ABSTRACT The technology of alumina-extraction from coal ash provides an effective way for re-utilization of coal based solid waste as resource. However, one of the most serious challenges that this technology face is the harmless treatment of alumina-extracted residue (AR). Considering the structure and properties of AR, a scheme was proposed to make the AR as a potential sorbent for CO2, and in order to achieve enhanced CO2 adsorption performance, the AR was functionalized with (3-aminopropyl) triethoxysilane (APTES). Moreover, the effects of amine grafting amount and temperature on CO2 adsorption capacity of sorbents were investigated. The results show that at 25 °C and 100% CO2, the sample obtained by adding 12 mmol of APTES presented the maximum CO2 adsorption capacity of 1.23 mmol/g. The sorbent can be regenerated successfully at 110 °C and maintain a stable uptake in 5 repeated adsorption–desorption cycles. These results suggested that APTES functionalized alumina-extracted residue is a potential excellent sorbent for CO2 absorption.

中文翻译：

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催化气化煤灰氨基硅烷功能化氧化铝萃取残渣上的CO2捕集

摘要 煤灰提氧化铝技术为煤基固体废物资源化再利用提供了有效途径。然而，该技术面临的最严峻挑战之一是对氧化铝提取残留物 (AR) 的无害处理。考虑到 AR 的结构和性质，提出了一种方案，使 AR 作为 CO2 的潜在吸附剂，为了实现增强的 CO2 吸附性能，AR 用（3-氨基丙基）三乙氧基硅烷（APTES）进行了功能化。此外，还研究了胺接枝量和温度对吸附剂 CO2 吸附能力的影响。结果表明，在 25 ℃和 100% CO2 条件下，加入 12 mmol APTES 所得样品的最大 CO2 吸附容量为 1.23 mmol/g。吸附剂可以在 110 °C 下成功再生，并在 5 个重复的吸附-解吸循环中保持稳定的吸收。这些结果表明，APTES 功能化的氧化铝提取残留物是一种潜在的 CO2 吸收剂。