首页|钼硫硒复合物吸附剂的制备及从冶炼烟气中捕获单质汞的机理

钼硫硒复合物吸附剂的制备及从冶炼烟气中捕获单质汞的机理

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  • 国家科技期刊平台
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为了实现冶炼烟气中气态单质汞的高效净化，本文采用硒硫阴离子复合策略制备了一系列钼硫硒复合物吸附剂(MoSxSey)材料。首先，采用SEM、TEM和EDS方法确定了MoSxSey的微观结构和元素成分;其次，采用XRD和Raman分析了MoSxSey的物相组成;第三，采用XPS技术确定了MoSxSey表面的元素价态;最后，研究了MoSxSey对Hg0 的吸附效率的影响，并评价其吸附性能。研究结果表明:制备的MoS0。5Se2。1吸附剂具备最佳的Hg0吸附性能，且在50～150℃的温度范围内保持了良好的Hg0吸附性能，最佳吸附效率和吸附速率可达97。86%和7。05 μg/(g·min);烟气中的O2和H2O会对MoS0。5Se2。1吸附剂产生抑制作用，但SO2可在一定程度上促进吸附剂对Hg0的吸附;当突破阈值为25%时，MoS0。5Se2。1对应的Hg0吸附容量高达47。1 mg/g，远高于其他常规吸附剂;在低温下(<100℃)，S2-n 和Se-S2-n 为主要的吸附位点，其与Hg0发生化学吸附，形成稳定的HgS和HgSe;而在高温下(>150℃)，仅Se-S2-n 是主要吸附位点，HgSe为主要的吸附产物;硒掺杂策略不仅可以增加吸附位点数量，而且可以提高吸附位点的热稳定性，从而实现了宽温度窗口下Hg0的高效脱除。
Preparation of molybdenum sulfoselenide composites adsorbent and capture mechanism of elemental mercury from smelting flue gas
In order to achieve efficient purification of gaseous elemental mercury in smelting flue gas,a series of molybdenum sulfoselenide composite adsorbents(MoSxSey)were prepared by selenium-sulfur anion composite strategy.Firstly,the microstructure and elemental composition of MoSxSey were determined by SEM,TEM and EDS.Secondly,the phase composition of MoSxSey was analyzed by XRD and Raman.Thirdly,the valence state of elements on the surface of MoSxSey was determined by XPS technique.Finally,the influence of MoSxSey on the adsorption efficiency of Hg0 was studied,and its adsorption performance was evaluated.The results show that the prepared MoS0.5Se2.1 adsorbent has the best Hg0 adsorption performance,and maintains good Hg0 adsorption performance in the temperature range of 50-150℃.The optimal adsorption efficiency and adsorption rate can reach 97.86%and 7.05 μg/(g·min),respectively.O2 and H2O in flue gas will inhibit the adsorption of MoS0.5Se2.1 adsorbent,but SO2 can promote the adsorption of Hg0 to a certain extent.When the breakthrough threshold is 25%,the Hg0 adsorption capacity of MoS0.5Se2.1 is as high as 47.1 mg/g,which is much higher than that of other conventional adsorbents.At low temperature(<100℃),S2-n and Se-S2-n are the main adsorption sites,which chemically adsorb Hg0 to form stable HgS and HgSe.At high temperature(>150℃),only Se-S2-n is the adsorption site,and HgSe is the main adsorption product.The selenium doping strategy can not only increase the number of adsorption sites,but also improve the thermal stability of the adsorption sites,thereby achieving efficient removal of Hg0 over a wide temperature window.

smelting flue gasmolybdenum sulfoselenideadsorptionelemental mercury

陈志康、刘翼瑄、阮泽晟、徐志峰、刘志楼

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江西理工大学冶金工程学院,江西赣州,341000

江西应用技术职业学院,江西赣州,341000

战略有色金属绿色低碳冶金江西省重点实验室,江西赣州,341000

冶炼烟气 钼硫硒复合物 吸附 单质汞

国家自然科学基金资助项目国家自然科学基金资助项目江西省主要学科学术技术带头人培养计划项目江西省杰出青年基金资助项目江西省双千计划项目江西省双千计划项目

523744135217433420212BCJ2300720224ACB214009jxsq2023201087jxsq2019201040

2024

10.11817/j.issn.1672-7207.2024.09.003

中南大学学报(自然科学版)
中南大学

中南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.938
ISSN：1672-7207
年,卷(期)：2024.55(9)