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首页> 外文期刊>RSC Advances >Dual role of coal fly ash in copper ion adsorption followed by thermal stabilization in a spinel solid solution
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Dual role of coal fly ash in copper ion adsorption followed by thermal stabilization in a spinel solid solution

机译：粉煤灰在铜离子吸附中的双重作用，然后在尖晶石固溶体中进行热稳定

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Coal fly ash is usually used as a cost-effective adsorbent for heavy metal removal, accumulating large amounts of spent coal fly ash that requires further disposal. In this study, fly ash that adsorbs copper with a maximum copper adsorption capacity of 48.8 mg g ~(?1) was further sintered at 900–1050 °C, and it was found that the copper is thermally incorporated in a spinel structure in aluminum- and iron-containing ceramic matrices provided by the fly ash. To further explore the immobilization mechanisms of copper in both aluminum- and iron-containing ceramic matrices like those in fly ash, two systems were prepared from CuO + Fe _(2) O _(3) + kaolinite and CuO + Fe _(2) O _(3) + Al _(2) O _(3) . A CuAl _(x) Fe _(2? x ) O _(4) spinel solid solution was formed, the peak intensity of which was found to increase upon an increase in the sintering temperature until a maximum amount was reached at 1150 °C. In the CuO + Fe _(2) O _(3) + Al _(2) O _(3) system, the 2 θ value of the CuAl _( x ) Fe _(2? x ) O _(4) peaks was found to increase due to the continuous engagement of aluminum in the spinel structure. However, iron was found to be more likely to react with the copper in CuO + Fe _(2) O _(3) + kaolinite during the formation of CuAl _( x ) Fe _(2? x ) O _(4) . Through effective adsorption of copper on coal fly ash and the subsequent copper stabilization in the spinel, this study found a dual role for fly ash in copper immobilization and further confirmed the potential to recycle waste coal fly ash as a marketable ceramic material.
机译：粉煤灰通常用作去除重金属的经济有效的吸附剂，会积聚大量需要进一步处理的废粉煤灰。在这项研究中，在900–1050°C下进一步烧结了最大吸附铜能力为48.8 mg g〜（？1）的粉煤灰，结果发现该铜热掺入铝中的尖晶石结构中-以及由粉煤灰提供的含铁陶瓷基体。为了进一步研究铜在粉煤灰中的含铝和含铁陶瓷基体中的固定化机理，从CuO + Fe _（2）O _（3）+高岭石和CuO + Fe _（2 ）O _（3）+ Al _（2）O _（3）。形成CuAl _（x）Fe _（2？x）O _（4）尖晶石固溶体，发现其峰值强度随烧结温度的升高而增加，直到在1150°C达到最大值。在CuO + Fe _（2）O _（3）+ Al _（2）O _（3）系统中，CuAl _（x）Fe _（2？x）O _（4）的2θ值发现由于铝在尖晶石结构中的连续接合而导致峰值增加。但是，发现在形成CuAl _（x）Fe _（2？x）O _（4）的过程中，铁更可能与CuO + Fe _（2）O _（3）+高岭石中的铜发生反应。 。通过有效地吸附煤粉煤灰上的铜并随后稳定尖晶石中的铜，这项研究发现了粉煤灰在固定铜中的双重作用，并进一步证实了将废粉煤灰作为可销售的陶瓷材料进行回收的潜力。

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