羧甲基化沙柳木粉负载纳米零价铁对水中Pb2 的吸附性能

Adsorption Properties of Pb2 in Aqueous Solution By Carboxymethyl Salix Psammophila Powder Supported Nanoscale Zero-Valent Iron

摘要:

以羧甲基化沙柳木粉（CMS）为载体，采用液相还原法制备羧甲基化沙柳木粉负载纳米零价铁（NZVI/CMS）吸附剂。采用扫描电镜（SEM）、傅里叶红外光谱（FTIR）、X射线衍射（XRD）和透射电镜（TEM）对纳米零价铁（NZVI）和NZVI/CMS的微观结构进行表征。研究了不同吸附条件（吸附剂投加量、Pb2 初始浓度、吸附时间、吸附温度、Pb2 溶液pH值等因素）对CMS和NZVI/CMS吸附Pb2 性能的影响。表征结果显示：NZVI成功负载在了CMS上，负载之后的NZVI的分散性明显提高，团聚现象得到了有效的解决，CMS起到了分散NZVI颗粒的作用。吸附结果显示：当CMS和NZVI/CMS的投加量分别为0.05 g和0.01 g，Pb2 初始浓度为600 mg?L-1和400 mg?L-1，吸附时间均均为120 min，吸附温度为30℃，Pb2 溶液pH值分别为4.5和4.0时，CMS和CMS-NZVI对Pb2 的吸附量最大，分别为390.30 mg?g-1和535.50 mg?g-1。

Abstract:

The carboxymethyl salix psammophila powder(CMS) as carrier, the carboxymethyl salix psammophila powder supported nanoscale zero-valent iron(NZVI/CMS) was prepared by using liquid phase reduction method. The micro structures of nanoscale zero- valent iron(NZVI) and NZVI/CMS were characterized by means of SEM, FTIR, XRD and TEM. The effects of the adsorbent dosage, initial concentration of Pb2 , adsorption time, adsorption temperature and pH on adsorption properties of NZVI and NZVI/CMS for Pb2 were studied. The characterization results show that NZVI was loaded on the CMS successfully, and the NZVI were scattered obviously on CMS, reunion phenomenon had been resolved effectively, CMS played a role in dispersing NZVI particles.The adsorption results showed that the adsorption capacities of NZVI and NZVI/CMS reached a maximum of 390.30 mg?g-1 and 535.50 mg?g-1 as the dosage was 0.05 g and 0.01 g respectively, the initial concentration of Pb2 was 600 mg?L-1 and 400 mg?L-1, the adsorption time was 120min, the adsorption temperature was 30℃ and the pH of Pb2 solution was 4.5 and 4.0 respectively.