Abstract

This study investigated the removal of phosphorus (PO₄⁻³-P) from water samples by SnO₂ and WO₃ nanoparticles (NPs). The effects of adsorbent dosage, pH, contact time and temperature with an initial concentration of 50 mg L⁻¹ of P were investigated. SEM-EDX, FTIR, XRD, and BET analyses were performed to characterize these nanoparticles. The results indicated that the maximum adsorption capacity of SnO₂ and WO₃ NPs was 21.5 and 19.0 mg g⁻¹, respectively and occurred at pH = 3. Within 40 min of operation, about 47.2% and 45.2% of P ion were removed from the solutions by SnO₂ and WO₃ NPs, respectively. The kinetics of P adsorption from solutions was analyzed by fitting the experimental data to the pseudo-first and second-order kinetic models. The result showed that the pseudo-second-order kinetics model provided much better R² values. In the multi-component solutions, in the presence of Cl⁻, NO₃⁻ and Cr₂O₇²⁻ ions, the adsorption rates decreased to (26.2% and 28.5%), (27.2% and 30.0%), and (48.0% and 33.0%) by SnO₂ and WO₃ NPs, respectively. Thermodynamic data (ΔG°< 0) fitting showed that the reactions of adsorption of P were spontaneous. In general, the nanoparticles of SnO₂ had better efficiency in the removal of phosphorous from water.

摘要

这项研究研究了通过SnO ₂和WO ₃纳米颗粒（NPs）从水样中去除磷（PO ₄ ^-3 -P ）的方法。研究了P初始浓度为50 mg L ^-1时吸附剂用量，pH，接触时间和温度的影响。进行SEM-EDX，FTIR，XRD和BET分析以表征这些纳米颗粒。结果表明，SnO ₂和WO ₃ NPs的最大吸附容量分别为21.5和19.0 mg g ^-1，并且发生在pH = 3的条件下。在运行40分钟内，从中去除了约47.2％和45.2％的P离子。 SnO ₂和WO ₃的解决方案NPs。通过将实验数据拟合到伪一级和二级动力学模型来分析溶液中P的吸附动力学。结果表明，拟二级动力学模型提供了更好的R ²值。在多组分溶液，在氯的存在^-，NO ₃ ^-和Cr ₂ ö ₇ ^2-离子时，吸附率下降到（26.2％和28.5％），（27.2％和30.0％），和（48.0分别由SnO ₂和WO ₃ NP组成（％和33.0％）。热力学数据（ΔG°<0）拟合表明P的吸附反应是自发的。通常，SnO ₂的纳米颗粒在从水中去除磷方面具有更好的效率。