Mechanistically understanding adsorption of methyl orange, indigo carmine, and methylene blue onto ionic/nonionic polystyrene adsorbents

Pan, Junyin; Zhou, Lijia; Chen, Haihua; Liu, Xiaohan; Hong, Chenlu; Du, Cuiwei; Pan, Bingjun

doi:10.1016/j.jhazmat.2021.126300

Cited by 54 publications

(16 citation statements)

References 33 publications

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“…Based on the chemical structures shown in Table , MO possesses only one −SO 3 – group, while IC and CR possess two −SO 3 – groups. IC and CR contain a greater negative charge than MO, leading to stronger binding to the positively charged MgFe 2 O 4 –NH 2 nanoadsorbent surface. ,, Additionally, hydrogen bonding plays an important role in IC and CR removal since IC and CR contain primary and secondary amines that offer greater opportunity to form hydrogen bonding with the nanoadsorbent. ,, Consequently, the MgFe 2 O 4 –NH 2 nanoadsorbent efficiently removes anionic dyes, particularly IC and CR, in single-component dye systems. Furthermore, the highest removal efficiencies for these dyes are obtained at pH ∼7; we therefore used this pH in all further studies.…”

Section: Resultsmentioning

confidence: 99%

“…The removal efficiencies for IC (∼95%) and CR (∼98%) in the MO-based binary solutions are high (see Figure 3d) and similar to those in the single-component systems (see Figure 1). Higher removal efficiencies for IC and CR than that for MO are due to stronger electrostatic 25,29,31 and hydrogen-bonding 28,31,35 interactions, as mentioned in Section 3.1.1.…”

Section: Effect Of Initial Solution Ph On Selectivementioning

confidence: 93%

“…25,29,31 Additionally, hydrogen bonding plays an important role in IC and CR removal since IC and CR contain primary and secondary amines that offer greater opportunity to form hydrogen bonding with the nanoadsorbent. 28,31,35 Consequently, the MgFe 2 O 4 −NH 2 nanoadsorbent efficiently removes anionic dyes, particularly IC and In the set of the anionic/neutral binary solution, the color of the IC/NR mixture faded from purple to light yellow (see Figure 2c). The absorption band for CR was not detectable, whereas the NR band decreased after the adsorption process.…”

Section: Effect Of Initial Solution Ph On Selectivementioning

confidence: 99%

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Surface Modification of Magnesium Ferrite Nanoparticles for Selective and Sustainable Remediation of Congo Red

Hoijang

Kunakham

Nonkumwong

et al. 2021

ACS Appl. Nano Mater.

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Surface modification of silica-coated magnesium ferrite nanoparticles (MgFe 2 O 4 @SiO 2 NPs) by 3-aminopropyltriethoxysilane (APTES) shows enhanced selectivity for the removal of Congo Red (CR) from both single and binary aqueous dye solutions. Before coating the surfaces of amine-functionalized magnesium ferrite nanoparticles (MgFe 2 O 4 −NH 2 NPs) with silica, control studies of the adsorption of cationic, neutral, and anionic dyes were performed using both single and binary dye systems. The studies found that the MgFe 2 O 4 −NH 2 nanoadsorbent favors the adsorption of indigo carmine (IC) and CR in single dye solutions (>90% removal efficiencies). However, MgFe 2 O 4 −NH 2 NPs preferentially adsorb CR in binary dye solutions. Interestingly, the selectivity of CR over IC depends on the initial concentration of IC/CR in the IC/CR binary systems. A further enhancement in the selective removal of CR in both single and binary dye solutions was achieved by coating the MgFe 2 O 4 −NH 2 NPs with silica followed by modification with APTES (i.e., APTES-modified MgFe 2 O 4 @SiO 2 NPs). The highly selective adsorption capacity for CR on the APTES-modified MgFe 2 O 4 @SiO 2 nanoadsorbent was attributed to the mixture of polar functional groups (i.e., −OH and −NH 2 ) on the surface of the nanoadsorbent, which facilitates adsorbent−adsorbate interactions such as electrostatic and hydrogen-bonding interactions, which are amplified for CR with its more numerous polar functional groups (i.e., amine, azo, and sulfonate groups). From the results, the APTES-modified MgFe 2 O 4 @SiO 2 nanoadsorbent offers an effective, inexpensive, and reusable/sustainable system for the selective removal and remediation of Congo Red from wastewaters.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Initial Solution Ph On Selectivementioning

confidence: 93%

Section: Effect Of Initial Solution Ph On Selectivementioning

confidence: 99%

See 1 more Smart Citation

Surface Modification of Magnesium Ferrite Nanoparticles for Selective and Sustainable Remediation of Congo Red

Hoijang

Kunakham

Nonkumwong

et al. 2021

ACS Appl. Nano Mater.

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“…This result was in good agreement with the adsorption behaviors of dyes in the single-component dye systems. The higher efficiencies for removal of IC over MO and RhB at pH ∼2 could be attributed to strong electrostatic attractions and hydrogen-bonding interactions, as mentioned for the single-component dye systems. ,, However, no significant differences were observed in the efficiencies for removal of IC from either IC/MO or IC/RhB solutions by the MgFe 2 O 4 /PCysMA and MgFe 2 O 4 @SiO 2 /PCysMA nanoadsorbents, probably due to the low initial concentrations of these binary solutions.…”

Section: Results and Discussionmentioning

confidence: 81%

Magnesium Ferrite/Poly(cysteine methacrylate) Nanocomposites for pH-Tunable Selective Removal and Enhanced Adsorption of Indigo Carmine and Methylene Blue

Kunakham

Hoijang

Nguyen

et al. 2022

Ind. Eng. Chem. Res.

