Evaluation of vermicompost as a raw natural adsorbent for adsorption of pesticide methylparathion
Evaluation of vermicompost as a raw natural adsorbent for adsorption of pesticide methylparathion
复制标题
DOI：
10.1080/09593330.2011.554890
复制
发表时间：
2012-01
影响因子：
2.8
通讯作者：
Camila Bitencourt Mendes;Giovana de Fátima Lima;Vanessa N. Alves;N. Coelho;D. Dragunski;C. Tarley
中科院分区：
文献类型：
--
作者：
Camila Bitencourt Mendes;Giovana de Fátima Lima;Vanessa N. Alves;N. Coelho;D. Dragunski;C. Tarley
通过批式和柱式实验，研究了蚯蚓粪（VC）作为一种低成本的替代吸附剂对水介质中农药甲基对硫磷（MP）的去除效果。采用Doehlert设计对MP吸附的平衡时间（61.5 min）和吸附pH（6.8）进行了优化。吸附试验后的初始和最终MP浓度测定方波吸附阴极溶出伏安法使用的电极组成的多壁碳纳米管分散在矿物油中。批吸附实验数据符合Langmuir和Freundlich等温吸附，并且非常好地符合Langmuir线性模型，得到最大吸附容量（MAC）为0.17 mg g−1。这一结果与柱实验所得结果非常相似。为了评价MP从柱填充VC中的解吸，已通过材料对100.0 ml硝酸溶液（pH 3.0）进行了纯化。没有观察到MP的浸出，从而证实MP和VC之间的强相互作用。VC具有良好的MAC性能和较低的成本，是一种可靠的去除废水中MP的天然材料。
The assessment of vermicompost (VC) as a low-cost and alternative adsorbent for the removal of the pesticide methylparathion (MP) from an aqueous medium has been investigated by batch and column experiments. Parameters related to MP adsorption, i.e. equilibrium time (61.5 min) and adsorption pH (6.8) were optimized by using Doehlert design. The initial and final MP concentrations after adsorption assays were determined by square-wave adsorptive cathodic stripping voltammetry using an electrode composed of a multiwalled carbon nanotube dispersed in mineral oil. Batch adsorption experimental data were fitted to the Langmuir and Freundlich isotherm adsorptions, and a very good fit to the Langmuir linear model, giving a maximum adsorption capacity (MAC) of 0.17 mg g−1. This result was very similar to that obtained with the column experiments. In order to evaluate the MP desorption from column packed VC, 100.0 ml of nitric acid solution (pH 3.0) has been percolated through material. No leaching of MP was observed, thus confirming the strong interaction between MP and VC. The satisfactory MAC obtained and low cost makes the VC a reliable natural material for the removal of MP from aqueous effluents.