Improved removal of Cr(VI) from aqueous solution using zeolite synthesized from coal fly ash via mechano‐chemical treatment

Wang, W.X.; Qiao, Yu; Li, Tingan; Liu, S.; Zhou, Ji; Yao, Hong; Yang, Huaizhou; Xu, Minghou

doi:10.1002/apj.2069

Cited by 19 publications

(3 citation statements)

References 49 publications

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“…is important to develop techniques for the utilization of CFA and several have been proposed in this category [5][6][7][8][9]. CFA has been used directly for soil remediation [10][11][12][13], embankments or building [14][15][16], as adsorbent for waste and contaminant handling, gas separation and capture and mineral recovery [17][18][19][20][21][22][23][24][25][26][27], as catalyst or catalyst support [9,28], etc. Furthermore, it is of more economic significance to develop eco-friendly techniques that convert CFA to value-added products.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of zeolites Na-A and Na-X from tablet compressed and calcinated coal fly ash

Hu¹,

Gao²,

Liu³

et al. 2017

R. Soc. open sci.

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Zeolites Na-A and Na-X are important synthetic zeolites widely used for separation and adsorption in industry. It is of great significance to develop energy-efficient routines that can synthesize zeolites Na-A and Na-X from low-cost raw materials. Coal fly ash (CFA) is the major residue from the combustion of coal and biomass containing more than 85% SiO2 and Al2O3, which can readily replace the conventionally used sodium silicate and aluminate for zeolite synthesis. We used Na2CO3 to replace the expensive NaOH used for the calcination of CFA and showed that tablet compression can enhance the contact with Na2CO3 for the activation of CFA through calcination for the synthesis of zeolites Na-A and Na-X under mild conditions. We optimized the control variables for zeolite synthesis and showed that phase-pure zeolite Na-A can be synthesized with CFA at reactant molar ratio, hydrothermal reaction temperature and reaction time of 1.3Na2O: 0.6Al2O3: 1SiO2: 38H2O at 80°C for 6 h, respectively, while phase-pure zeolite Na-X can be synthesized at 2.2Na2O: 0.2Al2O3: 1SiO2: 88H2O at 100°C for 8 h, respectively. The composition, morphology, specific surface area, vibration spectrum and thermogravimetry of synthesized Na-A and Na-X were further characterized.

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Section: Introductionmentioning

confidence: 99%

Synthesis of zeolites Na-A and Na-X from tablet compressed and calcinated coal fly ash

Hu¹,

Gao²,

Liu³

et al. 2017

R. Soc. open sci.

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show abstract

“…To do so, leaching concentration test following Toxicity Characteristic Leaching Procedure (TCLP EPA 1311) was conducted before the synthesis of zeolite to measure the leaching concentrations of five common heavy metals, Cr, Pb, Cu, Zn and Cd. The basic properties of the coal fly ash and the analysis and discussion on the Na-X type and properties of synthesized zeolite have been reported in our previous study, in which the zeolite used is the same as in this work (Wang et al, 2017). These properties, including chemical compositions, Brunauer-Emmett-Teller (BET) surface area, typical heavy metals, mineral phases and morphology and the Fourier transform infrared spectra of the coal fly ash and the synthesized, are also presented in the Supplemental Material.…”

Section: Methodsmentioning

confidence: 96%

Application of zeolite synthesized from coal fly ash via wet milling as a sustainable resource on lead(II) removal

et al. 2023

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In this work, zeolite based on coal fly ash was firstly synthesized via wet milling for the adsorption of lead (Pb(II)). The effects of contact time, solid-to-liquid ratio and initial pH of solution on Pb(II) removal were investigated in detail. The experimental data showed that synthesized zeolite has high adsorption capacity of 99.082 mg of Pb(II) per gram of adsorbent. Coal fly ash zeolite synthesized by wet milling has good Pb(II) adsorption performance when the initial pH of the solution is above 5. The adsorption kinetic results demonstrated that removal of Pb(II) via the synthesized zeolite followed pseudo-second-order kinetic model. X-ray photoelectron spectroscopy results directly demonstrated the adsorption between Pb(II) and synthesized zeolite, and a possible reaction pathway was proposed. Specifically, the removing mechanism of Pb(II) from aqueous solution via the synthesized zeolite involves two stages: one is that Pb(II) in aqueous solution is absorbed on the interior of the synthesized zeolite, and the other is chemical precipitation.

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“…Among these methods, adsorption holds the significant position due to its high removal efficiency, low energy demand, and less chemical investment [11][12][13]. In the past years, researchers have applied various adsorbents to remove Cr(VI) from waste water, such as activated carbons [14], zeolites [15,16], clays [17], and nanomagnetic particles [18]. However, these adsorbents have many defects including low porosity, low surface area, and lack of functional groups [19], which is of great importance for an efficient adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Well-Dispersed Nanoscale Zero-Valent Iron Supported in Macroporous Silica Foams: Synthesis, Characterization, and Performance in Cr(VI) Removal

Zhao

Yang

Wang

2017

Journal of Materials

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Well-dispersed nanoscale zero-valent iron (NZVI) supported inside the pores of macroporous silica foams (MOSF) composites (Mx-NZVI) has been prepared as the Cr(VI) adsorbent by simply impregnating the MOSF matrix with ferric chloride, followed by the chemical reduction with NaHB 4 in aqueous solution at ambient atmosphere. Through the support of MOSF, the reactivity and stability of NZVI are greatly improved. Transmission electron microscopy (TEM) results show that NZVI particles are spatially well-dispersed with a typical core-shell structure and supported inside MOSF matrix. The N 2 adsorption-desorption isotherms demonstrate that the Mx-NZVI composites can maintain the macroporous structure of MOSF and exhibit a considerable high surface area (503 m 2 ⋅g −1 ). X-ray photoelectron spectroscopy (XPS) and powder X-ray diffraction (XRD) measurements confirm the core-shell structure of iron nanoparticles composed of a metallic Fe 0 core and an Fe(II)/Fe(III) species shell. Batch experiments reveal that the removal efficiency of Cr(VI) can reach 100% when the solution contains 15.0 mg⋅L −1 of Cr(VI) at room temperature. In addition, the solution pH and the composites dosage can affect the removal efficiency of Cr(VI). The Langmuir isotherm is applicable to describe the removal process. The kinetic studies demonstrate that the removal of Cr(VI) is consistent with pseudosecond-order kinetic model.

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Improved removal of Cr(VI) from aqueous solution using zeolite synthesized from coal fly ash via mechano‐chemical treatment

Cited by 19 publications

References 49 publications

Synthesis of zeolites Na-A and Na-X from tablet compressed and calcinated coal fly ash

Synthesis of zeolites Na-A and Na-X from tablet compressed and calcinated coal fly ash

Application of zeolite synthesized from coal fly ash via wet milling as a sustainable resource on lead(II) removal

Well-Dispersed Nanoscale Zero-Valent Iron Supported in Macroporous Silica Foams: Synthesis, Characterization, and Performance in Cr(VI) Removal

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