Potential of removing Cd(II) and Pb(II) from contaminated water using a newly modified fly ash

Huang, Xunrong; Zhao, Hanghang; Zhang, Guibin; Li, Jingtian; Yang, Yang; Ji, Puhui

doi:10.1016/j.chemosphere.2019.125148

Cited by 100 publications

(34 citation statements)

References 57 publications

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“…The presence of different pollutants in water that are characterized by their non-biodegradable nature can affect the environment and humans' health [1][2][3]. Due to pollutants, heavy metals occur in a significant number of places; this type of pollutant represents one of the biggest environmental problems [4,5].…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Materials Obtained by Fly Ash Sulphuric Activation for Cadmium Ions Removal

et al. 2020

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Wastes are the sustainable sources of raw materials for the synthesis of new adsorbent materials. This study has as objectives the advanced capitalization of fly ash, by sulphuric acid activation methods, and testing of synthesized materials for heavy metals removal. Based on the previous studies, the synthesis parameters were 1/3 s/L ratio, 80 °C temperature and 10% diluted sulphuric acid, which permitted the synthesis of an eco-friendly adsorbent. The prepared adsorbent was characterized through SEM, EDX, FTIR, XRD and BET methods. Adsorption studies were carried out for the removal of Cd2+ ions, recognized as ions dangerous for the environment. The effects of adsorbent dose, contact time and metal ion concentrations were studied. The data were tested in terms of Langmuir and Freundlich isotherm and it was found that the Langmuir isotherm fitted the adsorption with a maximum adsorption capacity of 28.09 mg/g. Kinetic data were evaluated with the pseudo-first-order model, the pseudo-second-order model and the intraparticle diffusion model. The kinetics of cadmium adsorption into eco-friendly material was described with the pseudo-second-order model, which indicated the chemisorption mechanism.

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Section: Introductionmentioning

confidence: 99%

Eco-Friendly Materials Obtained by Fly Ash Sulphuric Activation for Cadmium Ions Removal

et al. 2020

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“…Because of their toxicity, persistence and non-degradation, heavy metals tend to accumulate in living organisms; this poses a serious threat to the living organisms and human health and gradually affects the entire ecosystem. 1,2 The removal of Pb(II) from wastewater has become an urgent problem in environmental protection. Therefore, the development of scientic and effective methods to deal with the wastewater polluted by Pb(II) has become a research hotspot.…”

Section: Introductionmentioning

confidence: 99%

The effects of different factors on the removal mechanism of Pb(ii) by biochar-supported carbon nanotube composites

Yang

Sun

et al. 2020

RSC Adv.

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“…The measurement of main surface charge properties was performed by determining the isoelectric point (IEP), the point of zero charge (PZC), and the (negative) charge density of each adsorbent, noting that the IEP determination requires the plotting of the corresponding zeta-potential curve. For this purpose, 50 mg/L suspension of finely powdered adsorbent was dispersed in an electrolyte solution (0.01 M NaNO 3 ) and this was equilibrated at various pH values (3)(4)(5)(6)(7)(8)(9)(10), by adding either HNO 3 or NaOH dilute solutions (see Figure S2). The electrophoretic velocity of charged particles was determined by a Rank Brothers Micro-electrophoresis Apparatus Mk II (Rank Brothers, Cambridge, UK).…”

Section: Characterizationmentioning

confidence: 99%

“…The choice of an appropriate adsorbent type for the specific needs of water treatment is crucial. The major categories of examined adsorbents for the removal of heavy metals can be mainly categorized into: organic-based [7,8], inorganic [9], agricultural by-products [10], and ion-exchange resins [11]. Unfortunately, most studies have evaluated the efficiency of adsorbents by calculating the maximum adsorption capacity values (Q max ), which can only be obtained when applying considerably high initial concentrations of the examined pollutants (usually in the order of several mg/L).…”

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confidence: 99%

“…It is worth noting that this approach practically results in most cases to residual concentrations that are significantly exceeding the respective DWRLs [4]. Consequently, the majority of relevant publications overlook the need to evaluate the efficiency of adsorbents by succeeding residual concentrations (C e ) efficiently below the current DWRLs, and to estimate their removal capacity at C e = DWRL (denoted as Q DWRL value) within a natural water matrix [7][8][9][10][11][12][13].…”

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confidence: 99%

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Improvement of Manganese Feroxyhyte’s Surface Charge with Exchangeable Ca Ions to Maximize Cd and Pb Uptake from Water

Kokkinos

Chousein

Simeonidis³

et al. 2020

Materials

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The surface configuration of tetravalent manganese feroxyhyte (TMFx) was appropriately modified to achieve higher negative surface charge density and, hence, to improve its efficiency for the removal of dissolved Cd and Pb mostly cationic species from water at pH values commonly found in surface or ground waters. This was succeeded by the favorable engagement of Ca 2+ cations onto the surface of a mixed Mn-Fe oxy-hydroxide adsorbent during the preparation step, imitating an ion-exchange mechanism between H + and Ca 2+ ; therefore, the number of available negatively-charged adsorption sites was increased. Particularly, the calcium coverage can increase the deprotonated surface oxygen atoms, which can act as adsorption centers, as well as maintain them during the subsequent drying procedure. The developed Ca-modified adsorbent (denoted as TMFx-Ca) showed around 10% increase of negative surface charge density, reaching 2.0 mmol [H + ]/g and enabling higher adsorption capacities for both Cd and Pb aquatic species, as was proved also by carrying out specific rapid small-scale column tests, and it complied with the corresponding strict drinking water regulation limits. The adsorption capacity values were found 6.8 µg·Cd/mg and 35.0 µg·Pb/mg, when the restructured TMFx-Ca adsorbent was used, i.e., higher than those recorded for the unmodified material.

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Potential of removing Cd(II) and Pb(II) from contaminated water using a newly modified fly ash

Cited by 100 publications

References 57 publications

Eco-Friendly Materials Obtained by Fly Ash Sulphuric Activation for Cadmium Ions Removal

Eco-Friendly Materials Obtained by Fly Ash Sulphuric Activation for Cadmium Ions Removal

The effects of different factors on the removal mechanism of Pb(ii) by biochar-supported carbon nanotube composites

Improvement of Manganese Feroxyhyte’s Surface Charge with Exchangeable Ca Ions to Maximize Cd and Pb Uptake from Water

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