Olive mill solid residues as heavy metal sorbent material: a preliminary study.
Olive mill solid residues as heavy metal sorbent material: a preliminary study.
复制标题
橄榄磨固体残渣作为重金属吸附剂材料：初步研究。
DOI：
10.1016/s0956-053x(02)00086-7
复制
发表时间：
2002
期刊：
影响因子：
8.1
通讯作者：
F. Vegliò
中科院分区：
文献类型：
--
作者：
F. Pagnanelli;L. Toro;F. Vegliò
生物吸附重金属是一种创新的替代技术，利用农业和工业废物，藻类和细菌等非活性和死亡的生物质从水溶液中去除这些污染物。在这项研究中，橄榄磨固体残渣被用作重金属吸附材料，其广泛的可用性作为农业废物，也为它的纤维素基质，丰富的潜在的金属结合活性位点。初步研究涉及不同的重金属（汞，铅，铜，锌和镉）的去除，水和正己烷预处理的效果和再生的可能性。橄榄磨固体残留物能够从水溶液中去除重金属，其亲和性系列反映了金属离子的水解性质，但对铜也具有特定的亲和性。可以推测，生物吸附现象是通过一般的离子交换机制结合特定的络合反应发生的。根据法律限制，水预处理足以减少流出物中的COD释放，而正己烷预处理也强烈降低了该材料的吸附性能。在不同的操作条件下获得的实验等温线拟合使用非线性回归方法的Langmuir参数的估计。此外，一个简单的Scatchard图分析进行了初步调查的活性位点，显示存在两个不同的网站亲和力取决于金属浓度，根据先前的假设的两种吸收机制的铜生物吸附。再生试验在再生产率和浓缩比方面给出了良好的结果。
Biosorption of heavy metals is an innovative and alternative technology to remove these pollutants from aqueous solutions using inactive and dead biomasses such as agricultural and industrial wastes, algae and bacteria. In this study olive mill solid residue was used as heavy metal adsorbent material for its wide availability as agricultural waste and also for its cellulosic matrix, rich of potential metal binding active sites. Preliminary studies concerned with the removal of different heavy metals (Hg, Pb, Cu, Zn and Cd), the effect of pre-treatments by water and n-hexane and the regeneration possibility. Olive mill solid residue resulted able to remove heavy metals from aqueous solutions with an affinity series reflecting the hydrolytic properties of the metallic ions, but also a particular affinity for copper. It can be supposed that biosorption phenomenon occur by a general ion exchange mechanism combined with a specific complexation reaction for copper ions. Water pre-treatment is sufficient to reduce COD release in the effluent according to the law limit, while n-hexane pre-treatment strongly reduces also the adsorption properties of this material. Experimental isotherms obtained under different operating conditions were fitted using a non linear regression method for the estimation of the Langmuir parameters. Moreover a simple Scatchard plot analysis was performed for a preliminary investigation of the active sites, showing the presence of two different site affinities depending on the metal concentration, according to the previous hypothesis of two kinds of uptake mechanisms for copper biosorption. Regeneration tests gave good results in terms of yield of regeneration and also concentration ratios.