Modified fly ash as an effect adsorbent for simultaneous removal of heavy metal cations and anions in wastewater

Chen, Pan; Wu, Jianwen; Li, Lü; Yang, Yaohui; Cao, Jian

doi:10.1016/j.apsusc.2023.157165

Cited by 21 publications

(4 citation statements)

References 64 publications

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“…The modified fly ash was prepared according to the method of our previous research [27]. Firstly, the magnetic fly ash was prepared via ferro-salt coprecipitation through ultrasonic stirring of fly ash + ferric salt in a 50 • C water bath device.…”

Section: Experimental Design Of Combined Remediationmentioning

confidence: 99%

Combined Remediation towards Cadmium–Arsenic-Contaminated Soil via Phytoremediation and Stabilization

Zhang,

Wu,

Cao

2023

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Using a phytoremediation technique for soil remediation usually takes many years, which increases the risk that heavy metals spread into the environment during the project period. Currently, the combined remediation technique (phytoremediation and stabilization) is known as the solution to reduce this risk. In this study, the combined remediation of cadmium–arsenic-contaminated soil via phytoremediation and stabilization was studied. The pot experiment was carried out using modified fly ash (MFA) and solid waste material (steel slag (SS): pyrolusite (PY): ferrous sulfide (FS) = 1:2:8) as stabilization materials and Bidens pilosa as the accumulative plant. The characteristics of B. pilosa, including its water content, biomass, root length, plant height, and heavy metal content, were obtained after harvesting, and the reduction rate of the bioavailability of Cd and As and their physico-chemical properties, including the pH, Eh, and Ec values of the soil, were also measured. The remediation effect was evaluated according to the above indexes, and the mechanism of combined remediation was studied through the FTIR, XRD, and XPS analyses. These experiments have shown that adding an appropriate amount of MFA can enhance the absorption of heavy metals by plants in the soil and reduce the bioavailability of heavy metals in contaminated soil. In addition, the mechanism study revealed that Cd2+/Cd(OH)+ was easily adsorbed on Si-OH and MnOOH, while AsO43− was more easily adsorbed on Fe-OH and Al-OH.

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Section: Experimental Design Of Combined Remediationmentioning

confidence: 99%

Combined Remediation towards Cadmium–Arsenic-Contaminated Soil via Phytoremediation and Stabilization

Zhang,

Wu,

Cao

2023

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“…As one of the main industrial solid wastes, the utilization of fly ash resources has attracted the attention of many investigators . Normally, fly ash can be utilized as a cement mixture, , concrete admixture, , paste filling material, , road base material, , low-cost adsorbent, , and zeolite raw material . The carbon content, which is always characterized by the loss-on-ignition (LOI), is critical for the utilization of fly ash in the construction industry; therefore, there is a strict standard for the carbon content in fly ash, and the lower the LOI value, the better the quality of the fly ash. , The standard specification for first-grade fly ash in China limits the LOI values to less than 5%, which limits the utilization of fly ash with high LOI .…”

Section: Introductionmentioning

confidence: 99%

Facile Route for Effective Separation and Full-Scale Recycling of Fly Ash and Unburned Carbon

Duan,

Zhang,

Cao

et al. 2024

ACS Omega

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The synchronous production of high-quality unburned carbon concentrate and cleaned ash from high LOI (loss on ignition) fly ash without yielding secondary solid waste is a dilemma issue. In this study, a viable flotation process with one rougher and two cleaners is developed for simultaneously obtaining carbon concentrate with a yield of 18.00% and an ash content of 17.49% and cleaned ash with a yield of 82.00% and a LOI of 4.63% from fly ash, reaching 84.72% of combustible substance recovery and 80.66% of flotation perfection index. The characteristic analyses of the stage by stage releasing products using laser particle size analysis, XRF, XRD, and SEM−EDS demonstrate that the inevitable factors that lead to a remaining higher ash content in the one-step flotation carbon concentrate are the random entrainment of mineral particles in the size range of 0−20 μm, especially the quasi-colloidal parts within 0−12.5 μm and the weak selective collection of fine-grained conjoined granules in the size range of 0−40 μm. Consequently, at least two cleaning steps are required for the effective separation of unburned carbon and ash. Furthermore, batch flotation test results show that diesel is superior to kerosene in the collection of unburned carbon, with an optimum dosage of 800 g/t; no. 2 oil acts more positively than MIBC for the separation of unburned carbon and ash, with an optimal dosing amount of 600 g/t; the optimum pulp concentration and flotation time are as follows: 100 g/L and 3.5 min for the rougher, 45 g/L and 2 min for the first cleaning, and 30 g/L and 3 min for the second cleaning. This study provides an economically feasible technological solution for the full-scale recovery of high-LOI fly ash in one step and avoids the problem of secondary solid waste that would have been generated in previous studies.

