Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India.
Environ Sci Pollut Res Int. 2012 Jul;19(6):2055-62. doi: 10.1007/s11356-011-0699-6. Epub 2012 Jan 4.
Removal of malathion from agricultural runoff was studied using novel copper-coated chitosan nanocomposite (CuCH)-a biopolymeric waste obtained from marine industry.
Synthesis and characterization of the adsorbent using different spectral techniques like Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy, energy-dispersive X-ray spectroscopy, Brunauer, Emmett, and Teller surface analyzer have been carried out. Equilibrium studies have been carried out to optimize the dose rate, pH, and the reaction time. Parathion and methyl parathion removal were also evaluated by CuCH in the batch mode. Using gas chromatography-mass spectrometry (GC-MS) and FTIR studies suitable mechanism for adsorption has been suggested.
The particle size of the adsorbent ranged from 700 to 750 nm. The surface area was found to be 20 m(2) g(-1) with a pore volume of 0.11 cc g(-1). The maximum adsorption capacity of malathion by CuCH was found to be 322.6 ± 3.5 mg g(-1) at an optimum pH of 2.0. Presence of copper ions enhanced the adsorption capacity of the adsorbent. The reaction was found to follow pseudo second-order kinetics with a rate constant of 0.53 g mg(-1) min(-1). Evidence from FTIR indicated that copper ions form a dithionate complex with malathion during the adsorption stage. The adsorbent was found to remove malathion completely from spiked concentration of 2 mg l(-1) in the agricultural run-off samples. It was also found that CuCH removed other organophospurous pesticides like methyl parathion and parathion under prevailing conditions.
The results indicated that CuCH could be applied for the removal of organophosphorous pesticides.
使用新型铜包覆壳聚糖纳米复合材料（CuCH）——一种从海洋工业中获得的生物聚合物废物，研究从农业径流中去除马拉硫磷。
使用不同的光谱技术，如傅里叶变换红外光谱（FTIR）、扫描电子显微镜、能量色散 X 射线光谱、Brunauer-Emmett-Teller 表面分析仪，对吸附剂进行了合成和表征。进行了平衡研究，以优化剂量率、pH 值和反应时间。还通过 CuCH 在批处理模式下评估了对对硫磷和甲基对硫磷的去除。通过气相色谱-质谱（GC-MS）和 FTIR 研究，提出了合适的吸附机理。
吸附剂的粒径范围为 700-750nm。表面积为 20m²g⁻¹，孔体积为 0.11ccg⁻¹。CuCH 对马拉硫磷的最大吸附容量在最佳 pH 值为 2.0 时为 322.6±3.5mg g⁻¹。铜离子的存在增强了吸附剂的吸附能力。该反应被发现遵循拟二级动力学，速率常数为 0.53gmg⁻¹min⁻¹。FTIR 的证据表明，在吸附阶段，铜离子与马拉硫磷形成二硫代酸盐络合物。该吸附剂被发现可从农业径流样品中 2mg/L 的加标浓度中完全去除马拉硫磷。还发现 CuCH 在现有条件下还可去除其他有机磷农药，如甲基对硫磷和对硫磷。
结果表明，CuCH 可用于去除有机磷农药。
