Facile Synthesis of Polyethylene Glycol@Tannin-Amine Microsphere towards Cr(VI) Removal

Abstract

Herein, a synthetic strategy for a rough microsphere Cr(VI)-adsorbent via the reaction of tannic acid (TA) and 1,6-hexanediamine (HA) and using polyethylene glycol (PEG) as surface modifier was presented. This adsorbent was characterized by a Fourier Transform Infrared spectrometer (FTIR), thermogravimetic analysis (TGA), X-ray photoelectron spectroscopy (XPS), etc. Certain factors, including contact time, PEG@poly(tannin-1,6-hexanediamine) (PEG@PTHA) dosage, initial concentration, and experimental temperature affecting the Cr(VI) adsorption performance of adsorbent were explored. PEG@PTHA can adsorb Cr and the Cr(VI) was reduced up to Cr(III) due to the existence of phenolic hydroxyl groups. Its adsorption capacity can reach up to 300 mg/g within 10 min and approximately 100% removal percentage below the initial concentration of 100 mg/L. Its behavior matched well with the Langmuir isotherm model and pseudo-second-order kinetic model. A PEG@PTHA adsorbent with maximum adsorption capacity (450 mg/g) has great prospects in Cr(VI)-sewage treatment.

Dual‐networks Enhanced Hollow ZIF‐8 Particles for Water Treatment

“…The vibration absorption peak appears at 3487 cm À 1 corresponds to the hydroxyl group of the PEG. [46] The spectrum of the DNHZIF-8 sample is significantly different. The stretching vibration peak at 3372 cm À 1 belongs to the hydroxyl group, however, is unable to be found in the PEG/ZIF-8 particles (Figure 6b).…”

“…[45] These peaks represent C−H stretching vibrations of the imidazole rings, the methyl group in imidazole, and C=N stretching vibration, respectively. The vibration absorption peak appears at 3487 cm −1 corresponds to the hydroxyl group of the PEG [46] . The spectrum of the DNHZIF‐8 sample is significantly different.…”

Multi-layer-structured bioactive glass nanopowder for multistage-stimulated hemostasis and wound repair

“…1 b), where the BNG@PTE spectra exhibited an intense and broad absorption peak at 1080 cm −1 that can be assigned to the Si–O–Si asymmetric stretching vibrations, revealing the existence of a silica network from BGN. After being coated with PTA, the characteristic absorption peaks were observed at 1700, 1590 and 1500 cm −1 , corresponding to the C O stretching vibration and the aromatic ring stretching vibration in PTA [ 38 , 39 ]. Several absorption peaks of BGN@PTE occurred at 2930 and 2860 cm −1 , which could be ascribed to the C–H asymmetric stretching in EPL.…”

Natural polyphenol tannin-immobilized composites: rational design and versatile applications

“…185 3.2.6 Other synthetic polymers. Moreover, other synthetic polymers, such as polyamide (PAM), 17,186 polyethylene glycol (PEG), [187][188][189] polyacrylonitriles (PAN), 190 and polypyrroles (Ppy), 191 were also used as substrates for the immobilization of tannins and their derivatives.…”