直接焚烧核燃料后处理过程中产生的磷酸三丁酯(TBP)和煤油(OK)有机废液会产生磷酸,会对设备造成一定程度的腐蚀,因此在采用热解焚烧工艺处理该废液时,需掺入合适比例的中和剂和表面活性剂等添加剂,将废液配制成均匀稳定的悬浮液。中和...直接焚烧核燃料后处理过程中产生的磷酸三丁酯(TBP)和煤油(OK)有机废液会产生磷酸,会对设备造成一定程度的腐蚀,因此在采用热解焚烧工艺处理该废液时,需掺入合适比例的中和剂和表面活性剂等添加剂,将废液配制成均匀稳定的悬浮液。中和剂在热解过程中可以固定P2O5,避免磷酸生成后对设备的腐蚀。本文通过不同单因素实验研究以Ca(OH)_(2)和Mg(OH)_(2)为中和剂对配制成的TBP/OK悬浮液性能的影响,为后处理厂热解焚烧系统提供新的悬浮液配方思路。试验结果显示:当TBP含量为30%和60%时,Mg(OH)_(2)在相同TBP含量下配制成的悬浮液的最终表面黏度远大于Ca(OH)_(2),Mg(OH)_(2)和Ca(OH)_(2)在30%TBP时的最终表面黏度分别为90.36 m Pa·s和43.42 mPa·s,在60%TBP时的最终表面黏度分别为95.24 m Pa·s和75.09 m Pa·s,同时Mg(OH)_(2)的乳化速度明显优于Ca(OH)_(2),并具有更好的流动性。以Mg(OH)_(2)为中和剂的悬浮液在不同核素和DBP含量下整体稳定性更好。展开更多
The high activity of metallic magnesium and alloys limits its potential in biomedical applications;in recent years,extensive efforts have been devoted to modulating this reactivity.In this work,we present Mg(OH)_(2) a...The high activity of metallic magnesium and alloys limits its potential in biomedical applications;in recent years,extensive efforts have been devoted to modulating this reactivity.In this work,we present Mg(OH)_(2) and TiO_(2)barrier coatings to reduce the degradation of magnesium alloy(Mg-Ca-Zn)surfaces.These coatings were deposited by the anodization method and the spin-coating technique,respectively.The anodized layer was coated with TiO_(2)generated from the hydrolysis of 3%weight of TTIP(Ti[OCH(CH_(3))_(2)]_(4),Titanium(IV)isopropoxide)in 2-Propanol deposited by the spin-coating method.Studying the degradation in Ringer’s solution by electrochemical impedance spectroscopy and OCP revealed a 98%reduction in pittings in uncoated samples after 14 days of immersion.The p H measurements revealed that the TiO_(2)coating reduced the alkalization of the physiological environment,keeping the pH at 6.0 values.In vitro studies of two types of bacteria(E.coli and S.aureus)exhibited zones of inhibition in the agar and activity bactericidal(kill time test).The mechanisms behind the improved degradation resistance and enhanced antibacterial activity are presented and discussed here.Surface modification with Mg(OH)_(2)/TiO_(2)coatings is a promising strategy to control the biodegradation of magnesium implants for bone regeneration.展开更多
This study investigated the effects of torrefaction with Mg(OH)2 on the properties of bio-oil formed from the microwave-assisted catalytic fast co-pyrolysis of straw stalk and soapstock.The effects of torrefaction tem...This study investigated the effects of torrefaction with Mg(OH)2 on the properties of bio-oil formed from the microwave-assisted catalytic fast co-pyrolysis of straw stalk and soapstock.The effects of torrefaction temperature and residence time on the yield and composition of bio-oil were discussed.Results showed that the torrefaction temperature and residence time remarkably influenced the yield and composition of bio-oil.With the increase in temperature and time,the bio-oil yield and the proportion of oxygen-containing compounds decreased,while the proportion of aromatic compounds increased.When the feedstocks were subject to torrefaction reaction for 20 min at 260°C,the proportion of oxygen-containing compounds decreased from 29.89%to 16.49%.Meanwhile,Mg(OH)2 could render the deoxidization function of torrefaction process increasingly noticeable.The proportion of the oxygen-containing compounds reached a minimum(14.41%),when the biomass-to-Mg(OH)2 ratio was 1:1.展开更多
To promote the scale-up production and industrial application of magnesium oxide （MgO） whiskers, MgO whiskers were prepared by the calcination method of the precursor. The precursor MgSO4·5Mg（OH）2·2H2O ...To promote the scale-up production and industrial application of magnesium oxide （MgO） whiskers, MgO whiskers were prepared by the calcination method of the precursor. The precursor MgSO4·5Mg（OH）2·2H2O （152 MOS） single component was prepared by hydrothermal synthesis reaction in MgSO4 solution and NaOH solution. MgO whisker was prepared by heating treatment of the precursor at low heating speed to keep the structure of the precursor not be destroyed. The composition, the morphology and the structure of these whiskers were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results indicate that the MgO whisker was about 0.5-1.2 μm in diameter and 20-80 μm in length, with an aspect ratio no less than 100.展开更多
