Layered Double Hydroxide-Supported Carbon Dots as an Efficient Heterogeneous Fenton-Like Catalyst for Generation of Hydroxyl Radicals

Abstract

The development of a new heterogeneous Fenton-like catalyst is highly desired. Herein, we reported a simple and efficient method for the preparation of colloidal nanocomposites consisting of carbon dots and dodecylbenzenesulfonate (DBS)-layered double hydroxides (LDHs). The resulting nanocatalyst can function as an effective heterogeneous Fenton-like catalyst for the decomposition of acidified H 2 O 2 to generate abundant hydroxyl radicals (•OH). With the aid of chemiluminescence (CL) technique, electron spin resonance (ESR) measurements and ion chromatography (IC) separation technique, we demonstrated that the unique structural configuration of the carbon dot-DBS-LDH nanocomposites was responsible for the highly efficient catalytic activities toward H 2 O 2 decomposition. The fabricated material introduced a novel family of Fenton-like nanocatalysts with environmental friendliness, cost effectivity, and superior efficiency for the decomposition of H 2 O 2 to •OH radicals. Such heterogeneous Fenton-like catalyst could realize the degradation of DBS without any external energy input, showing a promising application for the oxidative degradation of organic contaminants in wastewater treatment applications.

Quantum dots‐based chemiluminescence probes: an overview

“…Compared with most organic dyes and traditional semiconductor QDs, CDs are superior in terms of low toxicity, high resistance to photobleaching, robust chemical inertness, high aqueous solubility, easy functionalization, and good biocompatibility, which make them promising potential platforms for CL sensing. Besides their use as catalysts in traditional CL systems for amplifying light emission, CDs could be used in various CL reactions acting as emission species, and have been shown to be promising sensing nanoprobes for CL analysis …”

“…Excited molecules (O 2 ) 2 * , produced from the recombination of • O 2− radicals then transferred their redundant energy to CDs and formed an excited state in the CDs (CDs * ), which acted as one of the final emitters of the strong CL emission. They also synthesized one type of colloidal nanocomposites made of CDs and dodecylbenzenesulphonate (DBS)−LDHs, which acted as a Fenton‐like catalyst to accelerate the decomposition reaction of acidified H 2 O 2 , inducing strong CL radiation. CDs loaded onto DBS−LDHs could donate electrons to acidified H 2 O 2 , and initiated the formation of • OH radicals.…”

Carbon dots‐involved chemiluminescence: Recent advances and developments

“…In addition to the earlier technique, CDs‐dodecylbenzenesulfonate (DBS)‐layered double hydroxides (LDHs) (CDs–DBS–LDH nanocomposites) were prepared and could act as significant heterogeneous Fenton‐like catalysts for the decomposition of acidified H 2 O 2 to form abundant OH · radicals, and thus generate the intense CL signals . The nanocomposites displayed some great benefits: the hydrophobic microenvironment of the DBS bilayer bunched on the surface of LDHs could guard the formed active intermediates, and a compact nanostructure appeared through the adsorption of CDs on the surface, facilitating the reaction between CDs and DBS.…”

“…Finally, CDs* were presumed to be formed through the CRET process from SO 2 * to the adjacent CDs of the nanocomposites. Two peaks located at 430 and 490 nm were accredited to the emission of excited SO 2 * and CDs*, respectively (Figure ) …”

Core–shell microspheres for the ultrafast degradation of estrogen hormone at neutral pH

“…[8][9][10][11][12] However, the efficiency of these heterogeneous Fenton-like catalysts is usually found to be lower than its homogeneous counterpart. Thus, the design of heterogeneous catalysts that can effectively harvest solar light and decompose H 2 O 2 into HOc without the need for a pH change is crucial for the practical application of solar Fentonbased wastewater treatments.…”