scholarly journals Hydrodechlorination of 4-Chlorophenol on Pd-Fe Catalysts on Mesoporous ZrO2SiO2 Support

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 141
Author(s):  
Ekaterina S. Lokteva ◽  
Vera V. Shishova ◽  
Nikolay N. Tolkachev ◽  
Andrey N. Kharlanov ◽  
Konstantin I. Maslakov ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Bimetallic Catalyst ◽  
Environmental Pollutant ◽  
High Dispersion ◽  
Drift Spectroscopy ◽  
Phenol Solution ◽  
Time Treatment ◽  
Excellent Activity ◽  
Mesoporous Support ◽  
Short Time

A mesoporous support based on silica and zirconia (ZS) was used to prepare monometallic 1 wt% Pd/ZS, 10 wt% Fe/ZS, and bimetallic FePd/ZS catalysts. The catalysts were characterized by TPR-H2, XRD, SEM-EDS, TEM, AAS, and DRIFT spectroscopy of adsorbed CO after H2 reduction in situ and tested in hydrodechlorination of environmental pollutant 4-chlorophelol in aqueous solution at 30 °C. The bimetallic catalyst demonstrated an excellent activity, selectivity to phenol and stability in 10 consecutive runs. FePd/ZS has exceptional reducibility due to the high dispersion of palladium and strong interaction between FeOx and palladium, confirmed by TPR-H2, DRIFT spectroscopy, XRD, and TEM. Its reduction occurs during short-time treatment with hydrogen in an aqueous solution at RT. The Pd/ZS was more resistant to reduction but can be activated by aqueous phenol solution and H2. The study by DRIFT spectroscopy of CO adsorbed on Pd/ZS reduced in harsh (H2, 330 °C), medium (H2, 200 °C) and mild conditions (H2 + aqueous solution of phenol) helped to identify the reasons of the reducing action of phenol solution. It was found that phenol provided fast transformation of Pd+ to Pd0. Pd/ZS also can serve as an active and stable catalyst for 4-PhCl transformation to phenol after proper reduction.

scholarly journals Therapeutic Concentrations of Mitotane (o,p′-DDD) Inhibit Thyrotroph Cell Viability and TSH Expression and Secretion in a Mouse Cell Line Model

Endocrinology ◽  
2010 ◽  
Vol 151 (6) ◽  
pp. 2453-2461 ◽  
Author(s):  
Maria Chiara Zatelli ◽  
Erica Gentilin ◽  
Fulvia Daffara ◽  
Federico Tagliati ◽  
Giuseppe Reimondo ◽  
...  
Keyword(s):  
Thyroid Hormone ◽  
Cell Viability ◽  
Cell Line ◽  
Secretory Activity ◽  
Mouse Cell ◽  
Therapeutic Window ◽  
Free T4 ◽  
Central Hypothyroidism ◽  
Time Treatment ◽  
Short Time

Mitotane therapy is associated with many side effects, including thyroid function perturbations mimicking central hypothyroidism, possibly due to laboratory test interference or pituitary direct effects of mitotane. We investigated whether increasing concentrations of mitotane in the therapeutic range might interfere with thyroid hormone assays and evaluated the effects of mitotane on a mouse TSH-producing pituitary cell line. TSH, free T4, and free T3 levels do not significantly change in sera from hypo-, hyper-, or euthyroid patients after addition of mitotane at concentrations in the therapeutic window. In the mouse TαT1 cell line, mitotane inhibits both TSH expression and secretion, blocks TSH response to TRH, and reduces cell viability, inducing apoptosis at concentrations in the therapeutic window. TRH is not capable of rescuing TαT1 cells from the inhibitory effects of mitotane on TSH expression and secretion, which appear after short time treatment and persist over time. Our results demonstrate that mitotane does not interfere with thyroid hormone laboratory tests but directly reduces both secretory activity and cell viability on pituitary TSH-secreting mouse cells. These data represent a possible explanation of the biochemical picture consistent with central hypothyroidism in patients undergoing mitotane therapy and open new perspectives on the direct pituitary effects of this drug.

Immobilizing AgPd alloy on Vulcan XC-72 carbon: a novel catalyst for highly efficient hydrogen generation from formaldehyde aqueous solution

RSC Advances ◽  
2016 ◽  
Vol 6 (107) ◽  
pp. 105638-105643 ◽  
Author(s):  
Shutao Gao ◽  
Tao Feng ◽  
Qiuhua Wu ◽  
Cheng Feng ◽  
Ningzhao Shang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Room Temperature ◽  
Hydrogen Generation ◽  
Bimetallic Catalyst ◽  
Highly Efficient ◽  
Novel Catalyst ◽  
First Time

A novel bimetallic catalyst, AgPd nanoalloy supported on Vulcan XC-72 carbon (AgPd@C-72), has been successfully fabricated and used for catalyzing H2 generation from formaldehyde aqueous solution at room temperature for the first time.

scholarly journals Applications of sand roasting and baking in the preparation of traditional Indian snacks: nutritional and antioxidant status

2019 ◽  
Vol 43 (1) ◽  
Author(s):  
Aruna Jyothi Kora
Keyword(s):  
Dietary Fiber ◽  
Value Added ◽  
Cost Effective ◽  
Protein Digestibility ◽  
Working Environment ◽  
Time Treatment ◽  
High Temperature Short Time ◽  
Tamarind Kernel ◽  
Short Time ◽  
Sand Roasting

