by Lidiane A. Morais  , Francisco L. Castro  , Glauber J.T. Fernandes  , Marcio D.S. Araujo  , Mirna F. Farias  , Ana P.M.A. Guedes  , Valter J. Fernandes Jr  and Antonio S. Araujo

Received: 17 August 2022;  Published: 30 May 2023;  doi: 10.21926/cr.2302017

The TiO2/MCM-41 nanomaterials were synthesized by impregnation with an excess solvent with different percentages of titanium dioxide. They were used for catalytic degradation of Benzene Toluene Ethylbenzene and Xylenes (BTEX) in the presence of hydrogen peroxide in aqueous media. The obtained materials were characterized by X-ray Diffraction, nitrogen adsorption-desorption using the BET method and Fourier Transform Infrared Spectroscopy. The nanostructured phase of the hexagonal ordered materials was obtained even [...]

by Luana Góes Soares  and Annelise Alves

Received: 14 December 2022;  Published: 17 April 2023;  doi: 10.21926/cr.2302016

The synthesis of fibers by electrospinning allows for obtaining nanostructures of one-dimensional materials with good flexibility, optical and catalytic properties, high surface area and porosity. They can be used in applications such as: catalysts, solar cells, fuel cells, membranes, and hydrogen batteries, among others. Here we emphasize that few reports in the literature describe the existing synergism between the optical and photocatalytic properties of TiO2, and the influence of this synergism on the formation [...]

by Erivaldo Genuíno Lima  , Fabiana Medeiros Nascimento Silva  , Tellys Lins Almeida Barbosa  and Meiry Gláucia Freire Rodrigues

Received: 20 December 2022;  Published: 07 April 2023;  doi: 10.21926/cr.2302015

This work prepared mordenite using seeds and without organic structure-directing agents (OSDAs). The Mo/Mordenite was prepared through wet impregnation and the catalysts’ performance was checked for transesterification of soybean oil with methanol. The mordenite zeolite was prepared through hydrothermal crystallization under static conditions with a molar composition of 6Na2O:Al2O3:30SiO2:780H2O. The catalyst samples were characterized crystallinity through X-ray diffraction, elemental composition by X-ray fluoresc [...]

by Muhammad Ismail

Received: 09 November 2022;  Published: 15 March 2023;  doi: 10.21926/cr.2301014

Silver nanoparticles have been utilized in an easy, sensitive, and effective approach through spectrophotometry and spectrofluorimetry to quantify urea in water samples. Here, 1,3-di-(1H-imidazole-1-yl) -2-propanol (DIPO) was employed to stabilize Ag NPs produced from the reduction of aqueous silver nitrate by sodium borohydride (NaBH4). Beer-Lambert's law was applied for determination using the complexation of Ag NPs with urea molecules. The results show urea can be assessed concurrently with good results and perc [...]

by Jharna Gupta  and Madhu Agarwal

Received: 08 December 2022;  Published: 13 March 2023;  doi: 10.21926/cr.2301013

Waste marble powder (WMP) is Investigated for developing heterogeneous catalysts by calcination method and used in biodiesel synthesis by esterification-transesterification process from Pongamia Pinnata oil. Hammet indicators, Fourier transform infrared (FT-IR), Thermogravimetric analysis, and X-ray powder diffraction (XRD) techniques were also studied for the characterization of developed catalyst from waste marble powder (WMP). The conversion of calcium carbonate to calcium oxide in marble powder was found at 800 [...]

by Heloísa Maria de Oliveira  , Francisco Alex de Sousa Silva  , Tellys Lins Almeida Barbosa  and Meiry Gláucia Freire Rodrigues

Received: 06 December 2022;  Published: 13 March 2023;  doi: 10.21926/cr.2301012

In an attempt to synthesize nanomaterial concerning chemistry, the sustainable synthesis of Zeolitic Imidazolate Framework-8 (ZIF-8) nanoparticles by a low-cost approach through the recycling of waste mother liquors was explored and then indicated the potential to remove chlorhexidine (CHLX) from an aqueous solution. ZIF-8 was produced under solvothermal reaction at 25°C and characterized by Fourier Transform Infrared Spectroscopy, X-ray diffraction, adsorption/desorption of N2, dynamic light scattering and contact [...]

by Nilam C. Dige  , Chandrama S. Randive  , Omkar S. Tamhane  , Rushikesh S. Ghorpade  , Sanjay R. Kale  and Prasad G. Mahajan

Received: 03 December 2022;  Published: 12 March 2023;  doi: 10.21926/cr.2301011

Keeping the green chemistry approach in mind we have synthesized a novel morpholine-based ionic liquid [NBMMorph]+Br-. The structure of Ionic liquid was confirmed by spectral techniques viz. IR, 1H NMR, and 13C NMR, analysis. The synthesized novel IL [NBMMorph]+Br- was utilized to prepare 1,2,4-triazolidine-3-thiones of biological significance. The [NBMMorph]+Br- IL shows excellent catalytic activity, and a simple filtration technique can separate the thiazolidinedione products. The structure of the synthesized com [...]

by Thiago Rodrigo Barbosa Barros  , Thianne Silva Batista Barbosa  , Tellys Lins Almeida Barbosa  and Meiry Gláucia Freire Rodrigues

Received: 01 November 2022;  Published: 01 March 2023;  doi: 10.21926/cr.2301010

Rhodamine (RhB) adsorption was carried out on MCM-41 and MCM-41 calcined. The effect of parameters such as pH was investigated. The reusability potential of MCM-41 was also established and the mechanism of RhB adsorption was discussed. MCM-41 was synthesized and calcined, with all samples characterized by X-Ray Diffractometry, X-ray Fluorescence by Dispersive Energy, Infrared Spectroscopy, Scanning Electron Microscopy, and Thermogravimetric analysis. The results of the characterization techniques performed confirme [...]

by Vsévolod Mymrin  , Reinaldo H. G. Alarcon  , Marilia A. Guidolin  , Kirill Alekseev  , Rogerio J. Hultmann  , Walderson Klitzke  , Karina Q. Carvalho  , Fernando H. Passig  , Charles W.I. Haminiuk  and Rodrigo E. Catai

Received: 08 December 2022;  Published: 27 February 2023;  doi: 10.21926/cr.2301009

Methanol synthesis catalyst (MSC) waste was applied as the principal component (till 70 wt.%) of sustainable ceramics in composites with bauxite processing waste (RM), and waste foundry sand (FS). The results of the initial components' chemical interaction studies by a complex of methods (XRD, SEM/EDS/mapping, AAS and LAMMA) during heating demonstrated the synthesis of amorphous glasslike new formation, their filling of pores and compaction of the ceramic’s structure. In this case, a strong chemical and mechanical [...]

by Miguel Angulo  and M a Carmen Márquez

Received: 30 December 2022;  Published: 16 February 2023;  doi: 10.21926/cr.2301008

This work demonstrates the possibility of implementing a technology that allows profitable value to be drawn from the meat waste from retail stores. Protein hydrolysate, collagen and fatty acids were recovered from meat waste through enzymatic hydrolysis using a mixture of enzymes: a protease (Alcalase) and a lipase (Resinase). Enzymatic hydrolysis was studied by response surface methodology (RMS). Four independent variables were used to study the response variables. The analysis showed that all factors including p [...]