China 
Africa 
Explore chapters and articles related to this topic
Atom Economy
Published in Aidé Sáenz-Galindo, Adali Oliva Castañeda-Facio, Raúl Rodríguez-Herrera, Green Chemistry and Applications, 2020
Kunnambeth M. Thulasi, Sindhu Thalappan Manikkoth, Manjacheri Kuppadakkath Ranjusha, Padinjare Veetil Salija, Nisha Vattakkoval, Shajesh Palantavida, Baiju Kizhakkekilikoodayil Vijayan
Fishback et al. in 2016, studied epoxidation of trans-Anethole using potassium peroxymonosulfate and meta- Chloroperoxy benzoic acid as oxidizing agents to produce trans - Anethole oxide, illustrated in Scheme 2.24.
Enhanced electron transfer for activation of peroxymonosulfate via MoS2 modified iron-based perovskite
Published in Environmental Technology, 2022
Sheng Sheng, Jingjing Fu, Siyuan Song, Yuxuan He, Jin Qian, Ziyang Yi
All chemicals and reagents used in this work are analytically pure and do not require further purification. Strontium nitrate (Sr(NO3)2), Ferric nitrate hexahydrate (Fe(NO3)3·9H2O), citric acid (C6H8O7), ethylene glycol (C2H6O2), ammonium molybdate tetrahydrate ((NH4)6Mo7O24·4H2O), thiourea (CH4N2S), potassium peroxymonosulfate (PMS, 2KHSO5·KHSO4·K2SO4), levofloxacin (LVO), sulfamethoxazole (SAX), tetracycline (TC), rhodamine B (RhB), bisphenol A (BPA), ethanol (C2H6O), methyl alcohol (MeOH, CH4O), tert-butyl alcohol (TBA, C4H10O), furfuryl alcohol (FFA), 5,5-Dimethyl-1-pyrroline-N-oxide (DMPO) and 2,2,6,6-Tetramethyl-4-piperidone (TEMP) were purchased from Aladdin Chemical Reagent Co. Ltd. H2SO4, NaOH, NaCl, NaNO3, NaH2PO4 and NaHCO3 were purchased from Sinopharm Chemical Reagent Co. Ltd (Shanghai, China).
Image processing as a tool for evaluating denture adhesives removal techniques
Published in Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization, 2019
Carlos Emanuel Natividade Ferreira de Almeida, Maria Margarida Ferreira Sampaio-Fernandes, José Carlos Reis-Campos, José Mário de Castro Rocha, Maria Helena Guimarães Figueiral da Silva, João Carlos Antunes Sampaio-Fernandes
Alkaline peroxides are generally used in the form of effervescent tablets. Their constituents include sodium bicarbonate, citric acid, sodium carbonate and potassium peroxymonosulfate (Garret et al. 1996). The period of contact between the prosthesis and the solution is fundamental. The manufacturers generally advise periods of 3–8 min, depending on the product. Harada-Hada et al. found that at least 12 h of treatment were required for an effervescent tablet to be effective. This method allows removing approximately 75% of the adhesive, and the values reach 80% after 24 h. It should be noted that these results are not practical to be applied in the clinical practice. As a final recommendation, the addition of a mechanical method is critical (Nunes et al. 2015; Harada-Hada et al. 2016). The impracticality of this protocol led the authors, in a very recent study, to ponder the application of the effervescent tablet allied with another enzymatic product. Instead of adding the pellets in water, they were added to a cellulase solution at two concentrations (0.1% and 0.5%) (Nunes et al. 2015). The results obtained were more significant with the 0.1% cellulase concentration, but to remove 80% of the adhesive at least 12 h of contact would be required. That study showed some improvement from the results of the previous study, but the required periods were still very long, being applicable only at night (Nunes et al. 2015).
Iodination of vanillin and subsequent Suzuki-Miyaura coupling: two-step synthetic sequence teaching green chemistry principles
Published in Green Chemistry Letters and Reviews, 2019
James J. Palesch, Beau C. Gilles, Jared Chycota, Moriana K. Haj, Grant W. Fahnhorst, Jane E. Wissinger
Our aim was to design a guided-inquiry experiment exemplifying similar learning outcomes to the nitration experiment through a greener, safer transformation. The ideal substrate would have multiple possible substitution positions so that EAS selectivity could be studied and would afford a crystalline product with instructive 1H NMR spectral features. Recently, we developed an oxidation of borneol to camphor using Oxone® and catalytic sodium chloride (3). This experiment has been a highly successful green addition to our organic chemistry laboratory curriculum. Oxone® is a stable triple salt consisting of 2KHSO5•KHSO4•K2SO4 which has found wide spread application in synthetic chemistry (4). One such application is the halogenation of aromatic rings using a combination of Oxone® and a halide salt in various solvents (5–7). This reaction works most efficiently with aromatic substrates containing one or more electron-donating substituents (8). The active oxidizing agent in Oxone® is potassium peroxymonosulfate (KHSO5) which is thought to react with halide salts (M + X-) to produce a source of the electrophilic X+ in the form of a hypohalous acid, HOX (4). After workup, the by-products of the reaction are environmentally-benign potassium sulfate salts.