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首页> 外文期刊>Journal of the air & waste management association >Adsorption kinetics and modeling of H_2S by treated waste oil fly ash
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Adsorption kinetics and modeling of H_2S by treated waste oil fly ash

机译：处理后的废油粉煤灰对H_2S的吸附动力学和模拟

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Waste oil fly ash (OFA) collected from disposal of power generation plants was treated by physicochemical activation technique to improve the surface properties of OFA. This synthesized material was further used for potential hydrogen sulfide (H2S) adsorption from synthetic natural gas. The raw OFA was basically modified with a mixture of acids (20% nitric acid [HNO3] and 80% phosphoric acid [H3PO4]), and it was further treated with 2 M potassium hydroxide (KOH) to enhance the surface affinity as well as surface area of synthesized activated carbon. Correspondingly, it enhanced the adsorption of H2S. Crystallinity, surface morphology, and pore volume distribution of prepared activated carbon were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) analyses. Fourier transform infrared (FTIR) study was also performed to identify the functional groups during different synthesis stages of modified activated carbon. The Langmuir, Freundlich, Sips, and dual-site Langmuir (DSL) models were used to study the kinetic and breakthrough behavior of H2S adsorption over alkali-modified activated carbon. Modeling results of isotherms indicated that OFA has dual sites with high and low affinity for H2S adsorption. The Clark model, Thomas model, and Yoon-Nelson model were used to examine the effects of flow rate and inlet concentration on the adsorption of H2S. Maximum uptake capacity of 8.5 mg/g was achieved at 100 ppm inlet concentration and flow rate of 0.2L/min.Implications: Utilization of worthless oil fly ash from power plant is important not only for cleaning the environment but also for solid waste minimization. This research scope is to eradicate one pollutant by using another pollutant (waste ash) as a raw material. Chemical functionalization of synthesized activated carbon from oil fly ash would lead to attachment of functional groups of basic nature to attract the acidic H2S. Such type of treatment can enhance the uptake capacity of sorbent several times.
机译：通过物理化学活化技术处理从发电厂处置中收集的废粉煤灰（OFA），以改善OFA的表面性能。该合成材料还用于从合成天然气中吸附潜在的硫化氢（H2S）。原始OFA基本用酸（20％硝酸[HNO3]和80％磷酸[H3PO4]的混合物）进行改性，并用2 M氢氧化钾（KOH）进一步处理以提高表面亲和力，以及合成活性炭的表面积。相应地，它增强了H2S的吸附。使用X射线衍射（XRD），扫描电子显微镜（SEM）和Brunauer-Emmett-Teller（BET）分析研究了制备的活性炭的结晶度，表面形态和孔体积分布。还进行了傅里叶变换红外（FTIR）研究，以鉴定改性活性炭不同合成阶段的官能团。 Langmuir，Freundlich，Sips和双站点Langmuir（DSL）模型用于研究H2S在碱改性活性炭上的吸附动力学和突破行为。等温线的建模结果表明，OFA具有对H2S吸附具有高亲和力和低亲和力的两个位点。使用Clark模型，Thomas模型和Yoon-Nelson模型检查流速和入口浓度对H2S吸附的影响。在入口浓度为100 ppm且流速为0.2L / min时，最大吸收量达到8.5 mg / g。含义：利用发电厂产生的毫无价值的粉煤灰不仅对清洁环境非常重要，而且对于减少固体废物也很重要。该研究范围是通过使用另一种污染物（废灰）作为原料消除一种污染物。由粉煤灰合成的活性炭的化学功能化将导致碱性的官能团附着，从而吸引酸性H2S。这种类型的处理可以多次提高吸附剂的吸收能力。

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