Selective removal of Cr(VI) by tannic acid and polyethyleneimine modified zero-valent iron particles with air stability

Wang, Meng; Chen, Yingbo; Zhang, Yuanyuan; Zhao, Ke; Feng, Xianshe

doi:10.1016/j.jhazmat.2023.132018

Cited by 29 publications

(5 citation statements)

References 73 publications

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“…Specifically, the C 1s spectra of the pristine PVDF can be divided into three peaks corresponding to CF 2 , CH 2 , and C−C/C−H, at 290.63, 286.20, and 285.05 eV, respectively. 20 For TSP-0, in addition to the original three peaks, a new peak appeared at 288.78 eV, 31 decreased by 10.3 nm, further demonstrating the ultrathin thickness of the polyionic nanogel and ensuring the ultrahigh water flux of the TSP-3 membrane. As shown in Figure 4h, the zeta potential of the TSP-0 membrane was −9.16 mV at pH 3, which may be related to the presence of carboxyl groups after grafting acrylic acid.…”

Section: Resultsmentioning

confidence: 88%

“…As shown in Figure c, the overall peak shapes of C 1s spectra of pristine PVDF, TSP-0, and TSP-3 changed significantly. Specifically, the C 1s spectra of the pristine PVDF can be divided into three peaks corresponding to CF 2 , CH 2 , and C–C/C–H, at 290.63, 286.20, and 285.05 eV, respectively . For TSP-0, in addition to the original three peaks, a new peak appeared at 288.78 eV, which can be attributed to O–CO, indicating that the PAA was successfully grafted onto the At-PVDF.…”

Section: Resultsmentioning

confidence: 96%

“…18 Kong et al 19 grafted an amino-terminated hyperbranched polymer onto the surface of graphene oxide, enhancing its adsorption capacity and recoverability for Cr(VI). Wang et al 20 developed a composite adsorbent for Cr(VI) removal by immobilizing PEI on the surface of zerovalent iron particles. Most of the reported materials for the removal of Cr(VI) are particulate adsorbents, which are not favorable for subsequent byproduct recovery.…”

Section: Introductionmentioning

confidence: 99%

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Ultrathin and Metal Ions-Free Polyionic Nanogel Coating Membrane for Efficient and Fast Oil-in-Water Emulsions Separation and Cr(VI) Removal: Adsorption Properties, Kinetics, and Mechanism

Luo,

Zheng,

Long

et al. 2024

Ind. Eng. Chem. Res.

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The problem of oil fouling and the complex composition of oily wastewater are bottlenecks that urgently need to be addressed for the application of membrane separation technology in the field of oil−water separation. Therefore, ultrathin TA/SA/PEI polyionic nanogel coatings were constructed on hydrophobic PVDF membrane surfaces through surface grafting and dopamine-like self-polymerization reactions. The functional coated membranes (TSP-3) retain superhydrophilicity and underwater superoleophobicity, even in harsh environments such as strong acids, strong alkalis, various salt solutions, ultrasound, and abrasion. The TSP-3 membrane exhibited excellent separation efficiency (>99%) for a wide range of oil-in-water emulsions stabilized by surfactants, with virtually no deterioration in flux (>8014.70 ± 298.86 L•m −2 •h −1 •bar −1 ) over five dead-end cycle separations. The formation process of the oil film filter cake was also analyzed in crossflow mode. It was assumed that the accumulation of oil droplets on the membrane surface to form a film under certain conditions was beneficial to the membrane's antioil fouling performance. Meanwhile, the TSP-3 membrane possessed high removal efficiency (96.13%) and recoverability for Cr(VI), and the phenolic hydroxyl groups could also reduce Cr(VI) to the lower toxicity Cr(III). Various adsorption kinetic and isotherm models were used to analyze the adsorption process, and the results fit well with the pseudo-second-order kinetic model (R 2 = 0.99820) and the Langmuir model (R 2 = 0.99986). This indicated that the adsorption of Cr(VI) by TSP-3 was monomolecular layer chemical adsorption on heterogeneous surfaces, and the adsorption was favorable (0 < R L < 1). Electrostatic attraction and hydrogen bonding were considered to play a key role in the adsorption of Cr(VI) by XPS characterization analysis and DFT theoretical calculations. This strategy provided a feasible approach for constructing ultrathin polyanionic nanogel membranes to achieve an antioil barrier, which could effectively and rapidly separate a wide range of oil-in-water emulsions stabilized by surfactants, while removing and reducing Cr(VI).

