Convenient preparation of Pd/RGO catalyst for the efficient hydrodechlorination of various chlorophenols

Jiang, Weidong; Xiang, Zhou; Xu, Bin; Li, Xiaojing; Liu, Fuan; Fan, Guangyin

doi:10.1039/c5nj02349a

Cited by 12 publications

(3 citation statements)

References 19 publications

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“…The lower intensity of the peaks associated with the oxygen-containing groups (e.g., the O-H stretching vibration at 3426 cm −1 , C=O stretching and C-O stretching bands at 1706 cm −1 and 1069 cm −1 , respectively, and the C=O vibrations and C-O group at the edges of GO at 1287 and 1040 cm −1 , respectively) were observed for rGO. Low peak intensities of the oxygen-containing groups on the rGO surface are indicative of the successful reduction of GO [63]. Accordingly, based on this characterization, it was concluded that the desired Pd/Al and Pd/rGO catalysts were successfully obtained.…”

Section: Resultsmentioning

confidence: 72%

Catalytic Hydrodechlorination of 4-Chlorophenol by Palladium-Based Catalyst Supported on Alumina and Graphene Materials

2023

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Hydrodechlorination (HDC) is a reaction that involves the use of hydrogen to cleave the C−Cl bond in chlorinated organic compounds such as chlorophenols and chlorobenzenes, thus reducing their toxicity. In this study, a palladium (Pd) catalyst, which is widely used for HDC due to its advantageous physical and chemical properties, was immobilized on alumina (Pd/Al) and graphene-based materials (graphene oxide and reduced graphene oxide; Pd/GO and Pd/rGO, respectively) to induce the HDC of 4-chlorophenol (4-CP). The effects of the catalyst dosage, initial 4-CP concentration, and pH on 4-CP removal were evaluated. We observed that 4-CP was removed very rapidly when the HDC reaction was induced by Pd/GO and Pd/rGO. The granulation of Pd/rGO using sand was also investigated as a way to facilitate the separation of the catalyst from the treated aqueous solution after use, which is to improve practicality and effectiveness of the use of Pd catalysts with graphene-based support materials in an HDC system. The granulated catalyst (Pd/rGOSC) was employed in a column to induce HDC in a continuous flow reaction, leading to the successful removal of most 4-CP after 48 h. The reaction mechanisms were also determined based on the oxidation state of Pd, which was observed using X-ray photoelectron spectroscopy. Based on the results as a whole, the proposed granulated catalyst has the potential to greatly enhance the practical applicability of HDC for water purification.

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Section: Resultsmentioning

confidence: 72%

Catalytic Hydrodechlorination of 4-Chlorophenol by Palladium-Based Catalyst Supported on Alumina and Graphene Materials

2023

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“…Next, the catalytic properties of the Pd‐RGO synthesized in the manner shown in Figure were tested through the Suzuki–Miyaura reaction. In previous studies, large amounts of reducing agents were used in the preparation of Pd‐RGO, which required a purification process before being used as a catalyst . However, we expected that the Pd‐RGO could be used immediately without any purification, if the reduction was conducted with a minimum amount of reducing agent and at a high temperature.…”

Section: Catalytic Activity Of Pd‐rgos Depending On the Reduction Temmentioning

confidence: 99%

Droplet‐based Continuous Flow Synthesis of Palladium Supported on Reduced Graphene Oxide

Jang

Nam

Son

et al. 2020

Bulletin Korean Chem Soc

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“…Moreover, the resulting products including phenol and 4-aminophenol (4-AP) are useful chemicals that can be applied in various applications [ 15 ]. Considerable research efforts have been devoted to developing supported catalysts with Pd nanoparticles as the active sites for HDC and hydrogenation reactions [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. However, one limitation of the HDC of 4-CP reaction is that the catalysts suffer from serious deactivation by HCl, which is generated as a byproduct during the HDC process through the scission of C–Cl bonds in 4-CP.…”

Section: Introductionmentioning

confidence: 99%

Palladium Supported on Titanium Carbide: A Highly Efficient, Durable, and Recyclable Bifunctional Catalyst for the Transformation of 4-Chlorophenol and 4-Nitrophenol

Fan

et al. 2018

Nanomaterials

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Developing highly efficient and recyclable catalysts for the transformation of toxic organic contaminates still remains a challenge. Herein, Titanium Carbide (Ti3C2) MXene modified by alkali treatment process was selected as a support (designated as alk-Ti3C2X2, where X represents the surface terminations) for the synthesis of Pd/alk-Ti3C2X2. Results show that the alkali treatment leads to the increase of surface area and surface oxygen-containing groups of Ti3C2X2, thereby facilitating the dispersion and stabilization of Pd species on the surface of alk-Ti3C2X2. The Pd/alk-Ti3C2X2 catalyst shows excellent catalytic activity for the hydrodechlorination of 4-chlorophenol and the hydrogenation of 4-nitrophenol in aqueous solution at 25 °C and hydrogen balloon pressure. High initial reaction rates of 216.6 and 126.3 min−1·gpd−1 are observed for the hydrodechlorination of 4-chlorophenol and hydrogenation of 4-nitrophenol, respectively. Most importantly, Pd/alk-Ti3C2X2 exhibits excellent stability and recyclability in both reactions without any promoters. The superior property of Pd/alk-Ti3C2X2 makes it as a potential material for practical applications.

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Convenient preparation of Pd/RGO catalyst for the efficient hydrodechlorination of various chlorophenols

Abstract: Highly active Pd/RGO (RGO, reduced graphene oxide) was easily prepared by a one pot co-reduction of Pd ions and GO using NaBH4. The as-prepared catalyst exhibited excellent reactivity towards the degradation of chlorophenols under mild conditions without additives.

Cited by 12 publications

References 19 publications

Catalytic Hydrodechlorination of 4-Chlorophenol by Palladium-Based Catalyst Supported on Alumina and Graphene Materials

Catalytic Hydrodechlorination of 4-Chlorophenol by Palladium-Based Catalyst Supported on Alumina and Graphene Materials

Droplet‐based Continuous Flow Synthesis of Palladium Supported on Reduced Graphene Oxide

Palladium Supported on Titanium Carbide: A Highly Efficient, Durable, and Recyclable Bifunctional Catalyst for the Transformation of 4-Chlorophenol and 4-Nitrophenol

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