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首页> 外文期刊>Separation and Purification Technology >Reactivity of Fe/M(M=Ce,Mn,Al)oxide-hydroxides for hydrosulfide removal in anoxic and oxic solutions
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Reactivity of Fe/M(M=Ce,Mn,Al)oxide-hydroxides for hydrosulfide removal in anoxic and oxic solutions

机译：Fe / M（M = Ce，Mn，Al）-氢氧化物在缺氧和有氧溶液中脱除硫化氢的反应活性

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摘要

The reactivity toward hydrosulfide(HS~-)of seven iron-containing oxide-hydroxides(FeMOx)with different Fe/M(M=Ce,Mn,Al)molar ratios(0.9,0.5,0.1)was studied for alkaline pH in a batch slurry reactor to identify the fittest material aimed at the removal of H2S from the pulp and paper atmospheric effluents.The materials were optimized by varying the calcination temperature to maximize the surface area.FeAlOx0.9 achieved the highest surface area(286.8 m2/g),followed by FeCeOx0.9(241.5 m2/g)and FeMnOx0.9(217.9 m2/g).In anoxic solutions,combination of Fe with small amounts of Ce or Mn improved HS~ oxidation.Increasing Mn(respectively,Fe)content in FeMnOx(respectively,FeCeOx)increased HS~-conversion both in oxic and anoxic solutions.The majority of FeMOx showed improved reactivity towards HS~-in oxic conditions while dissolved oxygen(DO2)accelerated HS~-conversion by re-oxidizing Fe(II)to active Fe(III)as well as by homogeneously converting the polysulfides into thiosulfate.The gain in efficiency of FeCeOx in oxic versus anoxic environments correlated negative-linearly with the Fe/Ce ratio,and Ce was found to enhance the electron transfer between Fe(II)sites and DO2.The gain in efficiency of FeMnOx in oxic versus anoxic solutions correlated linearly with Fe/Mn ratio suggesting reoxidation for Fe(II)and Mn(II)to occur at different rates.Therefore,even if Mn exhibited superior reactivity toward HS~-than Fe,the greater reoxidation ability of Fe(II)elects FeCeOx materials for a redox-scrubbing process aiming at the removal of H2S from Kraft atmospheric effluents.
机译：研究了七个不同Fe / M（M = Ce，Mn，Al）摩尔比（0.9,0.5,0.1）的含铁氧化物氢氧化物（FeMOx）在碱性pH条件下对氢硫化物（HS〜-）的反应性。间歇式浆液反应器以鉴定最合适的材料，旨在从纸浆和造纸的大气废水中去除H2S。通过改变煅烧温度以使表面积最大化来对材料进行优化.FeAlOx0.9达到最高表面积（286.8 m2 / g） ），接着是FeCeOx0.9（241.5 m2 / g）和FeMnOx0.9（217.9 m2 / g）。在缺氧溶液中，Fe与少量Ce或Mn的结合可改善HS〜氧化。增加Mn（分别为Fe） FeMnOx（分别为FeCeOx）的含量在有氧和无氧溶液中均会提高HS〜-转化率。大多数FeMOx在有氧条件下均表现出对HS〜-的反应性，而溶解氧（DO2）通过重新氧化Fe加速了HS〜-转化。 （II）活化Fe（III）以及通过将多硫化物均匀转化为硫代硫酸盐。 FeCeOx在有氧和无氧环境中的发生率与Fe / Ce比率呈负线性相关，并且发现Ce增强了Fe（II）位和DO2之间的电子转移。FeMnOx在有氧和无氧溶液中的效率增益呈线性相关。 Fe / Mn比表明Fe（II）和Mn（II）的再氧化速率不同。因此，即使Mn对HS〜-的反应性比Fe高，Fe（II）的重氧化能力也会使FeCeOx材料产生旨在从牛皮纸大气废水中去除H2S的氧化还原洗涤工艺。

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