Disordered MoS2 Nanosheets with Widened Interlayer Spacing for Elemental Mercury Adsorption from Nonferrous Smelting Flue Gas,ACS ES&T Engineering

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Disordered MoS2 Nanosheets with Widened Interlayer Spacing for Elemental Mercury Adsorption from Nonferrous Smelting Flue Gas
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2021-06-16 , DOI: 10.1021/acsestengg.1c00156
Hui Liu _{1,

2} , Cao Liu ₁ , Kaisong Xiang _{1,

2,

3} , Chaofang Li ₁ , Xiaofeng Xie ₁ , Hao Chen ₁ , Pingshan Wang _{2,

3} , Fenghua Shen _{1,

2}

Affiliation

The development of a sorbent with a large elemental mercury (Hg⁰) adsorption capacity under a high SO₂ concentration atmosphere is the key point for mercury emission control from nonferrous smelting (NFS) flue gas. By controlling the degree of crystallization, oxygen incorporation and disorder engineering were simultaneously realized to improve the Hg⁰ adsorption capacity of MoS₂ nanosheets for the first time. The interlayer spacing of oxygen-incorporated MoS₂ nanosheets reaches up to 9.4 Å from 6.4 Å of normal MoS₂ nanosheets, which enhances the exposure of the active sites. Oxygen-incorporated MoS₂ nanosheets display a disordered structure, indicating the declined crystallinity and increased active sites. Benefiting from the above synergistic advantages, oxygen incorporation and structure disorder increases significantly the equilibrium Hg⁰ adsorption capacity of MoS₂ nanosheets to 16.26 mg·g^–1 under 6% SO₂ atmosphere, which is about 2.5 times larger than that of normal MoS₂ nanosheets. Both external mass transfer and chemisorption control Hg⁰ adsorption on MoS₂. Surface Mo⁵⁺ and S₂^2– act as the main active sites generated by disorder engineering for capturing Hg⁰, and HgS is the final product of Hg⁰ adsorption. The simultaneous optimization of structural and chemical properties in this work provides an effective and convenient strategy to improve the Hg⁰ adsorption capacity of MoS₂ nanosheets.

中文翻译：

具有加宽层间距的无序二硫化钼纳米片用于有色金属冶炼烟气中元素汞的吸附

开发在高 SO ₂浓度气氛下具有大元素汞 (Hg ⁰ ) 吸附能力的吸附剂是控制有色金属冶炼 (NFS) 烟气中汞排放的关键。通过控制结晶度，同时实现氧掺入和无序工程，首次提高了MoS ₂纳米片的Hg ⁰吸附能力。掺氧MoS ₂纳米片的层间距从普通MoS ₂纳米片的6.4 Å 达到9.4 Å ，这增强了活性位点的暴露。掺氧MoS ₂纳米片显示出无序结构，表明结晶度下降和活性位点增加。受益于上述协同优势，氧掺入和结构无序显着提高了MoS ₂纳米片在6% SO ₂气氛下的平衡Hg ⁰吸附容量至16.26 mg·g ^–1，约为普通MoS _{2 的}2.5倍纳米片。外部传质和化学吸附控制MoS ₂上的Hg ⁰吸附。表面 Mo ⁵⁺和 S ₂^2–作为无序工程产生的主要活性位点，用于捕获 Hg ⁰，HgS 是 Hg ⁰吸附的最终产物。该工作中结构和化学性质的同时优化为提高MoS ₂纳米片的Hg ⁰吸附能力提供了一种有效且方便的策略。

更新日期：2021-08-13

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