Ultra-high adsorption of cationic methylene blue on two dimensional titanate nanosheets

Yuan, Huiyu; Ma, Sainan; Wang, Xin Yu; Liu, Hui; Zhao, Xinhua; Yang, Daoguo; Lo, Wai Hung; Tsang, Yuen Hong

doi:10.1039/c8ra10172h

Cited by 12 publications

(8 citation statements)

References 43 publications

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“…7 (a–f). At the beginning, the spectra showed two strong MB peaks with the maximum absorption at ~ 668 nm and a small shoulder at ~ 620 nm that was ascribed to the characteristic bands of MB monomers and dimers in solution, respectively (Yuan et al 2019 ). In agreement with the low BET area, no MB adsorption happened on the SS-SO 4 , but the dye adsorbed on the AC quickly.…”

Section: Resultsmentioning

confidence: 99%

“…For the SSS, SS-Cl, and SS-NO 3 , both monomer and dimer bands decreased during the test, while a broad band below 609 nm appeared. This band can be considered an indication of MB molecular aggregation on the samples surface, which can be assigned to the trimer structures (Horváth et al 2014 ; Karaca et al 2008 ; Yuan et al 2019 ). To understand this behavior better, the adsorption spectra were fitted by the peaks corresponding to each MB form (monomer, dimer, and trimer) as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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High-capacity adsorbents from stainless steel slag for the control of dye pollutants in water

Plaza

Castellote

Nevshupa

et al. 2021

Environ Sci Pollut Res

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Adsorbent materials for the control of dye pollutants in water were synthetized from stainless steel slag (SSS) using different acid-base treatments. Using HCl (SS-Cl) and HNO3 (SS-NO3) produced high-capacity adsorbents, with BET areas of 232 m2/g and 110 m2/g respectively. Specifically, the SS-Cl had a structure of amorphous silica sponge. Treatment with H2SO4 (SS-SO4) did not enhance the adsorption capabilities with respect to the raw sample (SSS). Activated carbon (AC) was also tested as reference. The materials were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), N2 adsorption-desorption isotherms, scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) zeta potential, and infrared spectroscopy (FTIR). Batch adsorption experiments with methylene blue (MB) showed that the maximum sorption capacities were 9.35 mg/g and 8.97 mg/g for SS-Cl and SS-NO3 at 240 h, respectively. These values, even at slower rate, were close to the adsorption capacity of the AC (9.72 mg/g). This behavior has been attributed to the high porosity in the range of nanopores (0.6–300 nm) and the high-surface area for both samples. Preferential involvement of certain functional groups in the adsorption of dye ions on their surface indicative of chemisorption has been found. Although optimization, repeatability, and reproducibility of the process and environmental assessment have to be done before practical applications, these preliminary results indicate that application of these cost-effective adsorbents from raw SSS may be used in water pollution treatment and contribute to the sustainable development of the steel manufacturing industry.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High-capacity adsorbents from stainless steel slag for the control of dye pollutants in water

Plaza

Castellote

Nevshupa

et al. 2021

Environ Sci Pollut Res

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“…The endothermic adsorption, as reflected by the positive Δ H o value of 36.5 kJ mol –1 (Table ), also supports the process as chemsorption . The ultrahigh adsorption capacity for Pb(II) removal may be attributed to the multilayer dye molecule adsorption behavior The points of zero charge (pH PZC values) of resin 4 were determined by the pH drift method .…”

Section: Resultsmentioning

confidence: 64%

“…62 The ultrahigh adsorption capacity for Pb(II) removal may be attributed to the multilayer dye molecule adsorption behavior. 63 The points of zero charge (pH PZC values) of resin 4 were determined by the pH drift method. 64 CO 2 − -free deionized water was prepared by bubbling N 2 through it at 90 °C for 15 min.…”

Section: Mechanism Of Adsorptionmentioning

confidence: 99%

Design and Synthesis of a Dual-Purpose Superadsorbent Containing a High Density of Chelating Motifs for the Fast Mitigation of Methylene Blue and Pb(II)

et al. 2020

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Maleic acid underwent alternate copolymerization with diallylaminomethylphosphonic acid•HCl [(CH 2  CHCH 2 ) 2 NH + CH 2 PO 3 H 2 Cl − ] and a cross-linker to give a new pH-responsive resin. Methylene blue (MB) removal from its 3000 ppm solution by the resin at pH 7 followed second-order kinetics with an E a of 34.8 kJ mol −1 . MB removal was achieved very fast (10 min), attaining over 98.5% at 328 K. The q e obtained using MB concentrations in the range 100−8000 ppm fitted the Langmuir nonlinear isotherm model to give ΔG o , ΔH o , and ΔS o values of ≈ −21 kJ, 36.5 kJ mol −1 , and 185 J mol −1 K −1 , respectively. The resin is a superadsorbent with a q max value of 2445 mg g −1 . The adsorbent also removed 97% Pb(II) within 5 min from its 10 000 ppb solution. The resin reduced the Pb(II) concentration from 200 to 3.8 ppb. The resin also demonstrated its ability to remove contaminants from industrial wastewater, reducing priority metal contaminants to ppb and sub-ppb levels. The resin can be recycled with stable efficiency. The outstanding performance places the resin in a top position in a list of recently reported sorbents.

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“…42 Formation of multilayer dye molecule may account for the ultra-high adsorption capacity, q MB. 43 …”

Section: Resultsmentioning

confidence: 99%

A sorbent containing pH-responsive chelating residues of aspartic and maleic acids for mitigation of toxic metal ions, cationic, and anionic dyes

et al. 2022

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Ultra-high adsorption of cationic methylene blue on two dimensional titanate nanosheets

Abstract: 2D titanate nanosheets show ultra-high adsorption for methylene blue.

Cited by 12 publications

References 43 publications

High-capacity adsorbents from stainless steel slag for the control of dye pollutants in water

High-capacity adsorbents from stainless steel slag for the control of dye pollutants in water

Design and Synthesis of a Dual-Purpose Superadsorbent Containing a High Density of Chelating Motifs for the Fast Mitigation of Methylene Blue and Pb(II)

A sorbent containing pH-responsive chelating residues of aspartic and maleic acids for mitigation of toxic metal ions, cationic, and anionic dyes

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