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首页> 外文会议>International Conference on Advanced Materials Processing Technologies >PRELIMINARY RESULTS ON THE USE OF CHRYSOTILE AS CATALYST IN THE DEGRADATION OF CATIONIC AND NONIONIC SURFACTANTS AQUEOUS SOLUTIONS
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PRELIMINARY RESULTS ON THE USE OF CHRYSOTILE AS CATALYST IN THE DEGRADATION OF CATIONIC AND NONIONIC SURFACTANTS AQUEOUS SOLUTIONS

机译：在阳离子和非离子表面活性剂水溶液中使用Chrysotile作为催化剂的初步结果

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Previous results showed that the aromatic ring of sodium dodecylbenzenesulfonate (SDBS) is degraded in the presence of chrysotile. A much higher catalytic efficiency was obtained than the reported values for TiO{sub}2 under the same conditions. Chrysotile, a clay mineral fiber of low cost and relatively abundant, probably acts as a catalyst through an advanced oxidative process (AOP) involving free radical formation. We performed experiments following the degradation of the aromatic ring of the nonionic TRITON X-45 (octil-phenoxy polyethoxy ethanol) and of the cationic HERQUAT 3500 (alkyl dimethyl benzyl ammonium chloride) surfactants. Diluted surfactants aqueous solutions (0.250 L, 50 ppm) were kept in contact with chrysotile (4.0 g) in dark, at room temperature. Experiments were carried out with and without airflow, provided by a mechanical bubbler. The aromatic ring disappearance was followed through the absorbance peaks at 224 nm (TRITON X-45) and 208 nm (HERQUAT 3500) in the UV spectra. In all cases, chrysotile was used after a previous purification treatment. After 4 hours reaction, reductions in the surfactant solution concentration of 65.0% (with aeration) and 35.0% (with aeration) were observed for the TRITON X-45 and the HERQUAT 3500 surfactant, respectively. In both cases, the reactions carried out without aeration showed a lower reduction of the aromatic ring concentration (30.0% less) when compared to the values obtained for the systems with airflow. The system containing the nonionic surfactant seems to achieve equilibrium after 2 hours, which is not observed for the cationic surfactant system.
机译：前述结果表明，十二烷基苯磺酸钠（SDB）的芳环在菊花的存在下降解。在相同条件下比TiO {sub} 2的报告值获得了更高的催化效率。温石棉，成本低，相对丰富的粘土矿物纤维，可能作为通过高级氧化处理（AOP），涉及自由基形成的催化剂。我们的非离子TRITON X-45（octil - 苯氧基聚乙氧基乙醇）的芳族环的降解以下进行的实验和阳离子HERQUAT 3500（烷基二甲基苄基氯化铵）表面活性剂。稀释的表面活性剂水溶液（0.250L，50ppm）在室温下与菊花（4.0g）保持接触。通过机械鼓泡器提供的实验，并且没有气流。在UV光谱中，通过224nm（Triton X-45）和208nm（Herquat 3500）的吸光度峰进行芳香环消失。在所有情况下，在先前的纯化处理后使用Chrysotile。反应4小时后，为Triton X-45和Herquat 3500表面活性剂分别观察到表面活性剂溶液浓度为65.0％（曝气）和35.0％（用曝气）。在这两种情况下，与具有气流的系统获得的值相比，在没有通气的情况下进行的反应表明芳环浓度的降低（较少30.0％）。含有非离子表面活性剂的系统似乎在2小时后达到平衡，但对于阳离子表面活性剂体系未观察到该均衡。

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