文摘直接焚烧核燃料后处理过程中产生的磷酸三丁酯(TBP)和煤油(OK)有机废液会产生磷酸,会对设备造成一定程度的腐蚀,因此在采用热解焚烧工艺处理该废液时,需掺入合适比例的中和剂和表面活性剂等添加剂,将废液配制成均匀稳定的悬浮液。中和剂在热解过程中可以固定P2O5,避免磷酸生成后对设备的腐蚀。本文通过不同单因素实验研究以Ca(OH)_(2)和Mg(OH)_(2)为中和剂对配制成的TBP/OK悬浮液性能的影响,为后处理厂热解焚烧系统提供新的悬浮液配方思路。试验结果显示:当TBP含量为30%和60%时,Mg(OH)_(2)在相同TBP含量下配制成的悬浮液的最终表面黏度远大于Ca(OH)_(2),Mg(OH)_(2)和Ca(OH)_(2)在30%TBP时的最终表面黏度分别为90.36 m Pa·s和43.42 mPa·s,在60%TBP时的最终表面黏度分别为95.24 m Pa·s和75.09 m Pa·s,同时Mg(OH)_(2)的乳化速度明显优于Ca(OH)_(2),并具有更好的流动性。以Mg(OH)_(2)为中和剂的悬浮液在不同核素和DBP含量下整体稳定性更好。
基金financed by the FOMIX-Yucatán 2008-108160,CONACYT LAB-2009-01-123913,292692,294643,188345,and 204822 projectsthe financial support received from CONACYT。
文摘The high activity of metallic magnesium and alloys limits its potential in biomedical applications;in recent years,extensive efforts have been devoted to modulating this reactivity.In this work,we present Mg(OH)_(2) and TiO_(2)barrier coatings to reduce the degradation of magnesium alloy(Mg-Ca-Zn)surfaces.These coatings were deposited by the anodization method and the spin-coating technique,respectively.The anodized layer was coated with TiO_(2)generated from the hydrolysis of 3%weight of TTIP(Ti[OCH(CH_(3))_(2)]_(4),Titanium(IV)isopropoxide)in 2-Propanol deposited by the spin-coating method.Studying the degradation in Ringer’s solution by electrochemical impedance spectroscopy and OCP revealed a 98%reduction in pittings in uncoated samples after 14 days of immersion.The p H measurements revealed that the TiO_(2)coating reduced the alkalization of the physiological environment,keeping the pH at 6.0 values.In vitro studies of two types of bacteria(E.coli and S.aureus)exhibited zones of inhibition in the agar and activity bactericidal(kill time test).The mechanisms behind the improved degradation resistance and enhanced antibacterial activity are presented and discussed here.Surface modification with Mg(OH)_(2)/TiO_(2)coatings is a promising strategy to control the biodegradation of magnesium implants for bone regeneration.
基金financial support from the National Natural Science Foundation of China (No. 21766019)the Key Research and Development Program of Jiangxi Province (20171BBF60023)+2 种基金the International Science & Technology Cooperation Project of China (2015DFA60170-4)the Science and Technology Research Project of Jiangxi Province Education Department (No. GJJ150213)the Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development Program (No. Y707sb1001)
文摘This study investigated the effects of torrefaction with Mg(OH)2 on the properties of bio-oil formed from the microwave-assisted catalytic fast co-pyrolysis of straw stalk and soapstock.The effects of torrefaction temperature and residence time on the yield and composition of bio-oil were discussed.Results showed that the torrefaction temperature and residence time remarkably influenced the yield and composition of bio-oil.With the increase in temperature and time,the bio-oil yield and the proportion of oxygen-containing compounds decreased,while the proportion of aromatic compounds increased.When the feedstocks were subject to torrefaction reaction for 20 min at 260°C,the proportion of oxygen-containing compounds decreased from 29.89%to 16.49%.Meanwhile,Mg(OH)2 could render the deoxidization function of torrefaction process increasingly noticeable.The proportion of the oxygen-containing compounds reached a minimum(14.41%),when the biomass-to-Mg(OH)2 ratio was 1:1.
文摘To promote the scale-up production and industrial application of magnesium oxide （MgO） whiskers, MgO whiskers were prepared by the calcination method of the precursor. The precursor MgSO4·5Mg（OH）2·2H2O （152 MOS） single component was prepared by hydrothermal synthesis reaction in MgSO4 solution and NaOH solution. MgO whisker was prepared by heating treatment of the precursor at low heating speed to keep the structure of the precursor not be destroyed. The composition, the morphology and the structure of these whiskers were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results indicate that the MgO whisker was about 0.5-1.2 μm in diameter and 20-80 μm in length, with an aspect ratio no less than 100.
