Studies on the thermokinetic properties of model compound of Purple acid phosphatases (Na2[Fe2(μ-O)(μ-OAC)2(IDA)2].5H2O hydrolysis of ATP, at 37℃, pH=6.0 by usingLKB-2107 Batch microcalorimentry system. The Michael...Studies on the thermokinetic properties of model compound of Purple acid phosphatases (Na2[Fe2(μ-O)(μ-OAC)2(IDA)2].5H2O hydrolysis of ATP, at 37℃, pH=6.0 by usingLKB-2107 Batch microcalorimentry system. The Michaelis constant Km=(2.898 ± 0.195)x 10-4mol.L-1 and rate constant k2=(4.617±0.193) x 10-3.s-1 have been determined. The result hasbeen discussed.展开更多
The effects of various factors,the reaction time,temperature,particle size,initial Cd2+ concentration,pH and different anion,on the adsorption behavior of Cd2+ on chitosan were investigated.The results sho...The effects of various factors,the reaction time,temperature,particle size,initial Cd2+ concentration,pH and different anion,on the adsorption behavior of Cd2+ on chitosan were investigated.The results showed that optimum conditions of adsorption by chitosan were:the counteranion species in Cd2+ solution was SO24;pH in Cd2+ solution was 40;the higher temperature and the longer reaction time was good for adsorption.展开更多
文摘采用湿化学法制备了立方体{100}、四面体{111}和菱形十二面体{110}磷酸银微晶,通过场发射扫描电镜(FE-SEM),X射线粉末衍射(XRD),固体紫外可见漫反射光谱(UV-Vis DRS),光电流,光致发光(PL)对催化剂的组分、结构、形貌及光电性质进行了系统表征。以罗丹明B(Rh B)为目标污染物,对不同形貌Ag_3PO_4微晶的可见光催化活性进行了探究。通过微热量技术结合过渡态理论和热化学循环原理对Ag_3PO_4的摩尔表面Gibbs自由能进行了测定,其数值分别为1.2972、0.9621、0.5414 k J?mol-1。采用自主设计的新型LED光-微热量系统获取了Ag_3PO_4原位光催化降解Rh B 2 h的热效应和稳定放热阶段的热焓变化率,并对其热谱曲线进行了合理的解析。结果表明,Ag_3PO_4的催化活性与原位光催化降解Rh B的热效应、热焓变化率以及摩尔表面Gibbs自由能皆呈正相关。此外,通过捕获剂实验和电子顺磁共振(ESR)确定了Ag_3PO_4光催化降解Rh B过程的主要活性基团。
文摘Studies on the thermokinetic properties of model compound of Purple acid phosphatases (Na2[Fe2(μ-O)(μ-OAC)2(IDA)2].5H2O hydrolysis of ATP, at 37℃, pH=6.0 by usingLKB-2107 Batch microcalorimentry system. The Michaelis constant Km=(2.898 ± 0.195)x 10-4mol.L-1 and rate constant k2=(4.617±0.193) x 10-3.s-1 have been determined. The result hasbeen discussed.
文摘The effects of various factors,the reaction time,temperature,particle size,initial Cd2+ concentration,pH and different anion,on the adsorption behavior of Cd2+ on chitosan were investigated.The results showed that optimum conditions of adsorption by chitosan were:the counteranion species in Cd2+ solution was SO24;pH in Cd2+ solution was 40;the higher temperature and the longer reaction time was good for adsorption.
