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11.
Xuecheng Liu Lin Liu Yugo Osaka Hongyu Huang Zhaohong He Yu Bai Shijie Li Jun Li Huhetaoli 《Journal of Material Cycles and Waste Management》2018,20(3):1499-1506
Increasing concern about the air pollution caused by sulfur dioxide (SO2) from diesel exhaust has resulted in the improvement of low-temperature desulfurization materials for the combined SO2 trap. In this study, coconut shell activated carbon (AC) is pretreated by nitric acid to prepare MnO2-based activated carbon materials for SO2 removal. The prepared materials are characterized intensively by SEM, TEM, BET, XRD, FTIR, and XPS. The SO2 capture capacity of these materials are measured at low temperature by thermogravimetry, and the SO2 equilibrium adsorption characteristic is also investigated. The results show that the concentrations of nitric acid do not significantly change the textural properties of MnO2-based AC materials. The content of surface-oxygenated groups (carbonyl carbon and transition) initially increases with the HNO3 concentration rising and reaches the maximum value when the HNO3 concentration is 10 mol/L, resulting in the enhancement of the SO2 capture capacity. SO2 capture capacity of MnO2-based activated carbon decreases after regeneration and keeps stable after several cycles of thermal regeneration. The experimental data for SO2 adsorption on MnO2-based AC composite can fit the Freundlich model well in comparison with Langmuir model. 相似文献
12.
Yugo Nomura Kazuo Fujiwara Makoto Takada Satoshi Nakai Masaaki Hosomi 《Journal of Material Cycles and Waste Management》2008,10(1):14-18
In previous studies, we focused on a mechanochemical process for recycling fly ash for use in cement; this process was expected
to immobilize heavy metals in the fly ash, a desirable outcome in light of the fact that recycled fly ash is commonly used
in the synthesis of inorganic materials. Here, we investigated the leaching of lead (Pb) from fly ash treated by a mechanochemical
process and from cement prepared from the treated fly ash. We used lead oxide (PbO), a typical Pb compound in fly ash, as
a model substance. Mechanochemical treatment of the fly ash inhibited Pb leaching by 93%, and further inhibition (more than
99.9%) was observed in cement produced from the treated fly ash. During the mechanochemical treatment, PbO was reduced to
Pb by iron from the stainless-steel mill used for processing, and the lower solubility of Pb in water resulted in immobilization
of the Pb. 相似文献
13.
Akio Kamimura Yugo Akinari Takeru Watanabe Kazuo Yamada Fumiaki Tomonaga 《Journal of Material Cycles and Waste Management》2010,12(2):93-97
We have achieved major improvements in the efficient chemical recycling of waste fiber-reinforced plastics (FRPs). The effects
of reduction in the amounts of dimethylaminopyridine (DMAP) used for depolymerization were examined. The treatment of waste
FRP in the presence of 1 or 2 wt% DMAP resulted in the successful recovery of monomeric materials that could be employed in
the polymerization process to produce recycled plastic. The separation of linker units from glass fiber, however, was unsuccessful.
The purity of the recovered monomeric material, when treated with activated charcoal, was improved to about 70%. This resulted
in effective decoloration of the recovered monomer. Finally, the purified material, after undergoing repolymerization, provided
high-quality recycled plastic comparable to new plastics produced from new monomers. 相似文献
14.
Van Nam Thai Tohru Morioka Akihiro Tokai Yugo Yamamoto Takanori Matsui 《Journal of Cleaner Production》2010,18(14):1446-1457
Although the selection of product categories is a deciding factor for the success of eco-labelling schemes, there are no consistent methods for determining selection factors and how to prioritise product categories for developing countries (DgCs). This paper attempts to identify appropriate factors for product category selection and formulate a prioritisation method applicable to DgCs. We first examined the selection factors currently utilised in schemes worldwide by conducting a questionnaire survey of representatives of foreign schemes. Selection factors were illustrated on a plot graph, which indicated the percentage of factors implemented in the schemes of DgCs and developed countries (DGs), and their plausibility assessed when utilised in the schemes of DgCs. In this way, we proposed three groups of factors: an exclusion factor, five core factors and seven operational factors. Then, under the conditions of DgCs, such as socioeconomic issues and availability of data, we used and modified some judging guidelines of the European Ecolabel (the EU Flower), e.g. determining the environmental impacts and potential of environmental improvements, in the scoring method to prioritise product categories by weighting factors. In light of our findings, we utilised the proposed factors and modified the scoring method to prioritise the screened primary list of product categories of Vietnamese manufacturing sub-sectors. By scoring factor-based questions and prioritising in three ways, i.e. following the scoring method of the EU Flower programme, totalling all values with equal weighting, and totalling all values but by doubling the weighting of core factors compared with operational factors, we observed that the weighted prioritisation differentiates priority product categories more clearly than the other methods. We propose the two highest potential candidates for eco-labelling in Vietnam, namely textile/garment and fishery products. 相似文献