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Ultrathin and Metal Ions-Free Polyionic Nanogel Coating Membrane for Efficient and Fast Oil-in-Water Emulsions Separation and Cr(VI) Removal: Adsorption Properties, Kinetics, and Mechanism

Luo,

Zheng,

Long

et al. 2024

Ind. Eng. Chem. Res.

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“…The Freundlich model, on the other hand, is based on the idea that different surfaces adsorb different substances differently. It says that as active sites get more occupied, binding strength decreases [46]. Based on Figure 5, it is clear that the Langmuir model better describes how the molecules stick to LCN, showing that it happens on a flat, single-layer surface.…”

Section: Effect Of Concentration and Adsorption Isothermmentioning

confidence: 95%

Nitric Acid-Treated Blue Coke-Based Activated Carbon’s Structural Characteristics and Its Application in Hexavalent Chromium-Containing Wastewater Treatment

Wang,

Luoyang

et al. 2023

Molecules

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This study primarily focused on the efficient transformation of low-priced blue coke powder into a high-capacity adsorbent and aimed to address the pollution issue of hexavalent chromium (Cr (VI))-laden wastewater and to facilitate the effective utilization of blue coke powder. A two-step method was utilized to fabricate a blue coke-based nitric acid-modified material (LCN), and the impact of nitric acid modification on the material’s structure and its efficacy in treating Cr (VI)-contaminated wastewater was evaluated. Our experimental results illustrated that, under identical conditions, LCN exhibited superior performance for Cr (VI) treatment compared to the method employing only potassium hydroxide (LCK). The specific surface area and pore volume of LCN were 1.39 and 1.36 times greater than those of LCK, respectively. Further chemical composition analysis revealed that the functional group structure on the LCN surface was more conducive to Cr (VI) adsorption. The highest amount of Cr (VI) that LCN could bind was measured at 181.962 mg/g at 318 K. This was mostly due to chemisorption, which is dominated by redox reactions. The Cr (VI) removal process by LCN was identified to be a spontaneous, exothermic, and entropy-increasing process. Several tests on recycling and reuse showed that LCN is a stable and effective chromium-containing wastewater adsorbent, showing that it could be used in many situations.

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“…Tannic acid, a plant polyphenol, is readily present in all aerial plant tissues. In the past, tannic acid was utilized to address diarrhoea and skin burns, and also administered rectally to treat unspecified rectal disorders 12 – 14 . The challenge of extracting tannic acid from a reaction after it has been used is overcome by its interaction with heterogeneous nanoparticles 15 – 22 .…”

Section: Introductionmentioning

confidence: 99%

Preparation of nanodiamond anchored on copper tannic acid as a heterogenous catalyst for synthesis of 1,4-benzodiazepines derivatives

Ghalavand,

Ghafuri,

Ardeshiri

2024

Sci Rep

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In this research, a new and eco-friendly heterogeneous catalyst (ND@Tannicacid-Cu) was synthesized based on nanodiamond and copper tannic acid via esterification process. The as-prepared catalyst was characterized by Fourier transforms infrared spectroscopy (FT-IR), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and X-ray diffraction (XRD) methods. The catalytic efficacy of the intended catalyst was examined by one-step three-component reaction of 1,4-benzodiazepine derivatives from a mixture of ortho-phenylenediamine, aromatic aldehydes, and dimedone under mild conditions. In all instances, corresponding 2,4-benzodiazepines derivatives were synthesized with high efficiency, short reaction time, straightforward work up procedure, no requirement for column-chromatography, and cost-effective catalyst. The heterogeneous catalyst was easily recycled using fillers, and it can be reused for eight cycles without significantly diminishing its performance.

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Selective removal of Cr(VI) by tannic acid and polyethyleneimine modified zero-valent iron particles with air stability

Cited by 29 publications

References 73 publications

Ultrathin and Metal Ions-Free Polyionic Nanogel Coating Membrane for Efficient and Fast Oil-in-Water Emulsions Separation and Cr(VI) Removal: Adsorption Properties, Kinetics, and Mechanism

Ultrathin and Metal Ions-Free Polyionic Nanogel Coating Membrane for Efficient and Fast Oil-in-Water Emulsions Separation and Cr(VI) Removal: Adsorption Properties, Kinetics, and Mechanism

Nitric Acid-Treated Blue Coke-Based Activated Carbon’s Structural Characteristics and Its Application in Hexavalent Chromium-Containing Wastewater Treatment

Preparation of nanodiamond anchored on copper tannic acid as a heterogenous catalyst for synthesis of 1,4-benzodiazepines derivatives

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