Civil Engineering Department, Priyadarshini Indira Gandhi College of Engineering, Nagpur, M.S., India.
Water Res. 2011 Oct 15;45(16):4769-81. doi: 10.1016/j.watres.2011.06.016. Epub 2011 Jun 28.
Magnetic binary oxide particles (MBOP) synthesized using chitosan template has been investigated for uptake capacity of arsenic (III). Batch experiments were performed to determine the rate of adsorption and equilibrium isotherm and also effect of various rate limiting factors including adsorbent dose, pH, optimum contact time, initial adsorbate concentration and influence of presence cations and anions. It was observed that uptake of arsenic (III) was independent of pH of the solution. Maximum adsorption of arsenic (III) was ∼99% at pH 7.0 with dose of adsorbent 1 g/L and initial As (III) concentration of 1.0 mg/L at optimal contact time of 14 h. The adsorption equilibrium data fitted well to Langmuir and Freundlich isotherm. The maximum adsorption capacity of adsorbent was 16.94 mg/g. With increase in concentration of Ca2+, Mg2+ from 50 mg/L to 600 mg/L, adsorption of As (III) was significantly reduced while for Fe3+ the adsorption of arsenic (III) was increased with increase in concentration. Temperature study was carried out at 293 K, 303 K and 313 K reveals that the adsorption process is exothermic nature. A distinct advantage of this adsorbent is that adsorbent can readily be isolated from sample solutions by application of an external magnetic field. Saturation magnetization is a key factor for successful magnetic separation was observed to be 18.78 emu/g which is sufficient for separation by conventional magnate.
壳聚糖模板合成的磁性双氧化物颗粒（MBOP）已被用于研究其对砷（III）的吸附能力。进行了批量实验以确定吸附速率和平衡等温线，以及各种速率限制因素的影响，包括吸附剂剂量、pH 值、最佳接触时间、初始吸附质浓度以及阳离子和阴离子的存在的影响。结果表明，砷（III）的吸附与溶液的 pH 值无关。在 pH 值为 7.0 时，吸附剂剂量为 1 g/L，初始砷（III）浓度为 1.0 mg/L，最佳接触时间为 14 h 时，砷（III）的最大吸附率约为 99%。吸附平衡数据很好地符合朗缪尔和弗伦德利希等温线。吸附剂的最大吸附容量为 16.94 mg/g。随着 Ca2+、Mg2+浓度从 50 mg/L 增加到 600 mg/L，砷（III）的吸附明显减少，而对于 Fe3+，随着浓度的增加，砷（III）的吸附增加。在 293 K、303 K 和 313 K 下进行的温度研究表明，吸附过程是放热的。这种吸附剂的一个明显优势是，通过施加外部磁场，可以将吸附剂从样品溶液中轻易分离出来。观察到饱和磁化强度是成功磁分离的关键因素，为 18.78 emu/g，足以通过常规磁铁进行分离。
