Sorption of Cu2+, Cd2+, and Pb2+ using modified zeolite from coal fly ash

Apiratikul, Ronbanchob; Pavasant, Prasert

doi:10.1016/j.cej.2008.01.038

Cited by 177 publications

(86 citation statements)

References 37 publications

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“…Therefore, in theory, heavy metal sorption must increase with increasing zeolite concentration. In addition, heavy metal sorption rates increase at high zeolite concentration since it reduces the competition between metal ions due to the availability of more sorption sites [52,66,71,72]. However, high zeolite concentration increases the pH of the system, which successively affects the removal of heavy metals as discussed in Subsection 3.2.1.…”

Section: Zeolite Concentrationmentioning

confidence: 99%

Influence of Physical and Chemical Parameters on the Treatment of Heavy Metals in Polluted Stormwater Using Zeolite—A Review

Ziyath¹,

Mahbub²,

Goonetilleke³

et al. 2011

JWARP

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Zeolite-based technology can provide a cost effective solution for stormwater treatment for the removal of toxic heavy metals under increasing demand of safe water from alternative sources. This paper reviews the currently available knowledge relating to the effect of properties of zeolites such as pore size, surface area and Si:Al ratio and the physico-chemical conditions of the system such as pH, temperature, initial metal concentration and zeolite concentration on heavy metal removal performance. The primary aims are, to consolidate available knowledge and identify knowledge gaps. It was established that an in-depth understanding of operational issues such as, diffusion of metal ions into the zeolite pore structure, pore clogging, zeolite surface coverage by particulates in stormwater as well as the effect of pH on stormwater quality in the presence of zeolites is essential for developing a zeolite-based technology for the treatment of polluted stormwater. The optimum zeolite concentration to treat typical volumes of stormwater and initial heavy metal concentrations in stormwater should also be considered as operational issues in this regard. Additionally, leaching of aluminium and sodium ions from the zeolite structure to solution were identified as key issues requiring further research in the effort to develop cost effective solutions for the removal of heavy metals from stormwater.

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Section: Zeolite Concentrationmentioning

confidence: 99%

Influence of Physical and Chemical Parameters on the Treatment of Heavy Metals in Polluted Stormwater Using Zeolite—A Review

Ziyath¹,

Mahbub²,

Goonetilleke³

et al. 2011

JWARP

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“…Therefore, tourmaline has a good adsorption capacity for high concentrations of Cd(II) under acidic, neutral and alkaline conditions. Specifically, the removal capacity for Cd(II) was higher under strongly acidic pH values (in contrast to industrial wastewater pH values) compared to that obtained for other types of adsorbents that have been used in the past, such as zeolites [2,23], quartz [3], calcite [24], dolomite [25], kaolinite [26], and different types of clays [27].…”

Section: Ph Effectsmentioning

confidence: 99%

“…As shown in [2,23], quartz [3], calcite [24], dolomite [25], kaolinite [26], and different types of clays [27] was made. The removal capacities for Cd(II) using tourmaline in the present study were compared to those of other natural adsorbents, as shown in Table 3.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…In recent years, many natural adsorbents have been investigated for removing heavy metals from water. Different types of minerals, including zeolites [2], quartz [3], apatites [4], goethite [5], calcite [6], and dolomite [7] have been successfully utilized collectively and separately to remove heavy metal ions from aqueous solutions using adsorption techniques. However, when the above sorbents were used to remove heavy metals from acidic solutions, their maximum adsorption capacity was very low.…”

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confidence: 99%

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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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“…However, the adsorption capacity of CFA is not very high. Several authors have reported the conversion of coal fly ash into zeolite and used it to reduce heavy metal and dye concentrations from aqueous solutions [1,5,6,7,8]. Zeolite is regarded as an effective but expensive adsorbent due to its high cost of manufacturing.…”

Section: Introductionmentioning

confidence: 99%

The character of dual site adsorbent on coal fly ash toward Pb (II) adsorption

Astuti¹

2013

IOSRJEN

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-Coal fly ash (CFA), generated during combustion of coal in the electricity production is recognized as an environmental pollutant. CFA is composed primarily of some oxides including SiO 2 , Al 2 O 3 having active site and unburned carbon that anables it to act as a dual site adsorbent. However, the existence of unburned carbon in coal fly ash can generate two possibilities. It can improve the adsorption capacity, or contradictionly hinder the adsorption.The aim of this paper is to study the contribution of unburned carbon on coal fly ash toward characters, adsorption capacity and adsorption mechanism. In this context, CFA with various unburned carbon content were employed as adsorbent of Pb(II) in aqueous solutions. The research shows that the existence of unburned carbon in CFA leads to the increase of specific surface area and pore size, but the adsorption capacity for Pb(II) decrease. Adsorption kinetics of Pb(II) onto CFA could be approximated with a pseudo second order kinetic model with the rate constant was 0.298 g.mg -1 .min -1 .

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Sorption of Cu2+, Cd2+, and Pb2+ using modified zeolite from coal fly ash

Cited by 177 publications

References 37 publications

Influence of Physical and Chemical Parameters on the Treatment of Heavy Metals in Polluted Stormwater Using Zeolite—A Review

Influence of Physical and Chemical Parameters on the Treatment of Heavy Metals in Polluted Stormwater Using Zeolite—A Review

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

The character of dual site adsorbent on coal fly ash toward Pb (II) adsorption

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