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Catalytic degradation of 4-chlorophenol with La/TiO2 in a dielectric barrier discharge system

机译：介电阻挡放电系统中La / TiO2的4-氯苯酚的催化降解

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Lanthanum (La) doped titanium dioxide (TiO _(2) ) introduced to the dielectric barrier discharge (DBD) system was successfully used to degrade 4-chlorophenol (4-CP). The photocatalytic materials were characterized by XRD, SEM, EDX and DRS techniques. The influence of the La doping ratio and pH on the degradation of 4-CP in the combined system of photocatalysis and plasma were investigated to evaluate the feasibility of the mixed degradation system. The 10 wt% La/TiO _(2) showed the highest percentage of 4-CP degradation (99.0%) and maximum rate constant (11.89 × 10 ~(?3) s ~(?1) ). It was also found that the catalytic activity of 10La/TiO _(2) was higher than pure synthesized TiO _(2) . Doped La effectively reduces the band gap, amends the surface and optimizes the crystal form of TiO _(2) . Higher degradation efficiency of 4-CP was observed at higher pH values. The efficiency was 99.9% at pH 10.0 in this treatment system, while a decrease was observed at pH 2.0. Catechol, hydroquinone, benzoquinone and carboxylic acid were identified as the predominant aromatic intermediates for the degradation of 4-CP, and finally, transformed into CO _(2) and H _(2) O.
机译：引入介质阻挡放电（DBD）系统的镧（LA）掺杂二氧化钛（TiO _（2））成功地用于降解4-氯酚（4-CP）。光催化材料的特征在于XRD，SEM，EDX和DRS技术。研究了La掺杂比和pH对光催化和血浆组合系统中4-CP降解的影响，评价了混合降解系统的可行性。 10wt％la / tiO _（2）显示出4-cp降解的最高百分比（99.0％）和最大速率常数（11.89×10〜（？3）s〜（？1））。还发现，10LA / TiO _（2）的催化活性高于纯合成TiO _（2）。掺杂La有效地减少了带隙，修改了表面并优化TiO _（2）的晶体形式。在更高的pH值下观察到4-CP的较高降解效率。在该处理系统中pH 10.0的效率为99.9％，而在pH 2.0下观察到减少。将儿茶酚，氢醌，苯醌和羧酸鉴定为优势芳族中间体，用于降解4-CP，最后，转化为CO _（2）和H _（2）O.

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