Cu2+ adsorption from simulated aqueous solution was investigated using a modified spent shiitake substrate (MSSS). The results showed that the MSSS has a high adsorption efficiency and removal performance. The Cu2+rem...Cu2+ adsorption from simulated aqueous solution was investigated using a modified spent shiitake substrate (MSSS). The results showed that the MSSS has a high adsorption efficiency and removal performance. The Cu2+removal rate of the MSSS reached above 95%. Compared with spent shiitake substrate (SSS), the specific surface area, electronegativity and surface functional groups of the MSSS were all improved, resulting in a high adsorption capacity. The Cu2+ adsorption of MSSS reached equilibrium after 0.75 h and was an exothermic reaction. The SEM and EDS analyses of the MSSS before and after Cu2+ adsorption showed that the pores on the surface of the MSSS were occupied after adsorption and the Cu content increased but the Na content decreased.展开更多
Bauxite residue is an alkaline waste material in the process of alumina production due to its characteristics of higher salinity and alkalinity,which results in environmental issues and extremely restricts the sustain...Bauxite residue is an alkaline waste material in the process of alumina production due to its characteristics of higher salinity and alkalinity,which results in environmental issues and extremely restricts the sustainable development of alumina industries.In this work,we conduct a column experiment to study the effects of two amendments on aggregate stability and variations in alkaline minerals of bauxite residue.The two amendments are phosphogypsum(PG)and phosphogypsum and vermicompost(PVC).The dominant fraction in aggregate is 1–0.25 mm in diameter on the surface,which takes up 39.34%,39.38%,and 44.51%for CK,PG,and PVC,respectively.Additions of PG and PVC decreased pH,EC,ESP,exchangeable Na^+concentration and the percentage of alkaline minerals,and then increased exchangeable Ca^2+concentration in bauxite residue.There was significant positive correlation between pH and exchangeable Na^+concentration,the percentage of cancrinite,tricalcium aluminate and calcite;while negative correlation was found in pH value versus exchangeable Ca^2+concentration.Theses findings confirmed that additions of phosphogypsum and vermicompost have a stimulative effect on aggregate stability in bauxite residue.In particular,amendment neutralization(phosphogypsum+vermicompost)in column represents an advantage for large-scale simulation of vegetation rehabilitate in bauxite residue disposal areas.展开更多
To enhance the adhesion of seeding-cells to the biomaterial scaffolds, the PEG-hydrogels were modified. Porcine aortic valves were decellularized with Triton X-100 and trypsin. The cells were encapsulated into the PEG...To enhance the adhesion of seeding-cells to the biomaterial scaffolds, the PEG-hydrogels were modified. Porcine aortic valves were decellularized with Triton X-100 and trypsin. The cells were encapsulated into the PEG-hydrogels to complete the process of the cells attaching to the acellular porcine aortic valves. Herein, the autologous mesenchymal stem cells （MSCs） of goats were selected as the seeding-cells and the tendency of MSCs toward differentiation was observed when the single semilunar TEHV had been implanted into their abdominal aortas. Furthermore, VEGF, TGF-β1, and the cell adhesive peptide motif RGD were incorporated. Light and electron microscopy observations were performed. Analysis of modified PEG-hydrogels TEHV＇s （PEG-TEHV） tensile strength, and the ratio of reendothelial and mural thrombosis revealed much better improvement than the naked acellular porcine aortic valve （NAPAV）. The data illustrated the critical importance of MSC differentiation into endothelial and myofibroblast for remodeling into native tissue. Our results indicate that it is feasible to reconstruct TEHV efficiently by combining modified PEG-hydrogels with acellular biomaterial scaffold andautologous MSCs cells.展开更多
基金Project(51204011)supported by the National Natural Science Foundation of ChinaProject(20121000803)supported by the Foundation of the Advisor of Beijing Excellent Doctoral Dissertation of ChinaProject(2013T60063)supported by the China Postdoctoral Science Foundation
文摘Cu2+ adsorption from simulated aqueous solution was investigated using a modified spent shiitake substrate (MSSS). The results showed that the MSSS has a high adsorption efficiency and removal performance. The Cu2+removal rate of the MSSS reached above 95%. Compared with spent shiitake substrate (SSS), the specific surface area, electronegativity and surface functional groups of the MSSS were all improved, resulting in a high adsorption capacity. The Cu2+ adsorption of MSSS reached equilibrium after 0.75 h and was an exothermic reaction. The SEM and EDS analyses of the MSSS before and after Cu2+ adsorption showed that the pores on the surface of the MSSS were occupied after adsorption and the Cu content increased but the Na content decreased.
基金Projects(41701587,41877511)supported by the National Natural Science Foundation of China
文摘Bauxite residue is an alkaline waste material in the process of alumina production due to its characteristics of higher salinity and alkalinity,which results in environmental issues and extremely restricts the sustainable development of alumina industries.In this work,we conduct a column experiment to study the effects of two amendments on aggregate stability and variations in alkaline minerals of bauxite residue.The two amendments are phosphogypsum(PG)and phosphogypsum and vermicompost(PVC).The dominant fraction in aggregate is 1–0.25 mm in diameter on the surface,which takes up 39.34%,39.38%,and 44.51%for CK,PG,and PVC,respectively.Additions of PG and PVC decreased pH,EC,ESP,exchangeable Na^+concentration and the percentage of alkaline minerals,and then increased exchangeable Ca^2+concentration in bauxite residue.There was significant positive correlation between pH and exchangeable Na^+concentration,the percentage of cancrinite,tricalcium aluminate and calcite;while negative correlation was found in pH value versus exchangeable Ca^2+concentration.Theses findings confirmed that additions of phosphogypsum and vermicompost have a stimulative effect on aggregate stability in bauxite residue.In particular,amendment neutralization(phosphogypsum+vermicompost)in column represents an advantage for large-scale simulation of vegetation rehabilitate in bauxite residue disposal areas.
文摘To enhance the adhesion of seeding-cells to the biomaterial scaffolds, the PEG-hydrogels were modified. Porcine aortic valves were decellularized with Triton X-100 and trypsin. The cells were encapsulated into the PEG-hydrogels to complete the process of the cells attaching to the acellular porcine aortic valves. Herein, the autologous mesenchymal stem cells （MSCs） of goats were selected as the seeding-cells and the tendency of MSCs toward differentiation was observed when the single semilunar TEHV had been implanted into their abdominal aortas. Furthermore, VEGF, TGF-β1, and the cell adhesive peptide motif RGD were incorporated. Light and electron microscopy observations were performed. Analysis of modified PEG-hydrogels TEHV＇s （PEG-TEHV） tensile strength, and the ratio of reendothelial and mural thrombosis revealed much better improvement than the naked acellular porcine aortic valve （NAPAV）. The data illustrated the critical importance of MSC differentiation into endothelial and myofibroblast for remodeling into native tissue. Our results indicate that it is feasible to reconstruct TEHV efficiently by combining modified PEG-hydrogels with acellular biomaterial scaffold andautologous MSCs cells.
