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首页> 外文期刊>Journal of industrial and engineering chemistry >Synthesis of electrically conducting composite adsorbents for wastewater treatment using adsorption & electrochemical regeneration
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Synthesis of electrically conducting composite adsorbents for wastewater treatment using adsorption & electrochemical regeneration

机译：吸附与电化学再生法合成用于废水处理的导电复合吸附剂

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Electrically conducting adsorbent materials called Nyex~(TM) 1000 & 2000 have already been reported with comparatively low adsorption capacity for various organic, biologically non-degradable and toxic compounds. Two composite adsorbents called CA1 & CA2 were synthesized using synthetic graphite-carbon black and expanded graphite-carbon black respectively. The aim of developing the new adsorbents was to increase the adsorption capacity along with good electrical properties. The developed adsorbents were characterized using N2 adsorption for specific surface area, Boehm surface titration for surface chemistry, bed electrical conductivity, laser size analyzer for average particle size, and scanning electron microscope (SEM) for particle morphology and shape. Then both the composite adsorbents were tested for the adsorption of acid violet 17 followed by an electrochemical regeneration. The adsorption study revealed that both the adsorbents had almost similar kinetic behavior with a significant increase in adsorption capacity for acid violet 17 (300 & 26mg g~(-1) respectively) when compared with the adsorption capacity of previously developed electrically conducting materials called Nyex? 1000 & 2000 (3.5 and 9 mg g~(-1) respectively). The composite adsorbent CA2 was successfully electrochemically regenerated by passing an electric charge of 138 C g~(-1) at a current density of 14 mA cm~(-2) for a treatment time of 60 min, whereas, the composite adsorbent CA1 could not be regenerated successfully. The regeneration efficiencies of CA2 were obtained at around 120% during five adsorption-regeneration cycles. The amount of actual charge passed of 138 C g~(-1) for achieving 100% regeneration efficiency was found to be similar with stoichiometrically calculated amount of charge. The amount of electrical energy required to oxidize each mg of adsorbed acid violet onto CA2 (24 J mg~(-1)) was found to be significantly lower to that of Nyex? 1000 & 2000 adsorbents (52J mg~(-1) & 32J mg~(-1) respectively).
机译：已经报道了称为NyexTM 1000和2000的导电吸附材料，对各种有机的，生物不可降解的和有毒的化合物具有相对较低的吸附能力。分别使用合成石墨-炭黑和膨胀石墨-炭黑合成了两种复合吸附剂CA1和CA2。开发新的吸附剂的目的是增加吸附能力以及良好的电性能。使用比表面积的N2吸附，表面化学的Boehm表面滴定，床电导率，激光粒度分析仪（用于平均粒度）和扫描电子显微镜（SEM）来表征所开发的吸附剂的颗粒形态和形状。然后测试两种复合吸附剂对酸性紫17的吸附，然后进行电化学再生。吸附研究表明，与先前开发的称为Nyex的导电材料的吸附容量相比，两种吸附剂的动力学行为几乎相似，对酸性紫17（分别为300和26mg g〜（-1））的吸附容量显着增加。 ？ 1000和2000（分别为3.5和9 mg g〜（-1））。复合吸附剂CA2通过使138 C g〜（-1）的电荷以14 mA cm〜（-2）的电流密度通过60分钟的处理时间而成功地电化学再生，而复合吸附剂CA1可以无法成功重新生成。在五个吸附再生循环中，CA2的再生效率约为120％。发现为达到100％再生效率而通过的138 ​​C g〜（-1）的实际电荷量与化学计量计算的电荷量相似。发现将每毫克吸附的酸性紫氧化到CA2上所需的电能（24 J mg〜（-1））明显低于Nyex？的电能。 1000和2000种吸附剂（分别为52J mg〜（-1）和32J mg〜（-1））。

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