Tag: M.W=150-200

Long, Yangke published the artcilePeroxymonosulfate activation for pollutants degradation by Fe-N-codoped carbonaceous catalyst: Structure-dependent performance and mechanism insight, Related Products of piperidines, the publication is Chemical Engineering Journal (Amsterdam, Netherlands) (2019), 542-552, database is CAplus.

In this study, Fe-N-codoped carbonaceous catalysts (Fe-N-C-x) with different structures including one-dimensional carbon nanotubes (1D CNTs) and two-dimensional porous carbon sheets (2D NC) to three-dimensional carbon nanotubes/porous carbon sheets composites (3D CNTs/NC) were systematically synthesized and applied as peroxymonosulfate (PMS) activators. It was found that the Fe-N-C-x catalysts exhibited structure-dependent catalytic performance, following the order of 2D NC > 3D CNTs/NC > 1D CNTs, and also substrate-dependent degradation performance that the reaction kinetics varied greatly for different organic pollutants. Benefiting from the unique structure characteristic and high d. of active sites, 2D Fe-N-C-1 showed far superior catalytic performance than the generally used carbocatalysts with negligible Fe leaching. Besides, various influential factors affecting the catalytic performance were systematically investigated. Fe-N-C-1 showed high catalytic efficiencies toward a broad spectrum of organic pollutants, and it was confirmed that both radical and non-radical degradation pathways existed during pollutants degradation The competitive radical quenching tests and ESR measurements verified that the superoxide anion radical (O^A·-₂) was the primary reactive oxidized species for degradation of p-chlorophenol (4-CP). The chronoamperometry anal. demonstrated that Fe-N-C-1 facilitated the electron transfer from 4-CP to PMS, resulting in the degradation of 4-CP through a non-radical mechanism. Our result not only reveals the structure-dependent PMS activation performance of transition-metal and nitrogen codoped carbocatalysts but also provides solid evidence that the defect-rich carbon materials with amorphous carbon and partial graphitic structure also favor the electron transfer mechanism.

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about 826-36-8. 826-36-8 belongs to piperidines, auxiliary class Natural product, name is 2,2,6,6-Tetramethylpiperidin-4-one, and the molecular formula is C9H17NO, Related Products of piperidines.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Shen, Minxian published the artcileActivation of persulfate for tetracycline degradation using the catalyst regenerated from Fenton sludge containing heavy metal: Synergistic effect of Cu for catalysis, Formula: C9H17NO, the publication is Chemical Engineering Journal (Amsterdam, Netherlands) (2020), 125238, database is CAplus.

Fenton reaction is widely used as a unique oxidation method for industrial wastewater treatment; however, it generates a massive amount of Fe sludge, which mostly contains other hazardous heavy metal wastes which can harm the environment and humans. This work proposed a sustainable method to eliminate side effects of the Fenton reaction and to transform Cu-containing Fenton sludge into an efficient catalyst for peroxymonosulfate (PMS) activation for tetracycline (TC) degradation The existence of Cu, which can increase sludge O₂ vacancies, was attributed to the activation efficiency compared to Fe sludge with no Cu. X-ray diffraction and XPS results showed Fe is present as α-Fe₂O₃ and γ-Fe₂O₃; Cu mostly exists as Cu²⁺. Catalyst and PMS doses, pH, and recycling time effect on PMS reaction was illustrated. OH^–, SO₄^– O₂^–, and ¹O₂ were the critical reactive oxygen species. TC decomposes into CO₂ and water through six possible pathway processes with these free radicals. Given its sustainable treatment and high catalytic efficiency, dealing with Fe sludge which contains heavy metals serves as a modal practice for harmful wastewater treatment and can be popularized for broader applications.

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about 826-36-8. 826-36-8 belongs to piperidines, auxiliary class Natural product, name is 2,2,6,6-Tetramethylpiperidin-4-one, and the molecular formula is C3H5F3O, Formula: C9H17NO.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Ohira, Kazuki published the artcileDevelopment of phenazine-2,3-diol-based photosensitizers: effect of formyl groups on singlet oxygen generation, Quality Control of 826-36-8, the publication is Materials Chemistry Frontiers (2021), 5(14), 5298-5304, database is CAplus.

