Combined use of surfactant-induced coagulation of poly(allylamine hydrochloride) with peroxidase-mediated degradation for the rapid removal of estrogens and phenolic compounds from water

Activated carbon obtained from sapelli wood sawdust by microwave heating for o-cresol adsorption

“…Kinetic data were fit using pseudo-first-order, pseudo-second-order, and Avrami fractional-order models, as given by the mathematical Eqs. (6), (7), and (8), respectively [36,37]:…”

“…There are many techniques for treatment of wastewater contaminated with phenolic compounds, including biological processes [5,6], coagulation [7], membranes [8], electro-Fenton and photoelectro-Fenton treatments [9], ozonation [10], oxidation [11,12], and adsorption [13][14][15][16]. However, application of these methods is restricted since they are very expensive and involve high initial capital and operational costs.…”

Fabrication and characterization of interpenetrating network hydrogels based on sequential amine‐anhydride reaction and photopolymerization in water

“…In the FTIR spectra of PAM (Figure 9A), the asymmetric and symmetric stretching vibration peaks of the carbonyl group in the maleic anhydride ring present at 1772 and 1847 cm À1 , respectively, and the peak at 1658 cm À1 is due to the stretching vibration of C O in the amide bond. [49,50] In the infrared spectrum of PAH, the peak around 3660 cm À1 is associated with the stretching vibration characteristic peak of N H, and the peak at 1455 cm À1 is C H symmetric deformation vibration in CH 2 NH 3 + [51][52][53] ; In the infrared spectrum of SC-Gel, the stretching vibration characteristic peaks of C O in anhydride (1772 cm À1 ) and N H in PAH (3660 cm À1 ) disappear. At the same time, the absorption peak of C O in carboxyl group presents at 1725 cm À1 , and the characteristic peak of amide shifts from 1658 to 1652 cm À1 .…”

“…In the infrared spectrum of SC-Gel (Figure 9C), the peak at 2873 cm À1 is assigned to the stretching vibration of methylene group, the peak at 1725 cm À1 is attributed to the stretching vibration of C O in carboxyl group, [54,55] and the stretching vibration peak of C O and N H in amide present respectively at 1652 and 1536 cm À1 , the peaks at 1350 and 1450 cm À1 correspond to the stretching vibration of C N in secondary amide and primary amide, respectively. [51][52][53] In the infrared spectrum of SP-Gel, the peaks at 1721 and 1658 cm À1 correspond to the stretching vibration of C O in ester group and amide group, respectively, while the peaks at 1540 and 1450 cm À1 correspond to the absorption of N H and C N in amide, respectively, [56][57][58] the characteristic peaks of sulfonic acid group located at 1238 and 1088 cm À1 . [59,60] By comparing the spectra of IPN IPN-Gel and two single networks SC-Gel and SP-Gel, we can see that the main infrared absorption peaks of single network SC-Gel and SP-Gel appear on the infrared spectrum of IPN-Gel, and the characteristic peaks of carbonyl groups in ester group and amide group are located at 1724 and 1662 cm À1 , respectively, and the characteristic peaks of sulfonyl group shift to 1248 and 1064 cm À1 , indicating that IPN-Gel is not a simple physical mixing of two signal networks.…”

Peroxidases Application in the Wastewater Treatment

“…O método também foi útil para a rápida remoção de diferentes compostos fenólicos e produtos farmacêuticos. 59 Além disso, foi avaliada a capacidade de tratamento de efluentes têxteis usando um tratamento biológico (Fungo Phanerochaete chrysosporium, por meio da atividade enzimática de peroxidase e lacase) seguido do método químico de ozônio. Uma boa descoloração, redução de fenóis totais e a redução de massa molecular foram obtidas durante o processo.…”