研究了羟基磷灰石改性柚子皮(HPP)的制备及其对Cu2+的吸附性能,考察了反应时间、吸附剂用量、溶液离子强度、反应温度和pH对吸附效果的影响。结果表明,当Cu2+初始浓度为30μg/mg,溶液pH为6,吸附剂投加量为0.3g,吸附时间为200min,反应温度为25℃时,HPP吸附剂对模拟废水中Cu2+的吸附效果最好,吸附量可达48.8mg/g;而在更高浓度下,采用羟基磷灰石改性可使得柚子皮对Cu2+的吸附量从89.9mg/g提高到109.6mg/g。HPP的等温吸附规律用Freundlich模式可较好地描述,吸附性能良好,并且其吸附动力学规律较符合准二级动力学模型。
The preparation of hydroxyapatite modified pomelo peel(HPP) and its adsorption property to remove Cu2+ were studied.The factors of reaction time,adsorbent dosage,solution ionic strength,reaction temperature and pH on the adsorption effect were investigated.The results indicated that,the solution pH value was 6,adsorbent additive quantity was 0.3g,adsorption time of 200 min,the reaction temperature was 25℃,which was the best adsorption condition.When the initial concentration of copper ion was 30μg·mg-1,the adsorbed amount was 48.8mg·g-1,in higher concentrations,the adsorbed amount of copper ion by HPP can reach 109.6mg/g,higher than the adsorbed amount of copper ion by the unmodified pomelo peel (89.9mg·g-1).The adsorption of Cu2+ by HPP can be better described by the Freundlich isothermal equation,and the adsorption kinetics law conformed to pseudo-second-order kinetic equation.
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