Abstract Background In India, the sand roasting technique is widely used by street food vendors, villagers and cottage industries for making various value-added food products from different cereals, millets and legumes. The traditionally produced sand-roasted products are commonly utilized as ready to eat snacks or for the preparation of various other snacks. Results During the high-temperature short-time treatment of sand roasting, the produced products are bestowed with characteristics such as higher puffing, crispiness, volume, and improved color, aroma, flavor and texture. In terms of nutrition, the roasting process enhances the carbohydrate and protein digestibility, β-glucan extractability, levels of dietary fiber, minerals, and antioxidants and reduces the inherent antinutrients levels in cereals and legumes. In addition, the complete destruction of seed microflora enhances the shelf life and thus consumer acceptance. The sand-roasted products act as prebiotic dietary fiber and serves as an alternative to polished grains for the consumers. Thus, the simplest, inexpensive, traditional sand roasting method of dry heat application is used for making precooked ready to eat weaning foods and preparation of cost-effective dietary pediatric and geriatric formulations. The technique is also employed for roasting various beans, fryums, nut, and pulse decortication and as a pretreatment process for tamarind kernel powder production, while the sand baking method is widely used for baking cakes, vegetables, meat, fish, eggs and starchy tubers. Conclusions The techniques of sand roasting and baking are gaining importance as cheap, effective, oil-free, healthier ways of cooking. However, further studies are needed on micronutrient availability and functional food development for community nutritional disorders. Also, the residual silica levels and difficult working environment mandates the development of energy-efficient and high-output-orientated technologies such as continuous, microwave, and fluidized bed roasters.

scholarly journals AuNPs-Based Thermoresponsive Nanoreactor as an Efficient Catalyst for the Reduction of 4-Nitrophenol

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 963
Author(s):  
Wei Liu ◽  
Xiaolian Zhu ◽  
Chengcheng Xu ◽  
Zhao Dai ◽  
Zhaohui Meng
Keyword(s):  
Aqueous Solution ◽  
Electron Transfer ◽  
Phase Transformation ◽  
Catalytic Activity ◽  
Catalytic Efficiency ◽  
Environmental Pollutant ◽  
Temperature Sensitive ◽  
Efficient Catalyst ◽  
Catalytic Rate ◽  
Silica Core

A new AuNPs-based thermosensitive nanoreactor (SiO2@PMBA@Au@PNIPAM) was designed and prepared by stabilizing AuNPs in the layer of poly(N,N’-methylenebisacrylamide) (PMBA) and subsequent wrapping with the temperature-sensitive poly(N-isopropylacrylamide) (PNIPAM) layer. The new nanoreactor exhibited high dispersibility and stability in aqueous solution and effectively prevented the aggregation of AuNPs caused by the phase transformation of PNIPAM. The XPS and ATR-FTIR results indicated that AuNPs could be well stabilized by PMBA due to the electron transfer between the N atoms of amide groups in the PMBA and Au atoms of AuNPs. The catalytic activity and thermoresponsive property of the new nanoreactor were invested by the reduction of the environmental pollutant, 4-nitrophenol (4-NP), with NaBH4 as a reductant. It exhibited a higher catalytic activity at 20 °C and 30 °C (below LCST of PNIPAM), but an inhibited catalytic activity at 40 °C (above LCST of PNIPAM). The PNIPAM layer played a switching role in controlling the catalytic rate by altering the reaction temperature. In addition, this nanoreactor showed an easily recyclable property due to the existence of a silica core and also preserved a rather high catalytic efficiency after 16 times of recycling.

scholarly journals Construction of Cu–Ce/graphene catalysts via a one-step hydrothermal method and their excellent CO catalytic oxidation performance

RSC Advances ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 1583-1592 ◽  
Author(s):  
Yinshuang Zhao ◽  
Fang Dong ◽  
Weiliang Han ◽  
Haijun Zhao ◽  
Zhicheng Tang
Keyword(s):  
Catalytic Oxidation ◽  
Hydrothermal Method ◽  
Metal Particles ◽  
High Dispersion ◽  
Excellent Activity ◽  
Co Catalytic Oxidation ◽  
Oxidation Performance ◽  
One Step

Cu–Ce/graphene catalysts show high dispersion of metal particles and excellent activity and stability for catalytic oxidation.

scholarly journals High-Temperature Short-Time Treatment of Human Milk for Bacterial Count Reduction

2018 ◽  
Vol 6 ◽  
Author(s):  
Daniel Klotz ◽  
Marie Schreiner ◽  
Valeria Falcone ◽  
Daniel Jonas ◽  
Mirjam Kunze ◽  
...  
Keyword(s):  
High Temperature ◽  
Human Milk ◽  
Bacterial Count ◽  
Time Treatment ◽  
High Temperature Short Time ◽  
Short Time

Fabrication of Arrays of Zinc Oxide Micro/Nano Pillars in Aqueous Solution under an External Electric Current

2010 ◽  
Vol 123-125 ◽  
pp. 679-682
Author(s):  
Gang Qiang Yang ◽  
Xiao Ping Zou ◽  
Xiang Min Meng ◽  
Gong Qing Teng
Keyword(s):  
Aqueous Solution ◽  
Zinc Oxide ◽  
Electric Current ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Solution Route ◽  
Short Time

Arrays of zinc oxide (ZnO) micro/nano pillars have been synthesized on indium-tin-oxide (ITO) substrates by a solution route under an external electric current. They were pillar-like morphologies and grew along the c-axis. Some comparative experiments showed that applying the external electric current effectively improved the alignment of the product in a short time. It was indicated that the micro/nano pillars can be obtained in a short time under an external electric current.

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