Phenazine-2,3-diol derivatives KO-0-3, which have zero to three formyl groups, resp., have been developed as photosensitizers (PSs) possessing the ability to generate singlet oxygen (1O2). The photoabsorption bands of KO-0-3 are significantly red-shifted compared to those of phenazine-2,3-MOM (methoxymethyl) derivatives 5-8, whose hydroxy and formyl groups are protected, and have onsets at around 600-650 nm. Furthermore, the fluorescence quantum yields (Φfl) of KO-0-3 (Φfl = 0.024-0.097) are lower than those of 5-8 (Φfl = 0.34-0.46) in solution To gain insight into the 1O2 generation properties of KO-0-3, we evaluated the 1O2 quantum yields (ΦΔ) and rate constants (kobs), and demonstrated that KO-1-3 possess a higher ability to generate 1O2 under visible light irradiation than those of 5-8. Moreover, it was found that the ΦΔ values of KO-0-3 increase in the order of KO-0 (0.036) < KO-1 (0.22) < KO-2 (0.33) < KO-3 (0.41) with increasing number of formyl groups. This result indicates that formyl groups facilitate the intersystem crossing (ISC) from the lowest singlet excited states of the PSs (S1) to the triplet excited states (Tn) according to El-Sayed′s rule. Consequently, this work provides useful knowledge in mol. design of efficient phenazine-2,3-diol-based PSs for photodynamic therapy (PDT).

Materials Chemistry Frontiers published new progress about 826-36-8. 826-36-8 belongs to piperidines, auxiliary class Natural product, name is 2,2,6,6-Tetramethylpiperidin-4-one, and the molecular formula is C9H17NO, Quality Control of 826-36-8.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Vastyl, Michal published the artcileA case study on microwave pyrolysis of waste tyres and cocoa pod husk; effect on quantity and quality of utilizable products, HPLC of Formula: 826-36-8, the publication is Journal of Environmental Chemical Engineering (2022), 10(1), 106917, database is CAplus.

Disposal of huge amounts of diverse wastes for reduced costs accompanied with gaining of energy and valuable chems. is an eager topic in waste-to-energy and fuel business. Microwave pyrolysis is a thermochem. route providing such benefits. Waste scrap tyres (ST) and cocoa pod husk (CPH) as polymer and biomass representatives were pyrolyzed in microwave reactor at 440 W power for 30 min. Quantity and quality of pyrolysis products (gas, oil, and carbon black) were investigated. It was revealed, while set microwave pyrolysis conditions are sufficient for maximum decomposition of ST to pyrolysis products, it is necessary to optimize them for CPH. The gas produced by microwave pyrolysis of ST contains more H2 and CH4 than from conventional pyrolysis, thus, microwave pyrolysis is an effective tool for production of a fuel gas. The oil obtained by ST microwave pyrolysis is a complex mixture of mostly nonpolar aromatic compounds (toluene, benzene, limonene, styrene, o-xylene), while the oil obtained by CPH microwave pyrolysis contains mainly p-cresol, phenol and its derivatives The ST-derived carbon black shows a well-established large-volume mesoporous-macroporous structure. The CPH-derived carbon black is a low-volume macroporous material with very well-developed microporosity. A higher gross calorific value of microwave ST-derived carbon black in comparison to conventionally prepared one is caused by its higher graphitization rate. Since the surface of ST-derived carbon black is more polar than CPH-derived one and with respect to chem. purity, it could be more suitable adsorbent for polar volatile organic compounds from gaseous emissions. It is necessary to develop a microporosity in ST-derived carbon black.

Journal of Environmental Chemical Engineering published new progress about 826-36-8. 826-36-8 belongs to piperidines, auxiliary class Natural product, name is 2,2,6,6-Tetramethylpiperidin-4-one, and the molecular formula is C11H9ClN2O, HPLC of Formula: 826-36-8.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Wang, Yi published the artcileActivation of peroxydisulfate using N-doped carbon-encapsulated Ni species for efficient degradation of tetracycline, Computed Properties of 826-36-8, the publication is Separation and Purification Technology (2021), 119369, database is CAplus.

