Single and competitive adsorption of Cu2+ and Pb2+ by tea pulp from aqueous solutions

IF 1.3 Q4 ENVIRONMENTAL SCIENCES Environmental Health Engineering and Management Journal Pub Date : 2021-12-26 DOI:10.34172/ehem.2022.08
A. Pasgar, Alireza Nasiri, N. Javid
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引用次数: 7

Abstract

Background: Removal of heavy metals by bioadsorbents is one of the effective and inexpensive methods for water and wastewater treatment. The aim of this study was to investigate the ability of tea pulp in order to remove Cu+2 and Pb+2 metals in two states of adsorption (single element and two elements) from aqueous solutions. Methods: Experiments were performed on synthetic and real samples at ambient temperature. The effect of solution pH, adsorbent dose, contact time, and initial concentration on single and competitive removal of copper metals and lead was studied. Adsorption kinetics and adsorption isotherms were analyzed by pseudo-second-order kinetic equations, Elovich model and intraparticle diffusion, Freundlich and Langmuir equations, respectively. Results: The maximum adsorption capacity for copper and lead was observed at pH=5-8 and pH=4-8, respectively. Maximum adsorption capacity for copper and lead by tea pulp in single-element solution (single) was 37.17 and 48.54 mg/g and in two-element solution (competitive), was 28.41 and 43.47 mg/g, respectively. The adsorption reaction of heavy metals by tea pulp followed the Longmuir isotherm and pseudo-second-order kinetic models. Conclusion: Tea pulp as an inexpensive bioadsorbents is able to remove about one-third of the copper, and approximately, half of lead from aqueous solutions, so its use in the treatment of aqueous solutions will be beneficial.
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茶浆对水溶液中Cu2+和Pb2+的单次和竞争性吸附
背景:生物吸附剂去除重金属是一种有效且廉价的水和废水处理方法。研究了茶浆在两种吸附状态下(单元素和双元素)对水溶液中Cu+2和Pb+2金属的去除能力。方法:在常温下对合成样品和真实样品进行实验。研究了溶液pH、吸附剂剂量、接触时间和初始浓度对铜金属和铅的单次和竞争性去除的影响。采用拟二级动力学方程、Elovich模型和Freundlich方程、Langmuir方程分析了吸附动力学和吸附等温线。结果:pH=5 ~ 8和pH=4 ~ 8时,对铜和铅的吸附量最大。茶浆对铜和铅的最大吸附量在单元素溶液(single)中分别为37.17和48.54 mg/g,在双元素溶液(competitive)中分别为28.41和43.47 mg/g。茶叶浆对重金属的吸附反应符合龙缪尔等温线和拟二级动力学模型。结论:茶浆作为一种廉价的生物吸附剂,可以去除水溶液中约三分之一的铜和约一半的铅,因此将其用于水溶液的处理将是有益的。
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来源期刊
CiteScore
2.40
自引率
37.50%
发文量
17
审稿时长
12 weeks
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