SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Duchao Zhang,Xiaoyun Jia,Guanxing Ren,Weifeng Liu,Lin Chen,Tianzu Yang
Spent automotive catalysts (SAC) is the most important secondary resource for the recovery of platinum group metals (PGMs). This paper demonstrates that the acid-resistant and alkali-resistant cordierite carrier can be transformed into hydroxysodalite by a alkaline hydrothermal treatment (AHT), which can then be dissolved by subsequent acid leaching (AL) to enrich PGMs. Experiments were conducted to assess the influencing factors and the optimal conditions were determined as follows: holding temperature of 150 °C; NaOH to raw material mass ratio 10:10; holding time of 60 min; liquid to solid ratio of 3:1, and stirring speed of 400 rpm. The residue ratio in the AHT process was 132.57% under optimized conditions. The total residue ratio was 18.68% under fixed acid leaching experimental conditions of holding temperature of 60 °C, liquid to solid ratio of 15:1, holding time of 60 min, stirring speed of 400 rpm, and hydrochloric acid concentration of 2.5 mol·L -1 . The contents of Pt, Pd, and Rh in the enriched residue reached 650.50, 2131.54, and 405.28 g·t −1 , respectively, and the corresponding enrichment times were 7.13, 7.25, and 7.07. The additions of sodium formate before the AHT and aluminum powder during the AL were found to effectively inhibit PGMs leaching. The losses of Pt, Pd, and Rh throughout the entire process were only 2.77%, 1.89%, and 4.28%, respectively.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 24
·5974-5981
·
IF 5.773
Jinliang Zhu,Shangli Huang,Julian Key,Shuangxi Nie,Shaojian Ma,Pei Kang Shen
Metal phosphides are of great recent interest as promoters to precious metal-driven catalytic oxidation of alcohols in direct alcohol fuel cells. In this work, a novel approach for facile and environmentally friendly synthesis of molybdenum phosphide (MoP) nanocrystals anchored on graphitized carbon is developed by one-step pyrolysis of a phosphorus-containing resin exchanged with Mo5+. A significant promotion effect of MoP on Pt in methanol electrooxidation is observed. The Pt–MoP/C catalyst exhibits ultrahigh electroactivity, and compared to commercial Pt/C, this catalyst reaches a −140 mV more negative onset potential and has 10 times the mass activity at 0.4 V vs. SCE and 5.1 times the peak mass activity. In addition, Pt–MoP/C has also excellent stability and CO tolerance, including a peak mass activity retention of 81.4% after 1000 cycles as compared to that of 51.6% on commercial Pt/C and a 140 mV more negative COad oxidation potential. The noteworthy promotion effect of MoP on Pt in methanol electrooxidation is also evaluated by theoretical calculations.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2016
·
IF 2.101
Qingfa Wang,Qifeng Li,Ruoping Yanzhang,Junfeng Zhang,Xiangwen Zhang
A facile and effective solvothermal method was developed to tailor the morphology and size of Pt nanocrystals by tuning the concentration of 1-octylamine (OAm). Three shaped Pt nanocrystals (NCs), 0D sphere & icosahedra, 2D plate and 3D multipods, were synthesized sequentially with increasing the OAm concentration from 5% to 100% in the solvent mixture OAm and N, N -dimethylformamide (DMF). These Pt NCs exhibited high catalytic performance toward the reduction of p -nitrophenol. The strategy presented in this work open a new avenue for easily developing high dimensional Pt nanocrystals, especially for rare 2D plate.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Fangyong Yu,Yujiao Xie,Huiqin Tang,Naitao Yang,Xiuxia Meng,Xiaobin Wang,Xin Long Tian,Xu Yang
Alloying Pt electrocatalysts with the second transition metal (e.g., Fe, Co, Ni and Cu) is an effective strategy to boost the methanol oxidation reaction (MOR) and simultaneously reduce the catalyst cost for the direct methanol fuel cells. However, the durability issues caused by the leaching of the transition metals for prolonged time and carbon corrosion hinder the practical applications of the Pt alloys. Herein, for the first time, a facile and robust strategy is developed to synthesize titanium nitride and copper doped titanium nitride with porous and hierarchical tubular structures (labeled as TiN NFs and Ti 0.9 Cu 0.1 N NFs, respectively). When used as the Pt support, both of Pt/TiN NFs and Pt/Ti 0.9 Cu 0.1 N NFs exhibit much enhanced activity and durability compared with the commercial Pt/C catalyst. The experimental data confirms that the leaching of the transition metal can be significantly impeded by this strategy while their advantageous properties that favors MOR activity for the Pt based catalysts are maintained. This work opens a new path for maximizing the MOR activity and stability by introducing porous binary transition metal nitride as the Pt support, which integrates the advantages of high stability, co-catalysis and doping effects.
