Adsorption of Cu(II), Cd(II), Zn(II), Mn(II) and Fe(III) ions by tannic acid immobilised activated carbon

Üçer, Asiye; Uyanık, Ahmet; Aygün, S. Fatma

doi:10.1016/j.seppur.2005.06.012

Cited by 325 publications

(77 citation statements)

References 20 publications

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“…The selectivity of adsorption was found by Meena [16] to decrease in the order: Cd > Cu > Hg > Ni > Pb, whereas the adsorption capacities order, determined by Kardivelu et al [18], follow the trend Hg > Pb > Cd. Similar differences were also observed during absorption of heavy metals onto activated carbons by different authors [40][41][42][48][49][50]. Some consider that metal ions go through adsorption sites easily when the ionic diameter becomes small [40,41,48,50].…”

Section: Adsorption Isothermssupporting

confidence: 68%

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Removal of lead(II), copper(II), cobalt(II) and nickel(II) ions from aqueous solutions using carbon gels

Osińska

2016

J Sol-Gel Sci Technol

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The carbon gel and carbon gel doped with 0.5, 1 and 2 wt% of graphite intercalation compound were used for the removal of heavy metals from aqueous solutions. These materials were prepared by a sol-gel process that involves a polycondensation of resorcinol and formaldehyde. Nitrogen adsorption, scanning electron microscopy, energy dispersive spectroscopy and fourier transform infrared spectroscopy were used for a morpho-structural adsorbent investigation. In the present paper, Cu, Co, Pb and Ni ions adsorption experiments were carried out in batch conditions under magnetic stirring. The effect of some parameters such as contact time, metal ions' concentration and pH were examined. Adsorption data on all sorbents, followed both the Frendlich and Langmuir models. The data better fitted the Langmuir isotherm than the Frendlich one. The highest degree of removal was achieved for Pb ions at the initial concentration of 10 mg/l and for 2 g/l adsorbent dose. Adsorption results expressed as adsorption capacities showed that carbon gel doped with 2 wt% of graphite intercalation compound is the best adsorbent. Graphical Abstract Keywords Carbon gels• Pb(II)• Cu(II)• Co(II) and Ni(II) ions• Adsorption of heavy metal ions • Graphite intercalation compound

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Section: Adsorption Isothermssupporting

confidence: 68%

“…Total content of surface oxide groups for composites with 1 and 2 % addition of GIC is about two times higher than for sample CG. The importance of the effect of acid functional groups on the adsorption capacity for heavy metal ions has been reported by many researchers [40][41][42][43]. …”

Section: Physicochemical Characteristicsmentioning

confidence: 99%

Removal of lead(II), copper(II), cobalt(II) and nickel(II) ions from aqueous solutions using carbon gels

Osińska

2016

J Sol-Gel Sci Technol

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“…The peak located at 1462 cm -1 could be attributed to carbonyl groups [19]. The absorptions at 1384 cm -1 were associated with symmetric COO -stretching [2,20,21]. These produced functional groups abundantly on the external and internal surfaces of acidified functionalized MWCNTs, which can provide numerous chemical sorption sites and thus increase the ion exchange capacity for the metal ion, in other words, the hydrophilic properties of these functional groups improve the dispersity of MWCNTs in aqueous solution.…”

Section: Resultsmentioning

confidence: 99%

Functionalization of acidified multi-walled carbon nanotubes for removal of heavy metals in aqueous solutions

et al. 2017

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Water pollution is a worldwide issue for the ecoenvironment and human society. Removal of various pollutants including heavy metals from the environment is a big challenge. Techniques of adsorption are usually simple and work effectively. In the current study, MWCNTs were prepared by chemical vapor deposition (CVD) of acetylene at 600°C. Fe-Co/CaCO 3 catalyst/support was prepared by wet impregnation method. The crystal size of the catalyst was identified using XRD. Acidified functionalized multiwalled carbon nanotubes (MWCNT) were produced from oxidation of multi-walled carbon nanotubes by mixture of H 2 O 2 ? HNO 3 in a ratio of 1:3 (v/v) at 25°C. The structure and purity of synthesized functionalized CNTs were examined by TEM, N 2 -BET method and thermogravimetric analysis. The functional groups produced at CNTs surface were investigated using FTIR spectroscopy.

