JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Fukun Bi,Xiaodong Zhang,Shang Xiang,Yunyun Wang
The effect of Pd loading (0.25, 0.5 and 1.0 wt%) and ZrO 2 support calcined at diverse temperatures (600, 700 and 800 °C) by pyrolysis of UiO-66 was investigated for CO oxidation in this work, respectively. The physicochemical properties of the samples were characterized by various characterization methods. The XRD results exhibited that all ZrO 2 support possessed mixed crystalline phase, the monoclinic ZrO 2 and tetragonal ZrO 2 . And the calcination temperature had a big impact on the composition of ZrO 2 supports. Pyrolysis of UiO-66 at high temperature was favorable for the formation of monoclinic ZrO 2 . Additionally, the introduction of Pd was induced the phase conversion from tetragonal to monoclinic of ZrO 2 . The order of catalytic efficiency was as follows: 0.5Pd/Zr-700 > 0.5Pd/Zr-600 > 0.5Pd/Zr-800. Moreover, 0.5Pd/Zr-700 presented high stability and great reusability. The good catalytic performance of 0.5Pd/Zr-700 was ascribed to the better reduction ability at low temperature and high O ads /O lat and Pd 0 /Pd 2+ on the surface. Importantly, the reaction pathway of CO oxidation over the 0.5Pd/Zr-700 was exposed.
研究领域:
催化化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
MEASUREMENT
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2014
·
IF 1.526
Yixin Liu,Wenjuan Zhu,Dan Wu,Qin Wei
Amino-group functionalized mesoporous Fe 3 O 4 nanoparticles were prepared by a simple solvothermal method. Palladium (Pd)-loaded amino-group functionalized mesoporous Fe 3 O 4 nanoparticles (Pd@Fe 3 O 4 ) were prepared with ethanol as the reductant. Pd@Fe 3 O 4 modified the glassy carbon electrode (GCE) exhibited excellent electrochemical catalytic activities towards dopamine (DA) due to the synergetic effect between Pd and Fe 3 O 4 . Electrochemical behavior of Pd@Fe 3 O 4 /GCE towards DA was studied using square wave voltammetry and the selective determination of DA was carried out successfully at high concentration of uric acid. A wide concentration range (0.96–107 μmol/L) and low detection limit (0.41 μmol/L, S/N = 3) for the determination of DA were obtained. The advantageous properties of this electrode for the DA determination lie in its excellent catalytic activity, selectivity and simplicity. The prepared sensor had been applied to the analysis of DA in human serum samples with satisfactory results.
研究领域:
分析化学
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生物医学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Jianhui Xu,Xin Fu,Yufeng Liu,Yunfei Zhang,Shenggui Chen,Dan Li,Chunhui Zhang,Jiale Gao,Yibo Fu
Electrocatalytic hydrodechlorination technology provides an attractive strategy to effectively eliminate the biotoxicity of halogenated organic pollutants (HOPs). Herein, we demonstrated a highly dispersed Pd loaded on blue TiO 2 nanotube arrays (Pd x -BTNA) cathode that can achieve efficient dechlorination and detoxification toward florfenicol (FLO). Characterization results indicated that strong interaction between Pd and BTNA was achieved through Pd-O bonds, which facilitated the electron transfer rate. Pd x -BTNA significantly outperformed other cathodes (i.e., BTNA, Pd x -TNA and Pd x -Ti) in the electrocatalytic dechlorination of FLO due to enhanced utilization of active H*. The dechlorination performances of FLO well followed the pseudo-first-order kinetic, and the reaction constant rate on Pd x -BTNA cathode (0.035 min −1 ) was 17.5, 1.94, 7.0 times higher than that on BTNA, Pd x -TNA and Pd x -Ti cathodes, respectively. Quenching experiments and electrochemical characterization indicated that both direct electron transfer and indirect reduction process mediated by H* were involved in the dechlorination of FLO. The optimal dechlorination efficiency of 98.79% was obtained by Pd x -BTNA cathode within 120 min at 1 mM PdCl 2 , applied cathode potential of −1.2 V. In addition, Pd x -BTNA exhibited superior stability and durability with almost no Pd leaching (0.0011 mg/L) during five dechlorination cycles. Our research proposed a novel strategy to design low noble Pd-loaded cathode material for efficient dechlorination and detoxification of HOPs.
