Adsorbents with three-dimensional porous structures have gained widespread attention due to their unique characteristics,including a large surface area,high porosity,and excellent absorption capacity.One of the produc...Adsorbents with three-dimensional porous structures have gained widespread attention due to their unique characteristics,including a large surface area,high porosity,and excellent absorption capacity.One of the products is the wood sponge.The key to successfully producing wood sponges lies in an optimal multistage delignification process,which is particularly influenced by wood species,solvent,time,and temperature.The aim of this research was to analyze the characteristics of wood sponge derived from sengon wood(Falcataria moluccana Miq.)after multistage delignification.The process involved delignification using NaOH and Na_(2)SO_(3) solutions at 100℃ for 8,9 and 10 h,followed by further delignification in H_(2)O_(2) solution at 100℃ for 1,2,3,and 4 h.The samples were then frozen at -20℃ for 24 h and freeze-dried at -53℃ for 48 h.The results showed that wood sponges treated at 100℃ exhibited lower density,larger pore diameters,brighter color,and superior absorption capacity compared to untreated wood and sponges treated at room temperature for 24 h.FTIR analysis confirmed a decrease in wavelength between 1032–1035 cm^(-1),indicating the degradation of hemicellulose and lignin.XRD analysis revealed that crystallinity increased as amorphous content decreased with prolonged delignification.The wood sponges demonstrated good porosity,with an absorption capacity ranging from 0.65 to 2.24 g/g.The optimal treatment suggested in this research was multistage delignification using NaOH and Na_(2)SO_(3) solution for 10 h,followed by a 1 h treatment with H_(2)O_(2) solution.展开更多
This paper investigates an open web truss joist (OWTJ) made of laminated </span><span><span style="font-family:Verdana;">veneer lumber (LVL) </span><i><span style="font-...This paper investigates an open web truss joist (OWTJ) made of laminated </span><span><span style="font-family:Verdana;">veneer lumber (LVL) </span><i><span style="font-family:Verdana;">Paraserianthes falctaria</span></i><span style="font-family:Verdana;"> as a prefabricated tim</span></span><span style="font-family:Verdana;">ber</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">-</span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">concrete </span><span style="font-family:Verdana;">composite floor system. The four-point bending test showed that structura</span><span style="font-family:Verdana;">l performances of the OWTJ, conventional composite floor (CCF), and prefabricated composite floor (PCF) were similar. Although composite action was not developed as no lateral deformation was observed at the shear connectors, in</span><span style="font-family:Verdana;">stalling a concrete slab above the OWTJ can slightly increase the ductility</span><span style="font-family:Verdana;"> factor of the composite floor. Furthermore, a finite element model was developed, and the model proved to be suitable for simulating the structural performance of the composite floor.展开更多
基金funded by New Energy and Industrial Technology Development Organization of Japan(NEDO)—NET ZERO EMISSION TA 2023 BATCH-2—with the Grant Number 28/Ⅲ.5/HK/2023Research Program by Research Organization of Nanotechnology and Materials,National Research and Innovation Agency(Grant Number B-1484/Ⅲ.10/TK.01.00/2/2024)Research Program by Research Assistant,National Research and Innovation Agency(Grant Number B-6932/Ⅱ.5/S1.06.01/9/2023).
文摘Adsorbents with three-dimensional porous structures have gained widespread attention due to their unique characteristics,including a large surface area,high porosity,and excellent absorption capacity.One of the products is the wood sponge.The key to successfully producing wood sponges lies in an optimal multistage delignification process,which is particularly influenced by wood species,solvent,time,and temperature.The aim of this research was to analyze the characteristics of wood sponge derived from sengon wood(Falcataria moluccana Miq.)after multistage delignification.The process involved delignification using NaOH and Na_(2)SO_(3) solutions at 100℃ for 8,9 and 10 h,followed by further delignification in H_(2)O_(2) solution at 100℃ for 1,2,3,and 4 h.The samples were then frozen at -20℃ for 24 h and freeze-dried at -53℃ for 48 h.The results showed that wood sponges treated at 100℃ exhibited lower density,larger pore diameters,brighter color,and superior absorption capacity compared to untreated wood and sponges treated at room temperature for 24 h.FTIR analysis confirmed a decrease in wavelength between 1032–1035 cm^(-1),indicating the degradation of hemicellulose and lignin.XRD analysis revealed that crystallinity increased as amorphous content decreased with prolonged delignification.The wood sponges demonstrated good porosity,with an absorption capacity ranging from 0.65 to 2.24 g/g.The optimal treatment suggested in this research was multistage delignification using NaOH and Na_(2)SO_(3) solution for 10 h,followed by a 1 h treatment with H_(2)O_(2) solution.
文摘This paper investigates an open web truss joist (OWTJ) made of laminated </span><span><span style="font-family:Verdana;">veneer lumber (LVL) </span><i><span style="font-family:Verdana;">Paraserianthes falctaria</span></i><span style="font-family:Verdana;"> as a prefabricated tim</span></span><span style="font-family:Verdana;">ber</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">-</span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">concrete </span><span style="font-family:Verdana;">composite floor system. The four-point bending test showed that structura</span><span style="font-family:Verdana;">l performances of the OWTJ, conventional composite floor (CCF), and prefabricated composite floor (PCF) were similar. Although composite action was not developed as no lateral deformation was observed at the shear connectors, in</span><span style="font-family:Verdana;">stalling a concrete slab above the OWTJ can slightly increase the ductility</span><span style="font-family:Verdana;"> factor of the composite floor. Furthermore, a finite element model was developed, and the model proved to be suitable for simulating the structural performance of the composite floor.
