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首页> 外文期刊>Applied Surface Science >Surface modification of pitch-based spherical activated carbon by CVD of NH_3 to improve its adsorption to uric acid
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Surface modification of pitch-based spherical activated carbon by CVD of NH_3 to improve its adsorption to uric acid

机译：NH_3 CVD对沥青基球形活性炭的表面改性，以提高其对尿酸的吸附

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摘要

Surface chemistry of pitch-based spherical activated carbon (PSAC) was modified by chemical vapor deposition of NH_3 (NH_3-CVD) to improve the adsorption properties of uric acid. The texture and surface chemistry of PSAC were studied by N_2 adsorption, pH_(PZC) (point of zero charge), acid-base titration and X-ray photoelectron spectroscopy (XPS). NH_3-CVD has a limited effect on carbon textural characteristics but it significantly changed the surface chemical properties, resulting in positive effects on uric acid adsorption. After modification by NH_3-CVD, large numbers of nitrogen-containing groups (especially valley-N and center-N) are introduced on the surface of PSAC, which is responsible for the increase of pHpzc. surface basicity and uric acid adsorption capacity. Pseudo-second-order kinetic model can be used to describe the dynamic adsorption of uric acid on PSAC, and the thermodynamic parameters show that the adsorption of uric acid on PSAC is spontaneous, endothermic and irreversible process in nature.
机译：沥青基球形活性炭（PSAC）的表面化学通过NH_3（NH_3-CVD）的化学气相沉积进行了改性，以提高尿酸的吸附性能。通过N_2吸附，pH_（PZC）（零电荷点），酸碱滴定和X射线光电子能谱（XPS）研究了PSAC的织构和表面化学。 NH_3-CVD对碳织构特征的影响有限，但会显着改变表面化学性质，从而对尿酸吸附产生积极影响。经过NH_3-CVD修饰后，大量的含氮基团（尤其是谷N和中心N）被引入PSAC的表面，这导致pHpzc的增加。表面碱性和尿酸吸附能力。伪二级动力学模型可用于描述尿酸在PSAC上的动态吸附，热力学参数表明，尿酸在PSAC上的吸附自然是自发的，吸热的和不可逆的。

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