Valorization of coal fired-fly ash for potential heavy metal removal from the single and multi-contaminated system

Kumar, Manmohan; Goswami, Lalit; Singh, Ankita; Sikandar, Mohammad

doi:10.1016/j.heliyon.2019.e02562

Cited by 84 publications

(17 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Many researchers have reported that algal cells and may have a very high capacity for binding with metals due to the presence of polysaccharides, proteins, or lipids on the surface of cell walls, possessing the functional groups viz. aminos, hydroxyls, carboxyls and sulfhydryl, which can act as binding sites for metals (Kumar et al, 2019;.…”

Section: Introductionmentioning

confidence: 99%

Biosorption of Hg (II) from aqueous solution using algal biomass: kinetics and isotherm studies

Kumar

Singh

Sikandar

2020

Heliyon

Self Cite

View full text Add to dashboard Cite

The present work investigated the ability of algal biomass Chlorella vulgaris to remove mercury from aqueous solutions. The mercury biosorption process was studied through batch experiments 35 C temperature with regard to the influence of contact time, initial mercury concentration, pH and desorption. The maximum adsorption capacity was registered at pH 6. The adsorption conduct of Hg(II) was defined by pseudo second order well rather pseudo first order as the experimental data (q e ) come to an agreement with the calculated value. The kinetics of adsorption was fast and a high capacity of adsorption occurred within only 90 min. The adsorption data were signified by many models but Langmuir (q max ¼ 42. mg g À1 ) & Freundlich fitted well having regression coefficients near to unity. The thermodynamic parameters were also suited well as negative value of free energy cope up to spontaneity, positive value of the randomness described by ΔS attributed to affinity of Hg þ2 towards algal bioadsorbant and high positive value of heat of enthalpy designates that the adsorption process is expected due to robust interactions between the Hg(II) ions and various functional groups on surface of algal bioadsorbant. Field emission scanning electron microscopy integrated with energy dispersive X-ray spectroscopy analysis before and after adsorption of Hg(II) reveals the adsorption of metallic ions over the surface. FTIR study supported the existence of various functional groups (carboxylix, amines, hydroxyls, amides etc.) helped in adsorption. Continuous adsorption desorption experiments proved that algal cells was excellent biosorbents with potential for further development.

show abstract

Section: Introductionmentioning

confidence: 99%

Biosorption of Hg (II) from aqueous solution using algal biomass: kinetics and isotherm studies

Kumar

Singh

Sikandar

2020

Heliyon

Self Cite

View full text Add to dashboard Cite

show abstract

“…Inyinbor et al., reported a total surface area of 0.0387 m 2 g −1 and 1.8642 m 2 g −1 for adsorption of Rhodamine B dye using agricultural wastes ( Inyinbor et al., 2015 ). Gracilaria edulis has a mean pore diameter of 283.69 nm which corresponding to micropore size (>50 nm) would have been due to the pretreatment of biomass ( Hwang et al., 2018 ; Kumar et al., 2019 ). Adsorbents with such macropore sizes are rarely reported.…”

Section: Resultsmentioning

confidence: 99%

Statistical optimization of textile dye effluent adsorption by Gracilaria edulis using Plackett-Burman design and response surface methodology

Venkataraghavan

Thiruchelvi

Sharmila

2020

Heliyon

View full text Add to dashboard Cite

Statistical optimization models were employed to optimize the adsorption of textile dye effluent onto Gracilaria edulis . Significant factors responsible for adsorption were determined using Plackett-Burman design (PBD) and were time, pH, and dye concentration. Box-Behnken (BB) design was used for further optimization. The predicted and the experimental values were found to be in good agreement, the coefficient of determination value 0.9935 and adjusted coefficient of determination value 0.9818 indicated that the model was significant. The results of predicted response optimization showed that maximum decolorization could be attained with time 131.51 min, pH 7.48, and dye concentration 23.13%. The model was validated experimentally with 92.65% decolorization efficiency. The experiment was confirmed using Fourier transform infrared spectroscopy (FTIR), high-resolution scanning electron microscope coupled with energy dispersive X-ray analysis (HR-SEM-EDX), X-ray diffraction spectrometry (XRD) and Brunauer-Emmett-Teller (BET) surface area and pore size analysis techniques. Desorption studies at various pH (2–14) were performed and a maximum of 23% of the dye was recovered from the adsorbed biomass.

