Photoadsorption and reaction mechanism of periwinkle shell ash in the removal of hazardous dye

IF 1.6 Q3 WATER RESOURCES Water Practice and Technology Pub Date : 2023-03-06 DOI:10.2166/wpt.2023.029
A. Nkwoada, G. Onyedika, E. Oguzie, M. Ogwuegbu
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Abstract

Combined adsorption and photocatalysis synergy was explored in this research because the porosity of activated carbon and hydroxyl radicals' generation are the main drivers of the adsorption and photodecomposition efficiency of dyes. In this study, periwinkle shell ash (PSA) activated at 800 °C was used for the adsorption of toxic crystal violet (CRV) dyes. The PSA was characterized by scanning electron microscope, Fourier transform infrared spectroscopy, thermogravimetric analysis, Brunauer–Emmett–Teller surface area analysis, and X-ray diffraction. Findings showed that CRV adsorption was dependent on the dosage, pH, contact time, and initial concentration. The adsorption capacity was 46.82 at pH (9) for CRV, dosage amount of 0.2 g/L, and an adsorbate concentration of 70 mg/L. Pseudo-second order gave a perfect fitting-chemisorption mechanism with values >0.98 (R2). Maximum photodegradation (93–98%) was achieved when the catalyst dosage increased to 0.75 g. Thermodynamics confirmed a spontaneous/exothermic process. The photocatalysis process confirmed that the combined process was effective and determined to be the rate-determining step by Langmuir–Hinshelwood. The study concluded that PSA was an efficient adsorbent, and TiO2 was a key factor in the reaction mechanism and recommended for potential synthesis of membrane substrates, high performance, efficiency, and cost reduction.
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长春花壳灰对有害染料的光吸附及反应机理
由于活性炭的孔隙率和羟基自由基的产生是染料吸附和光分解效率的主要驱动因素,因此本研究探索了吸附和光催化协同作用。在本研究中,在800°C下活化的长春花壳灰(PSA)用于吸附有毒结晶紫(CRV)染料。通过扫描电子显微镜、傅立叶变换红外光谱、热重分析、Brunauer–Emmett–Teller表面积分析和X射线衍射对PSA进行了表征。研究结果表明,CRV的吸附取决于剂量、pH、接触时间和初始浓度。在pH(9)、剂量为0.2g/L、吸附质浓度为70mg/L的条件下,CRV的吸附容量为46.82。伪二阶给出了一个完美拟合的化学吸附机制,其值>0.98(R2)。当催化剂用量增加到0.75 g时,实现了最大的光降解(93–98%)。热力学证实了自发/放热过程。光催化过程证实了联合过程的有效性,并被Langmuir–Hinshelwood确定为速率决定步骤。该研究得出结论,PSA是一种有效的吸附剂,TiO2是反应机理中的关键因素,并推荐用于潜在的膜基材合成,具有高性能、高效和降低成本的优点。
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来源期刊
CiteScore
2.30
自引率
6.20%
发文量
136
审稿时长
14 weeks
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