Pb(II) ion adsorption by biomass-based carbonaceous fiber modified by the integrated oxidation and vulcanization

Jiang, Xiaoxiang

doi:10.1007/s11814-017-0162-6

Cited by 9 publications

(3 citation statements)

References 56 publications

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“…Similar patterns can be observed for the three Pd@CN catalysts. The peak at 23.8° is attributed to the C (002) plane, and the diffraction peaks at 40.1°, 46.6°, and 68.0° are clear, which can be ascribed to the Pd (111), (200), and (220) planes (JCPDS card code 65–6174), respectively . However, the peak intensity is slightly different.…”

Section: Resultsmentioning

confidence: 99%

Selective catalytic hydrogenation of phenol to cyclohexanone over Pd@CN: Role of CN precursor separation mode

Zhang

Jiang

et al. 2018

Can J Chem Eng

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The one-step hydrogenation of phenol to cyclohexanone is green and sustainable. In this study, the effect of a CN (N-doped carbon) precursor separation mode on the catalytic performance of a Pd@CN catalyst for selective hydrogenation of phenol to cyclohexanone in water was investigated. Three modes, i.e., rotary evaporation, centrifugation, and filtration, were designed to separate the CN precursor while preparing the Pd@CN catalyst. The results highlight that the separation mode significantly affects the phenol hydrogenation performance of the Pd@CN catalyst. The best catalytic performance is obtained when separating the CN precursor by the rotary evaporation mode. Based on a series of characterizations, it is confirmed that the separation mode of rotary evaporation can introduce more N into the mesoporous carbon, improve the Pd dispersion, and enhance the basic sites and Pd loading, leading to higher catalytic activity. Furthermore, the Pd@CN catalyst prepared by rotary evaporation exhibits better catalytic stability. Less Pd leaching is responsible for its slight deactivation. These findings can provide a point of reference for the development of Pd@CN catalysts with high catalytic performance.

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Section: Resultsmentioning

confidence: 99%

Selective catalytic hydrogenation of phenol to cyclohexanone over Pd@CN: Role of CN precursor separation mode

Zhang

Jiang

et al. 2018

Can J Chem Eng

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“…With regards to the potential roles of functional groups in heavy metals adsorption process 120 , 121 , less diversity of the groups on the surface of C. glaucum shells compared to the other two biosorbents probably contributes to the lower adsorption capacity of this adsorbent (Table 7 ). In this regard, it should be noted that, the findings of several related studies investigating the role of functional groups in the adsorption of Pb(II) ions by various adsorbents indicate that among the diverse identified functional groups present on the adsorbents surface, the hydroxyl, amine, sulfonate and carboxyl groups play a significant role 122 – 127 . The peak shifts of the mentioned functional groups were also observed in the biosorbents studied in the present research, especially for the fish scales (Table 7 ), which confirms the higher adsorption potential of lead ions by these adsorbents compare to the bivalve shells.…”

Section: Discussionmentioning

confidence: 99%

Removal of lead from aqueous solutions using three biosorbents of aquatic origin with the emphasis on the affective factors

Rezaei

Pourang

Moradi

2022

Sci Rep

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The biosorptive potentials of three aquatics-based biosorbents, including shells of a bivalve mollusk and scales of two fish species for Pb removal from aqueous solutions were evaluated, for the first time. A Box–Behnken design with the response surface methodology was used to investigate the effects of the seven important variables (contact time, temperature, initial concentration, dosage, size, salinity and pH) on the sorption capacity of the sorbents. Among the seven studied factors, the effects of biosorbent dosage, initial concentration and pH were significant for all the response variables, while biosorbent size was not significant for any of the responses. The initial concentration was the most influential factor. The presence of Pb ions on the surfaces of the biosorbents after the adsorption was clearly confirmed by the SEM–EDX and XRF analyses. The maximum sorption capacities of the biosorbents were comparable to the literature and the descending order was as follows: scales of Rutilus kutum and Oncorhynchus mykiss and the shells of Cerastoderma glaucum. The isotherm studies revealed Langmuir model applicability for the Pb adsorption by R. kutum and O. mykiss scales, while Freundlich model was fitted to the adsorption C. glaucum shells.

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“…The modification of ceramite is referred to the improvement of Jiang's method. 14 Ceramsite powder (40 g) was stirred with 200 mL of nitric acid (.5, 1, 2.5, or 5 M) at 298 ± .5 K and 300 rpm for 24 h. Filtered and rinsed the acid-treated powder with deionized water until the pH of leachate reached 6. The rinsed powder was dried at 378 K for 48 h to obtain the nitric acid-modified ceramsite (NC) powders.…”

Section: Preparation Of Modified Ceramsitementioning

confidence: 99%

Study on the Pb(II) adsorption mechanism on acid‐modified ceramsite made from sewage sludge and industrial solid wastes

Feng,

Li,

et al. 2024

Int J Applied Ceramic Tech

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Ceramsite was made from sludge, phosphogypsum, and red mud and then modified with different concentrations of hydrochloric, nitric, or citric acid. The resulting composite ceramsite was subsequently utilized for the adsorption of Pb(II). The maximum adsorption capacities of hydrochloric acid– and nitric acid–modified ceramsites were 90.38 and 88.57 mg/g, respectively, which were much higher than those of unmodified ceramsite (66.86 mg/g) and citric acid–modified ceramsite (57.85 mg/g). The variation of isoelectric point, acidic and basic groups, and Fourier transform infrared spectra of ceramsite were compared before and after adsorption. A decrease of isoelectric point implied weakening of electrostatic repulsion between Pb(II) and the modified ceramsite. Functional groups, such as O─H, C═O (or C═C), and Si─O─Si (or Al─O─Al), were involved in the adsorption. In addition, phenol hydroxyl, which exhibited a significant increase in modified ceramsite and a noticeable decrease after adsorption, was the most important group. Besides, the modified ceramsite had larger specific surface areas and pores (30.66 g/m2, .11256 cm3/g), more functional groups, and lower isoelectric points (8.57), which were favorable for adsorption. The adsorption processes described by pseudo‐second‐order kinetics were controlled by chemical adsorptions. Isothermal studies indicated that monolayer adsorption occurred on hydrochloric acid–modified ceramsite and multiple processes occurred on nitric acid– and citric acid–modified ceramsites. Thermodynamic analysis confirmed Pb(II) adsorption on modified ceramsite was spontaneous and endothermic.

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Pb(II) ion adsorption by biomass-based carbonaceous fiber modified by the integrated oxidation and vulcanization

Cited by 9 publications

References 56 publications

Selective catalytic hydrogenation of phenol to cyclohexanone over Pd@CN: Role of CN precursor separation mode

Selective catalytic hydrogenation of phenol to cyclohexanone over Pd@CN: Role of CN precursor separation mode

Removal of lead from aqueous solutions using three biosorbents of aquatic origin with the emphasis on the affective factors

Study on the Pb(II) adsorption mechanism on acid‐modified ceramsite made from sewage sludge and industrial solid wastes

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