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Mercury vapor adsorption and sustainable recovery using novel electrothermal swing system with gold-electrodeposited activated carbon fiber cloth
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2020-11-18 , DOI: 10.1016/j.jhazmat.2020.124586
Hua-Yung Liao , Shu-Yuan Pan , Shu-Wen You , Chia-Hung Hou , Can Wang , Ji-Guang Deng , Hsing-Cheng Hsi

A novel electrothermal swing (ETS) system with gold-electrodeposited activated carbon fiber cloth (GE-ACFC) was developed to adsorb and sustainably recover low-concentration Hg0. GE-ACFC with an Au growth time of 1200 s displayed the largest Hg0 adsorption capacity and >90% removal efficiency. The Hg0 adsorption of GE-ACFC was dominated by physisorption via Au amalgamation. In contrast, Hg adsorption of untreated ACFC (RAW-ACFC) was mainly controlled by physisorption and chemisorption related to carbonyl groups. Nevertheless, both ACFCs could reach 100% ETS Hg0 regeneration. The Hg re-adsorption of GE-ACFC was stable, with efficiency > 90% at different regeneration temperatures in three-cycle ETS experiments, but the Hg re-adsorption efficiencies of RAW-ACFC greatly decreased to only 60% after 250℃ regeneration, due to the formation of electrothermal hot spots in the ACFC. Because the thermal and electrical conductivity of GE-ACFC increased due to Au electrodeposition, the presence of electrothermal hot spots in GE-ACFC-1200s was minor. Simulation results showed that both pseudo-first-order and pseudo-second-order models fitted well to the desorption patterns of the GE-ACFC. Mass transfer model further suggested that intraparticle diffusion control was the rate-limiting step, with diffusion coefficients increased from the first to the third cycle for GE-ACFC.



中文翻译:

新型电热摆动系统结合金电沉积活性炭纤维布对汞蒸气的吸附和可持续回收

开发了一种新的电热摆动(ETS)系统,该系统采用金电沉积活性炭纤维布(GE-ACFC)来吸附和可持续地回收低浓度的Hg 0。Au生长时间为1200 s的GE-ACFC表现出最大的Hg 0吸附能力和> 90%的去除效率。GE-ACFC对Hg 0的吸附主要是通过Au汞齐化进行的物理吸附。相反,未经处理的ACFC(RAW-ACFC)对Hg的吸附主要受与羰基有关的物理吸附和化学吸附控制。但是,两种ACFC都可能达到100%ETS Hg 0再生。在三循环ETS实验中,GE-ACFC对Hg的重吸收稳定,效率在90%以上,但是在250℃再生后,RAW-ACFC对Hg的重吸收效率大大降低,仅为60%。由于ACFC中形成了电热热点。由于由于Au电沉积而使GE-ACFC的导热性和导电性增加,因此GE-ACFC-1200s中电热热点的存在很小。仿真结果表明,伪一阶模型和伪二阶模型都非常适合GE-ACFC的解吸模式。传质模型进一步表明,颗粒内扩散控制是限速步骤,GE-ACFC的扩散系数从第一个循环增加到第三个循环。

更新日期:2020-11-18
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