Sorption of Pb2+ on mercapto functionalized sepiolite

Liang, Xuefeng; Yue, Xu; Wang, Lin; Sun, Yuebing; Lin, Daohui; Sun, Yuhan; Qin, Xu; Wan, Qian

doi:10.1016/j.chemosphere.2012.08.027

Cited by 70 publications

(29 citation statements)

References 63 publications

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“…Compared with activated carbons and artificial adsorbents, the cost of sepiolite is much lower, about US$ 0.04-0.07/kg. Sepiolite has been studied as an effective and economical sorbent material for wastewater treatment, including the removal of dyes and pigments [10][11][12][13][14][15][16][17], the adsorption of surfactants [18], the adsorption of pesticides [19], and the removal of heavy metal ions [1,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Removal of tungsten from electroplating wastewater by acid- and heat-treated sepiolite

Wang

Chen

et al. 2014

Desalination and Water Treatment

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In this study, the removal of tungsten from electroplating wastewater by adsorption on sepiolite has been investigated. To improve its performance, the natural sepiolite, was treated using H 2 SO 4 , followed by a heat treatment. The results obtained from the adsorption experiments showed that the acid-and heat-treated sepiolite had much higher adsorption for tungsten compared to the untreated (natural) sepiolite. The pH and temperature were important parameters in the adsorption process: the tungsten adsorption onto the acid-and heat-treated sepiolite increased at a lower pH and higher temperature, and the maximum adsorption capacity of 48.3 mg/g was obtained at pH 4.0, 55˚C, initial concentration of tungsten of 300 mg/L, and the sepiolite to liquid ratio of 0.5 g/100 mL. The acid-and heattreated sepiolite was applied to electroplating industrial wastewater containing 265 mg/L tungsten, under the conditions of pH ≤ 6, 25-55˚C, more than 98% of tungsten was removed. It was concluded that the acid-and heat-treated sepiolite is a potential adsorbent that can be commercially used to remove the residual tungsten in industrial wastewater.

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Section: Introductionmentioning

confidence: 99%

Removal of tungsten from electroplating wastewater by acid- and heat-treated sepiolite

Wang

Chen

et al. 2014

Desalination and Water Treatment

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“…However, if the plot deviates from linearity, then the boundary layer diffusion (film diffusion) controls the sorption process. In addition, if the data show multilinear plots, then a combination of diffusion and adsorption controls the process of sorption (Boparai et al 2011;Liang et al 2013). As shown in Fig.…”

Section: Mechanism Of Sorptionmentioning

confidence: 99%

“…Although there are several reports about the adsorption characteristics of sepiolites from different regions of the world (Shirvani et al 2006;Kocaoba 2009;Lazarevic et al 2012), little information is available about the Iranian counterparts. Besides, most of the previous studies were carried out using synthetic solutions rather than a real wastewater (Babel and Kurniawan 2004;Shirvani et al 2006;Kocaoba 2009;Lazarevic et al 2012;Liang et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Kinetics and thermodynamics of zinc removal from a metal-plating wastewater by adsorption onto an Iranian sepiolite

Hojati

Landi

2014

Int. J. Environ. Sci. Technol.

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The study of the kinetics and thermodynamics of the adsorption process can provide valuable information for the proper design and control of adsorption systems. The influence of temperature on the kinetics of Zn 2?sorption on an Iranian sepiolite sample was investigated through a series of batch experiments. Consistent with an exothermic reaction, an increase in the temperature resulted in decreasing Zn 2? adsorption rate. The sorption kinetics was tested for pseudo-first-order, pseudo-secondorder, and intraparticle diffusion models, and the rate constants were calculated. Results showed that the adsorption kinetics followed the pseudo-second-order kinetic model. The intraparticle diffusion model described that sorption of Zn onto the sepiolite particles is a two-step process, and intraparticle diffusion is not the only ratelimiting step. The results obtained from the study of thermodynamic data indicated that sorption of Zn onto sepiolite is non-spontaneous and less favored at higher temperatures.

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“…The higher energy peaks at 143.95 eV for Pb/MIL-101 and 143.69 eV for Pb/ED-MIL-101(5 mmol) can correspond to Pb 4f 5/2 , and the lower energy peaks at 138.90 eV for Pb/MIL-101 and 138.84 eV for Pb/ED-MIL-101(5 mmol) are located at Pb 4f 7/2 . 41 According to the literature, 42 in Figure 6f, the lower energy peak locates at 399.90 eV (N1) corresponding to the −NH 2 , N2 (400.69 eV) due to the chelation of −NH 2 group for Pb(II) ions, which helps to explain why ED-MIL-101(5 mmol) has more excellent adsorption capacity than MIL-101. 3.1.5.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive Removal of Pb(II) Ions from Aqueous Samples with Amino-Functionalization of Metal–Organic Frameworks MIL-101(Cr)

2015

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Metal organic frameworks (MOFs) have been regarded as robust adsorbents for the adsorptive removal of organic pollutants because of their unique characteristics. However, the application of MOFs in the removal of metals from water is still rare. In this paper, amino-functionalization of Cr-based MOFs MIL-101 are modified through coordination bonding of unsaturated Cr metal centers with the −NH 2 group in ethylenediamine (ED), and we demonstrate their excellent performance for the removal of Pb(II) ions from water. The Fourier transform infrared verifies that the ethylenediamine was grafted successfully on MIL-101. Furthermore, the results of X-ray diffraction, scanning electron microscopy, and transmission electron microscopy show that the structure of ED-MIL-101 with an appropriate amount of ED almost does not collapse and retains the original performance of MIL-101. The adsorption capacity of ED-MIL-101, which is more than five times that of MIL-101, is 81.09 mg·g −1 for Pb(II) ions from aqueous samples. The selectivity coefficients of ED-MIL-101 for Pb(II)/Cu(II), Pb(II)/ Zn(II), Pb(II)/Co(II), and Pb(II)/Ni(II) are 6.92, 24.02, 15.69, and 14.53, respectively. The adsorption kinetics of Pb(II) ions shows that the process fits well with a pseudo-second-order model, and the adsorption equilibrium time is only about 30 min. Moreover, the practical application of ED-MIL-101 achieves almost 97.22% removal efficiency for Pb(II) ions. These results indicate that ED-MIL-101 has great potential in selectively removing Pb(II) ions from water environment.

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Sorption of Pb2+ on mercapto functionalized sepiolite

Cited by 70 publications

References 63 publications

Removal of tungsten from electroplating wastewater by acid- and heat-treated sepiolite

Removal of tungsten from electroplating wastewater by acid- and heat-treated sepiolite

Kinetics and thermodynamics of zinc removal from a metal-plating wastewater by adsorption onto an Iranian sepiolite

Adsorptive Removal of Pb(II) Ions from Aqueous Samples with Amino-Functionalization of Metal–Organic Frameworks MIL-101(Cr)

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