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de Aguiar Guilherme Carletti,Batalha Daniel Carreira,Fajardo Humberto Vieira,Filho José Balena Gabriel,Bruziquesi Carlos Giovanni Oliveira,de Oliveira Luiz Carlos Alves,Gonçalves Mateus Aquino,Ramalho 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.10
In this work, the application of a new, synthesized niobium-based catalyst, called S4 (niobium oxyhydroxide), in the liquid-phase oxidation of methyl-phenyl sulfide (thioanisole) using hydrogen peroxide as oxidant was proposed. The synthetic method employed provided a material with low crystallinity and high specific surface area and acidity. A commercial material, called HY-340 (hydrated niobium oxide), was also employed as heterogeneous catalyst for comparative purposes. The results showed that the synthesized S4 material is an outstanding catalyst, being able to completely convert the substrate (thioanisole) that achieves almost 90% of selectivity for methyl phenyl sulfone formation, under mild reaction conditions. According to the theoretical and experimental combined results, the superior performance of S4 catalyst is related to the better interaction of H2O2 and thioanisole molecules with S4 surface, compared to HY-340, pointing to the greater ability of this catalyst to form reactive oxygen species in contact with hydrogen peroxide, due to its higher content of free hydroxyl groups present on its surface.
Prosthetic misfit of implant-supported prosthesis obtained by an alternative section method
Rodrigo Tiossi,Hilmo Barreto Leite Falcão-Filho,Fábio Afrânio de Aguiar, Júnior,Renata Cristina Silveira Rodrigues,Maria da Gloria Chiarello de Mattos,Ricardo Faria Ribeiro 대한치과보철학회 2012 The Journal of Advanced Prosthodontics Vol.4 No.2
PURPOSE Adequate passive-fitting of one-piece cast 3-element implant-supported frameworks is hard to achieve. This short communication aims to present an alternative method for section of one-piece cast frameworks and for casting implant-supported frameworks. MATERIALS AND METHODS Three-unit implant-supported nickel-chromium (Ni-Cr) frameworks were tested for vertical misfit (n = 6). The frameworks were cast as one-piece (Group A) and later transversally sectioned through a diagonal axis (Group B) and compared to frameworks that were cast diagonally separated (Group C). All separated frameworks were laser welded. Only one side of the frameworks was screwed. RESULTS The results on the tightened side were significantly lower in Group C (6.43 ± 3.24 µm) when compared to Groups A (16.50 ± 7.55 µm) and B (16.27 ± 1.71 µm) (P<.05). On the opposite side, the diagonal section of the one-piece castings for laser welding showed significant improvement in the levels of misfit of the frameworks (Group A, 58.66±14.30 µm; Group B, 39.48±12.03 µm; Group C, 23.13±8.24 µm) (P<.05). CONCLUSION Casting diagonally sectioned frameworks lowers the misfit levels. Lower misfit levels for the frameworks can be achieved by diagonally sectioning one-piece frameworks.
Plant and soil responses to hydrothermally converted sewage sludge (sewchar)
Melo, Tatiane Medeiros,Bottlinger, Michael,Schulz, Elke,Leandro, Wilson Mozena,Menezes de Aguiar Filho, Adelmo,Wang, Hailong,Ok, Yong Sik,Rinklebe, Jö,rg Elsevier 2018 CHEMOSPHERE - Vol.206 No.-
<P><B>Abstract</B></P> <P>This study compared the effects of sewchar and mineral fertilizer on plant responses in beans (<I>Phaseolus vulgaris</I>, var. “Jalo precoce”) and soil properties in a pot experiment in a completely randomized design with two harvests. The initial treatments consisted of a control, sewchar doses of 4, 8, 16 and 32 Mg ha<SUP>−1</SUP> and mineral fertilizer (30 mg N, 90 mg P<SUB>2</SUB>O<SUB>5</SUB> and 60 mg K<SUB>2</SUB>O kg<SUP>−1</SUP>). The treatments (4 replications each) were fertilized with 135 mg P<SUB>2</SUB>O<SUB>5</SUB> kg<SUP>−1</SUP> at the second harvest. The sewchar application rates correlated positively with the CEC, the water holding capacity, the availability of Zn, Ca, Fe, Cu, and P, and the concentrations of nitrate, ammonium, total N, total organic carbon and hot water extractable carbon. They correlated negatively with the Mg availability and the soil C: N ratio. Additionally, they correlated positively with the P, Zn and Ca uptake from the soil. For both harvests, the 16 Mg ha<SUP>−1</SUP> sewchar treatment had a total dry matter equivalent to that of the mineral fertilizer. After the second harvest, the 16 Mg ha<SUP>−1</SUP> sewchar treatment revealed 96% higher plant biomass than the control and 79% higher biomass than it did during the first period. The positive effect of sewchar in addition to phosphorous on the plant response and soil properties suggests that the residual effect of sewchar could be a promising alternative as a soil amendment for partly replacing mineral fertilizers. In future, further studies are necessary to evaluate long-term residual effects of sewchar in soil.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mineral fertilizer had higher total dry matter in the first harvest. </LI> <LI> The 16 Mg ha<SUP>−1</SUP> sewchar dose had total dry matter equivalent to mineral fertilizer. </LI> <LI> Increasing sewchar doses correlated positively with P, Zn and Ca plant uptake. </LI> <LI> Sewchar doses had higher total dry matter average in the second harvest. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Correction to: Effect of biosolid hydrochar on toxicity to earthworms and brine shrimp
Melo, Tatiane Medeiros,Bottlinger, Michael,Schulz, Elke,Leandro, Wilson Mozena,de Aguiar Filho, Adelmo Menezes,Ok, Yong Sik,Rinklebe, Jö,rg Springer-Verlag 2018 Environmental geochemistry and health Vol.40 No.1