Tag: M.W=150-200

Wang, Yujiao published the artcileFeOx@graphitic carbon core-shell embedded in microporous N-doped biochar activated peroxydisulfate for removal of Bisphenol A: Multiple active sites induced non-radical/radical mechanism, Formula: C9H17NO, the publication is Chemical Engineering Journal (Amsterdam, Netherlands) (2022), 135552, database is CAplus.

The development of novel carbocatalysts with high activity and stability is important for the rapid degradation of emerging pollutants. Fe/N co-doped biochar (FeOx@GC-NBC) was innovatively synthesized with a pyrolytic carbonization method and then used as a functional peroxydisulfate (PDS) activator to degrade Bisphenol A (BPA). FeOx@GC-NBC with an optimized Fe/N ratio modification exhibited 23.16 and 8.65-fold great activity for BPA removal compared to pristine BC and N-doped BC, resp. Approx. 93% of total organic carbon (TOC) could be removed in the heterogeneous activation system. We attributed the excellent performance of FeOx@GC-NBC to the following attributes: i) a microporous carbon matrix with larger sp. surface area (1691.81 m²·g^-1) was favorable for adsorption, exposure of catalyst active sites (e.g., Fe-Nx, Graphitic N) and electron-transfer; ii) the C-O-Fe bond and highly core-shell structure of graphitic nanosheets (FeOx@GC) enhanced the N retention ability and durability of the catalyst; iii) organics adsorption dominated by a “pore-filling and π-π interaction” mechanism effectively promoted BPA oxidation In acidic and neutral solutions, the radical oxidation (SO·-4and ·OH) processes were responsible for BPA decomposition In alk. solution, electron transfer, instead of 1O2 or a high-valent iron species, was the dominant pathway. This study proposes a simple and feasible strategy to synthesize the FeOx@GC-NBC catalyst, which provides insights into catalyst design and the internal active sites involved in the purification mechanism of refractory organics

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 C22H23ClN4, Formula: C9H17NO.

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

He, Yuan published the artcileCatalytic ozonation for metoprolol and ibuprofen removal over different MnO₂ nanocrystals: Efficiency, transformation and mechanism, Formula: C9H17NO, the publication is Science of the Total Environment (2021), 147328, database is CAplus and MEDLINE.

Manganese dioxide has been widely recognized as catalyst in catalytic ozonation for organic pollutants removal from wastewater in recent decades. However, few studies focus on the structure-activity relationship of MnO₂ and catalytic ozonation mechanism in water. In the present study, the oxidative reactivity of three different crystal phases of MnO₂ corresponding to α-MnO₂, β-MnO₂ and γ-MnO₂ towards metoprolol (MET) and ibuprofen (IBU) were evaluated. α-MnO₂ was found to contain the most abundant oxygen vacancy and readily reducible surface adsorbed oxygen (O^2-, O^–, OH^–), which facilitated an increase of ozone utilization and the highest catalytic performance with 99% degradation efficiency for IBU and MET. α-MnO₂ was then selected to investigate the optimum key operating parameters with a result of catalyst dosage 0.1 g/L, ozone dosage 1 mg/min and an initial pH 7. The introduction of α-MnO₂ promoted reactive oxygen species (O^2-, O^–, OH^–) generation which played significant roles in IBU degradation Probable degradation pathways of MET and IBU were proposed according to the organic intermediates identified and the reaction sites based on d. function theory (DFT) calculations The present study deepened our understanding on the MnO₂ catalyzed ozonation and provided reference to enhance the process efficiency.

Science of the Total Environment 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, Formula: C9H17NO.

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

Huang, Zhiyan published the artcileCoagulation treatment of swine wastewater by the method of in-situ forming layered double hydroxides and sludge recycling for preparation of biochar composite catalyst, COA of Formula: C9H17NO, the publication is Chemical Engineering Journal (Amsterdam, Netherlands) (2019), 784-792, database is CAplus.