show abstract

“…Generally, depending on the type of procedure used to obtain HAp, the porosimetry parameters of HAp can be diverse (e.g., 12.5-22.9 m 2 /g [71], 26.34-86.15 m 2 /g, and 0.12-0.51 cm 3 /g) [72]. Similarly, depending on its origin, coal fly ash can also have varied parameters (e.g., 12.1 m 2 /g [73], 16.2 m 2 /g and 0.031 cm 3 /g [74], 17.4 m 2 /g [52], 35 m 2 /g and 0.042 cm 3 /g [75], and 39.3 m 2 /g and 0.171 cm 3 /g) [70].…”

Section: Physical-chemical Characteristics Of Cfa-hap Compositesmentioning

confidence: 99%

“…Due to their high free CaO content (dependent on their origin), these ashes are chemical sequestering agents for CO 2 removal [50] and can be used as mineral additives in cement pastes [51]. Fly ash is also recognized as a promising adsorbent for removing heavy metals from multi-component systems [52]. The use of waste byproducts as secondary raw materials for the production of new materials in industrial and environmental applications is an important element of sustainability and the circular economy [53].…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Physical, Chemical, and Adsorption Properties of Coal-Fly-Ash–Hydroxyapatite Composites

et al. 2021

View full text Add to dashboard Cite

(1) Hydroxyapatite (Hap), which can be obtained by several methods, is known to be a good adsorbent. Coal fly ash (CFA) is a commonly reused byproduct also used in environmental applications as an adsorbent. We sought to answer the following question: Can CFA be included in the method of Hap wet synthesis to produce a composite capable of adsorbing both heavy metals and dyes? (2) High calcium lignite CFA from the thermal power plant in Bełchatów (Poland) was used as the base to prepare CFA–Hap composites. Four types designated CFA–Hap1–4 were synthesized via the wet method of in situ precipitation. The synthesis conditions differed in terms of the calcium reactants used, pH, and temperature. We also investigated the equilibrium adsorption of Cu(II) and rhodamine B (RB) on CFA–Hap1–4. The data were fitted using the Langmuir, Freundlich, and Redlich–Peterson models and validated using R2 and χ2/DoF. Surface changes in CFA–Hap2 following Cu(II) and RB adsorption were assessed using SEM, SE, and FT-IR analysis. (3) The obtained composites contained hydroxyapatite (Ca/P 1.67) and aluminosilicates. The mode of Cu(II) and RB adsorption could be explained by the Redlich–Peterson model. The CFA–Hap2 obtained using CFA, Ca(NO3)2, and (NH4)2HPO4 at RT and pH 11 exhibited the highest maximal adsorption capacity: 73.6 mg Cu/g and 87.0 mg RB/g. (4) The clear advantage of chemisorption over physisorption was indicated by the Cu(II)–CFA–Hap system. The RB molecules present in the form of uncharged lactone were favorably adsorbed even on strongly deprotonated CFA–Hap surfaces.

show abstract

Valorization of coal fired-fly ash for potential heavy metal removal from the single and multi-contaminated system

Cited by 84 publications

References 43 publications

Biosorption of Hg (II) from aqueous solution using algal biomass: kinetics and isotherm studies

Biosorption of Hg (II) from aqueous solution using algal biomass: kinetics and isotherm studies

Statistical optimization of textile dye effluent adsorption by Gracilaria edulis using Plackett-Burman design and response surface methodology

Characterization of the Physical, Chemical, and Adsorption Properties of Coal-Fly-Ash–Hydroxyapatite Composites

Contact Info

Product

Resources

About