrylamide), studied the effect of temperature on the phase transition of the hydrogel in detail, and discussed the influence on the adsorption behavior of metal ions in the hydrogel. RESULTS:The NH 2 -SA/PNIPA exhibited a higher adsorption efficiency under the conditions of interfering monovalent cationic and neutral pH. The adsorption capacities based on the Langmuir model were 57.2 mg g -1 for Cu(II) and 100.5 mg g -1 for Cd(II) at 20°C, respectively. Higher temperature facilitated the adsorption process and also led to the volume shrinkage and hydrophobicity of NH 2 -SA/PNIPA. The metal ions had different hydration and hence different adsorption capacities, of 56.7 mg g -1 for Cu(II) and 88.6 mg g -1 for Cd(II) at 40°C. The results of diffusion behavior analysis showed that the diffusion coefficients were ≈1 × 10 −11 m 2 s -1 . The adsorption performance of NH 2 -SA/PNIPA hardly decreased even after five cycles. In addition, the adsorption process was controlled mainly by the complexation reaction. CONCLUSION:The novel hydrogel microspheres overcame the deficiency of conventional adsorbents and possessed high diffusibility. This work provides a theoretical basis and empirical evidence for enhancement of adsorbents for removing heavy metals in wastewater.

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Section: Characterization Of the Hydrogelmentioning

confidence: 99%

Cu(II) and Cd(II) capture using novel thermosensitive hydrogel microspheres: adsorption behavior study and mechanism investigation

Tang

Huang

Tun

et al. 2021

J of Chemical Tech & Biotech

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“…Hence, from these findings, it was validated that the pseudo-first-order model is the best apt model to exhibit the Cd(II) ion eradication by Fe 3 O 4 @SiO 2 -NH 2 nanoparticles. In the solid-liquid sorption technique, the exchange of solutes can be either an external mass transfer, an intraparticle diffusion or a combined method [65,66]. In the case of the removal process under study, Cd(II) is transported through the following sequences below:…”

Section: Adsorbents Q M (Mg/g) Referencesmentioning

confidence: 99%

One-Step Fabrication of Amino-Functionalized Fe3O4@SiO2 Core-Shell Magnetic Nanoparticles as a Potential Novel Platform for Removal of Cadmium (II) from Aqueous Solution

et al. 2022

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Fe3O4@SiO2-NH2 core-shell magnetic nanoparticles were developed by a rapid one-step precipitation route followed by reverse microemulsion and amine functionalization. In this study, an Fe3O4@SiO2-NH2 nanoparticle was used to evaluate its adsorption efficiency for the treatment of a synthetic solution of Cd(II) ion. The structural and physicochemical properties of Fe3O4@SiO2-NH2 nanoparticles were characterized by XRD, SEM-EDAX, TEM, FTIR and TGA. From the TEM analysis, the morphology of Fe3O4@SiO2-NH2 was found as 100–300 nm. In TGA, the first weight loss was noticed between 373 and 573 K, the second was between 673 and 773 K and the final weight loss took place above 773 K. Batch experimental tests, such as pH, dosage of Fe3O4@SiO2-NH2, Cd(II) ion concentration, temperature as well as interaction time, were conducted and evaluated. Experimental study data were used for the non-linear forms exhibited by isotherms and kinetics of the sorption procedure. The equilibrium adsorption observations were adequately combined with pseudo-first-order kinetics as well as Freundlich isotherm. Monolayer maximum adsorption capacity was found to be 40.02 mg/g, recorded at pH 6 with an interaction time of 30 min, temperature of 303 K and sorbent dose of 2.0 g/L. The thermodynamic study indicated that the adsorption process was an exothermic, spontaneous reaction (−∆oo = −15.46–7.81 (kJ/mol)). The as-synthesized sorbent had excellent recyclability, and its adsorption efficiency was maintained after five cycles of reuse. The findings of the study exhibited the magnetic Fe3O4@SiO2-NH2-nanoparticle as an alternative effective adsorbent in eradicating Cd(II) ions from aqueous solution.

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“…On the other hand, the numerous hydroxyl groups on the surface of GSC (e.g. Al-OH and Fe-OH) (Illés & Tombácz 2003;Du et al 2020) would be protonated in an acidic solution or deprotonated in an alkaline solution, resulting in a positive surface charge or negative surface charge of GSC, respectively. The acid condition (pH , 4) is more favorable for DOM adsorption on GSC due to the electrostatic interaction between DOM and GSC.…”

Section: Ph Effectmentioning

confidence: 99%

“…For example, a granular sludge-clay (GSC) adsorbent using the readily available sludge from waterworks was synthesized to investigate the removal of Cu(II), Zn(II), and Cd(II). The GSC demonstrated good effectiveness for the removal of heavy metals (Du et al 2020). Therefore, the extensive use of sludge has become an important issue from the point of view of engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Removal of dissolved organic matter in road runoff by granules prepared using sludge from waterworks

Tian

Yin

et al. 2022

Water Supply

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This work assessed the elimination of dissolved organic matters (DOM) in road runoff by a granular sludge-clay (GSC) adsorbent. The rates of adsorption were found to be consistent with the pseudo-second-order kinetic model. The data at equilibrium resulted in a maximum adsorption capacity of 4.466 mg/g at 298 K, which was in good agreement with the Langmuir isotherm model. The adsorption of DOM relies on pH. The higher removal efficiency of DOM was observed at pH = 4.0 and 7.0. To clarify the related adsorption mechanism, isolated DOM fractions and their removal potentials were identified. The results showed hydrophobic acid (HoA) and hydrophobic neutral (HoN) fractions which contained abundant fulvic-like substances were more preferentially removed by the GSC. The adsorption mechanism of DOM in road runoff by the GSC involves both electrostatic attraction and ligand exchange reaction. GSC synthesized using the sludge from waterworks is a very promising filler that can be applied in some green infrastructures for removing DOM in the road runoff.

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Adsorption of Cd(II), Cu(II), and Zn(II) by granules prepared using sludge from a drinking water purification plant

Cited by 30 publications

References 37 publications

Cu(II) and Cd(II) capture using novel thermosensitive hydrogel microspheres: adsorption behavior study and mechanism investigation

Cu(II) and Cd(II) capture using novel thermosensitive hydrogel microspheres: adsorption behavior study and mechanism investigation

One-Step Fabrication of Amino-Functionalized Fe3O4@SiO2 Core-Shell Magnetic Nanoparticles as a Potential Novel Platform for Removal of Cadmium (II) from Aqueous Solution

Removal of dissolved organic matter in road runoff by granules prepared using sludge from waterworks

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