研究领域:
环境科学
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材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Qiong Wu,Lu Wang,Baozheng Zhao,Lang Huang,Shitao Yu,Arthur J. Ragauskas
A highly stable Pd-loaded N-doped carbon catalyst (ACN pd ) for phenol hydrogenation was prepared from chitosan by hydrothermal carbonization. ACN pd does not require a reduction step before catalytic use due to the Pd in the as-prepared catalyst mainly exists in the form of Pd 0 (80%). The carbon support involves N-containing groups such as pyridinic nitrogen and pyrrolic nitrogen, which could provide basic sites to adsorb phenol effectively. The as-fabricated ACN pd shows high catalytic performance with turnover frequency (TOF) of 29.34 h −1 . Accordingly, a phenol conversion of 100% and a cyclohexanone selectivity of 99.1% are achieved in 5 h at 100 °C and 1 MPa H 2 . This outstanding performance is attributed to the synergetic effects of the Pd particles, the N-functional groups, and the Lewis acid sites on the support. The carbon support presents intrinsic Lewis acid sites due to its electrophilicity, and Pd doping further increases the strength of such acid sites as it causes electron-deficient structural features. Moreover, the Lewis acid sites inhibit the over-hydrogenation from cyclohexanone to cyclohexanol. This study provides new insights into the application of functional biomass-based carbon materials as catalyst supports.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
Processes
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2025
·Vol. 13
·期 3
·853
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IF 2.8
Chenghao Liang,He Liu,Jiahao Liang,Xiaodong Du,Xueqin Tao,Guining Lu
Polybrominated diphenyl ethers (PBDEs), a type of brominated flame retardant, are of global concern due to their environmental persistence, bioaccumulation, toxicity, and resistance to conventional remediation methods. In this study, the electrochemical reduction of 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47) with Pd/Metal foam electrodes (Ni, Cu, and Ag) was investigated. The effect of Pd loadings was explored, and the results show that Pd loading enhances the debromination performance, with 15.16%Pd/Ni foam exhibiting the best efficiency, followed by 9.37%Pd/Cu and 10.26%Pd/Ag. The degradation mechanisms for Pd/Ni and Pd/Ag are primarily hydrogen atom transfer, while for Pd/Cu, electron transfer dominates. Among the reduction products, Pd/Ni foam shows the highest debromination capability. The impact of electrolytes, current intensity, and bromination degrees of PBDEs was evaluated for 15.16%Pd/Ni. The results reveal that the presence of electrolytes inhibits BDE-47 degradation; the degradation rate of BDE-47 increases with current density, peaks at 4 mA, and decreases as current rises; and 15.16%Pd/Ni foam can effectively degrade PBDEs with varying bromination levels. Additionally, cycling tests show a decrease in efficiency from 94.3% (first cycle) to 56.58% (fourth cycle), attributed to Pd loss and structural damage. The findings offer valuable insights for developing efficient, sustainable catalytic materials for the electrochemical degradation of PBDEs and other persistent organic pollutants.
研究领域:
环境科学
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电化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Bangqia Huang,Qingge Feng,Zequan Li,Qihua Liang,Guo-Dong Li
Given the potential hazards posed by triethylamine (TEA) to human health and environmental safety, it is crucial to have real-time and efficient detection methods in place. However, the low reactivity of TEA poses a challenge in achieving effective detection at low temperature. Hence, a high-performance sensor for detecting TEA was developed using Pd-doped WO 3 prepared through a one-step electrospinning method. The sensor based on 1.0 wt% Pd-WO 3 exhibited exceptional performance in detecting TEA at low temperature (100 °C), showing a response of 246 to 20 ppm. Additionally, it demonstrated a low detection limit (0.03 ppm) and excellent selectivity characteristics. The outstanding sensing capability can be ascribed to the noble metal electron sensitization and spillover effects, which enhance the interaction between chemisorbed oxygen and TEA gas by adjusting the Fermi level of 1.0 wt% Pd-WO 3 . This adjustment achieves surface electron redistribution and optimizes interfacial atomic transport, while also reducing the activation energy required for gas sensing, thereby lowering the operating temperature.