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“…Currently, there is a lack of research on MOF materials for the simultaneous removal of cations and anions from H 2 O 2 solutions. − The primary challenges in this endeavor are multifaceted. , First, it is imperative to devise adsorption sites with divergent affinities, ensuring their synergistic operation without mutual interference . Second, the issue of competitive adsorption arises when cations and anions coexist, potentially leading to a decline in selectivity as they vie for adsorption sites on the MOF surface . Third, there are kinetic constraints observed in the less-than-ideal dynamic performance of MOF materials during the simultaneous adsorption of cations and anions, particularly at low concentrations .…”

Section: Introductionmentioning

confidence: 99%

“…27 Second, the issue of competitive adsorption arises when cations and anions coexist, potentially leading to a decline in selectivity as they vie for adsorption sites on the MOF surface. 28 Third, there are kinetic constraints observed in the less-than-ideal dynamic performance of MOF materials during the simultaneous adsorption of cations and anions, particularly at low concentrations. 29 Consequently, the exploration of MOF materials for the purification of hydrogen peroxide holds paramount significance and intrinsic value in addressing these challenges and advancing the field.…”

Section: Introductionmentioning

confidence: 99%

Defective UiO-66-NH₂ (Zr) for Simultaneous Adsorption of Phosphate and Pb²⁺ for Hydrogen Peroxide Purification

Cai,

Zhang,

Shi

et al. 2024

Inorg. Chem.

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Removal of hetero ions from the hydrogen peroxide solution is a crucial step in purifying electronic-grade H 2 O 2 . Conventional adsorption materials are challenged to meet the need for the simultaneous adsorption of both anions and cations in solvents. UiO-66 (Zr) modified by acetic acid and amino group for simultaneous adsorption of phosphate and Pb 2+ in H 2 O 2 purification was fabricated in this work. The as-prepared defective UiO-66-NH 2 (Zr) demonstrated a significant increase in specific surface area and porosity, along with more exposed sites for phosphate and Pb 2+ adsorption. The adsorption capacity of De-UiO-66-NH 2 for phosphate and Pb 2+ in H 2 O 2 solution was 52.28 mg g −1 and 35.4 mg g −1 , which is 1.19 times and 1.88 times that of unmodified UiO-66 (Zr), respectively. The trace simultaneous adsorption with both 100 ppb phosphate and Pb 2+ showed removal rates of 94.0% and 88.7%, respectively, confirming the practicality of MOF materials in the purification of electronic chemicals. This work highlights the potential of Zr-based MOFs as anionic and cationic simultaneous adsorbents for highly efficient purification of electronic-grade solvents.

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Modified fly ash as an effect adsorbent for simultaneous removal of heavy metal cations and anions in wastewater

Cited by 21 publications

References 64 publications

Combined Remediation towards Cadmium–Arsenic-Contaminated Soil via Phytoremediation and Stabilization

Combined Remediation towards Cadmium–Arsenic-Contaminated Soil via Phytoremediation and Stabilization

Facile Route for Effective Separation and Full-Scale Recycling of Fly Ash and Unburned Carbon

Defective UiO-66-NH₂ (Zr) for Simultaneous Adsorption of Phosphate and Pb²⁺ for Hydrogen Peroxide Purification

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Modified fly ash as an effect adsorbent for simultaneous removal of heavy metal cations and anions in wastewater

Cited by 21 publications

References 64 publications

Combined Remediation towards Cadmium–Arsenic-Contaminated Soil via Phytoremediation and Stabilization

Combined Remediation towards Cadmium–Arsenic-Contaminated Soil via Phytoremediation and Stabilization

Facile Route for Effective Separation and Full-Scale Recycling of Fly Ash and Unburned Carbon

Defective UiO-66-NH2 (Zr) for Simultaneous Adsorption of Phosphate and Pb2+ for Hydrogen Peroxide Purification

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Product

Resources

About

Defective UiO-66-NH₂ (Zr) for Simultaneous Adsorption of Phosphate and Pb²⁺ for Hydrogen Peroxide Purification