Nitrogen-doped bamboo-like carbon nanotubes with Ni encapsulation for persulfate activation to remove emerging contaminants with excellent catalytic stability

Abstract

Nitrogen-doped bamboo-like carbon nanotubes encapsulated with nickel nanoparticles (Ni@NCNTs) were feasibly fabricated by a one-pot pyrolysis route. The characterization techniques revealed the surface morphology, structure and chemical composition of the as-prepared catalysts synthesized in different conditions. Ni@NCNTs were employed as both adsorbents and catalysts for activating persulfate to remove an emerging pollutant, antibiotic sulfachloropyridazine. The nitrogen modification enhanced both adsorption capacity and catalytic ability of Ni@NCNTs and proved to be a promising alternative to metal oxides and other carbon catalysts. Moreover, Ni@NCNTs showed an excellent stability because of nitrogen heteroatom doping and Ni nanoparticle encapsulation.Electron paramagnetic resonance (EPR) and classical radical quenching tests discovered a simultaneous radical/non-radical mechanism in Ni@NCNTs/persulfate system. The results indicated that the novel nano-architectured catalyst materials can show emerging functionalities for environmental remediation processes.

Preparation and Catalytic Performance of Expanded Graphite for Oxidation of Organic Pollutant

“…The structural or chemical compositional modification of carbon materials could significantly improve the catalytic activity. Nitrogen doping [23,24] and sulfur doping [25] were commonly used modification methods. Besides sp 2 carbon and the oxygen-containing functional groups, nitrogen and sulfur dopants also contributed to boost electron transfer.…”

Sulfate radical-induced transformation of trimethoprim with CuFe2O4/MWCNTs as a heterogeneous catalyst of peroxymonosulfate: mechanisms and reaction pathways

“…30,31 Thus, $OH and SO 4 c À were shown to be involved in the catalytic degradation process. 32 To further identify the types of major reactive radical species generated in the degradation system, ethanol (EtOH) and tertbutyl alcohol (TBA) were added into the reaction solution as radical quenching agents. EtOH (containing a-hydrogen) reacted with $OH and SO 4 c À at high and comparable rates, where the rate constants for the reactions with $OH and SO 4 c À were 1.2-2.8 Â 10 9 mol L À1 s À1 and 1.6-7.7 Â 10 7 mol L À1 s À1 , respectively.…”

Comparative Study of the Oxidative Degradation of Different 4-Aminobenzene Sulfonamides in Aqueous Solution by Sulfite Activation in the Presence of Fe(0), Fe(II), Fe(III) or Fe(VI)

“…Several techniques for the treatment of water pollutants by organic compounds, such as biological treatment, adsorption, membrane filtration, traditional and advanced oxidation technologies (AOTs), have been developed in the last decade [1][2][3]. The AOTs are commonly characterized by the generation of reactive species, including hydroxyl, superoxide, and sulfate radicals, as well as singlet oxygen, and have proven to be highly efficient degrading organic pollutants [4][5][6].…”