In order to achieve enhanced treatment of swine wastewater as well as resource recycle, in this work, we applied coagulation treatment on swine wastewater by adding Fe and Mg ions, MgFe layered double hydroxides (LDHs) was yielded during coagulation process and the coagulation sludge was recycled to prepare biochar composite catalyst. The removal rates of total phosphorus (TP) and COD (COD) by Mg-Fe coagulation could achieve 82.55% and 98.51%, which is higher than that by coagulation with individual Mg²⁺ or individual Fe³⁺. Finely dispersed MgFe-LDHs flocculation was formed during the coagulation process and was embedded within zoogloea, suspended particles, organic matters, etc. The obtained coagulation sludge was recycled to prepare biochar composite catalyst by oxygen-limited pyrolysis. Redox reaction of iron compounds and electron shuttles capacity of biochar in the catalyst could activate potassium peroxymonosulfate (PMS) to generate ·OH, ·OOH and ¹O₂, which was responsible for catalysis potential. The as-prepared biochar composite catalyst showed satisfactory catalytic degradation capacity on tylosin and rhodamine B (pH value varied from 3 to 10), and the maximum degradation rate achieved 92.2% for tylosin and 81.9% for rhodamine B (RhB). Coagulation treatment of swine wastewater and in-situ formed layered double hydroxides recycling was suitable in wastewater treatment and resource recycling, of which the degradation rates of RhB were above 83% after five cycling experiments In general, the combined process exhibits great potential for the deep treatment of swine wastewater and resource recycling for sludge.

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, COA of Formula: C9H17NO.

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

Yi, Hailing published the artcileUltrasonic treatment enhances the formation of oxygen vacancies and trivalent manganese on α-MnO₂ surfaces: Mechanism and application, Synthetic Route of 826-36-8, the publication is Journal of Colloid and Interface Science (2022), 629-638, database is CAplus and MEDLINE.

Catalytic activity is the main obstacle limiting the application of peroxymonosulfate (PMS) activation on transition metal oxide catalysts in organic pollutant removal. Herein, ultrasonic treatment was applied to α-MnO₂ to fabricate a new u-α-MnO₂ catalyst for PMS activation. Di-Me phthalate (DMP, 10 mg/L) was almost completely degraded within 90 min, and the pseudofirst-order rate constant for DMP degradation in the u-α-MnO₂/PMS system was âˆ? times that in the initial α-MnO₂/PMS system. The ultrasonic treatment altered the crystalline and pore structures of α-MnO₂ and produced defects on the u-α-MnO₂ catalyst. According to the XPS, TG, and EPR results, higher contents of trivalent Mn and oxygen vacancies (OVs) were produced on the catalyst surfaces. The OVs induced the decomposition of PMS to produce ¹O₂, which was identified as the main reactive oxygen species (ROS) responsible for DMP degradation The u-α-MnO₂ catalyst presented great reusability, especially by ultrasonic regeneration of OVs toward the used catalyst. This study provides new insights into regulating OVs generation and strengthening catalyst activity in the PMS activation process for its application in water purification

Journal of Colloid and Interface Science 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 C6H12N2O, Synthetic Route of 826-36-8.

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

Vuong, Wayne published the artcileSynthesis of Chiral Spin-Labeled Amino Acids, Application of 2,2,6,6-Tetramethylpiperidin-4-one, the publication is Organic Letters (2019), 21(24), 10149-10153, database is CAplus and MEDLINE.

Spin-labeled amino acids (SLAAs) are often used to determine intermol. distances and conformations in proteins via double electron-electron resonance. Currently available SLAAs can be difficult to incorporate selectively and have little resemblance to natural side chains in proteins. Enantioselective synthesis of three spin-labeled L-amino acids is described, starting from readily available 2,2,6,6-tetramethyl-4-piperidinone. These SLAAs better replicate canonical residues in proteins and aim for biol. incorporation via genetic incorporation or solid-phase peptide synthesis.

Organic Letters 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 C19H21N3O3S, Application of 2,2,6,6-Tetramethylpiperidin-4-one.

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

Neuwald, Isabelle published the artcileFilling the knowledge gap: A suspect screening study for 1310 potentially persistent and mobile chemicals with SFC- and HILIC-HRMS in two German river systems, Name: 2,2,6,6-Tetramethylpiperidin-4-one, the publication is Water Research (2021), 117645, database is CAplus and MEDLINE.