In this study, N-doped porous carbon materials embedded with NiNx species (Ni@NC) were fabricated via the pyrolysis of Ni-doped zeolitic imidazolate frameworks-8 (ZIF-8) at the temperature of 900°C. The obtained Ni@NC-1 catalyst exhibited excellent activity in activating the peroxydisulfate (PDS) that was used for removing tetracycline (TC). The catalytic system exhibited good stability, wide pH adaptation, and high resistance to the operational environment. It was supposed that NiNx species could attach to PDS and act as electron acceptors to receive the electrons for activating the PDS, thus generating highly reactive superoxide radicals (·O-2) and singlet oxygen (1O2) species for rapid degradation of TC. The electron transfer and dissolved oxygen-derived ·O-2 were also responsible for the degradation of TC. In addition, the Ni@NC-1/PDS system exhibited high efficiency for removing oxytetracycline, ciprofloxacin, or levofloxacin. The results of this study would promote the design of other MOFs-derived carbon-encapsulated metal species for efficiently activating persulfate to remove antibiotics from the wastewater.

Separation and Purification Technology published new progress about 826-36-8. 826-36-8 belongs to piperidines, auxiliary class Natural product, name is 2,2,6,6-Tetramethylpiperidin-4-one, and the molecular formula is C7H7IN2O, Computed Properties of 826-36-8.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Mao, Shuhua published the artcile(RuBpy₃)²⁺-bisterpyridinyl triangle promoted singlet oxygen (¹O₂) photosensitization for fast oxidation of sulfur mustard simulant, Quality Control of 826-36-8, the publication is Inorganic Chemistry Communications (2022), 109090, database is CAplus.

(RuBpy₃)²⁺-bisterpyridine-based metallacycle T photosensitizer was prepared by a facile single-step self-assembly process. Supramol. self-assembly strategy greatly improved metallacycle T’s photosensitized ability due to its enhanced light-harvesting capability, smaller energy gap (ΔE_ST) between lowest excited singlet state (S1) and lowest excited triplet state (T1) along with excellent solubility which exhibiting higher efficiency for singlet oxygen (¹O₂) production than the ligand L and its pendant [(RuBpy₃)²⁺·2PF₆^–]. In the practical photo-driven degradation of sulfur mustard simulant (2-chloroethyl Et sulfide, CEES), full conversion of toxic CEES to nontoxic CEESO was achieved by metallacycle T with an extremely fast lifetime of 90 s (half lifetime t_1/2 = 25 s) and 100% selectivity (without formation of highly toxic CEESO₂), while ligand L and [(RuBpy₃)²⁺·2PF₆^–] needed 130 s and 330 s, resp. This study demonstrated terpyridine-based novel supermols. can serve as efficient scaffolds for effective enhancement of photosensitization.

Inorganic Chemistry Communications published new progress about 826-36-8. 826-36-8 belongs to piperidines, auxiliary class Natural product, name is 2,2,6,6-Tetramethylpiperidin-4-one, and the molecular formula is C9H17NO, Quality Control of 826-36-8.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Ge, Teng published the artcileGiant enhanced photocatalytic H₂O₂ production over hollow hexagonal prisms carbon nitride, Category: piperidines, the publication is Journal of the Taiwan Institute of Chemical Engineers (2021), 104-111, database is CAplus.

