Terephthaloyl chloride （DB）-modified silk fibroin （SF） films were immersed into 1.5 times simulated body fluid （1.5 SBF） to regulate the mineralization of hydroxyapatite （HA） crystals at about 36.5 ℃ for 24 h...Terephthaloyl chloride （DB）-modified silk fibroin （SF） films were immersed into 1.5 times simulated body fluid （1.5 SBF） to regulate the mineralization of hydroxyapatite （HA） crystals at about 36.5 ℃ for 24 h. UV was used to prove that the new bonds form between the DB and SF. The structure and morphology of the SF/HA were investigated by FTIR, ICP, XRD and SEM. The results showed that the apatite deposited on the matrix of SF mainly was HA. HA was self-assembled on the matrix of SF and formed three- dimensional framework when the weight ratio of DB/SF was 0.30. The content of DB affected the structure and morphology of the anatite comoosites deoosited on the SF films.展开更多
A novel composite adsorbent, hydroxyapatite/ manganese dioxide （HAp/MnO2）, has been developed for the purpose of removing lead ions from aqueous solutions. The combination of HAp with MnO2 is meant to increase its a...A novel composite adsorbent, hydroxyapatite/ manganese dioxide （HAp/MnO2）, has been developed for the purpose of removing lead ions from aqueous solutions. The combination of HAp with MnO2 is meant to increase its adsorption capacity. Various factors that may affect the adsorption efficiency, including solution pH, coexistent substances such as humic acid and competing cations （Ca2＋, Mg2＋）, initial solute concentration, and the duration of the reaction, have been investigated. Using this composite adsorbent, solution pH and coexistent calcium or magnesium cations were found to have no significant influence on the removal of lead ions under the experi- mental conditions. The adsorption equilibrium was described well by the Langmuir isotherm model, and the calculated maximum adsorption capacity was 769 mg. gl. The sorption processes obeyed the pseudo-second-order kinetics model. The experimental results indicate that HAp/MnO2 composite may be an effective adsorbent for the removal of lead ions from aqueous solutions.展开更多
背景:羟基磷灰石由于其良好的组织相容性及骨传导性已经被广泛应用于骨材料的研究,但单纯羟基磷灰石不具备抗菌性能,因此对羟基磷灰石进行抗菌修饰就显得非常重要。目的:阐述羟基磷灰石抗菌修饰的相关研究进展。方法:应用计算机检索Scie...背景:羟基磷灰石由于其良好的组织相容性及骨传导性已经被广泛应用于骨材料的研究,但单纯羟基磷灰石不具备抗菌性能,因此对羟基磷灰石进行抗菌修饰就显得非常重要。目的:阐述羟基磷灰石抗菌修饰的相关研究进展。方法:应用计算机检索Science Direct online数据库、PubMed、中国知网数据库,纳入建库以来至2019年发表的相关文献。检索英文关键词为"antibacterialmechanism,hydroxyapatite,Silver,Gold,copper,cobalt,chitosan,strontium,zinc,gallium,magnesium,selenium,titanium",中文关键词"抗菌机制,抑菌机制,杀菌机制,羟基磷灰石,银,金,铜,钴,壳聚糖,锶,锌,镓,镁,硒,钛"。排除相关性低、重复文献和陈旧文献。结果与结论:羟基磷灰石的抗菌修饰方法众多,但主要以添加金属抗菌粒子为主,银、金、铜、钴、壳聚糖、锶、锌、镓、镁、硒、钛这些物质都能添加进入羟基磷灰石并使其具有抗菌活性。目前抗菌材料的研究还存在几点不足:抗菌离子在羟基磷灰石中的释放曲线尚不能很好的调控;目前抗菌材料种类较少,能用于人体植入物的就更少,还需要发现更多无毒的具有良好抗菌性能的物质以便今后使用;由于抗菌离子具有的毒性问题,每种抗菌离子的最适抗菌离子浓度还没有一个统一标准。展开更多
基金the support of Natural Science Fund of Anhui Province(No.070414193)and the fund support of Key Laboratory of Environment-friendly Polymer Materials of Anhui Province
文摘Terephthaloyl chloride （DB）-modified silk fibroin （SF） films were immersed into 1.5 times simulated body fluid （1.5 SBF） to regulate the mineralization of hydroxyapatite （HA） crystals at about 36.5 ℃ for 24 h. UV was used to prove that the new bonds form between the DB and SF. The structure and morphology of the SF/HA were investigated by FTIR, ICP, XRD and SEM. The results showed that the apatite deposited on the matrix of SF mainly was HA. HA was self-assembled on the matrix of SF and formed three- dimensional framework when the weight ratio of DB/SF was 0.30. The content of DB affected the structure and morphology of the anatite comoosites deoosited on the SF films.
基金This work was supported by the National Natural Science Foundation of China （Grant No. 41372241）.
文摘A novel composite adsorbent, hydroxyapatite/ manganese dioxide （HAp/MnO2）, has been developed for the purpose of removing lead ions from aqueous solutions. The combination of HAp with MnO2 is meant to increase its adsorption capacity. Various factors that may affect the adsorption efficiency, including solution pH, coexistent substances such as humic acid and competing cations （Ca2＋, Mg2＋）, initial solute concentration, and the duration of the reaction, have been investigated. Using this composite adsorbent, solution pH and coexistent calcium or magnesium cations were found to have no significant influence on the removal of lead ions under the experi- mental conditions. The adsorption equilibrium was described well by the Langmuir isotherm model, and the calculated maximum adsorption capacity was 769 mg. gl. The sorption processes obeyed the pseudo-second-order kinetics model. The experimental results indicate that HAp/MnO2 composite may be an effective adsorbent for the removal of lead ions from aqueous solutions.
文摘背景:羟基磷灰石由于其良好的组织相容性及骨传导性已经被广泛应用于骨材料的研究,但单纯羟基磷灰石不具备抗菌性能,因此对羟基磷灰石进行抗菌修饰就显得非常重要。目的:阐述羟基磷灰石抗菌修饰的相关研究进展。方法:应用计算机检索Science Direct online数据库、PubMed、中国知网数据库,纳入建库以来至2019年发表的相关文献。检索英文关键词为"antibacterialmechanism,hydroxyapatite,Silver,Gold,copper,cobalt,chitosan,strontium,zinc,gallium,magnesium,selenium,titanium",中文关键词"抗菌机制,抑菌机制,杀菌机制,羟基磷灰石,银,金,铜,钴,壳聚糖,锶,锌,镓,镁,硒,钛"。排除相关性低、重复文献和陈旧文献。结果与结论:羟基磷灰石的抗菌修饰方法众多,但主要以添加金属抗菌粒子为主,银、金、铜、钴、壳聚糖、锶、锌、镓、镁、硒、钛这些物质都能添加进入羟基磷灰石并使其具有抗菌活性。目前抗菌材料的研究还存在几点不足:抗菌离子在羟基磷灰石中的释放曲线尚不能很好的调控;目前抗菌材料种类较少,能用于人体植入物的就更少,还需要发现更多无毒的具有良好抗菌性能的物质以便今后使用;由于抗菌离子具有的毒性问题,每种抗菌离子的最适抗菌离子浓度还没有一个统一标准。
