This in study, the applicability of CM-β-CD-Fe₃O₄NPs synthesis for eliminating boron from aqueous solutionsIdentical techniques including BET, FT-IR, XRD and SEM has been utilized to characterize this novel material.The maximum adsorption efficiency of boron onto CM-β-CD-Fe₃O₄NPs was 98.0%, at optimum values of the pH, adsorbent dosage, boron concentration, and contact time were found to be 5, 0.3 g, 50 mg/L, and 60 min for boron onto CM-β-CD-Fe₃O₄NPs sorbent, resp.The exptl. equilibrium data was fitted to the conventional isotherm models and accordingly Langmuir isotherm has good applicability for the explanation of exptl. data with maximum adsorption capacity (qmax) of the boron onto CM-β-CD-Fe₃O₄NPs were roughly 3.98 mgg^-1 resp.Kinetics experiments were performed to investigate the adsorption kinetics, the pseudo- second-order kinetic coincided quite with the kinetic results.The Thermodn. parameters of free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) of adsorption were determined using isotherms. ΔG0 = -6755.5 J/mol, ΔH0 = -80.86 J/mol and ΔS0 = -250.517 J/mol.K.The neg. value of (ΔGo, ΔHo and ΔSo) confirmed the sorption process was exothermic.The capability and usefulness of CM-β-CD-Fe₃O₄NPs for removing the boron from aqueous media was effectively proven.This method can not only adsorb harmful heavy metal elements, but also remove harmful substances, which has very high application value.

19 Dec 2023·Environmental Technology

Separation of dye from aqueous solution by a new gravity compression and aeration system

Article

Author: Li, Si ; Xiong, Nana ; Zhu, Guocheng ; Huang, Hongqi ; Hursthouse, Andrew S. ; Wan, Peng

Filtration is one of the important technologies for separating suspended particles. Under the condition of gravity compression, the filtration density can be increased and the separation effect of suspended particles can be improved. Considering the complex composition and the difficulty in degrading dye in industrial wastewater, a gravity compression aeration system with a modified polyester fibre ball (denoted as MPFB) was evaluated for the separation of dye from water. Congo red azo dye solution (0-40 mg/L) was selected as the model treatment compound. The MPFB was prepared by adjusting the concentrations of alkali (Quality score 0-25%), β-cyclodextrin (0∼80 g/L), reaction temperature (40-90°C), and silane coupler concentration (Concentration fractions 0-0.8%). We used Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) to characterise the MPFB. The separation was affected significantly by adsorption conditions such as MPFB dose and pH. The lower the MPFB dose, the higher the expected adsorption capacity. For the treatment of a dye solution at 500 mg/L, 100% removal was achieved with 48 g/L MPFB, at pH 8 during adsorption under non-circulation aeration. For 24 h of reaction, the system could reach the maximum adsorption capacity of 11.2 mg/g, which followed the pseudo-first order kinetics model and the intraparticle diffusion model. We discovered that circulation aeration provided the best adsorption and electrostatic and hydrogen bonding were the dominant components of adsorption. Overall, the system is a promising technology and has the potential to treat large volumes of dye wastewater.

08 Aug 2023·Journal of Dispersion Science and Technology

Effects of polycarboxylate superplasticizer equipped with β-cyclodextrin as the terminal group on the fluidity of montmorillonite-containing cement paste

Author: Wang, Ling ; Li, Bin

In this study, β-cyclodextrin (β-CD) as the terminal group was grafted on polyoxyethylene (PEO) via click reaction for preparing monovinyl β-Cyclodextrin monomer (β-P).Then β-P was employed to synthesize a polycarboxylate superplasticizer with β-CD grafted on the side chain [PAA-g-(β-P)_nHPEG].The functional groups, mol. weights, and mol. weight distributions of synthesized copolymers PAA-g-(β-P)_nHPEG were characterized by Fourier transform IR spectra (FT-IR), ¹H NMR spectroscopy, and gel permeation chromatog. (GPC).The dispersion performance of PAA-g-(β-P)_nHPEG in cement paste containing montmorillonite (MMT) clay was tested.Sorption measurement and X-ray diffraction (XRD) anal. revealed that the PAA-g-(β-P)_nHPEG intercalated less into the interlayer space of MMT than PAA-g-HPEG only with PEO as the side chain. β-CD as the terminal group grafted on the end of the side chain of PCE effectively hindered PCE sorption on MMT and enhanced the clay-tolerance property of PAA-g-(β-P)_nHPEG.This study offered a new idea in designing polycarboxylate superplasticizers to lower their clay sensitivity.

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