Decolorization of Reactive Red 239 Via Heat Activated Persulfate
Issue:
Volume 7, Issue 3, September 2018
Pages:
45-49
Received:
14 August 2018
Accepted:
3 September 2018
Published:
9 October 2018
Abstract: Effluents of cotton dyeing process of textile industry is considered as extremely polluted due to presence of unfixed azo dyes and auxiliary chemicals. The complex aromatic structure and non-biodegradability nature of azo dyes involved new and efficient treatment technologies to eliminate intense color from textile wastewater. In recent years, in-situ chemical oxidation technology (ISCO) using persulfate (S2O82-) as an oxidant has appeared to be a promising method for removal of azo dyes. S2O82- can be activated by UV, heat or transition metals to generate sulfate radical (SO4-). In this study, decolorization of Reactive Red 239 (RR239) azo dye via heat activated S2O82- was explored. Experiments were conducted in a cylindrical batch reactor equipped with a water jacket. Effect of parameters such as temperature, pH and S2O82- concentration on decolorization of RR239 was investigated. The results show that decolorization efficiency was enhanced with increasing temperature from 45 to 55°C but further increase in temperature did not enhance decolorization. The pseudo first order rate constant values fit well Arrhenius equation, yielding an activation energy of 108.75 kJ mol-1 for decolorization of RR239. The highest decolorization efficiency was obtained at pH=3 under the tested pH range. As S2O82- concentration increased decolorization efficiency increased. 89.67% and 39.05% decolorization and aromatic degradation efficiencies were observed within 120 minutes of reaction time, respectively. These results show that heat activated S2O82- method was a feasible method for decolorization of RR239.
Abstract: Effluents of cotton dyeing process of textile industry is considered as extremely polluted due to presence of unfixed azo dyes and auxiliary chemicals. The complex aromatic structure and non-biodegradability nature of azo dyes involved new and efficient treatment technologies to eliminate intense color from textile wastewater. In recent years, in-s...
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Physico-Chemical Characterizations and Fuel Potential Assessment of Chrysophyllum albidum Fruits from Benin
Cosme Sagbo Kouwanou,
Papin Sourou Montcho,
Cokou Pascal Agbangnan Dossa,
Euloge Adjou,
Valentin Dieudonné Wotto,
Dominique Codjo Koko Sohounhloué
Issue:
Volume 7, Issue 3, September 2018
Pages:
50-54
Received:
10 August 2018
Accepted:
25 September 2018
Published:
31 October 2018
Abstract: This study aims to enhance agricultural resources and reduce post-harvest losses by assessing the physical and chemical characteristics of fruits and non-conventional vegetable oil extracted from Chrysophyllum albidum seeds in Benin. In this context, the fruits of Chrysophyllum albidum were collected in Tori (South Benin) and the morphological characteristics (mass, height and diameter at the equator) of the fruits, as well as the physico-chemical parameters (dry matter content, moisture content, ash content) were evaluated. The pH, soluble dry matter (Brix) and glucose levels of the juice were also evaluated. The extraction of vegetable oil from the seeds was carried out in Soxhlet followed by the determination of biochemical parameters such as quality indices such as acid, peroxide, saponification and iodine indices. The physicochemical characterisation of this oil was also carried out through the determination of density, refractive index and net calorific value (PCI). Analysis of these results reveals that the fruits of Chrysophyllumalbidum have a mean equator mass, size and diameter of 43.79±3.15g, 48.73±2.97mm and 41.11±1.13mm respectively. The levels of dry matter, moisture, and ash are respectively 51.60±0.47%, 48.40±0.47%, and 24.7±0.96% with a pH of 3.67±0.12 a Brix of 27.47±0.99 and a glucose level of 27.57mg/mL. The oil extraction efficiency is 21.52 ± 0.86% with a water and volatile matter content of 2.21 ± 0.64%. This vegetable oil has a dark red colour with an iodine value of 33.21 ± 0.08 g I2 /100 g-Oil, a saponification value of 188.40 ± 4.18 mg KOH / g-Oil, an acid value of 3.60 ± 0.23 mg KOH / g-Oil, a peroxide value of 10.46 ± 0.12 meq O2/g-Oil and an ester value of 155.19 ± 0.17 mg KOH / g-Oil. The density of vegetable oil at 30°C is 0.89. The refractive index of vegetable oil at 30°C is 1.48 with a lower calorific value of 40287.92 kJ/kg. The results thus obtained indicate possible ways of using Chrysophyllum albidum fruits as biofuel.
Abstract: This study aims to enhance agricultural resources and reduce post-harvest losses by assessing the physical and chemical characteristics of fruits and non-conventional vegetable oil extracted from Chrysophyllum albidum seeds in Benin. In this context, the fruits of Chrysophyllum albidum were collected in Tori (South Benin) and the morphological char...
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