Bouraie Mohamed El, Abdelghany Amr
Central Laboratory for Environmental Quality Monitoring (CLEQM), National Water Research Center (NWRC), El Qanater El Khayria 13621, Egypt.
Chemical Engineering Department, Faculty of Engineering, Cairo University, Giza 12613, Egypt.
Polymers (Basel). 2020 Sep 7;12(9):2036. doi: 10.3390/polym12092036.
Commercial polyurethane foam was treated with salicylate salt to synthesize PUFSalicylate (PUFS) as a novel, promising, stable and inexpensive adsorbent for chlorpyrifos (CPF) extraction. The properties of PUFS were investigated using UV-Vis spectroscopy, apparent density, FTIR spectroscopy, pH, BET surface area, elemental analysis, TGA and DTG tests. Batch experiments were performed for the sorption of CPF under different salicylate concentrations, pH, shaking time, ionic strength, agitation speed, sorbent mass, batch factor and initial concentration of CPF. The results confirmed that 97.4% of CPF in a 25 mL solution, 10 μg/L concentration, could be retained by only 0.3 mg of PUFS (1:10mass ratio of PUFS: solution). In addition, the maximum capacity of PUFS for the sorption of CPF was 1249.8 μg/mg (3.9 × 10 mol/g) within 180 min. The negative values of ΔH° and ΔG° indicated that the sorption of CPF onto PUFS is an exothermic spontaneous process (favorable). The calculated data from the experimental procedures fitted perfectly with Freundlich isotherm (R = 0.9952) and the kinetic Equation of pseudo-second order. In addition, the R value in the Elovich Equation recorded higher when compared to the Morris-Weber and Bangham Equations; hence, the pore diffusion is not the rate-determining step. Thus, the use of PUFSalicylate for the removal of chlorpyrifos contaminations from agriculture runoff is applicable.
将商业聚氨酯泡沫用水杨酸盐处理，以合成新型、有前景、稳定且廉价的吸附剂——聚氨酯-水杨酸盐（PUFS），用于毒死蜱（CPF）的萃取。采用紫外可见光谱、表观密度、傅里叶变换红外光谱、pH值、比表面积分析仪（BET）表面积、元素分析、热重分析（TGA）和微商热重分析（DTG）测试等方法对PUFS的性能进行了研究。在不同水杨酸盐浓度、pH值、振荡时间、离子强度、搅拌速度、吸附剂质量、批次因子和CPF初始浓度条件下，进行了CPF吸附的批次实验。结果证实，在25 mL、浓度为10 μg/L的溶液中，仅0.3 mg的PUFS（PUFS与溶液的质量比为1:10）就能保留97.4%的CPF。此外，在180分钟内，PUFS对CPF的最大吸附量为1249.8 μg/mg（3.9×10 mol/g）。ΔH°和ΔG°的负值表明CPF在PUFS上的吸附是一个放热的自发过程（有利）。实验过程的计算数据与弗伦德里希等温线（R = 0.9952）和准二级动力学方程完美拟合。此外，与莫里斯-韦伯方程和班汉姆方程相比，埃洛维奇方程中的R值更高；因此，孔隙扩散不是速率决定步骤。因此，使用聚氨酯-水杨酸盐去除农业径流中的毒死蜱污染物是可行的。