研究领域:
材料科学
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环境科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Shaohui Zhang,Haikun Zhou,Hanxiao Liao,Pengfei Tan,Wenying Tian,Jun Pan
Whereas limited amount of precious metal adsorbed by bacteria conflicting the needs of high loadings for better catalytic performances, cell disruption technology was adopted to smash Shewanella cells in this work, releasing abundant oxygen functional groups inside the cells for better adsorption of palladium ion. Then palladium catalysts were synthesized in two ways: 1) Pd catalyst supported on carbonized-broken-bacterial (Pd/FHNC) was obtained after direct carbonization and reduction; 2) Electrospinning technology was used to spin the broken Shewanella into fibers, and Pd nanoparticles supported on nitrogen-doped carbon nanofiber (Pd/NCNF) was prepared following carbonization and hydrogen reduction. The as-prepared catalysts exhibit excellent oxygen reduction reaction (ORR) electrocatalytic performance in the acid medium. The mass specific activities at 0.7 V of Pd/FHNC and Pd/NCNF were 0.213 A mg −1 and 0.121 A mg −1 which were 5.92 and 3.36 times than those of commercial Pd/C(0.036 A mg −1 ) respectively, and they also displayed higher stability than Pd/C. Furthermore, the Pd loadings of Pd/FHNC and Pd/NCNF were 21.52% and 17.13% respectively. An explanation for the improved performance is the co-doping of nitrogen and phosphorus, also the tight integration of Pd and broken-bacterial. Herein, we propose a novel and effective method for synthesis of ORR electrocatalysts .
研究领域:
生物化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
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IF 5.31
Yang Li,Chunyan Ma,Hongling Yang,Zhongshen Zhang,Xin Zhang,Nanli Qiao,Junhui Wang,Zhengping Hao
The traditional reaction temperatures of 1-butene isomerization to 2-butene tend to above 100 °C, while here we report the unique catalytic performance of a Pd loaded silica nanospheres catalyst for 1-butene double-bond-shift isomerization at room temperature and showed 2-butene yield of 37.0%. Furthermore, the introduction of O 2 into the reaction mixture dramatically improved the yield efficiency to 57.2% without the formation of by-product CO 2 . The reaction process is proved that the ratio of trans -2-butene to cis -2-butene in the final product was determined by the trans : cis ratio of the butenylcarbenium ion intermediate, and the ratio of trans -2-butene to cis -2-butene decreased with the increasing reaction temperature. Unlike other palladium catalyst systems, Pd 0 nanoparticles were proved to act as catalytic active sites, and their oxidation and aggregation resulted in a decrease in activity. Most importantly, the catalyst acidity affected the catalytic performance, which provides theoretical basis for the choice of catalysts.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Xingjie Yang,Xubao Jiang,Muhammad Sohail Bashir,Xiang Zheng Kong
Polyurethanes (PUNs) have been widely used in many fields. However, there are few reports on their microsphere preparation through precipitation polymerization. Herein, uniform PUN microspheres are prepared by precipitation polymerization of toluene diisocyanate and trimethylolpropane, without any surfactant and stabilizer. Under optimized conditions, monomers are fully polymerized within 2 h at a monomer concentration as high as 25.0 wt %, with a high yield of the microspheres (96.9%). By loading Pd on their surface, composite microspheres Pd@PUN are obtained and used as catalysts. 4-Nitrophenol is completely reduced within 1 min, with a kinetic constant of 4.96 min–1, significantly higher than many reported Pd-loaded catalysts, and with comparable reusability. Used in degradation of dye molecules, the catalytic performance is practically unchanged after 20 recycled uses. This work provides a simple method for the preparation of highly uniform PUN microspheres with a high yield and their Pd-loaded catalysts, both of great potential for various applications.
