Mitigation of hazardous ammonia and hydrogen sulphide emissions using carbon based nanometal oxides adsorbents

IF 3 4区工程技术 Q3 CHEMISTRY, PHYSICAL Adsorption Pub Date : 2024-04-14 DOI:10.1007/s10450-024-00474-7

Guadalupe Montserrat Valdes Labrada, Ruth Azar, Bernardo Predicala, Mehdi Nemati

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Abstract

Carbon based nano TiO₂-ZnO composite adsorbents were developed and evaluated for simultaneous adsorption of ammonia (NH₃) and hydrogen sulphide (H₂S). Screening of composites with different ZnO and TiO₂ loadings in terms of adsorption capacities identified a composite with 10% ZnO and 5% TiO₂ (10ZnO-5TiO₂-AC) as the most suitable. Breakthrough experiments with pre-mixed gases containing 50 to 550 mg L^− 1 of each NH₃ and H₂S at 22 to 280 °C showed that increase in NH₃ and H₂S concentrations led to higher equilibrium adsorption capacities for both gases. Increase of temperature decreased NH₃ equilibrium adsorption capacity but for H₂S higher values were observed at higher temperatures. The highest equilibrium adsorption capacity of 5.71 mg NH₃ g^− 1 was obtained with a mixture of 500 ppmv NH₃ and 550 ppmv H₂S at 22 °C, while for H₂S the highest value of 29.64 mg H₂S g^− 1 was seen with a mixture of 300 ppmv NH₃ and 300 ppmv H₂S at 280 °C. Multicomponent Langmuir isotherm described the simultaneous adsorption of NH₃ and H₂S with the high level of accuracy. The negative value of enthalpy of adsorption for NH₃ confirmed the exothermic and potentially physical nature of ammonia adsorption, while a positive value for H₂S adsorption pointed out to the endothermic and chemisorption nature of this process. Examination of fresh and exposed composite adsorbents by XRD and FTIR confirmed the chemical nature of H₂S adsorption.

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利用碳基纳米氧化物吸附剂减少危险的氨和硫化氢排放

开发了碳基纳米 TiO2-ZnO 复合吸附剂，并对其同时吸附氨气（NH3）和硫化氢（H2S）的能力进行了评估。通过对不同氧化锌和二氧化钛负载量的复合材料的吸附能力进行筛选，确定了含 10% 氧化锌和 5% 二氧化钛的复合材料（10ZnO-5TiO2-AC）最为合适。在 22 至 280 °C的温度下，对含有 50 至 550 mg L- 1 NH3 和 H2S 的预混合气体进行的突破性实验表明，NH3 和 H2S 浓度的增加会导致这两种气体的平衡吸附容量增加。温度升高会降低 NH3 的平衡吸附容量，但 H2S 的平衡吸附容量在温度升高时会升高。500 ppmv NH3 和 550 ppmv H2S 的混合物在 22 °C 时的平衡吸附容量最高，为 5.71 mg NH3 g- 1，而 300 ppmv NH3 和 300 ppmv H2S 的混合物在 280 °C 时的 H2S 平衡吸附容量最高，为 29.64 mg H2S g- 1。多组分朗缪尔等温线高度精确地描述了 NH3 和 H2S 的同时吸附。NH3 的负吸附焓值证实了氨吸附的放热和潜在物理性质，而 H2S 的正吸附焓值则表明了这一过程的内热和化学吸附性质。通过 XRD 和 FTIR 对新鲜和暴露的复合吸附剂进行检查，证实了 H2S 吸附的化学性质。

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来源期刊

Adsorption 工程技术-工程：化工

CiteScore

8.10

自引率

3.00%

发文量

审稿时长

2.4 months

期刊介绍： The journal Adsorption provides authoritative information on adsorption and allied fields to scientists, engineers, and technologists throughout the world. The information takes the form of peer-reviewed articles, R&D notes, topical review papers, tutorial papers, book reviews, meeting announcements, and news. Coverage includes fundamental and practical aspects of adsorption: mathematics, thermodynamics, chemistry, and physics, as well as processes, applications, models engineering, and equipment design. Among the topics are Adsorbents: new materials, new synthesis techniques, characterization of structure and properties, and applications; Equilibria: novel theories or semi-empirical models, experimental data, and new measurement methods; Kinetics: new models, experimental data, and measurement methods. Processes: chemical, biochemical, environmental, and other applications, purification or bulk separation, fixed bed or moving bed systems, simulations, experiments, and design procedures.