摘要
通过考察不同过渡金属离子对K_2S_2O_8脱Hg性能的影响,建立了K_2S_2O_8与过渡金属离子协同脱Hg体系。实验结果表明:4种过渡金属离子的催化效应由高到低分别为Fe^(2+)>Co^(2+)>Cu^(2+)>Mn^(2+),K_2S_2O_8浓度为3 mmol/L,K_2S_2O_8与Fe^(2+)的摩尔比为3:1,反应温度为45℃时,Fe^(2+)/K_2S_2O_8体系的Hg脱除效果高达94.61%,Hg脱除效果最佳。p H值在3.5~9的范围内,随着p H值的升高,K_2S_2O_8,Fe^(2+)/K_2S_2O_8,Co^(2+)/K_2S_2O_8,Cu^(2+)/K_2S_2O_8和Mn^(2+)/K_2S_2O_8体系的脱除效率均有不同程度的下降,碱性环境对K_2S_2O_8以及K_2S_2O_8与过渡金属离子的协同体系脱Hg不利。同条件下,Cu^(2+)/K_2S_2O_8体系的Hg脱除效率保持在74.84%~78.26%之间,体系稳定性突出。入口Hg浓度的改变对各体系的脱Hg性能影响不大,抗冲击负荷能力较强。
In this paper, the influences of different kinds of transition metal complexes on the oxidizability of Hg by K2S2O8, was investigated and the system of K2S2O8 with transition metal complexes were established. The result showed that the catalytic performance of four kind of transition metal complexes in K2S2O8 from high to low is： Fe2＋ Co2＋ Cu2＋ Mn2＋. When the concentration of K2S2O8 is 3 mmol/L, the molar ratio of Fe（Ⅱ） to K2S2O8 is 1 ∶ 3, reaction temperature is 45 ℃, the system Fe2＋/K2S2O8 of gains the highest removal efficiency of Hg that is up to 94.61%. Within the range of value of p H from 2.5 to 9, the oxidizability of Hg by the system of K2S2O8,Fe2＋/K2S2O8,Co2＋/K2S2O8,Cu2＋/K2S2O8 and Mn2＋/K2S2O8 are declined. Basic environment is detrimental to Hg oxidation in K2S2O8 and systems of K2S2O8 with transition metal complexes. Under equivalent condition, the removal efficiency of Hg is within the range of 74.84% ~ 78.26%, the stability of Cu2＋/K2S2O8 system is the best. Mercury concentration has few effects on Hg oxidation in K2S2O8 and systems of K2S2O8 with transition metal complexes that possess stronger resist impact load capability.
出处
《环境科技》
2017年第4期7-12,共6页
Environmental Science and Technology
关键词
气态Hg
K2S2O8
过渡金属离子
模拟烟气
Gaseous mercury
Potassium persulfate
Transition metal complexes
Simulating flue gas
