Topic
Sawdust
About: Sawdust is a research topic. Over the lifetime, 5526 publications have been published within this topic receiving 86499 citations. The topic is also known as: wood dust & hard wood dust.
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TL;DR: In this paper, the conversion of lignin during softwood ozonation was investigated by UV and Fourier transform-infrared (FT-IR) spectroscopy.
Abstract: Ozonation of aspen sawdust of various moisture content (MC) values was investi- gated. Ozone consumption corresponding to the completion of the ozonation process was shown to be governed by the wood MC. Cellulose-containing material of a low (1-3 %) residual lignin content (LC) was produced under ozonation. It is proposed that ozone dis- solved in water is responsible for delignification. The conversion of lignin during softwood ozonation was investigated by UV and Fourier transform-infrared (FT-IR) spectroscopy. The pathways of lignin transformations are influenced by wood MC value.
34 citations
TL;DR: In this article, the feasibility of removing methylene blue (MB) dye from aqueous solutions using Pinus elliottii sawdust was evaluated using morphological and spectroscopic analyses.
Abstract: Residues from the wood industry have great potential to be used as adsorbents in the textile wastewater treatment. In this sense, this work aimed to evaluate the feasibility of removing methylene blue (MB) dye from aqueous solutions using Pinus elliottii sawdust. Initially, this material was subjected to a sequential solvent extraction to improve its adsorption capacity. After drying, it was characterized by several analytical techniques, including morphological and spectroscopic analyses. The influence of the experimental parameters on the adsorption process, such as contact time (2–240 min), pH (3.0–10.0), stirring intensity (90–210 rpm), adsorbent dosage (1.0–5.0 g L−1) and initial MB concentration (60–140 mg L−1), as well as the equilibrium, kinetics and thermodynamics were also evaluated. In general, the characterization analyses evidenced the presence of several types of oxygenated functional groups in the adsorbent chemical structure and a favorable morphology for dye removal. Regarding the adsorption process, the preliminary tests showed that all experimental parameters evaluated, in some way, interfere in the MB removal. The data set suggests that equilibrium was best described by the Freundlich model, although Fisher’s test (F) have shown that the Langmuir model could also be applied to describe the experimental results. Thermodynamics parameters, by other hand, revealed that MB dye adsorption onto the treated Pinus elliottii sawdust was spontaneous and endothermic, occurring mainly by physisorption. Concerning the removal rate, it was verified that the pseudo-second-order model better explains the kinetic data and that, according to the F test, there is a significant difference between the tested kinetic models. Finally, the data set indicated that the treated Pinus elliottii sawdust can remove about 97% of MB, and that the adsorbent used here has many of the characteristics required to be employed in the removal of cationic dyes from textile wastewater.
33 citations
TL;DR: The effects of competitive ion exchange, because of affinity differences between the metal ions for sawdust, resulting in the metals having the lower affinity being displaced by those having a higher one and to overshoot the 0.2 meq l−1 feed solution, are investigated.
Abstract: The adsorption‐desorption of copper ions and a mixture of five metal ions (cadmium, copper, nickel, lead and zinc) in aqueous solutions by a spruce sawdust column was reported. Different studies about the copper binding mechanism, the efficiency of some regenerating solutions for the copper desorption, the use of column for copper adsorption‐desorption by successive cycles as well as the adsorption‐desorption of a multi‐component solution were investigated. An ion exchange mechanism seemed to explain the removal of copper by the natural components of sawdust, i.e., calcium, magnesium and manganese accounting for 71, 13 and 5.5% respectively of the copper binding on sawdust. But, there was evidence variation in the contribution of these ions during the copper adsorption in the continuous flow process. Regeneration of the sawdust column was described by the efficiency sequence: H∗ > Ca2+ ≫ Na+, where protons were the most promising regenerating agents. Adsorption‐desorption cycles showed that coppe...
33 citations
TL;DR: In this article, supercritical carbon dioxide extraction (scCO2) has been demonstrated as an efficient tool in significantly reducing these emissions from wood pellets, and the first off-gassing measurements associated with lipid autoxidation in wood pellets post scCO2 extraction of the sawdust.
33 citations
TL;DR: In this article, the importance of renewable energy technologies was presented with focus on biomass energy as the favorable renewable energy option for rural communities Agricultural and forest residues were considered the major sources of biomass in rural communities which can sustainably contribute towards meeting the energy demand of rural people for direct heat applications through the production of biomass briquette.
Abstract: The importance of renewable energy technologies was presented with focus on biomass energy as the favorable renewable energy option for rural communities Agricultural and forest residues were considered the major sources of biomass in rural communities which can sustainably contribute towards meeting the energy demand of rural people for direct heat applications through the production of biomass briquette The effect of palm oil mill sludge as a binding agent on the properties of sawdust briquette was investigated Palm oil mill sludge was mixed with sawdust using 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100% of the weight of compacted the sawdust sample The experimental results showed that the increased addition of palm oil mill sludge into sawdust had a significant effect (p
33 citations