Persistent and mobile chems. (PM chems.) were searched for in surface waters by hydrophilic interaction liquid chromatog. (HILIC) and supercritical fluid chromatog. (SFC), both coupled to high resolution mass spectrometry (HRMS). A suspect screening was performed using a newly compiled list of 1310 potential PM chems. to the data of 11 surface water samples from two river systems. In total, 64 compounds were identified by this approach. The overlap between HILIC- and SFC-HRMS was limited (31 compounds), confirming the complementarity of the two methods used. The identified PM candidates are characterized by a high polarity (median logD -0.4 at pH 7.5), a low mol. weight (median 187 g/mol), are mostly ionic (54 compounds) and contain a large number of heteroatoms (one per four carbons on average). Among the most frequently detected novel or yet scarcely investigated water contaminants were cyanoguanidine (11/11 samples), adamantan-1-amine (10/11), trifluoromethanesulfonate (9/11), 2-acrylamido-2-methylpropanesulfonate (10/11), and the inorganic anions hexafluorophosphate (11/11) and tetrafluoroborate (10/11). 31% of the identified suspects are mainly used in ionic liquids, a chem. diverse group of industrial chems. with numerous applications that is so far rarely studied for their occurrence in the environment. Prioritization of the findings of PM candidates is hampered by the apparent lack of toxicity data. Hence, precautionary principles and minimization approaches should be applied for the risk assessment and risk management of these substances. The large share of novel water contaminants among these findings of the suspect screening indicates that the universe of PM chems. present in the environment has so far only scarcely been explored. Dedicated anal. methods and screening lists appear essential to close the anal. gap for PM compounds

Water Research 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, Name: 2,2,6,6-Tetramethylpiperidin-4-one.

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

Xue, Wenwen published the artcilePost-polymerization modification of polymeric active esters towards TEMPO containing polymers: a systematic study, Quality Control of 826-36-8, the publication is European Polymer Journal (2020), 109660, database is CAplus.

Organic radical batteries (ORB) are a novel promising class for energy storage, particularly featuring a fast charging capability and extraordinary cycle life. The representative polymer, i.e. poly(2,2,6,6-tetramethylpiperidinyloxy-4-yl methacrylate) (PTMA), is usually synthesized by a post-polymerization oxidation method. As an alternate strategy for developing TEMPO-containing polymers, we focused on the post-polymerization modification of poly(pentafluorophenyl acrylate) and poly(pentafluorophenyl methacrylate) with three different TEMPO nucleophiles by transesterification or amidation reactions. Optimizing the conditions of the post-polymerization functionalization reaction by varying different parameters, such as the type of nucleophile, catalyst and solvent, the feeding ratios of catalysts and nucleophiles, along with reaction time and temperatures, resulted in structurally distinct TEMPO containing polymers with varying backbone composition Intriguingly, poly(2,2,6,6-tetramethylpiperidinyloxy-4-yl acrylamide) revealed the highest degree functionalization with TEMPO (96.2%) within 3 h. under considerably mild conditions, while poly(2,2,6,6-tetramethylpiperidinyloxy-4-yl methylmethacrylamide) exhibited the lowest TEMPO content owing to the steric hindrance from Me group on both the methacrylate chain and the TEMPO derivative All other four TEMPO containing polymers had a radical content similar to PTMA (66.6%) synthesized by the post-oxidation methodol. Noteworthy, compared to TEA (trimethylamine), DMAP (4-dimethylaminopyridine) facilitated an efficient ester bond cleavage independent of the polymer precursor, thus, side reactions such as hydrolysis were increased. Though hydrolysis side reaction occurred, the resulting carboxylic acid group was proven to accelerate ion transfer in a certain way during the redox process. Furthermore, due to the higher TEMPO content, poly(2,2,6,6-tetramethylpiperidinyloxy-4-yl acrylamide) exhibited a 12-22 mAh/g higher specific capacity compared to the PTMA-oxidation when running at 5C for 500 cycles.

European Polymer Journal 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 C23H43NP2, Quality Control of 826-36-8.

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

Patra, Biswa R. published the artcileSlow pyrolysis of agro-food wastes and physicochemical characterization of biofuel products, HPLC of Formula: 826-36-8, the publication is Chemosphere (2021), 131431, database is CAplus and MEDLINE.

