Adsorptive recovery of palladium(<scp>ii</scp>) from aqueous solution onto cross-linked chitosan/montmorillonite membrane

Liu, Jian; Zheng, Liuchun; Li, Yaowei; Free, Michael L.; Yang, Ming

doi:10.1039/c6ra06731j

Cited by 38 publications

(9 citation statements)

References 37 publications

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“…However, when mesp-CTS (or macp-CTS) was grafted to cobalt porphyrin, the peak shifted to 398.1 eV. This finding was indicative of axial coordination of lone-pair electrons from the H2Nunit to the Co ion in Co TPPS [46]. The BEs shown in shown in Table 2 correspond well with those in previous reports [47][48][49][50][51][52][53].…”

Section: Characterization For the Co Tpps/mesp-cts Materialssupporting

confidence: 88%

Effect of Mesoporous Chitosan Action and Coordination on the Catalytic Activity of Mesoporous Chitosan-Grafted Cobalt Tetrakis(p-Sulfophenyl)Porphyrin for Ethylbenzene Oxidation

Huang

Wei

et al. 2018

Catalysts

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To simulate the active site cavity structure function and axial coordination of cytochrome P-450 enzymes, mesoporous chitosan(mesp-CTS) was used as a scaffold for a meso-sized cavity to immobilize cobalt tetrakis(p-sulphophenyl)porphyrin chloride(Co TPPS). Immobilization was achieved via an acid-base reaction and axial coordination of the H 2 N-C group to the Co ion in Co TPPS, thus forming the biomimetic catalyst Co TPPS/mesp-CTS. Several approaches, including scanning electron microscopy (SEM), the Brunauer-Emmett-Teller (BET)technique, Fourier transform infrared (FT-IR) spectroscopy, ultraviolet-visible (UV-vis) spectroscopy, thermogravimetric and differential scanning calorimetry (TG-DSC), and X-ray photoelectron spectroscopy (XPS), were used to characterize the grafted catalyst. The catalytic performance of Co TPPS/mesp-CTS in ethylbenzene oxidation without any solvents and additives was investigated. The results showed that only 0.96 × 10 mol of Co TPPS grafted onto mesp-CTS could be recycled three times for 200 mL of ethylbenzene oxidation, with an average yield of 44.6% and selectivity of 68.8%. The highly efficient catalysis can be attributed to promotion by mesp-CTS, including the effect of the mesoporous structure and the axial coordination to the Co ion in Co TPPS. This biomimetic methodology provides a method for clean production of acetophenone via ethylbenzene oxidation.

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Section: Characterization For the Co Tpps/mesp-cts Materialssupporting

confidence: 88%

Effect of Mesoporous Chitosan Action and Coordination on the Catalytic Activity of Mesoporous Chitosan-Grafted Cobalt Tetrakis(p-Sulfophenyl)Porphyrin for Ethylbenzene Oxidation

Huang

Wei

et al. 2018

Catalysts

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“…After covalently bonding and axially coordinating of Mn TPFPP to mCS, the binding energies (BEs) of all elements, especially those of the C, N, Cl and Mn, were changed in different degrees ( Fig. 4 and Table 3) [44][45][46] . The C 1 s binding energy (BE) for the C=C-Funit in Mn TPFPP was changed from 287.0 eV to 284.8 eV for that of Mn TPFPP/mCS.…”

Section: Resultsmentioning

confidence: 99%

“…Infrared (IR) spectra were measured on an iS50 Nicolet spectrophotometer with a resolution of 4 cm −140-43 . X-ray photoelectron spectroscopy (XPS) was performed on a Kratos Ultra Axis DLD spectrometer with the Al K α as an exciting source at 40 eV [44][45][46] . Energy dispersive spectra (EDS) were conducted on a S-3400 N scanning electron microscope coupled with an energy dispersive analysis detector 33 .…”

Section: Measurement Inductively Coupled Plasma Optical Emission Spementioning

confidence: 99%

Full use of factors promoting catalytic performance of chitosan supported manganese porphyrin