研究领域:
材料科学
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催化化学
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环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Jing Li,Junwei Fan,Fei Hu
Porous starch, with excellent renewal and thermodynamic stability characteristics, could be utilized as a novel carrier for metals. In this research, starch was obtained from wasted loquat kernel (LKS) and converted into loquat kernel porous starch (LKPS) through ultrasound-assisted acid/enzymatic hydrolysis. Then, LKS and LKPS were utilized for loading with palladium. The porous structures of LKPS were evaluated by the results of water/oil absorption rate and N 2 adsorption analysis, and the physicochemical properties of LKPS and starch@Pd were analyzed by FT–IR, XRD, SEM–EDS, ICP–OES, and DSC–TAG. LKPS prepared by the synergistic method formed a better porous structure. Its specific surface area was 2.65 times that of LKS, and the water/oil absorption capabilities were considerably improved to 152.28 % and 129.59 %, respectively. XRD patterns showed that the presence of diffraction peaks at 39.7° and 47.1°, indicating successful palladium loading onto LKPS. The EDS and ICP–OES results revealed that the palladium loading capacity of LKPS was superior to that of LKS, with a significantly increased loading ratio of 2.08 %. In addition, LKPS@Pd exhibited excellent thermal stability , with a temperature range of 310–320 °C. Therefore, LKPS was a palladium carrier with highly efficient loading ratio, and LKPS@Pd had promising properties as a competent catalyst.
研究领域:
食品科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Tiefu Li,Ming He,Peng Zhang,Zhiquan Yu,Jiaming Liu,Yingya Liu,Yao Wang,Anjie Wang
Continuous-flow processing is considered as a disruptive technology in the synthesis of active pharmaceutical ingredients and other fine chemicals. However, it remains extremely challenging to immobilize heterogeneous catalysts in the channels of microreactors in a facile and flexible manner. In the present investigation, a polymer monolith coiled copper reactor was fabricated by Cu-catalyzed polymerization of acetylene at atmospheric pressure in the temperature range of 290–370 °C. The polymerization yielded a cotton-like structure of carbonaceous fibers, which were able to assemble by themselves to form a monolith inside the copper tube. The characterization results revealed that unsaturated C═C groups, which are favorable for post-surface modification, were present on the carbonaceous fibers. After air oxidation at 160 °C for 10 h, a fraction of the C═C groups were converted to C═O groups. By strong interaction with C═O groups, Pd was immobilized in the polymer monolith by circulating an ethanol solution of palladium acetate through the copper tube. A 1000 mm-long monolith tube reactor with an inner diameter of 2 mm with a Pd loading of 1.15 wt % was fabricated and used in the continuous Suzuki–Miyaura coupling reaction. An ethanol–water (2:1 in volume) solution of iodobenzene (0.0125 M), phenylboronic acid (0.0188 M), and potassium carbonate (0.0250 M) was used as the feed, and the reaction took place at 100 °C and 1.0 MPa. The selectivity to biphenyl was kept at >99% with complete conversion of iodobenzene in a 100 h run.
研究领域:
化学工程
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材料科学
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催化化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Xia Jiang,Yang Liu,Haijiao Hao,Yan Xu,Jiale Huang,Daohua Sun,Qingbiao Li
Herein, we described a mild and facile method for the synthesis of three-dimensional (3D) hierarchically porous TiO2. This method simultaneously realized the C,N self-dopant, introduced more surface defectives, and decreased in the band-gap energy (Eg) of TiO2. Rape pollen was chosen as the biotemplate to prepare TiO2, and the pore property of the obtained products could be adjusted by changing the amount of Ti precursor and calcination temperature. The as-synthesized pollen-TiO2 not only duplicated the morphology of rape pollen, but also showed enhanced 1-butene selectivity in the reaction of selective hydrogenation of 1,3-butadiene after loading elemental Pd, when comparing with the commercial TiO2. Butenes selectivity of 98% and 1-butene selectivity of 66% were achieved at 50 °C, because of the hierarchically porous structure of pollen-TiO2 and the lower Eg and more surface defects resulting from the C,N dopant.
研究领域:
材料科学
·
催化
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纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）