Effective management and utilization of food waste and agricultural crop residues are highly crucial to mitigate the challenges of greenhouse gas generation upon natural decomposition and waste accumulation. Conversion of biogenic wastes to biofuels and bioproducts can address the energy crisis and promote environmental remediation. This study was focused on exploring the characteristics of food waste and agricultural crop residues (e.g., canola hull and oar hull) to determine their candidacy for slow pyrolysis to produce biochar and bio-oil. Process parameters of slow pyrolysis such as temperature, reaction time and heating rate were optimized to obtain maximum biochar yields. Maximum biochar yield of 28.4 wt% was recorded at optimized temperature, heating rate and reaction time of 600°C, 5°C/min and 60 min, resp. Furthermore, the physicochem., spectroscopic and microscopic characterization of biochar, bio-oil and gases were performed. The carbon content and thermal stability of biochar were found to increase at higher temperatures Moreover, bio-oil generated at higher temperatures showed the presence of phenolics and aromatic compounds

Chemosphere 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, HPLC of Formula: 826-36-8.

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

Guo, Shuai published the artcileUnveiling the mechanism of NO_x precursor formation during sewage sludge pyrolysis: Effects of carbohydrate-protein interactions, Synthetic Route of 826-36-8, the publication is Journal of Environmental Chemical Engineering (2022), 10(3), 107579, database is CAplus.

Municipal sewage sludge poses environmental and health risks, and thus, requires proper disposal using pyrolytic techniques. However, these techniques are hindered by the production of NH3 and HCN (NO_x precursors) by the sludge. Hence, a comprehensive understanding of NH³ and HCN formation during sludge pyrolysis is required to minimize its NOx footprint. As sludge N mainly occurs in proteins forms, its transformations can be modeled using amino acids. Here, we aimed to the study the mechanism by which carbohydrates influence the formation of NO_x precursors during sludge protein pyrolysis at different temperatures using glutamic acid, tyrosine, and histidine as protein models and cellulose and lignin as carbohydrate models. During pyrolysis, the release of NH³ and HCN was promoted by high temperatures and inhibited by carbohydrates. Despite this inhibitory effect, the results suggested that the release of NH3 should be considered for samples rich in aliphatic amino acids. For glutamic acid and tyrosine, NOx precursor formation was inhibited by N fixation in coke under the action of volatiles produced during carbohydrate pyrolysis. For glutamic acid, adding cellulose and lignin increased the coke-N content by 25.32% and 44.73% at 700°C. For histidine, this effect was ascribed to the ring-opening reactions induced by the free radical products of carbohydrate decomposition and the enhanced transfer of N-containing compounds to tar after ring-opening recombination. Further, heterocyclic-N within tar increased to 69.12% due to lignin-histidine interactions at 700°C. The results of this study can assist in regulating sludge protein pyrolysis intended for minimizing the production of NO_x precursors.

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 C9H17NO, Synthetic Route of 826-36-8.

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

Su, Yiping published the artcileIn situ synthesis of Tree-branch-like Copper-manganese oxides nanoarrays supported on copper foam as a superior efficiency Fenton-like catalyst for enhanced degradation of 4-chlorophenol, Recommanded Product: 2,2,6,6-Tetramethylpiperidin-4-one, the publication is Applied Surface Science (2022), 153241, database is CAplus.

Recently, considerable attention has been paid to develop novel Fenton-like oxidation systems for environmental remediation. The activation of periodate (NaIO₄) is a desirable oxidation process that drive redox reactions to produce abundant reactive oxygen species (ROS) by a suitable activator. This study reports a simple hydrothermal-calcination route for forming novel tree-branch-like copper-manganese oxides (CuMnOx@MnOx, CMM) nanoarrays, and the production of radical species from NaIO₄ induced by CMM for the removal of rhodamine B and 4-chlorophenol from wastewater. The synergistic effects of Cu oxides and Mn oxides composite significantly elevated the activation of periodate, exhibited excellent degradation performance in the CMM/NaIO₄. Furthermore, reduced copper species and mixed-valence manganese species play a major role in reaction via XPS anal. Addnl., the underlying degradation mechanism of this work was systematically researched by radical quenching tests and EPR anal. Superoxide anion radical (·O^–2) was the major free radicals in this system, simultaneously the production of non-radical singlet oxygen (¹O₂) via the electron transfer, which are contributed to remove organic pollutants. This work provides a facile way for fabricating monolithic multi-component metal oxides, and new insights into understand activation mechanism of manganese-based periodate activator.

Applied Surface Science 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 C3H3Br2ClO, Recommanded Product: 2,2,6,6-Tetramethylpiperidin-4-one.

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