H2O2, as a green and environmentally friendly oxidant, has been widely used in our daily life and industrial production It is of epoch-making significance to develop highly efficient photocatalysts for producing H2O2. In recent years, g-C3N4 has received much attention due to its high chem. stability, environmental friendliness and suitable energy band structure. However, some shortcomings including the fast recombination of photogenerated electron-hole pairs and small sp. surface area in traditional 2D g-C3N4 seriously impede its photocatalytic performance for the production of H2O2.1D hollow nanostructures possess intriguing physicochem. properties and are adopted to overcome the intrinsic shortcomings of g-C3N4. Herein, g-C3N4 with a hollow hexagonal prism structure (CN-HP) is prepared to produce H2O2. It is characterized by XRD, XPS, SEM, HRTEM, ESR and DRS. BET, PL spectra, photocurrent and EIS are used to explain the enhanced photocatalytic performance. Compared with traditional 2D g-C3N4, the sp. surface area of CN-HP increases to 41.513 m²/g, providing more active sites. Meanwhile, its hollow tubular structure can enhance the migration of photogenerated electrons to the catalyst surface, and electrons with a longer lifetime can participate in photocatalytic reactions to achieve high efficiency. The yield of H2O2 production can up to 4.08 μmol over CN-HP in 40 min, which is about 7 times higher than that of traditional 2D g-C3N4, and the apparent quantum efficiency (AQE) of H2O2 production at 420 nm is 2.41%. This research provides a valuable reference for the development of green materials for efficient photocatalytic production of H2O2.

Journal of the Taiwan Institute of Chemical Engineers published new progress about 826-36-8. 826-36-8 belongs to piperidines, auxiliary class Natural product, name is 2,2,6,6-Tetramethylpiperidin-4-one, and the molecular formula is C9H17NO, Category: piperidines.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Yu, Valentina K. published the artcileSynthesis and properties of novel alkoxy- and phenoxyalkyl ethers of secondary and tertiary ethynylpiperidin-4-ols possessing unusual analgesic, anti-bacterial, anti-spasmotic, and anti-allergic properties as well as low toxicity, HPLC of Formula: 512778-95-9, the publication is Journal of Saudi Chemical Society (2009), 13(2), 209-217, database is CAplus.

Methodol. was developed to obtain a series of unusual alkoxy- and phenoxyalkyl ethers of secondary and tertiary ethynylpiperidin-4-ols, representative examples of which were evaluated for analgesic, anti-bacterial, anti-spasmotic, and anti-allergic activity. Twenty-two new compounds were prepared and identified by elemental and spectral analyses. Etherification of 4-hydroxypiperidin-4-ols was accomplished via Williamson ether-type syntheses in dry DMF. Side reactions of the bromides used appeared to involve complex processes with DMF under a variety of conditions employed which led to modest yields of products. Since all target mols. were oils at room temperature, conversions to β-cyclodextrins were accomplished and served as vehicles for pharmacol. screening. Several ethynyl-substituted agents displayed deep analgesic activity in the tail flick model, although some alkoxy- and phenoxy ethers from secondary alcs. were less effective as analgesics. Interestingly, LD50 values for the agents exceeded that of a number of clin. agents including Dimedrole, Klemastine, Lidocaine, No-spa, Tramal, Streptomycin, and Euphilline. Three representative examples of the agents exhibited moderate anti-bacterial action against Escherichia coli, Salmonella chloerae suis, Salmonella typhimurium, and Staphylococcus aureus, but did not exceed that of Streptomycin. The absence of the ethynyl ether group resulted in no anti-bacterial activity in several ethers. A few agents possessed anti-spasmotic ability, especially the ethers of 1-(2-ethoxyethyl)-4-ethynyl-4-hydroxypiperidines in various preparations and included the systems of acetylcholine-induced spasms, the histamine-induced spasms, and the calcium chloride-induced spasms. Two examples void of the ethynyl group were not effective as anti-spasmotic compounds A small survey of five agents for anti-allergic properties revealed that two with ethynyl groups were similar in activity with Dimedrole but less than that of Klemastine in screens using acetylcholine and histamine systems. Overall, these families of piperidines possess a wide variety of important biol. properties which require further exploration.

Journal of Saudi Chemical Society published new progress about 512778-95-9. 512778-95-9 belongs to piperidines, auxiliary class Piperidine,Alcohol,Ether, name is 1-(2-Methoxyethyl)piperidin-4-ol, and the molecular formula is C11H15NO2, HPLC of Formula: 512778-95-9.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem