Study on Adsorption of Cu2+,Pb2+and Zn2+by Natural Bentonite
作者单位：西南科技大学
学位级别：硕士
导师姓名：孙红娟
授予年度：2020年
学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学]
主 题：Waste Water Treatment Bentonite Heavy Hetals Adsorption
摘 要：The adsorption properties of clay minerals have been studied extensively in recent years,from the studies,montmorillonites have been considered as effective in the removal of metal ions from aqueous *** this thesis,the use of natural bentonite for the adsorption of copper（Cu2+）,lead（Pb2+）and zinc（Zn2+）ions from aqueous solution was *** of the bentonite clay interactions responsible for adsorption was studied using x-ray diffraction（XRD）,surface area and pore size（BET）,infrared spectroscopy（FT-IR）,SEM（Scanning electron microscope）,and x-ray fluorescence（XRF）.In this study,nitrate salts of copper,lead and zinc were used to prepare adsorbate solutions of Cu2+,Pb2+ and Zn2+.Batch adsorption experiment was used to determine the removal efficiencies of mixture of the target metals by bentonite clay with respect to operating conditions such as pH,metal concentration,and contact *** studies was conducted at different metal concentrations,with pH,contact time,rotary speed and temperature constant at 4,60 min,150 RMP and 25 □.The results of the equilibrium studies indicated a high efficiency of bentonite in the removal of Pb2+,Cu2+and Zn2+ions,with the highest removal for Cu2+ Pb2+and Zn2+being 98.59%,97.76%and 96.15%at optimum initial concentrations of 10 mg/L,15 mg/L and 10 mg/L *** to correlation coefficient,the obtained adsorption process could be better described with Langmuir isotherm *** maximum adsorption capacity of clay for Cu2+,Zn2+and Pb2+ions fitted with Langmuir isotherm was found to be 2.4,2.9 and 2.8 mg/g *** time studies were conducted using 60 mins to 300 *** results for 60 mins showed the highest%removal for all three metals with Cu2+recording 98.59%adsorption removal efficiency,Pb2+having 96.81%and Zn2+with 96.15%.The results in the paper proposed the potential role of natural bentonite clay obtained from Santai,China in wastewater treatment processes as an affordable,
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