13C NMR and XPS characterization of anion adsorbent with quaternary ammonium groups prepared from rice straw, corn stalk and sugarcane bagasse

Cao, Wei; Wang, Zhenqian; Zeng, Qingling; Shen, Chunhua

doi:10.1016/j.apsusc.2016.07.095

Cited by 91 publications

(31 citation statements)

References 39 publications

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“…The S 2p peak was resolved into three components; the binding energy (BE) components were observed at 164.8, 163.4, and 162.0 eV, corresponding to H–S, C–S, and Cu–S bonds, respectively [41,42]. Figure 6c shows that only one peak appeared at 401.9 eV in the N 1s XPS high-resolution spectra of TEBAC-HKUST-1 MOR, consistent with those for previously reported quaternary ammonium [43]. This indicates that quaternization reaction occurred, and quaternary ammonium functional groups were grafted onto the MOFs.…”

Section: Resultssupporting

confidence: 86%

Two-Step Elution Recovery of Cyanide Platinum Using Functional Metal Organic Resin

Chen

Jiang

et al. 2019

Molecules

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A novel functional ion-exchange/adsorption metal organic resin (MOR), TEBAC-HKUST-1, was prepared and characterized. Ethanedithiol was used as the grafting agent to introduce thiol groups onto HKUST-1, and 4-vinylbenzyl chloride was then grafted onto SH-HKUST-1 using thiol groups. Finally, the quaternary ammonium functional group was immobilized onto the carrier by performing a quaternization reaction. The structure and property of TEBAC-HKUST-1 MOR were characterized by TGA, N2 adsorption–desorption, FTIR, SEM, and XRD. TEBAC-HKUST-1 MOR was used to remove metal cyanide complexes from wastewater. The adsorption was rapid, and the metal cyanide complexes including Pt(CN)42−, Co(CN)63−, Cu(CN)32−, and Fe(CN)63− were removed in 30 min. TEBAC-HKUST-1 MOR exhibited a high stability in neutral and weak basic aqueous solutions. Furthermore, Pt(II) could be efficiently recovered through two-step elution. The recovery rate of Pt(II) for five cycles were over 92.0% in the mixture solution containing Pt(CN)42−, Co(CN)63−, Cu(CN)32−, and Fe(CN)63−. The kinetic data were best fitted with the pseudo second-order model. Moreover, the isothermal data were best fitted with the Langmuir model. The thermodynamic results show that the adsorption is a spontaneous and exothermic process. TEBAC-HKUST-1 MOR not only exhibited excellent ability for the rapid removal of metal cyanide complexes, but also provided a new idea for the extraction of noble metals from cyanide-contaminated water.

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Section: Resultssupporting

confidence: 86%

Two-Step Elution Recovery of Cyanide Platinum Using Functional Metal Organic Resin

Chen

Jiang

et al. 2019

Molecules

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“…The N1s signal confirms the presence of nitrogen and reveals two different chemical environments in roughly 1:1 ratio. The contribution centered at 400.0 and 402.3 eV can be attributed to free and coordinated to the metal amine groups, respectively [26, 27] . The effect of DAP grafting on the porosity of MUV‐12 is quite similar to that observed for MUV‐10.…”

Section: Resultssupporting

confidence: 56%

Selective Implantation of Diamines for Cooperative Catalysis in Isoreticular Heterometallic Titanium–Organic Frameworks

et al. 2021

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We introduce the first example of isoreticular titanium–organic frameworks, MUV‐10 and MUV‐12, to show how the different affinity of hard Ti(IV) and soft Ca(II) metal sites can be used to direct selective grafting of amines. This enables the combination of Lewis acid titanium centers and available ‐NH2 sites in two sizeable pores for cooperative cycloaddition of CO2 to epoxides at room temperature and atmospheric pressure. The selective grafting of molecules to heterometallic clusters adds up to the pool of methodologies available for controlling the positioning and distribution of chemical functions in precise positions of the framework required for definitive control of pore chemistry.

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“…It is noteworthy that the peak intensity of Cl − species is low; indicating that the adsorbed BTC inhibitor lowers the adsorption affinity of the Cl − ions to the metal surface which subsequently lessens the corrosion rate. The adsorption of the BTC inhibitor on the reinforcing steel surface is further confirmed by the analysis of C spectra, which showed the presence of CN + -R 3 and (C-C & C-H) at BE of 284.5 and 287.7 eV, respectively 42,43 , see Fig. 10b.…”

Section: Resultsmentioning

confidence: 67%

Enhancing the corrosion resistance of reinforcing steel under aggressive operational conditions using behentrimonium chloride

Radwan

Sliem

Yusuf

et al. 2019

Sci Rep

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Aggressive operational conditions e.g. saline media and acidic gases, e.g., CO2 can increase the corrosion rate of reinforcing steel. Accordingly, the necessity to protect the steel under the above conditions without affecting the mechanical properties of the concrete is growing. Herein, the inhibition efficiency of a new corrosion inhibitor, behentrimonium chloride (BTC, C25H54ClN), is explored in a simulated-concrete pore solution (SCP) with 3.5 wt.% NaCl at different pH using electrochemical impedance spectroscopy (EIS) and polarization methods. Using only a 50 μmol L−1 of BTC, we are able to measure an inhibition efficiency of 91, 79, and 71% in SCP solution with 3.5% NaCl at pH of 12.5, 10 and 7, respectively without showing any effect on the mechanical properties on the cured mortars. Temkin isotherm is used to describe the physisorption of BTC inhibitor on the steel surface. Also, the adsorption and influence of the inhibitor on the metal surface are characterized using the scanning electron microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. In conclusion, this new inhibitor shows high corrosion inhibition efficiencies under different aggressive conditions and can be used in concrete to reduce the corrosion rate of reinforcing steel without decreasing the mechanical properties of the concrete.

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13C NMR and XPS characterization of anion adsorbent with quaternary ammonium groups prepared from rice straw, corn stalk and sugarcane bagasse

Cited by 91 publications

References 39 publications

Two-Step Elution Recovery of Cyanide Platinum Using Functional Metal Organic Resin

Two-Step Elution Recovery of Cyanide Platinum Using Functional Metal Organic Resin

Selective Implantation of Diamines for Cooperative Catalysis in Isoreticular Heterometallic Titanium–Organic Frameworks

Enhancing the corrosion resistance of reinforcing steel under aggressive operational conditions using behentrimonium chloride

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