摘要
以硫酸亚铁絮凝污泥为原料,硫酸为活化剂,制备了一种性能优异的吸附剂(简称SSXTY),可有效捕获冶炼烟气中的Hg^(0).H_(2)SO_(4)活化可以改善絮凝污泥吸附剂的孔隙结构,提高吸附剂表面活性氧和活性硫物种的含量,从而增强了吸附剂的脱汞活性.经H_(2)SO_(4)活化后,吸附剂的SO_(2)抗性大幅提高,能有效克服实际工况中SO_(2)的抑制作用.热解温度和H_(2)SO_(4)添加比例对吸附剂脱汞活性存在显著影响.SS25T650(H_(2)SO_(4)添加比例为0.25,热解温度为650℃)的脱汞性能最为优异,脱汞效率可达95.4%.利用絮凝污泥生产汞吸附剂可以降低吸附剂生产成本,并为絮凝污泥资源化利用提供了一条潜在途径.SSXTY的制备方法简单、成本低、SO_(2)抗性优异、脱汞性能优异,是一种具有应用前景的汞吸附剂.
A kind of adsorbent(SSXTY)with excellent performance on efficiently capturing Hg^(0) in smelting flue gas was prepared from ferrous sulfate-flocculated sludge with sulfuric acid activation.H_(2)SO_(4) activation could improve the adsorbent pore structure and increase the active surface oxygen/sulfur species,thus leading to the enhanced mercury removal activity of the adsorbent.Moreover,the SO_(2) resistance of the adsorbent was greatly improved,which could effectively overcome the inhibition effect of SO_(2) in actual working conditions.Pyrolysis temperature and H_(2)SO_(4) addition ratio showed significant effects on the mercury removal activity of adsorbent.SS25T650(H_(2)SO_(4) addition ratio of 0.25 and pyrolysis temperature of 650℃)exhibited the highest mercury removal efficiency(95.4%).Using flocculated sludge to produce mercury adsorbent not only reduces the adsorbent cost,but also provides a potential way for the resource utilization of flocculated sludge.SSXTY has the advantages of simple preparation method,low cost,excellent SO_(2) resistance and prominent mercury removal performance,thus showing promising application prospects.
作者
李鸿鹄
彭喜燕
安淼
李佳艺
曹艳晓
LI Hong-hu;PENG Xi-yan;AN Miao;LI Jia-yi;CAO Yan-xiao(Research Center for Environment and Health,Zhongnan University of Economics and Law,Wuhan 430073,China;School of Information and Safety Engineering,Zhongnan University of Economics and Law,Wuhan 430073,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2023年第11期5709-5718,共10页
China Environmental Science
基金
国家自然科学基金资助项目(52100134)
中南财经政法大学中央高校基本科研业务费专项资金资助(2722023BY020)。
关键词
硫酸活化
硫酸亚铁絮凝污泥
冶炼烟气
元素汞
机理
sulfuric acid activation
ferrous sulfate-flocculated sludge
smelting flue gas
elemental mercury
mechanism