研究领域:
材料科学
·
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2022
·
IF 6.137
Changjin Xu,Yinglei Liu,Baljeet Singh,Shiyuan Yi,Gaowu Qin,Song Li
Interfacial local environment of noble metal nanoparticles (NPs) and support is crucial for the development and design of thermally and chemically stable noble metal heterogeneous catalysts. The unique chemical environment can strengthen the NPs interaction with the support surface, which can effectively avoid the agglomeration of NPs . The strategy is developed to modulate the interfacial chemical environment of supported Pt NPs with the help of the unsaturated Al 3+ in Al 2 O 3 N (nanobelt) support, resulting in a sintering-resistant Pt/Al 2 O 3 N catalyst. Al solid-state MAS NMR characterization shows that Al 2 O 3 N support contains a large amount of unsaturated Al penta 3 + (about 22.6%). XAS confirms that Pt NPs deposited on the surface of Al 2 O 3 with rich unsaturated pentahedral coordinated Al 3+ sites have a unique coordination structure at the interface (more Pt-O coordination). When catalyzing the CO oxidation as a probe reaction, the catalytic activity and the particle sizes of Pt NPs do not change significantly even after the reaction at 400 °C for 15 days, and the complete CO conversion temperature increases only by 40 °C when the catalyst is screened at 600 °C for 5 days. This work demonstrates a new strategy to develop stable large-scale anti-sintering noble metal-based heterogeneous catalysts for many important high-temperature industrial applications.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2021
·
IF 13.084
Jiayu Ma,Xianjun Tan,Qingqing Zhang,Yan Wang,Jinlong Zhang,Lingzhi Wang
The high inertness of the C–H bond makes the photocatalytic methane conversion a significant challenge. The platinum nanoparticle is a promising cocatalyst for CH4 activation, while the study of its structure characteristics and functionality remains in its infancy. Herein, the size effect of Pt on the photocatalytic nonoxidative methane conversion efficiency was systematically investigated over x-Pt/Ga2O3 with the particle size (x) ranging from 1.5 to 2.7 nm, where a volcano-shaped relation was observed. The smaller size is beneficial to the formation of Ptδ+ species, which is mainly distributed on the terrace sites according to the DFT calculation. The corner Pt atom is the geometric active site for the CH4 polarization, and the terrace Ptδ+ helps promote C–H activation since the activity is decreased on reduced x-Pt/Ga2O3 with a lower Ptδ+ content. Meanwhile, Ptδ+ species favors the oxidation of adsorbed −CH3 group to ·CH3. The volcano-shaped size effect on the NOCM activity was finally rationalized by the balance between C–H activation and C2H6 desorption from the corner sites on different sized Pt.
