The adsorption of Pb(II) on Mg2Al layered double hydroxide

Zhao, Donglin; Sheng, Guodong; Hu, Jun; Chen, Changlun; Wang, Xiangke

doi:10.1016/j.cej.2011.03.082

Cited by 267 publications

(94 citation statements)

References 60 publications

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“…For MIEX resin, it has many pores on the external and internal surface, indicating that the surface of the adsorbent is heterogeneous. In addition, Zhao et al suggested that the Freudlich model could give good simulation to the equilibrium data at low and intermediate adsorbate concentrations [47]. In the present study, the TA concentration ranges from 1 to 10 mg/L, which is consistent with the assumption of the Freudlich model.…”

Section: Adsorption Equilibriumsupporting

confidence: 76%

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Ding¹,

Zhu²,

Du³

et al. 2017

Pol. J. Environ. Stud.

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Tannic acid (TA) is a component of natural organic matter (NOM) and is ubiquitously present in most surface and groundwater due to the decomposition of plant biomass [1][2]. Previous research has demonstrated that TA is toxic for aquatic organisms such as algae, phytoplankton, fish, and invertebrates, which can cause serious environment problems [3]. Particularly, TA can react with chlorine and form carcinogenic disinfection by-products (DBPs) during the conventional chlorination disinfection process of drinking water [4][5]. Therefore, it is necessary to seek effective methods for reducing and removing TA from raw water. [12,16] have been utilized to remove TA from water and wastewater. Among different adsorbents, the anion ion-exchange resin is considered one of the most effective methods due to its high removal efficiency [17]. As a novel anion ionexchange resin, magnetic ion exchange (MIEX) resin can be a potential candidate for TA removal with its promising technology for NOM removal from drinking water [18].Pol. J. Environ. Stud. Vol. 26, No. 3 (2017) This study evaluated the removal characteristics of tanic acid (TA) adsorbed on MIEX resin by batch experiments. MIEX resin can effectively remove TA from raw water at pH 6-9. Chloride and sulfate have adverse effect on the removal of TA. Conversely, bicarbonate can further the removal of TA. The Elovich model is the most suitable for depicting the kinetic process, and liquid film diffusion dominates the adsorption rate. The Freundlich model is reliable for describing the adsorption equilibrium. Adsorption is an endothermic, entropy-driving, and thermodynamically spontaneous process. The energy changes confirm the physical adsorption and dominate adsorption behavior. The sodium chloride solution (0.5%) can effectively regenerate the MIEX resin saturated TA, and the regenerated resin can be used circularly. Therefore, MIEX resin is a promising adsorbent for the removal of TA from raw water.

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Section: Adsorption Equilibriumsupporting

confidence: 76%

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Ding¹,

Zhu²,

Du³

et al. 2017

Pol. J. Environ. Stud.

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“…At pH above 2, organic matters normally are negatively charged due to the deprotonation of the abounding carboxylic and phenolic groups at pH > 2 (Table S1 †). 32 Thus FA or HA can be strongly adsorbed on the positively charged surface of the rehydrated LDH as also conrmed by zeta potential determination (Fig. S2 †), and subsequently, the further potential complexation of FA or HA with Ni can lead to the enhancement of the Ni removal due to the increasing adsorption of FA or HA by the rehydrated LDH.…”

Section: Parameters Langmuir Ttingmentioning

confidence: 99%

Synergistic effect of humic and fulvic acids on Ni removal by the calcined Mg/Al layered double hydroxide

Fang

Chen

et al. 2015

RSC Adv.

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Discharge of Ni(II) containing wastewater to terrestrial environment can lead to serious pollution issues. This study presents a facile, cost-effective and highly efficient method to rapidly remove Ni(II) from wastewater using a calcined Mg/Al layered double hydroxide (LDH), which is a pioneering investigation of using the calcined LDH to remove the positively charged Ni(II) ions. The kinetic studies showed that the removal of Ni(II) was very rapid with a pseudo first order k of up to 3.6 AE 0.5 h À1 , and maximum removal of Ni(II) was up to 204.2 AE 10.6 mg g À1 . In addition, our results reveal that both humic (HA) and fulvic acids (FA) can strongly bind to the surface of the LDH, which demonstrates that the calcined LDH can effectively remove both cationic and anionic pollutants in a single process. With the increase of pH up to 7.5, the removal of Ni, HA and FA by the calcined LDH are all drastically enhanced. Our study also demonstrated a strong synergetic effect of FA and HA on the Ni(II) removal by the calcined LDH, with a maximum Ni(II) removal of 290.6 AE 16.4 mg g À1 and 480.4 AE 21.3 mg g À1 at pH 7, respectively. The possible mechanism of the Ni(II) removal can be due to the incorporation of Ni into the layered structure by replacing the

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“…1(b). It may be because the group is hidden by the band at 1,394 cm -1 [19,20]. The absorption bands at 1,600 cm -1 and 1,394 cm -1 are characteristic of the symmetrical and asymmetrical vibration of COO-groups.…”

Section: Synthesis and Characterization Of Ldhmentioning

confidence: 99%

“…K F is a measure of adsorption capacity, and 1/n refers to the adsorption intensity of the system. It is shown that 1/n values between 0.1 and 1.0 refers to an interaction between exchange sites in the adsorbent and Cd(II) cations [20,26,28,29]. The K F and 1/n in Table 2 indicates the adsorption process is favorable.…”

Section: Adsorption Isotherms and Kinetic Modelsmentioning

confidence: 99%

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Adsorption of Cd(II) on Zn-Al LDHs (Layered Double Hydroxides) Intercalated with Chelating Agents EDTA

Zhang¹,

Kano²,

Inoue³

2016

JCCE

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Abstract:The hydrotalcite-like compound [Zn 2 Al(OH) 6 ]NO 3 ·mH 2 O (shorted as ZnAl-NO 3 ) was intercalated with the chelating agent EDTA (ethylene diamine tetraacetic acid) by anion exchange to uptake cadmium ion from aqueous solutions. The materials synthesized in this work were characterized by chemical analysis, FT-IR (fourier transform infrared spectroscopy), XRD (X-ray powder diffraction) to confirm their properties. In order to investigate the optimum conditions for Cd(II) adsorption, the amount of Cd(II) adsorbed by Zn-Al LDHs intercalated with EDTA (ZnAl-EDTA) under different conditions (i.e., adsorbent dosage, temperature and contact time) were determined by ICP-AES (inductively coupled plasma-atomic emission spectrometry). Adsorption isotherms of Cd(II) onto ZnAl-EDTA were measured at varying initial Cd concentrations (0.05 mg/L to 1 mg/L) under optimized conditions. The data were applied to Langmuir and Freundlich isotherms model, and well fitted by the Freundlich isotherms model. The pseudo-second-order kinetic model was more adequate to describe the kinetic in this case.

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The adsorption of Pb(II) on Mg2Al layered double hydroxide

Cited by 267 publications

References 60 publications

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Synergistic effect of humic and fulvic acids on Ni removal by the calcined Mg/Al layered double hydroxide

Adsorption of Cd(II) on Zn-Al LDHs (Layered Double Hydroxides) Intercalated with Chelating Agents EDTA

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