The science space in a state school in Natal city was built using a composite consisting of gypsum, EPS （expanded polystyrene）, shredded tire, cement and water. Mechanical and thermal resistances were evaluated. Ins...The science space in a state school in Natal city was built using a composite consisting of gypsum, EPS （expanded polystyrene）, shredded tire, cement and water. Mechanical and thermal resistances were evaluated. Inside the blocks, three types of fillings （EPS plates, aluminum cans and 500 mL bottles of mineral water） were placed in order to obtain a walls with higher thermal resistance, but also to give it an ecologically correct order, considering that both the tire and the EPS occupy a large space in landfills and require years to be degraded when released into the environment. Compression tests were conducted according to the rules. The experiments demonstrated that the temperature difference between the internal and external surfaces on the walls reached levels above 12.0 ℃. It was also demonstrated that the proposed composite has adequate mechanical strength to be used for sealing walls. The proposed use of the composite can contribute to reduce the significant housing deficit of Brazil, producing popular houses at low cost and with little time to work.展开更多
TI（I） in water even at a trace level is fatal to human beings and the ecosystem. Here we fabricated a new polymer-supported nanocomposite （HMO-001） for efficient TI（I） removal by encapsulating nanosized hydrous ...TI（I） in water even at a trace level is fatal to human beings and the ecosystem. Here we fabricated a new polymer-supported nanocomposite （HMO-001） for efficient TI（I） removal by encapsulating nanosized hydrous manganese dioxide （HMO） within a polystyrene cation exchanger （D-001）. The resultant HMO-001 exhibited more preferable removal of TI（I） than D-001 and IRC-748, an iminodiacetic chelating polymer, particularly in the presence of competing Ca（II） ions at greater levels in solution. Such preference was ascribed to the Donnan membrane effect caused by D-001 as well as the specific interaction between TI（I） and HMO. The adsorbed TI（I） was partially oxidized into insoluble TI（III） by HMO at acidic pH, while negligible oxidation was observed at circumneutral pH. The exhausted HMO-001 was amenable to efficient regeneration by binary NaOH-NaC10 solution for at least 10-cycle batch runs without any significant capacity loss. Fixed-bed column test of Tl（I）-contained indus- trial effluent and natural water further validated that TI（I） retention on HMO-001 resulted in a conspicuous concentration drop from 1.3 mg/L to a value lower than 0.14 mg/L （maximum concentration level for industrial effluent regulated by US EPA） and from 1-4 μg/L to a value lower than 0.1 μg/L （drinking water standard regulated by China Health Ministry）, respectively.展开更多
文摘The science space in a state school in Natal city was built using a composite consisting of gypsum, EPS （expanded polystyrene）, shredded tire, cement and water. Mechanical and thermal resistances were evaluated. Inside the blocks, three types of fillings （EPS plates, aluminum cans and 500 mL bottles of mineral water） were placed in order to obtain a walls with higher thermal resistance, but also to give it an ecologically correct order, considering that both the tire and the EPS occupy a large space in landfills and require years to be degraded when released into the environment. Compression tests were conducted according to the rules. The experiments demonstrated that the temperature difference between the internal and external surfaces on the walls reached levels above 12.0 ℃. It was also demonstrated that the proposed composite has adequate mechanical strength to be used for sealing walls. The proposed use of the composite can contribute to reduce the significant housing deficit of Brazil, producing popular houses at low cost and with little time to work.
基金financially supported by the National Natural Science Foundation of China(51078179)Natural Science Foundation of Jiangsu Province(BK2012017/2011016)+1 种基金State Key Scientific Project for Water Pollution Control and Treatment(2012ZX07206003)Program for New Century Excellent Talents in University of China(NCET10-0490)
文摘TI（I） in water even at a trace level is fatal to human beings and the ecosystem. Here we fabricated a new polymer-supported nanocomposite （HMO-001） for efficient TI（I） removal by encapsulating nanosized hydrous manganese dioxide （HMO） within a polystyrene cation exchanger （D-001）. The resultant HMO-001 exhibited more preferable removal of TI（I） than D-001 and IRC-748, an iminodiacetic chelating polymer, particularly in the presence of competing Ca（II） ions at greater levels in solution. Such preference was ascribed to the Donnan membrane effect caused by D-001 as well as the specific interaction between TI（I） and HMO. The adsorbed TI（I） was partially oxidized into insoluble TI（III） by HMO at acidic pH, while negligible oxidation was observed at circumneutral pH. The exhausted HMO-001 was amenable to efficient regeneration by binary NaOH-NaC10 solution for at least 10-cycle batch runs without any significant capacity loss. Fixed-bed column test of Tl（I）-contained indus- trial effluent and natural water further validated that TI（I） retention on HMO-001 resulted in a conspicuous concentration drop from 1.3 mg/L to a value lower than 0.14 mg/L （maximum concentration level for industrial effluent regulated by US EPA） and from 1-4 μg/L to a value lower than 0.1 μg/L （drinking water standard regulated by China Health Ministry）, respectively.
