Application of efficient technologies is imperative to minimize the impact of textile effluents on the environment. A solution to this problem is the application of molecular sieves such as zeolites. The sodalite zeolite has structural characteristics that allow its application as an adsorbent of heavy metals and chromophoric groups, responsible for coloring the clothing fabric. The objective of this work was to synthesize and evaluate the application of sodalite zeolite with four Si/Al ratios (1.0, 1.5, 2.0 and 2.5), using organic template. X-ray diffraction exhibits the crystalline phases of sodalite zeolite, marking the presence of minerals like kaolinite, mullite and quartz. Cation-exchange-capacity is 37% more in case of 2.5-SOD zeolite, compared to that of 1.0-SOD in the zeolitization process. The dye adsorption process was efficient at low concentrations (5, 10 and 25 mg/L) of the textile dye than higher concentrations (50, 75 and 100 mg/L) of the dye and hence, determining the concentration of the dye was of fundamental importance for efficiency regarding color removal. Therefore, it can be concluded that the synthesized sodalite zeolites (with low concentrations) in our study have substantial success potential in the effective removal of dyes from the textile industry.

This work presents the production of sewage sludge oil by pyrolysis, shows the physicochemical properties and compares it with commercial diesel. The sewage sludge was dried and mixed to discarded cooking oil to increase the fuel conversion rate due to the pyrolysis process at an initial temperature of 25 °C and a final of 650 °C. The oil was distilled and analyzed in a Proton nuclear magnetic resonance (1H-NMR), Gas Chromatogram and Mass spectrometry (GC-MS), thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR) to perform a structural characterization on the molecular distribution, groups of functions and the product thermal stability. The authors measured fundamental physicochemical properties like viscosity, density and flashpoint and compared the results with the corresponding commercial S-10 diesel properties observing good agreement.

Several Carbon Capture and Storage (CCS) techniques have been studied including injections of carbon dioxide (CO₂) into the mature and/or depleted hydrocarbon reservoirs and deep saline aquifers. This work aims to test storing CO₂ into the magnesium-rich evaporite strata and also into the stratigraphic intervals containing Mg-rich brines. The test simulates Mg-carbonation of the synthetic solution obtained from the Mg-evaporite mineral, bischofite – both experimentally in the laboratory condition and also through computerised geochemical simulation. The laboratory experiments, which resulted in the crystallisation of anhydrous magnesite, were analysed. The TOUGHREACT^TM, Geochemist’s Workbench^TM (GWB) and PHREEQC^TM software simulated the experiments as computerised geochemical model and tested the results for natural geological conditions. The geochemical simulations successfully demonstrate the immense CCS potential for the Mg-evaporite (as well as the sedimentary strata charged with Mg-evaporitic brine) at their subsurface geological occurrences at elevated pressure-temperature and high salinity.

Rice husk is considered as a waste in the rice industry but is proficient in manufacturing different materials, such as zeolites, which is produced in large quantities all over the world, for example in Brazil. Zeolite is an adsorbent support material, which can be synthesized from rice husk ash (RHA) with external sources of aluminium (ESA). The scientific community has been conducting several measures to minimize the environmental impacts caused by greenhouse gases. Several mitigation processes are presently investigated, which includes carbon dioxide injections into adsorbent materials (e.g. zeolites). The efficiency of this technology involves a zeolitic material with high crystallinity and high concentrations of SiO₂ and Al₂O₃ (aluminosilicates). In the present work, zeolites have been synthesized from rice husk ash (SiO₂ source) and external aluminium sources (Al₂O₃ - alumina, gibbsite and metakaolin) to fulfill that purpose. With the aid of XRF, XRD, SEM/EDS and FTIR techniques, the zeolitic material was characterized in two distinct crystalline phases: Mordenite and ZSM-5. The synthesis was carried out by the ideal addition of ESA (2.5 g) to RHA. According to the literature, the zeolitic materials formed by the mixture of Mordenite and ZSM-5 can be availed for gas separation and greenhouse gas storage.