Thermogravimetric and kinetic analysis of thermal decomposition characteristics of microbial calcites induced by cyanobacteria Synechocystis sp. PCC6803
Thermogravimetric and kinetic analysis of thermal decomposition characteristics of microbial calcites induced by cyanobacteria Synechocystis sp. PCC6803
复制标题
蓝藻集胞藻诱导微生物方解石热分解特性的热重和动力学分析。
DOI：
10.1007/s10973-016-6026-1
复制
发表时间：
2017-01
期刊：
影响因子：
--
通讯作者：
Yang Xiu
中科院分区：
文献类型：
--
作者：
Wenya Hu;Qize Xuan;Jiaoan Chen;Yang Xiu
尽管人们一直在尝试各种复杂的方法，但至今仍难以有效区分地质区域内的生物成因矿物和非生物成因矿物。比较了由集胞藻6803诱导的微生物方解石（MC）与由碳酸钠（Na 2CO 3）和氯化钙（CaCl 2）反应制备的化学方解石（CC）的热分解特性。首先对两种样品进行了扫描电子显微镜和X射线衍射分析，然后利用热重分析仪分别在323.15 ~ 1273.15 K的不同升温速率下，以278.15、283.15、293.15和303.15 K min-1考察了两种样品的热分解行为，Kissinger-Akahira-Sunose和Flynn-Wall-Ozawa方法，然后用Popescu方法推导了动力学机理函数。结果表明，这两种沉淀物虽然表面形貌不同，但实际上都是方解石晶体。MC的热分解动力学机理函数可用Avrami-Erofeev方程描述（[−ln（1 − α）]1/3），而CC对应于收缩球（体积）（[1 −（1 − α）]1/3），MC和CC的平均活化能分别为217.9和170.5 kJ mol−1;即MC具有较高的热稳定性，这可能是由于集胞藻6803的诱导作用和提供的不同沉淀条件所致。这些结果不仅为有效区分地质区域内的生物成因矿物和非生物成因矿物提供了有用的信息，而且也为更好地理解微生物成矿作用提供了有用的信息。
Although various complicated methods have always been made attempts, it is still well difficult to efficiently distinguish between the biogenic and abiogenic minerals in geological area up to now. In present study, the thermal decomposition unique characteristics of microbial calcites (MC), induced by cyanobacteria Synechocystis sp. PCC6803, were compared with those of chemical calcites (CC) prepared by the reaction of sodium carbonate (Na2CO3) with calcium chloride (CaCl2). Two samples were firstly analyzed by scanning electron microscope and X-ray diffraction, and were further investigated thermal decomposition behaviors using a thermogravimetric analyzer at different heating rates of 278.15, 283.15, 293.15, and 303.15 K min−1 from 323.15 to 1273.15 K, respectively, then kinetic parameters were calculated via Popescu, Kissinger–Akahira–Sunose, and Flynn–Wall–Ozawa methods, and then the kinetics mechanism functions were deduced by Popescu method. The results showed that these two kinds of precipitates were actually both calcite crystals although the surface morphologies were quite different. Whereas thermal decomposition kinetics mechanism function of MC can be described as Avrami–Erofeev equation ([−ln(1 − α)]1/3), while CC corresponded to Contracting sphere (volume) ([1 − (1 − α)]1/3), the results also showed that the average activation energy of MC and CC was 217.9 and 170.5 kJ mol−1, respectively; that is, MC has higher thermal stability, which should be originated from the inducing effects and the different precipitation conditions provided by Synechocystis sp. PCC6803. These above results provided useful information not only for efficiently distinguishing between the biogenic and abiogenic minerals in geological area, and also for better understanding the microbial mineralization.
登录
查看更多内容
影响因子：
3.5
作者：
P. Straka;J. Náhunková;M. Žaloudková
通讯作者：
P. Straka;J. Náhunková;M. Žaloudková
大型藻类Macrocystis Pyrifera残渣热解特性和动力学的热重研究
影响因子：
4.4
作者：
Hui Zhao
通讯作者：
Hui Zhao
影响因子：
4.4
作者：
R. Frost;M. Hales;W. Martens
通讯作者：
R. Frost;M. Hales;W. Martens
影响因子：
4.4
作者：
J. Kováč;A. Trník;I. Medved’;L. Vozár
通讯作者：
J. Kováč;A. Trník;I. Medved’;L. Vozár
影响因子：
4.2
作者：
M. Rivadeneyra;J. Párraga;R. Delgado;A. Ramos‐Cormenzana;G. Delgado
通讯作者：
M. Rivadeneyra;J. Párraga;R. Delgado;A. Ramos‐Cormenzana;G. Delgado