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“…Furthermore, the ζ-potential of the Cd(II) adsorbed by tourmaline became less negative than that of tourmaline in water (Figure 2(b)), which indicates that the tourmaline surfaces were covered with heavy metal ions. In this pH range, it was proposed that the ion exchange and electropolar adsorption processes are the major mechanisms for removing single metal ions from the solution [28]. At pH values greater than 6.0, the ζ-potentials of the tourmaline adsorbed Cd(II) became slightly negative.…”

Section: Ph Effectsmentioning

confidence: 99%

“…At pH values greater than 6.0, the ζ-potentials of the tourmaline adsorbed Cd(II) became slightly negative. It was suggested that both ion exchange and aqueous metal hydroxide formation (not precipitation) may become significant mechanisms for the metal removal process [28].…”

Section: Ph Effectsmentioning

confidence: 99%

Adsorption of Cd(II) from acidic aqueous solutions by tourmaline as a novel material

Wang

Liu

et al. 2012

Chin. Sci. Bull.

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Batch experiments were conducted to investigate the behavior and mechanisms for the adsorption of Cd(II) from aqueous solutions by tourmaline under acidic conditions. The results indicated that the adsorption of Cd(II) significantly depend on the adsorption time, temperature, and the initial concentration of the metal ion. Furthermore, tourmaline had a very good adsorption capacity for Cd(II) in acidic, neutral and alkaline aqueous solutions. This good adsorption capacity is attributed to the observation that tourmaline can automatically adjust the pH values of acidic (except pH 2.0 and 3.0), neutral or alkaline aqueous solutions to 6.4. Specifically, the removal capacity for Cd(II) was higher at strongly acidic pH values (in contrast to industrial wastewater pH values) compared to that obtained for other types of adsorbents. Furthermore, the results obtained in this study showed good fits to the Langmuir and Freundlich adsorption isotherms. However, the Langmuir model fit better than the Freundlich model. The maximum uptake of Cd(II) by tourmaline was 31.77, 33.11 and 40.16 mg/g at pH 4.0 at 15, 25 and 35°C, respectively. Therefore, tourmaline is an effective adsorbent for the removal of Cd(II) from acidic aqueous solutions. In addition, the kinetics for the Cd(II) adsorption by tourmaline closely followed the pseudo-second-order model. The thermodynamic parameters indicated that adsorption was feasible, spontaneous, and endothermic. Furthermore, the pH variation after adsorption, ζ-potential, metal ions desorbed and released, and FT-IR analysis indicated that the physisorption and chemisorption mechanisms of tourmaline for heavy metals. These mechanisms included water that was automatically polarized by tourmaline, the ion exchange process, and electropolar adsorption. Among the mechanisms, the automatic polarization of water caused by tourmaline is a unique adsorption mechanism for tourmaline. tourmaline, cadmium, acidic aqueous solutions, adsorption, mechanisms Citation:Wang C P, Wang B L, Liu J T, et al. Adsorption of Cd(II) from acidic aqueous solutions by tourmaline as a novel material. Chin Sci Bull, 2012Bull, , 57: 32183225, doi: 10.1007 With the increase in industrialization and urbanization, wastewater containing many heavy metals has been produced by electroplating, dyes, and the metallurgical and chemical industries. Furthermore, heavy metal pollution has become increasingly serious. Heavy metals have a negative impact on the environment because they are toxic to humans, animals, and plants, and they are not biodegradable. Therefore, heavy metals are prone to bioaccumulation in food chains, which results in a long-term toxic effect, even at low concentrations. Cadmium is one of the most dangerous heavy metals because of its presence in nature. Most of the cadmium that enters the body accumulates in the liver, kidney, pancreas and bones, which causes diseases such as anemia, hypertension, neuralgia, nephritis and secretion disorder [1]. Developing methods for effectively removing heavy metals from...

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Adsorption of Cu(II), Cd(II), Zn(II), Mn(II) and Fe(III) ions by tannic acid immobilised activated carbon

Cited by 325 publications

References 20 publications

Removal of lead(II), copper(II), cobalt(II) and nickel(II) ions from aqueous solutions using carbon gels

Removal of lead(II), copper(II), cobalt(II) and nickel(II) ions from aqueous solutions using carbon gels

Functionalization of acidified multi-walled carbon nanotubes for removal of heavy metals in aqueous solutions

Adsorption of Cd(II) from acidic aqueous solutions by tourmaline as a novel material

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