研究领域:
化学
·
材料科学
·
催化反应
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Donglei Mao,Jianhao Qiu,Mingmin Jia,Xiong-Fei Zhang,Jianfeng Yao
Porous carbon was prepared through a simple and efficient method using microcrystalline cellulose as carbon source. Compared with pristine carbon (C-1), nitric acid treated carbon (C-2) has more acidic oxygen-containing groups on its surface (acid density: 0.14 mmol/g for C-1 and 2.13 mmol/g for C-2). Pt supported Pt/C-2 behaves a substantially enhanced catalytic oxidation activity of benzyl alcohol (conversion of 71.7%) compared with Pt/C-1(conversion of 37.2%) under the same conditions. Further characterizations and experiments indicate that the excellent dispersion of Pt nanoparticles and strong hydrogen bonding interaction between benzyl alcohol and Pt/C-2 are crucial for the enhanced catalytic activity. Our experimental results also show that mild temperature (60 °C) and non-polar solvents are more beneficial for the reaction, and O 2 atmosphere is a necessity for benzyl alcohol oxidation.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 47
·18685-18694
·
IF 3.069
Rui-Xue Liu,Ying-Shu Wu,Yan-Cheng Liu,Ru-Yi Luo,Li-Dong Yang,Meng-Ting Tang,Zhen-Feng Chen,Hong Liang
Based on the characteristic anthrahydrazone pharmacophore, two new anthrahydrazone derivatives (9-PMAH and APMAH) were synthesized, which further afforded two corresponding cisplatin-like Pt(II) complexes (9-PMAH-Pt and APMAH-Pt). Their chemical structures were characterized by IR, ESI-MS, elemental analysis and X-ray single crystal diffraction method. Their in vitro cytotoxicity towards a series of human tumor cell lines and the normal liver cell line HL-7702 were screened and shown in IC50 values and compared with that of cisplatin. 9-PMAH-Pt showed higher cytotoxicity against MGC-803 and HepG-2 than the other tested compounds including cisplatin, while it showed lower toxicity on HL-7702 than cisplatin. The structure–activity relationship from the in vitro cytotoxicity study indicated that the substitution of –CHO on the opposite C10 of anthrahydrazone was unfavorable to higher cytotoxicity, which might be due to its steric hindrance considering the planar aromatic anthracene. Further studies demonstrated that 9-PMAH-Pt induced cell apoptosis in both MGC-803 and T-24 cells by arresting the cell cycle at the G2/M phase, which was totally different for cisplatin, suggesting the different antitumor efficacies of this platinum complex and cisplatin. On the molecular level, it was suggested that 9-PMAH-Pt could bind with DNA via an intercalative mode, likely competing with GelRed in similar intercalative binding sites. 9-PMAH-Pt also effectively inhibited the activity of TOPO I, acting as a TOPO I suppressor. The results of this work suggest a new type of platinum complex bearing anthrahydrazone ligands to form a new bifunctional antitumor candidate in comparison with the classic platinum drugs.
研究领域:
药物化学
·
肿瘤学
·
分子生物学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2021
·
IF 5.875
Zixu Liu,Wei Chu,Qianhe Sun,Linxuan Zhao,Xinyi Tan,Yu Zhang,Tian Yin,Haibing He,Jingxin Gou,Xing Tang
Combination, synergistic chemotherapy with gemcitabine (GEM) and cisplatin (CDDP) is a common strategy, and has been recommended for tumor treatment due to its promoted therapeutic effect and reduced systemic toxicity. However, this process involves the intravenous infusion of GEM prior to that of CDDP, which is inconvenient for patients and staff. Here, a novel hybrid nano-carrier system comprised of micelles encapsulated within PEGylated liposomes is proposed, in order to combine the unique strengths of each component. CDDP was bonded with PLG-PEG, and then the formed CDDP@PLG-PEG micelles and GEM were co-loaded inside PEGylated liposomes. The hybrid liposomes with the optimized GEM/CDDP ratio (1:0.6) showed a roughly spherical morphology, appropriate drug loading, and sustained release behavior. In vitro, the hybrid liposomes had 1.72-fold increased cellular uptake, and 57.42%-fold decreased IC 50 value. In vivo , pharmacokinetic studies showed increased t 1/2 values (125.64%- and 128.57%-folds for GEM and CDDP), decreased clearance (41.90%- and 2.37%-folds), and promoted AUC (262.76%- and 4577.24%-folds). Finally, an in vivo antitumor study showed effective activity in regards to lung tumor size and weight, which were 40.48%- and 33.11%-folds that of GEM/CDDP solution. In summary, we demonstrated the development of an effective micelle-containing PEGylated hybrid liposomes for combined GEM/CDDP delivery.