Huang

Wang

et al. 2020

Sci Rep

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in order to make full use of the impact of internal and external factors on the performance of title catalyst for ethyl benzene oxidation, the key internal influencing factors on the catalytic performance were modulated by coordinating and grafting manganese porphyrin to mesoporous and macroporous chitosan, and the important external factors (i.e. oxidation reaction conditions) were optimized using Response Surface Methodology. Under the Response Surface Methodology optimized oxidation reaction conditions (176.56 °C, 0.59 MPa, and 0.25 mg amount of manganese porphyrin), the catalyst could be used at least five times. The ethyl benzene conversion, catalyst turnover numbers, and yields reached up to 51.2%, 4.37 × 10 6 and 36.4% in average, respectively. Compared with the other optimized oxidation reaction conditions, the corresponding values increased 17%, 26% and 53%. Relative to the manganese porphyrin, the catalytic performance and efficiency of the immobilized catalyst had notably increased. High-efficiency and high-selectivity oxidation of ethyl benzene (EB) has been still paid a great attention 1-6. There were so many advanced catalysts and catalytic ethyl benzene oxidation technologies 1-25 , some of which could even offer high yields of products 1-6. However, up to date the oxidation techniques used are not very satisfactory yet: There were mainly lack of cleaner production techniques, for examples, O 2 was not used as oxidant, toxic solvents were used, some energy saving and emission reduction had not been done, and so on. Therefore, the catalyst preparation 21-25 , the catalytic oxidation system and the oxidation conditions 7-20 , which are satisfactorily meeting to the cleaner production process should be comprehensively considered. Based on the above considerations, the internal influencing factors on the catalytic performance of catalyst should be further reasonably tuned, and the external influencing factors should be optimized via Response Surface Methodology (RSM). Because RSM has been successfully used in other catalysis fields: It has been used for optimization of the various reaction conditions and prediction of interactions between the influencing reaction condition parameters based on constructing a suitable model, evaluating the effects of key factors and searching the optimum reaction conditions. The better catalysis responses have achieved 26-29. These considerations and the various optimizations above will probably bring the advanced catalysis techniques 7-25 forwards better catalytic results and excellent various applications in practical chemistry industry. Due to a great deal of attention to the environmental issues, for modern companies which are manufacturing the products of acetophenone and phenylethanol via ethyl benzene oxidation, a set of strict modern technique of cleaner production has to be requested. Under the preconditions, the immobilized metalloporphyrins and their catalysis systems, which are usually not added any additives, co-reductants, and solvents, but oxygen molecules...

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“…The chitosan/montmorillonite membrane cross-linked by glutaraldehyde possessed the maximum capacity of 193 mg/g for palladium(II) at optimum pH 2 and was able to reach adsorption equilibrium in 90-100 min. [95]. The PSf/GO MMM had the maximum adsorption capacities of 79 mg/g for Pb 2+ , 75 mg/g for Cu 2+ , 68 mg/g for Cd 2+ , 17.5 mg/g for Ni 2+ , and 154 mg/g for Cr 6+ .…”

Section: Selective Propertiesmentioning

confidence: 89%

“…The next series of membranes are used for fabrication the inorganic adsorbents. The mainly used adsorbents are Al 2 O 3 [89,90], ZnO [91], TiO 2 [92], Fe 2 O 3 [93], manganese oxide (spinel-type) [94], montmorillonite [95], zeolites [96], Co-Fe 2 O 3 [97], activated carbon and their modifications, nanotubes [98], and graphene oxide [99].…”

Section: Selective Propertiesmentioning

confidence: 99%

Enhanced Specific Mechanism of Separation by Polymeric Membrane Modification—A Short Review

2021

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Membrane technologies have found a significant application in separation processes in an exceeding range of industrial fields. The crucial part that is decided regarding the efficiency and effectivity of separation is the type of membrane. The membranes deal with separation problems, working under the various mechanisms of transportation of selected species. This review compares significant types of entrapped matter (ions, compounds, and particles) within membrane technology. The ion-exchange membranes, molecularly imprinted membranes, smart membranes, and adsorptive membranes are investigated. Here, we focus on the selective separation through the above types of membranes and detect their preparation methods. Firstly, the explanation of transportation and preparation of each type of membrane evaluated is provided. Next, the working and application phenomena are evaluated. Finally, the review discusses the membrane modification methods and briefly provides differences in the properties that occurred depending on the type of materials used and the modification protocol.

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Adsorptive recovery of palladium(ii) from aqueous solution onto cross-linked chitosan/montmorillonite membrane

Abstract: A cross-linked chitosan/montmorillonite (CCTS-M) membrane was prepared successfully with a glutaraldehyde cross-linker, and then was characterized by FTIR, XRD, SEM/EDX, TG/DTG and XPS.

Cited by 38 publications

References 37 publications

Effect of Mesoporous Chitosan Action and Coordination on the Catalytic Activity of Mesoporous Chitosan-Grafted Cobalt Tetrakis(p-Sulfophenyl)Porphyrin for Ethylbenzene Oxidation

Effect of Mesoporous Chitosan Action and Coordination on the Catalytic Activity of Mesoporous Chitosan-Grafted Cobalt Tetrakis(p-Sulfophenyl)Porphyrin for Ethylbenzene Oxidation

Full use of factors promoting catalytic performance of chitosan supported manganese porphyrin

Enhanced Specific Mechanism of Separation by Polymeric Membrane Modification—A Short Review

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