Interaction between copper and carbon nanotubes triggers their mutual role in the enhanced photodegradation of p-chloroaniline

Abstract

Copper (Cu, 1-5 wt%) was loaded onto carbon nanotubes (CNTs) by a simple electrochemical method. The physicochemical properties of catalysts (Cu/CNTs) were characterized by using X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen (N2) adsorption-desorption, Fourier transform infra-red spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and electron spinning resonance (ESR). The results showed that the Cu was distributed well on the CNT surface by the interaction of Cu(2+) ions with -OH and -COOH groups on the CNT surface, which preferentially occurred at the defect sites along the CNT backbone. The Cu-O-C bonds formed were found to play an important role in enhancing the photoactivity of the catalysts. The highest number of Cu-O-C bonds possessed by 3 wt% Cu/CNTs demonstrated the best performance in the degradation of p-chloroaniline (96%) under UV light irradiation within 5 h of reaction at 27 °C and under neutral pH conditions. Kinetic studies showed that the degradation followed the pseudo-first order model and the surface reaction was the controlling step. It is believed that these results could contribute to the synthesis of various supported catalysts for various applications.

New insight into the kinetic study on the different loadings of the CuO/CNT catalyst and its optimization for p-chloroaniline photodegradation

“…A further addition to 5 wt% CuO seems to inhibit degradation due to the excess dispersion of less active CuO on the surface of CNTs. 17 From these results, it can be concluded that there is an optimum amount of CuO, which should be loaded on CNTs for the best Cu-CNT interaction for the enhanced degradation of PCA in both Vis and UV irradiation systems. For evaluation, an additional experiment on the photodegradation of PCA was conducted using commercial TiO 2 under the same conditions to compare the performance with the synthesized catalyst.…”

Regulation of Ni–CNT Interaction on Mn-Promoted Nickel Nanocatalysts Supported on Oxygenated CNTs for CO2 Selective Hydrogenation

“…The surface chemistry and the thermal stability of oxygen-modified CNTs were characterized by energy-dispersive X-ray spectroscopy (EDS) mapping, FTIR, and TPD-MS. As observed in Figure 2a,b, the acidic treatment of CNTs successfully introduced SOGs mainly from carboxyl (−COOH). 42 The thermal stability of SOGs was determined by TPD-MS experiment under pure Ar, in situ monitoring the decomposition product of oxygen-modified CNTs, to better understand the modulation role of SOGs in physicochemical properties and Ni−CNT interactions. As displayed in Figure 2c, CO and CO 2 could be detected when the temperature exceeded 400 °C.…”

“…Toward understanding the tunable metal-support interaction in Ni-CNT system3.2.1. Surface property of oxygen functionalized CNT supportsThe surface chemistry and the thermal stability of oxygen modified CNTs were characterized by EDS-mapping, FTIR, and TPD-MS. As observed inFigure 2aand b, the acidic treatment CNTs successfully introduced SOGs mainly from carboxyl (-COOH) 42. The thermal stability of SOGs was determined by TPD-MS experiment under pure Ar, in-situ monitoring the decomposition product of oxygen modified CNTs, in order to better understand the modulation role of SOGs in physicochemical properties and Ni-CNT interaction.…”

Removal of 3-Chloroaniline from aqueous solution by Treated Coffee Waste: Isotherm Modelling and Thermodynamic Studies

“…It will however be lowered because in some countries in particular the European Union, the ban on CIPC has started [7]. of 26 Many approaches are currently being used to remove chloroaniline compounds from wastewater effluents, for instance photodegradation [21,22], hydrodechlorination [23], oxidation [24,25], biodegradation [26], electrochemical oxidation [27] and sorption [28][29][30]. Amongst all, sorption is a reliable method that has been applied widely because of its effectiveness, simplicity, rapidness, cost effectiveness and the possibility of organic pollutants being recovered as reuse resources [31][32][33][34][35].…”