研究领域:
药剂学
·
肿瘤学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2017
·
IF 3.473
Yang Liu,Zhensheng Li,Li Chen,Zhigang Xie
Near-infrared (NIR) multifunctional BODIPY-Platinum (BODIPY-Pt) conjugates were synthesized, which compose of fluorescent borondipyrromethene (BODIPY) dyes and therapeutic agents of cisplatin. BODIPY-Pt conjugates combined the NIR imaging, photodynamic therapy (PDT) and chemotherapy in one. BODIPY-Pt possesses the excellent phototoxicity at low concentration upon radiation and comparable chemotherapeutic toxicity with cisplatin. The cellular uptake and distribution were validated by confocal laser scanning microscopy . In addition, the in vivo studies on bearing U14 tumor-bearing mice demonstrated that the BODIPY-Pt conjugates simultaneously keep the fluorescent imaging and antitumor effect.
研究领域:
药理学
·
生物医学工程
·
肿瘤学
✓ 已验证
DOI
高影响因子
Frontiers in Pharmacology
·
2022
·
IF 5.988
Shi Le,Shu Yang,Hu Xiangdong,Akram Waheed,Wang Jun,Dong Shuang,Luo Biaobiao,Zhang Jiuliang,Hu Sheng,Li Xiaohua,Hu Xuebo
Chemotherapy is considered a most effective way to treat cancer. However, it is very common that chemotherapy causes unbearable mental and physical side effects to cancer patients, which ultimately reduces the patients’ confidence of overcoming diseases and compromises the treatment of chemotherapy. Cisplatin (DDP), a widely used anticancer agent for various types of cancers, also damages nontumor cells and tissues, which are mostly related to the activation of the inflammation pathway. Previously, we have discovered a few rational formulas of food as medicine materials that reduced systemic inflammation in in vitro and in vivo models. Hence, this study reports the ability of an optimized traditional Chinese anti-inflammatory formulation capable of synergizing the antitumor effect of DDP in vitro and in vivo. More significantly, by formulation of two anti-inflammatory herbal medicine, the Chrysanthemum × morifolium (Ramat.) Hemsl [Asteraceae] and Lonicera japonica Thunb [Caprifoliaceae] with a mediator Glycyrrhiza uralensis Fisch. ex DC [Fabaceae], a best formula relieved the kidney damage imposed by DDP. Treatments of various combinations of major chemical components of the three herbs also exhibited a similar trend for lowering the DDP-induced nephrotoxicity; however, contrary to that of the formula of herbal extracts, all chemical formulas could not recover the body weight and food intake of the tumor-bearing mice treated by DDP. Our findings suggested that the therapeutic index of DDP-based chemotherapy was able to be improved by minimizing toxicities from the two-herb formula to inhibit the inflammation in mouse tumor models and DDP-induced acute kidney injury mouse models.
研究领域:
肿瘤学
·
药理学
·
中医药学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
Nano Research
·
2020
·Vol. 13
·期 7
·1920-1927
·
IF 8.183
Chan Yat Tung,Siddharth Kumar,Shao Minhua
As a promising fuel candidate, ammonia has been successfully used as anode feed in alkaline fuel cells. However, current technology in catalysts for ammonia electro-oxidation reaction (AOR) with respect to both cost and performance is inadequate to ensure large scale commercial application of direct ammonia fuel cells. Recent studies found that alloying Pt with different transition metals and controlling the morphology of catalysts can improve the AOR activity, and thus potentially can solve the cost issue. Herein, (100)-terminated Pt-M nanocubes (M = 3d-transition metals Fe, Co, Ni, Zn) are synthesized via wet-chemistry method and their catalytic activities toward AOR are evaluated. The addition of Fe, Co, Ni and Zn elements can enhance the AOR activity due to decrease in oxophilicity of platinum and bifunctional mechanism. Pt-Zn exhibits the maximum mass activity and specific activity with values of 0.41 A/mg Pt and 1.69 mA/cm 2 that are 1.6 and 1.8 times higher than Pt nanocubes, respectively. Pt-Fe, Pt-Co and Pt-Ni nanocubes also illustrate higher mass and specific activities compared to Pt nanocubes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
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