A novel carbon nanotube–magnesium oxide composite with excellent recyclability to efficiently activate peroxymonosulfate for Rhodamine B degradation

Abstract

There is an urgent need for an eco-friendly and efficient route to treat the organic pollutants in wastewater. Therefore, we report a facile synthesis of carbon nanotube-magnesium oxide composite (CNTs/MgO) which can efficiently activate peroxymonosulfate (PMS) to degrade Rhodamine B (RhB). Fabricated CNTs/MgO was characterized by XRD, FTIR, SEM, TEM, BET, XPS, and Raman. The results showed that the carbon nanotubes uniformly entangled on the MgO whiskers and linked to the MgO by Mg-C and CO bonds. The effects of temperature, pH value, CNTs/MgO dosage, PMS dosage and the ratio of MgO/CNTs on degradation of RhB were conducted to determine the activation performance of CNTs/MgO. The catalytic degradation process was carried out in a wide pH range of 3-9, and 100% of RhB was degraded in 20 min under optimized conditions. Moreover, the efficient degradation performance was attributed to singlet oxygen generated in the PMS&CNTs/MgO system. The excellent activation properties of CNTs/MgO was derived from the enhanced electron transport performance and chemical bonding between MgO and CNTs. In addition, this work provides an innovative design for the development of novel PMS catalysts without transition metal components.

Rapid fabrication of MgO@g-C3N4 heterojunctions for photocatalytic nitric oxide removal

“…The peaks at 287 and 397 eV were assigned to the C 1s and N 1s levels of g-C 3 N 4 , respectively [ 12 , 56 – 57 ]. In the MgO sample, the peaks of Mg 2p, Mg KLL, O loss, and O KLL levels are observed at 46, 304, 555, and 978 eV, respectively [ 58 – 59 ]. The HR-XPS of the C 1s level are shown in Figure 8b .…”

“…In the MgO sample, the peaks of Mg 2p, Mg KLL, O loss, and O KLL levels are observed at 46, 304, 555, and 978 eV, respectively [58,59]. The HR-XPS of the C 1s level are shown in Figure 8b.…”

Magnetic Fe3O4@CoFe-LDH nanocomposite heterogeneously activated peroxymonosulfate for degradation of azo-dye AO7

“…EtOH is considered to capture both SO 4 c and HOc at the same time. Meanwhile, the reaction rate constants of TBA/SO 4 c À and TBA/ HOc were 4.0-9.1 Â 10 5 M À1 s À1 and 3.8-7.6 Â 10 8 M À1 s À1 , thereby generally used as an effective scavenger for HO 49. As illustrated in Fig.8b, the addition of 10 mM and 100 mM TBA into the system led a mild decrease AO7 degradation efficiency within 10 min.…”

Activation of Peroxymonosulfate by Chrysotile to Degrade Dyes in Water: Performance Enhancement and Activation Mechanism

“…[4][5][6][7]), transition metal oxides (such as Fe 3 O 4 [8,9], MnO 2 [10,11], etc. ), non-metallic materials (such as nano-carbon materials [12], benzoquinones [13], boron [14], graphene [15], etc. ), or by different energies including ultrasound [16], heat [17] and light [18][19][20].…”