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首页> 外文期刊>Journal of industrial and engineering chemistry >Pre-treatment of adsorbents for waste water treatment using adsorption coupled-with electrochemical regeneration
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Pre-treatment of adsorbents for waste water treatment using adsorption coupled-with electrochemical regeneration

机译：使用吸附结合电化学再生对废水进行预处理的吸附剂预处理

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With the aim to address waste water treatment problems, a novel and economic water treatment technology was introduced at the University of Manchester. It comprised of a unique combination of adsorption and electrochemical regeneration in a single unit. This process successfully eliminated a number of organic pollutants by using an electrically conducting adsorbent material called Nyex~(TM) which was a modified form of synthetic graphite. To expand the scope of other graphite types in waste water treatment applications, natural vein and recycled vein graphite materials were selected for electrochemical surface treatment (pre-treatment) in order to evaluate their adsorptive and electrical properties. New graphite based adsorbents were developed and characterized using a laser diffraction particle size analyser, BET surface area, SEM analysis, X-ray (EDS) elemental analysis, X-ray powder diffraction, Boehm surface titration, Zeta potential electrical bed conductivity and bulk density measurements. Boehm surface titration and EDS (X-ray) elemental analysis showed a significant increase in oxygen containing surface functional groups. Although, no significant improvement in bed electrical conductivity was found to occur after electrochemical surface treatment, however, natural vein and recycled vein graphite materials presented highest bed electrical conductivity amongst competing graphite materials. Aqueous solution of acid violet 17 as a standard pollutant was used to evaluate the comparative performance of these adsorbents. The investigations revealed that electrochemical surface treatment contributed to an increase in the adsorption capacity by a factor of two only for natural vein graphite. Un-treated recycled vein graphite adsorbent delivered the same adsorptive capacity (3.0 mg g~(-1)) to that of electrochemically treated natural vein graphite. The electrochemical regeneration efficiency at around 100% was obtained using a treatment time of 60 and 30 min, current density of 14 mA cm~(-2), charge passed of 36 and 18 C g~(-1) for synthetic graphite, natural and recycled vein graphite materials respectively. Relatively a small consumption of electrical energy, 24 J g~(-1) for regenerating natural vein graphite adsorbent versus 36 J g~(-1) for synthetic graphite adsorbent, was found to be required for destruction/oxidation of adsorbed acid violet 17. Multiple adsorption/regeneration cycles presented no loss in adsorptive capacity over 5 adsorption/regeneration cycles. The use of natural and recycled vein graphite adsorbents offered some advantages over graphite intercalation based adsorbents with reduced electrical energy consumption during regeneration and simpler separation of particulate adsorbent. KElectrochemical surface treatment;; Surface chemistry;; Adsorption;; Electrical conductivity and electrochemical;; regeneration
机译：为了解决废水处理问题，曼彻斯特大学引入了一种新颖且经济的水处理技术。它由单个单元中吸附和电化学再生的独特组合组成。该过程通过使用一种称为NyexTM的导电吸附材料成功地消除了许多有机污染物，该材料是合成石墨的一种改良形式。为了扩大其他石墨类型在废水处理应用中的范围，选择天然静脉和循环静脉石墨材料进行电化学表面处理（预处理），以评估其吸附和电性能。使用激光衍射粒度分析仪，BET表面积，SEM分析，X射线（EDS）元素分析，X射线粉末衍射，Boehm表面滴定，Zeta电位电床电导率和堆积密度，开发并表征了新的石墨基吸附剂测量。 Boehm表面滴定和EDS（X射线）元素分析显示，含氧表面官能团显着增加。尽管在电化学表面处理后未发现床电导率有显着改善，但是，天然石墨和循环石墨材料在竞争性石墨材料中表现出最高的床电导率。使用酸性紫17水溶液作为标准污染物来评估这些吸附剂的比较性能。研究表明，电化学表面处理仅对天然静脉石墨导致吸附能力提高了两倍。未经处理的循环静脉石墨吸附剂与电化学处理的天然静脉石墨具有相同的吸附能力（3.0 mg g〜（-1））。使用60到30分钟的处理时间，14 mA cm〜（-2）的电流密度，36和18 C g〜（-1）的合成石墨，天然石墨可以得到大约100％的电化学再生效率和回收的静脉石墨材料。相对较小的电能消耗，用于再生天然脉状石墨吸附剂的能量为24 J g〜（-1），而对于合成石墨吸附剂的能量为36 J g〜（-1），对于被吸附的酸性紫罗兰来说是必需的17在5个吸附/再生循环中，多个吸附/再生循环没有表现出吸附能力的损失。与基于石墨插层的吸附剂相比，使用天然和循环利用的静脉石墨吸附剂具有一些优势，可减少再生过程中的电能消耗并简化颗粒吸附剂的分离。电化学表面处理;表面化学;吸附;导电性和电化学性;再生

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