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红茶渣作为从水溶液中去除硝酸盐的绿色吸附剂

Black Tea Waste as Green Adsorbent for Nitrate Removal from Aqueous Solutions.

作者信息

Bondarev Andreea, Popovici Daniela Roxana, Călin Cătalina, Mihai Sonia, Sȋrbu Elena-Emilia, Doukeh Rami

机构信息

Chemistry Department, Petroleum-Gas University of Ploiesti, 39 Bucharest Blvd., 100680 Ploieşti, Romania.

National Institute for Research & Development in Chemistry and Petrochemistry ICECHIM, 060021 Bucharest, Romania.

出版信息

Materials (Basel). 2023 Jun 9;16(12):4285. doi: 10.3390/ma16124285.

DOI:10.3390/ma16124285
PMID:37374469
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10302076/
Abstract

The aim of the study was to prepare effective low-cost green adsorbents based on spent black tea leaves for the removal of nitrate ions from aqueous solutions. These adsorbents were obtained either by thermally treating spent tea to produce biochar (UBT-TT), or by employing the untreated tea waste (UBT) to obtain convenient bio-sorbents. The adsorbents were characterized before and after adsorption by Scanning Electron Microscopy (SEM), Energy Dispersed X-ray analysis (EDX), Infrared Spectroscopy (FTIR), and Thermal Gravimetric Analysis (TGA). The experimental conditions, such as pH, temperature, and nitrate ions concentration were studied to evaluate the interaction of nitrates with adsorbents and the potential of the adsorbents for the nitrate removal from synthetic solutions. The Langmuir, Freundlich and Temkin isotherms were applied to derive the adsorption parameters based on the obtained data. The maximum adsorption intakes for UBT and UBT-TT were 59.44 mg/g and 61.425 mg/g, respectively. The data obtained from this study were best fitted to the Freundlich adsorption isotherm applied to equilibrium (the values R = 0.9431 for UBT and R = 0.9414 for UBT-TT), this assuming the multi-layer adsorption onto a surface with a finite number of sites. The Freundlich isotherm model could explain the adsorption mechanism. These results indicated that UBT and UBT-TT could serve as novel biowaste and low-cost materials for the removal of nitrate ions from aqueous solutions.

摘要

本研究的目的是制备基于废弃红茶茶叶的高效低成本绿色吸附剂，用于去除水溶液中的硝酸根离子。这些吸附剂可通过对废弃茶叶进行热处理以生产生物炭（UBT-TT）获得，或者使用未经处理的茶叶废料（UBT）来制备便捷的生物吸附剂。通过扫描电子显微镜（SEM）、能量色散X射线分析（EDX）、红外光谱（FTIR）和热重分析（TGA）对吸附剂吸附前后进行表征。研究了pH、温度和硝酸根离子浓度等实验条件，以评估硝酸盐与吸附剂之间的相互作用以及吸附剂从合成溶液中去除硝酸盐的潜力。应用朗缪尔、弗伦德里希和坦金等温线，根据所得数据推导吸附参数。UBT和UBT-TT的最大吸附量分别为59.44 mg/g和61.425 mg/g。本研究获得的数据最符合应用于平衡的弗伦德里希吸附等温线（UBT的R值为0.9431，UBT-TT的R值为0.9414），这假定在具有有限数量位点的表面上进行多层吸附。弗伦德里希等温线模型可以解释吸附机制。这些结果表明，UBT和UBT-TT可作为新型生物废料和低成本材料用于去除水溶液中的硝酸根离子。

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