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Magnesium ferrite (MgFe 2 O 4 ) and silica-coated MgFe 2 O 4 nanoparticles were grafted with poly(cysteine methacrylate) (i.e., MgFe 2 O 4 /PCysMA and MgFe 2 O 4 @SiO 2 /PCysMA nanocomposites) to study pH-tunable adsorption and enhanced capacities for the adsorption of anionic indigo carmine (IC) and cationic methylene blue (MB) dyes. Several characterization techniques (i.e., XRD, FTIR, TGA, ζ potential analysis, VSM, FE-SEM, TEM, N 2 adsorption−desorption isotherm, and XPS) indicated successful syntheses of these nanocomposites. The adsorption behaviors of the dyes demonstrated that the PCysMA-modified nanoadsorbents could selectively adsorb either IC or MB from either single-component or binary dye systems if the initial pH of the dye solution was tailored appropriately (i.e., pH ∼2 for IC and pH ∼10 for MB). The selective adsorption of these dyes was proposed by the electrostatic attractions of the nanoadsorbents and the dyes. Adsorption isotherms also showed enhanced capacities of MgFe 2 O 4 and MgFe 2 O 4 @SiO 2 NPs for the adsorption of IC and MB after grafting with PCysMA. Interestingly, the MgFe 2 O 4 @SiO 2 /PCysMA nanoadsorbent provided highly pH-selective adsorption and large increases in the capacities for the adsorption of IC and MB, which were attributed to the amounts of PCysMA grafted onto different magnetic substrates. The coating of silica on the surfaces of magnetic nanoparticles provided a higher amount of 3-methacryloxypropyltrimethoxysilane, promoting the polymerization of CysMA monomer. Recycling tests indicated that high efficiencies (∼80%) for the adsorption of IC and MB by the PCysMA-modified nanoadsorbents were obtained after five adsorption−desorption cycles. These key findings showed that the MgFe 2 O 4 /PCysMA and MgFe 2 O 4 @SiO 2 /PCysMA nanocomposites exhibited excellent pH-tunable adsorption of anionic and cationic dyes, easy magnetic separation, good reusability, and high stability. Specifically, the MgFe 2 O 4 @SiO 2 /PCysMA nanocomposite offers highly pH-selective adsorption and high adsorption capacities for dyes, demonstrating promising and alternative nanoadsorbents for applications in wastewater treatment and sensors.

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“…Owing to this toxic potential, the presence of dyes as pollutants in wastewater can cause significant health issues if they are not adequately treated, leading to severe diseases and disorders. Although several methods of dye removal have been reported, adsorption has been found to be the most effective method, with promising results, including low operational costs, a high treatment speed, and operational stability [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Removal of Methyl Red from Aqueous Solution Using Polyethyleneimine Crosslinked Alginate Beads with Waste Foundry Dust as a Magnetic Material

Kim

Purev

Myung

et al. 2022

IJERPH

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In this study, a cost-effective adsorbent based on sodium alginate (SA) with waste foundry dust (WFD) was fabricated for the removal of methyl red (MR) from aqueous media. However, the utilization of WFD/SA beads to remove anionic dyes (such as MR) from effluents has limitations associated with their functional groups. To improve the adsorption performance, WFD/SA-polyethyleneimine (PEI) beads were formed via PEI crosslinking onto WFD/SA beads, which could be attributed to the formation of amide bonds from the carboxyl and amino groups due to the change of N-H bonds in the reaction. The Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) results indicated that PEI was crosslinked on the WFD/SA via a chemical reaction. In the FTIR spectra of WFD/SA-PEI, peaks of the –COO (asymmetric) stretching vibration shifted to 1598 and 1395 cm−1, which could be attributed to the hydrogen-bonding effect of the N–H groups in PEI. In the N1s spectrum, three deconvoluted peaks were assigned to N in –N= (398.2 eV), –NH/–NH2 (399.6 eV), and NO2 (405.2 eV). WFD/SA-PEI beads were assessed and optimized for aqueous MR adsorption. The WFD/SA-PEI beads showed a high removal efficiency for MR (89.1%) at an initial concentration of 1000 mg/L, and presented a maximum MR adsorption capacity of 672.7 mg/g MR. The adsorption process showed a good fit with the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model. The amino and hydroxyl groups in the WFD/SA-PEI beads facilitate strong hydrogen bonding and electrostatic interactions. Moreover, these WFD/SA-PEI beads were easily recovered after the adsorption process.

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Mechanistically understanding adsorption of methyl orange, indigo carmine, and methylene blue onto ionic/nonionic polystyrene adsorbents

Cited by 54 publications

References 33 publications

Surface Modification of Magnesium Ferrite Nanoparticles for Selective and Sustainable Remediation of Congo Red

Surface Modification of Magnesium Ferrite Nanoparticles for Selective and Sustainable Remediation of Congo Red

Magnesium Ferrite/Poly(cysteine methacrylate) Nanocomposites for pH-Tunable Selective Removal and Enhanced Adsorption of Indigo Carmine and Methylene Blue

Removal of Methyl Red from Aqueous Solution Using Polyethyleneimine Crosslinked Alginate Beads with Waste Foundry Dust as a Magnetic Material

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