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 con [...]

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 Mª 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 [...]

by Sadeq Hamood Saleh Azzam  , Amreen Khanum  and Mohamed Afzal Pasha

Received: 30 September 2022;  Published: 15 February 2023;  doi: 10.21926/cr.2301007

2-Phenyl-4-arylmethylidene-5-oxazolinones were synthesized in very high yield by subjecting a mixture of an aryl aldehyde/heterocyclic aldehyde/cinnamaldehyde and hippuric acid in anhydrous acetic anhydride and catalytic Zn(OCOCH3)2·2H2O to ultrasonication at 35 KHz for 4 to 8 min. This method has many advantages: use of a green catalyst; yields are high, involves easy workup procedure, is energy efficient and economically feasible.

by Khac An DAO  , Hong Trang PHAM  and Van Vuong HOANG

Received: 01 September 2022;  Published: 31 January 2023;  doi: 10.21926/cr.2301006

Recently the GexOy nanomaterials have been studying intensively due to their interesting electronic materials, which have many particular properties and applications in nanotechnology and nano-devices fabrication. Much work has been done on many different synthesis methods and their properties of Ge and GexOy nanomaterials. However, the effects of the different Ge substrate surface states and Au catalyst layer thicknesses on the formation of different forms/morphologies of nanomaterials (nanowires, nanorods, nanopa [...]

by Jamylle Yanka Cruz Ribeiro  , Ronaldo Santos da Silva  , Giancarlo Richard Salazar-Banda  and Katlin Ivon Barrios Eguiluz

Received: 06 September 2022;  Published: 19 January 2023;  doi: 10.21926/cr.2301005

This paper describes the synthesis of Pd0.70-Nix-By nanoparticles (x:y = 0.30:0, 0:0.30, 0.25:0.05, 0.20:0.10, 0.15:0.15, and 0.10:0.20) supported on carbon Vulcan XC-72 R by the chemical reduction method using ethylene glycol as a reducing agent for the study of the electrochemical oxidation of ethanol in alkaline media. Neither surfactants nor templates were used during the syntheses. The catalysts were physically characterized by transmission electron microscopy that showed the formation of nanoparticles with di [...]

by Stamatia Spyrou  , Alexandra V. Chatzikonstantinou  , Archontoula Giannakopoulou  , Renia Fotiadou  , Silvia Priska  , Yannis V. Simos  , Aliki Tsakni  , Dimitrios Peschos  , Dimitra Houhoula  , Epaminondas Voutsas  and Haralambos Stamatis

Received: 01 December 2022;  Published: 19 January 2023;  doi: 10.21926/cr.2301004

Biomass derived from green marine macroalgae Ulva sp. is considered a rich source of bioactive compounds. In the present study, we demonstrate the increased bioactivity of a phenolic-rich extract derived from green marine macroalgae Ulva intestinalis after its treatment with fungal laccases from Trametes versicolor and Agaricus bisporus. The phenolic composition of the extract, before and after its enzymatic treatment, was determined through several analytical methods. Furthermore, the antioxidant, enzyme-inhibitor [...]