3D ZnO modified biochar-based hydrogels for removing U(VI) in aqueous solution

Guo, Yu; Liu, Xiaoyang; Xie, Shuguang; Liu, Haiyan; Wang, Chenxu; Wang, Lingzhi

doi:10.1016/j.colsurfa.2022.128606

Cited by 24 publications

(14 citation statements)

References 57 publications

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“…Meanwhile, a new peak ascribed to U 4f appears in the PZSC/ZnO‐U XPS pattern in Figure 12A. The peaks of U 4f 5/2 and U 4f 7/2 appear at 393.2 and 382.4 eV, respectively, suggesting the successful combination of PZSC/ZnO with uranyl ions 45 …”

Section: Resultsmentioning

confidence: 96%

“…Table 5 presents the detailed adsorption data of carbon materials/oxide‐containing ceramic composites. The adsorbents listed in Table 6 revealed that the PZSC/ZnO ceramic composite is a prominent adsorbent compared with ZBCG (239.2 mg/g), 45 MOF‐2@Al 2 O 3 (300.3 mg/g), 53 Fe 3 O 4 @TiO 2 (313.6 mg/g), 54 ZnO/PSBM (82.80 mg/g), 55 and AP–ZnO/PSBM (139.8 mg/g) 55 . This investigation indicates that the PZSC/ZnO ceramic composite can be used as a potential adsorbent during the treatment of wastewater containing U(VI).…”

Section: Resultsmentioning

confidence: 99%

“…Comparison of adsorption data of PZSC/ZnO and other adsorbents with ZBCG (239.2 mg/g), 45 MOF-2@Al 2 O 3 (300.3 mg/g), 53 Fe 3 O 4 @TiO 2 (313.6 mg/g), 54 ZnO/PSBM (82.80 mg/g), 55 and AP-ZnO/PSBM (139.8 mg/g). 55 This investigation indicates that the PZSC/ZnO ceramic composite can be used as a potential adsorbent during the treatment of wastewater containing U(VI).…”

Section: 13mentioning

confidence: 99%

“…The peaks of U 4f 5/2 and U 4f 7/2 appear at 393.2 and 382.4 eV, respectively, suggesting the successful combination of PZSC/ZnO with uranyl ions. 45 The XPS patterns of PZSC/ZnO and PZSC/ZnO-U are analyzed in Figure 12A-F and recorded in Table 5. In the P 2p spectrum of the composite, the binding energy of the P-O bond at 133.5 eV increases, indicating that P may participate in the adsorption process through the O sites owing to the introduction of ZnO.…”

Section: Possible Adsorption Mechanismsmentioning

confidence: 99%

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Enhanced adsorption behavior of U(VI) using PZSC/ZnO ceramic composite derived from polyphosphazene

et al. 2022

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In this study, a new type of ceramic composite (PZSC/ZnO) was successfully synthesized using N, P, and S co-doped carbon microspheres derived from polyphosphazene with zinc oxide. The morphology and structure were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive spectroscopy, Raman, X-ray diffraction, BET, and thermogravimetric. Batch experiments were used to explore the adsorption performance under different pH values, initial concentrations, contact times, and temperatures. The results showed that the maximum adsorption capacity of the PZSC/ZnO ceramic composite for uranium was 470.5 mg/g (pH = 5.5, t = 40 min, and T = 25 • C). The adsorption process followed the nonlinear Langmuir model and the pseudo-second-order kinetic model, demonstrating that the monolayered combination of U(VI) with the PZSC/ZnO ceramic composite and the adsorption mechanism was chemical adsorption. Thermodynamic data revealed that the adsorption was a spontaneous endothermic process. Furthermore, P and N may be involved in the adsorption of uranyl ions through binding to the O atoms from ZnO. The main forces between U(VI) and the PZSC/ZnO ceramic composite were attributed to ZnO and heteroatoms doped in the material.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: 13mentioning

confidence: 99%

Section: Possible Adsorption Mechanismsmentioning

confidence: 99%

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Enhanced adsorption behavior of U(VI) using PZSC/ZnO ceramic composite derived from polyphosphazene

et al. 2022

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“…The doping of iron or iron oxides could enhance the reduction ability and adsorption capacity of biochar, and thereby increase the elimination of metal ions from solutions. Guo et al (2022) synthesized 3D ZnO modified biochar and applied it for U(VI) removal. The adsorption capacity reached 239 mg/g at pH = 5 with high adsorptiondesorption cycles and high stability.…”

Section: Fe-based Biocharmentioning

confidence: 99%

Application of biochar-based photocatalysts for adsorption-(photo)degradation/reduction of environmental contaminants: mechanism, challenges and perspective

Cai

Zhang

et al. 2022

Biochar

158

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The fast increase of population results in the quick development of industry and agriculture. Large amounts of contaminants such as metal ions and organic contaminants are released into the natural environment, posing a risk to human health and causing environment ecosystem problems. The efficient elimination of contaminants from aqueous solutions, photocatalytic degradation of organic pollutants or the in-situ solidification/immobilization of heavy metal ions in solid phases are the most suitable strategies to decontaminate the pollution. Biochar and biochar-based composites have attracted multidisciplinary interests especially in environmental pollution management because of their porous structures, large amounts of functional groups, high adsorption capacities and photocatalysis performance. In this review, the application of biochar and biochar-based composites as adsorbents and/or catalysts for the adsorption of different contaminants, adsorption-photodegradation of organic pollutants, and adsorption-(photo)reduction of metal ions are summarized, and the mechanism was discussed from advanced spectroscopy analysis and DFT calculation in detail. The doping of metal or metal oxides is the main strategy to narrow the band gap, to increase the generation and separation of photogenerated e−-h+ pairs, to produce more superoxide radicals (·O2−) and hydroxyl radicals (·OH), to enhance the visible light absorption and to increase photocatalysis performance, which dominate the photocatalytic degradation of organic pollutants and (photo)reduction of high valent metals to low valent metals. The biochar-based composites are environmentally friendly materials, which are promising candidates in environmental pollution cleanup. The challenge and perspective for biochar-based catalysts are provided in the end. Graphical Abstract

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Biochar-Based Hydrogel Nanocomposites: An Innovative Technique for Contaminant-Free Environment

Borgohain

Baruah

Sarmah

et al. 2023

Advances in Science, Technology &Amp; Innovation

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3D ZnO modified biochar-based hydrogels for removing U(VI) in aqueous solution

Cited by 24 publications

References 57 publications

Enhanced adsorption behavior of U(VI) using PZSC/ZnO ceramic composite derived from polyphosphazene

Enhanced adsorption behavior of U(VI) using PZSC/ZnO ceramic composite derived from polyphosphazene

Application of biochar-based photocatalysts for adsorption-(photo)degradation/reduction of environmental contaminants: mechanism, challenges and perspective

Biochar-Based Hydrogel Nanocomposites: An Innovative Technique for Contaminant-Free Environment

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