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首页> 外文期刊>Separation and Purification Technology >Reusable adsorbents for dilute solution separation. 6. Batch and continuous reactors for the adsorption and degradation of 1,2-dichlorobenzene from dilute wastewater streams using titania as a photocatalyst
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Reusable adsorbents for dilute solution separation. 6. Batch and continuous reactors for the adsorption and degradation of 1,2-dichlorobenzene from dilute wastewater streams using titania as a photocatalyst

机译：可重复使用的吸附剂，用于稀溶液分离。 6.使用二氧化钛作为光催化剂从稀废水中吸附和降解1,2-二氯苯的间歇和连续反应器

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Two types of external lamp reactors were investigated for the titania catalyzed photodegradation of 1,2-dichlorobenzene (DCB) from a dilute water stream. The first one was a batch mixed slurry reactor and the second one was a semi-batch reactor with continuous feed recycle with titania immobilized on inert supports (quartz and low density polyethylene, LDPE). The batch reactor was used to study the intermediates and reaction kinetics of DCB degradation. Four intermediate products were observed in the degradation of DCB; these being 2-chlorophenol (CP), 2,3-dichlorophenol (DCP), 1,2-dihydroxybenzene (catechol) and, o-benzoquinone. A mechanism based on these observations is proposed. Increasing the pH of the solution increased the initial rate of photodegradation of DCB. Added oxidant (hydrogen peroxide) did not have any appreciable effect on the degradation of DCB. The Langmuir-Hinshelwood kinetic parameters for DCB, DCP and CP were obtained. The steady state removals and apparent rate constants were obtained for the plug-flow reactor with different supports and compared under similar conditions. The titania supported on LDPE was five times lower than on quatz. The modification of titania surface by adsorption of a non-photodegradable polyfluorinated suractant vastely improved the rate of DCB degradation on both LDPE and quatz. The rate of photodegradation in the immobilized tubular reactor was mass transfer controlled for the flow regimes investigated, viz., Reynolds numbers, Re < 550. The steady state removal was directly proportional to the radiant flux within the range 4-16 mW cm~(-2).
机译：研究了两种类型的外部灯反应器，用于二氧化钛催化稀水流中1,2-二氯苯（DCB）的光降解。第一个是间歇式混合淤浆反应器，第二个是具有连续进料再循环的半间歇式反应器，二氧化钛固定在惰性载体（石英和低密度聚乙烯，LDPE）上。该间歇反应器用于研究DCB降解的中间体和反应动力学。在DCB的降解中观察到了四种中间产物。它们是2-氯苯酚（CP），2，3-二氯苯酚（DCP），1，2-二羟基苯（儿茶酚）和邻苯醌。提出了基于这些观察的机制。增加溶液的pH值会增加DCB的光降解初始速率。添加的氧化剂（过氧化氢）对DCB的降解没有任何明显的影响。获得了DCB，DCP和CP的Langmuir-Hinshelwood动力学参数。对于具有不同载体的活塞流反应器，获得了稳态去除率和表观速率常数，并在相似条件下进行了比较。 LDPE负载的二氧化钛比石英低五倍。通过吸附不可光降解的多氟化表面活性剂来改性二氧化钛表面，极大地提高了LDPE和石英上DCB的降解速率。固定管式反应器中的光降解速率受所研究的流动状态传质控制，即雷诺数，Re <550。稳态去除量与辐射通量成正比，范围为4-16 mW cm〜（ -2）。

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