化学氧化法制备了负载氧化钛的可膨胀石墨(Graphite intercalation compounds loaded with titanium oxide,TGICs),考察了其热处理温度对所制得负载二氧化钛膨胀石墨TEG膨胀体积和对直接深蓝C-3R(Direct deep blue,DDB)脱色性能的影响....化学氧化法制备了负载氧化钛的可膨胀石墨(Graphite intercalation compounds loaded with titanium oxide,TGICs),考察了其热处理温度对所制得负载二氧化钛膨胀石墨TEG膨胀体积和对直接深蓝C-3R(Direct deep blue,DDB)脱色性能的影响.DDB脱色的热力学实验表明:TEG-900对DDB的脱色率随溶液离子强度的增加而增大,随DDB初始质量浓度的增加而降低;而TEG-900对DDB的吸附去除量和二氧化钛紫外光催化去除量均随DDB初始质量浓度的增加而增大;该脱色过程可以用Freundlich方程很好的拟合.脱色动力学实验表明:TEG-900在紫外光照射下对DDB的脱色过程可以用Langmuir-Hinshelwood动力学模型模拟.展开更多
In recent years,high-entropy alloys(HEAs)have received more and more attention due to their unique microstructure and properties.Several researchers have reported that some ball-milled(BM)HEAs powders possess prominen...In recent years,high-entropy alloys(HEAs)have received more and more attention due to their unique microstructure and properties.Several researchers have reported that some ball-milled(BM)HEAs powders possess prominent decolorization performance for azo dyes.Three kinds of Co-free HEA powders(AlCrFeMn,AlCrFeNi and FeCrNiMn)have been synthesized by ball milling in this work,of which AlCrFeMn shows the best decolorization efficiency for DB6 aqueous solution.However,at this time,the BM HEAs are in powder state and not easy to be reused,so the loss rate of the powders is high during the reaction.Sometimes,the reaction between reacted the powders and the dye solution is too fast to control.While,in order to solve these problems,this work proposes to immobilize bare BM AlCrFeMn HEA powders in calcium alginate beads(CAB s)by electrospray and microfluidics.Through four cycles of reaction,the loss rate of the AlCrFeMn powders can be reduced from 40 to 5 wt%if the powders are immobilized by CABs with an average diameter of 0.55 mm obtained at the DC voltage of 30 kV.In addition,in the four cycles of experiment,the AlCrFeMn HEA-CABs with an average diameter of0.55 mm shows better stability and easier separation than that of the bare AlCrFeMn powders.These findings provide new ideas for HEAs to decolorize azo dyes and are of great significance for protecting freshwater resources.展开更多
文摘化学氧化法制备了负载氧化钛的可膨胀石墨(Graphite intercalation compounds loaded with titanium oxide,TGICs),考察了其热处理温度对所制得负载二氧化钛膨胀石墨TEG膨胀体积和对直接深蓝C-3R(Direct deep blue,DDB)脱色性能的影响.DDB脱色的热力学实验表明:TEG-900对DDB的脱色率随溶液离子强度的增加而增大,随DDB初始质量浓度的增加而降低;而TEG-900对DDB的吸附去除量和二氧化钛紫外光催化去除量均随DDB初始质量浓度的增加而增大;该脱色过程可以用Freundlich方程很好的拟合.脱色动力学实验表明:TEG-900在紫外光照射下对DDB的脱色过程可以用Langmuir-Hinshelwood动力学模型模拟.
基金the National Natural Science Foundation of China(Grant No.51671056)Jiangsu Key Laboratory for Advanced Metallic Materials(Grant No.BM2007204)。
文摘In recent years,high-entropy alloys(HEAs)have received more and more attention due to their unique microstructure and properties.Several researchers have reported that some ball-milled(BM)HEAs powders possess prominent decolorization performance for azo dyes.Three kinds of Co-free HEA powders(AlCrFeMn,AlCrFeNi and FeCrNiMn)have been synthesized by ball milling in this work,of which AlCrFeMn shows the best decolorization efficiency for DB6 aqueous solution.However,at this time,the BM HEAs are in powder state and not easy to be reused,so the loss rate of the powders is high during the reaction.Sometimes,the reaction between reacted the powders and the dye solution is too fast to control.While,in order to solve these problems,this work proposes to immobilize bare BM AlCrFeMn HEA powders in calcium alginate beads(CAB s)by electrospray and microfluidics.Through four cycles of reaction,the loss rate of the AlCrFeMn powders can be reduced from 40 to 5 wt%if the powders are immobilized by CABs with an average diameter of 0.55 mm obtained at the DC voltage of 30 kV.In addition,in the four cycles of experiment,the AlCrFeMn HEA-CABs with an average diameter of0.55 mm shows better stability and easier separation than that of the bare AlCrFeMn powders.These findings provide new ideas for HEAs to decolorize azo dyes and are of great significance for protecting freshwater resources.
