Advancement in Energy Storage by Paraffin

Paraffin uses in energy storage depends on preparation by encapsulation method become more effective nonconventional technique novel storge material. Many measurements as hydrophilicity, energy storage capacity, size distribution and encapsulation ratio can be evaluated. It was also found that a higher coating to paraffin ratio leads to a higher paraffin encapsulation ratio. The hydrophilicity value of microencapsulated paraffin depended mainly on the ratio of paraffin to coating the higher the ratio, the lower was its product hydrophilicity Surface response method used to design and based conditions to optimize it. Using paraffin in energy storage in the future is promising

Synthesis of silica nanoparticles from blast furnace slag as cost-effective adsorbent for efficient azo-dye removal

Synthesis of silica nanoparticles (NSBFS) from commercial blast furnace slag (BFS) and its efficiency to remove methylene blue (MB) from water as well as the desilicated blast furnace slag (DBFS) were investigated in this study. The sorbent materials were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), N2 adsorption-desorption isotherms, dynamic light scattering (DLS), scanning electron microscopy (SEM), and Energy Dispersive X-ray Analysis (EDAX). Different physiochemical parameters such as initial pH of the dye, sorbent dosage, contact time, and initial dye concentration were studied. The pseudo-first-order and pseudo-second-order models were applied to evaluate the kinetic mechanism of the adsorption process. The results show that the process follows the pseudo-second-order kinetics using NSBFS or DBFS. The adsorption equilibrium values were obtained using Langmuir and Freundlich equations, Langmuir model showed the best correlation indicate that NSBFS and DBFS are homogeneous surface. The batch adsorption experiments showed that the maximum sorption was observed at pH = 10 and 8 and the maximum uptake capacities (qm) for MB were 80.8 and 109.8 mg/g using DBFS and NSBFS, respectively. Keywords: Blast furnace slag, Desilication, Methylene blue, Nanosilic

Eco-friendly self-terminated process for preparation of CaO catalyst based on chitosan production wastes for biodiesel production

One of the major obstacles to the realization of a sustainable planet is the handling of liquid waste, which is where Chitosan production waste (CPW) have been becoming a significant environmental issue. Chitosan production waste derived CaO catalyst (CPW-CaO) was synthesized through a self-termination precipitation of acidic waste (de-mineralization step) with alkali waste (de-proteination/de-acetylation) then calcination and utilized as an eco-friendly and cost-effective catalyst to generate biodiesel from Soybean deodorizer distillate oil (SDDO). XRD, EDS, FTIR, SEM, and BET were used to characterize CPW-CaO. The catalyst demonstrated exceptional catalytic performance in the conversion of SDDO to sustainable biodiesel which matched the EN fuel specifications at 8% catalyst dosage, 12:1 ration of methanol to SDDO, 2 h, and 65 °C reaction temperature as optimum conditions that yielding a 97.1% conversion. For the first four reaction cycles, the CPW-CaO catalyst was able to produce a comparatively high conversion of biodiesel, according to the reusability study. The catalyst regeneration can be recycled for more than four cycles to produce a comparatively high biodiesel yield. The results of this study provide a cost-effective and ecologically friendly method for producing biodiesel

As(V) sorption from aqueous solutions using quaternized algal/polyethyleneimine composite beads

International audienceComposite beads (APEI*), obtained by the controlled interaction of algal biomass with PEI, followed by ionotropic gelation and crosslinking processes using CaCl2/glutaraldehyde solution, provide efficient support for metal binding. The quaternization of algal/PEI beads (Q-APEI*) significantly increases the sorption properties of the composite beads (APEI*) for As(V). The materials are characterized by SEM/EDX, TGA, BET, elemental analysis, FTIR, XPS, and titration. The sorption of As(V) is studied in function of pH while sorption mechanism is discussed in function of metal speciation and surface characteristics of the sorbent. Optimum sorption occurs at pH close to 7. Fast uptake kinetics, correlated to textural properties are successfully fitted by pseudo-first order rate equation and the Crank equation (for resistance to intraparticle diffusion); equilibrium is reached with 45–60 min. The Langmuir equation finely fits sorption isotherms; maximum sorption capacity reaches 1.34 mmol As g−1. Arsenic can be completely eluted using 0.5 M CaCl2/0.5 M HCl solutions; the sorbent maintains high sorption and desorption efficiencies for a minimum of 5 cycles. The sorbent is tested for the removal of As(V) from mining effluents containing high concentration of iron and traces of zinc. At pH 3, the sorbent shows remarkable selectivity for As(V) over Fe. After controlling the initial pH to 5, a sorbent dosage of 2 g L−1 is sufficient for achieving the complete recovery of As(V) from mining effluent (corresponding to initial concentration of 1.295 mmol As L−1)