马尾藻脱锌生物吸附剂的制备及性能研究

IF 1 4区生物学 Q4 ECOLOGY

Marine Biology Research Pub Date : 2023-03-16 DOI:10.1080/17451000.2023.2193897

Jeba Sweetly Dharmadhas, Poornima Arumugam, Rajiv Periakaruppan

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引用次数: 0

摘要

废水中的重金属因其对环境的不安全性而成为一个问题。研究了褐藻对金属溶液中Zn2+离子的吸附特性。采用BET、DSC-TGA、近似和成分分析、零电荷点等多种方法对HCl预处理效果进行了表征。实验结果表明，在pH 5.5条件下，吸附60 min达到平衡，当金属浓度分别增加50 g/l和200 mg/l时，吸附量减少。在温度为30℃时吸附Zn2+的效率最高，当搅拌速度为150 rpm时，藻类生物量为0.5 g，吸附效率最高。结果表明，与未经处理的肉芽孢菌相比，经盐酸处理的吸附剂可以更有效地吸附金属溶液中的Zn2+。通过动力学研究对吸附动力学进行了评价，所得数据与其他模型相比最符合锌离子的伪二阶模型。观察到Freundlich等温线与平衡吸附数据吻合良好，锌的相关系数最高(r2 > 0.90)，而在Van 't Hoff图中，正值ΔH°，负值(ΔG°)和正值ΔS o表明固/溶界面的随机性增加，并且通过1/T vs ln Kc表示该过程是可行的和自发的。

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Preparation and characterization of biosorbent Sargassum myriocystum for zinc removal

ABSTRACT Heavy metal in wastewater is a problem due to its unsafe nature to the surroundings. The adsorption characteristics of brown algae Sargassum myriocystum for Zn2+ ions uptake from metal solutions was investigated. Among various algal pretreatment HCl was found to be the best and was characterized with various methods for example BET, DSC-TGA, proximate and composition analysis, and Point of zero charges. Experiments were performed and adsorption reaches equilibrium at 60 min at pH 5.5 and adsorbate dose decreased when increasing metal concentration 50 g/l and 200 mg/l, respectively. Maximum adsorption efficiencies of Zn2+ ions take place at temperature 30°C and 0.5 g of algae biomass was found to be optimal, with an agitation speed of 150 rpm. Our results suggest that HCl-treated adsorbent could be used as a more effective adsorbent than untreated S. myriocystum for the uptake of Zn2+ from metal solution. Kinetics study was performed for evaluating the sorption kinetics and the obtained data fit best to the pseudo-second-order model for zinc ion when compared with all other given models. It was observed that the Freundlich isotherm showed a good fit to the equilibrium sorption data and shows the highest correlation coefficient values (R 2 > 0.90) for zinc, whereas in Van’t Hoff plots a positive value of ΔH°, a negative value of the free energy (ΔG°) and a positive value of ΔS o showed increased randomness at the solid/solution interface as well as the process being feasible and spontaneous by plotting 1/T vs ln Kc .

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来源期刊

Marine Biology Research 生物-海洋与淡水生物学

CiteScore

2.10

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Marine Biology Research (MBRJ) provides a worldwide forum for key information, ideas and discussion on all areas of marine biology and biological oceanography. Founded in 2005 as a merger of two Scandinavian journals, Sarsia and Ophelia, MBRJ is based today at the Institute of Marine Research, Bergen, Norway. The Journal’s scope encompasses basic and applied research from all oceans and marine habitats and on all marine organisms, the main criterium for acceptance being quality.