Adsorptive removal of both cationic and anionic dyes by using sepiolite clay mineral as adsorbent: Experimental and molecular dynamic simulation studies

Largo, Fadwa; Haounati, Redouane; Akhouairi, Siham; Ouachtak, Hassan; Haouti, Rachid El; Guerdaoui, Anouar El; Hafid, Naima; Santos, Diogo M.F.; Akbal, Feryal; Kuleyin, Ayşe; Jada, Amane; Addi, Abdelaziz Aït

doi:10.1016/j.molliq.2020.114247

Cited by 105 publications

(22 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9 Therefore, to make it viable, use of low-cost adsorbents has been prospected for wastewater remediation. 10 Various mineral systems like zeolites, 11 kaolinite, 12 illite-kaolinite, 13 fly ash, 14 halloysite, 15 sepiolite, 16,17 montmorillonite, 18 and clinoptilolite 19 have been used for dye adsorption. The favorable dye adsorption using these minerals is due to their attributes like high surface area and molecular sieve structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature and fly ash content on the catalytically pyrolyzed rice straw biochar–fly ash composites for methylene blue adsorption

Bhardwaj

Nag

Hussain

et al. 2022

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

Rice straw and fly ash are the wastes produced in abundance which need immediate attention for their management. In the present study, the in situ pyrolysis of rice straw in presence of fly ash was carried out and the resultant composites were studied for adsorption of methylene blue (MB). Slow pyrolysis of rice straw in presence of fly ash is evaluated using thermogravimetric analysis (TGA) and Coats-Redfern equation for pseudo-first-order reaction kinetics, respectively. The activation energy (E a ) for the pyrolysis of rice straw was 41.75 kJ/mol which was lowered to 37.39 kJ/mol in presence of fly ash. Biochar fly ash composites BFA4 1-3 , BFA5 1-3 , and BFA6 1-3 were prepared at three 400 C, 500 C, and 600 C pyrolysis temperature, respectively, the subscript indicating three different ratios of rice straw and fly ash (1:3, 1:1, and 3:1 w/w ratio). The composites BF4-6 1-3 were neutral to alkaline in pH, due to the presence of basic oxide and carbonates minerals. BFA4-6 1-3 was studied for batch adsorption of MB and optimized for pH, dose, and initial concentration of adsorbate. The maximum MB adsorption capacity of 25.91 mg/g was reported for the composite BFA4 1 . MB adsorption efficiency (q e ) followed the trend BFA4 1-3 > BFA5 1-3 > BFA6 1-3 , which indicates a strong influence of biochar surface functional groups on dye adsorption, as reiterated by the multiple linear regression (MLR) analysis. Stripping of MB was achieved using methanol as a stripping agent for MB-adsorbed BFA4-6 1-3 with desorption efficiency of 7% to 11% in the first cycle and 23% to 100% in the second cycle.Thus, the biochar fly ash composite with optimum ion exchangeable functional organic moieties would be suitable for dye remediation and waste generated in the process could find application in soil amelioration. K E Y W O R D S adsorption-desorption, composite biochar, dye, thermogravimetric analysis Akanksha Bhardwaj and Shilpa Nag have equal contributions to the paper.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of temperature and fly ash content on the catalytically pyrolyzed rice straw biochar–fly ash composites for methylene blue adsorption

Bhardwaj

Nag

Hussain

et al. 2022

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

show abstract

“…The H2S and SO2 molecules exhibited a ring-like structures in the tunnel. The stability of the adsorption was evaluated by the diffusion coefficients of the gas molecules, and the results are shown in Table 2( Zhou et al, 2016;Largo et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

Study of the adsorption mechanisms of NH₃, H₂S and SO₂ on sepiolite using molecular dynamics simulations

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The 1024 cm −1 band corresponds to the Si-O-Si vibrations, and the one at 450 cm −1 to the Si-O-Mg link, and, at 653 cm −1 , there is the bending vibration of Mg-OH. Sepiolite impurities derived from dolomite are also detected at 1443 cm −1 [54,55]. Comparing the bands between the spectra of the raw sepiolite with the ones after exposure to the desorbing solvent, for both leaching steps, no substantial differences were detected (the 1443 cm −1 band from dolomite is the one that does not appear).…”

Section: Characterization Of the Adsorbents/biosorbentsmentioning

confidence: 95%

Cleaner Approach for Atrazine Removal Using Recycling Biowaste/Waste in Permeable Barriers

Lago¹,

Silva²,

Tavares³

2021

Recycling

View full text Add to dashboard Cite

This work addresses the rehabilitation of water contaminated with atrazine, entrapping it in a permeable and sustainable barrier designed with waste materials (sepiolite) and with biomaterials (cork and pine bark). Atrazine adsorption was assessed by kinetics and equilibrium assays and desorption was tested with different extraction solvents. Adsorbed atrazine was 100% recovered from sepiolite using 20% acetonitrile solution, while 40% acetonitrile was needed to leach it from cork (98%) and pine bark (94%). Continuous fixed-bed experiments using those sorbents as PRB were performed to evaluate atrazine removal for up-scale applications. The modified dose-response model properly described the breakthrough data. The highest adsorption capacity was achieved by sepiolite (23.3 (±0.8) mg/g), followed by pine bark (14.8 (±0.6) mg/g) and cork (13.0 (±0.9) mg/g). Recyclability of sorbents was evaluated by adsorption-desorption cycles. After two regenerations, sepiolite achieved 81% of atrazine removal, followed by pine with 78% and cork with 54%. Sepiolite had the best performance in terms of adsorption capacity/stability. SEM and FTIR analyses confirmed no significant differences in material morphology and structure. This study demonstrates that recycling waste/biowaste is a sustainable option for wastewater treatment, with waste valorization and environmental protection.

show abstract

Adsorptive removal of both cationic and anionic dyes by using sepiolite clay mineral as adsorbent: Experimental and molecular dynamic simulation studies

Cited by 105 publications

References 61 publications

Effect of temperature and fly ash content on the catalytically pyrolyzed rice straw biochar–fly ash composites for methylene blue adsorption

Effect of temperature and fly ash content on the catalytically pyrolyzed rice straw biochar–fly ash composites for methylene blue adsorption

Study of the adsorption mechanisms of NH₃, H₂S and SO₂ on sepiolite using molecular dynamics simulations

Cleaner Approach for Atrazine Removal Using Recycling Biowaste/Waste in Permeable Barriers

Contact Info

Product

Resources

About

Adsorptive removal of both cationic and anionic dyes by using sepiolite clay mineral as adsorbent: Experimental and molecular dynamic simulation studies

Cited by 105 publications

References 61 publications

Effect of temperature and fly ash content on the catalytically pyrolyzed rice straw biochar–fly ash composites for methylene blue adsorption

Effect of temperature and fly ash content on the catalytically pyrolyzed rice straw biochar–fly ash composites for methylene blue adsorption

Study of the adsorption mechanisms of NH3, H2S and SO2 on sepiolite using molecular dynamics simulations

Cleaner Approach for Atrazine Removal Using Recycling Biowaste/Waste in Permeable Barriers

Contact Info

Product

Resources

About

Study of the adsorption mechanisms of NH₃, H₂S and SO₂ on sepiolite using molecular dynamics simulations