Fan Yun, Zhang Fu-Shen, Feng Yinan
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, China.
J Hazard Mater. 2008 Nov 30;159(2-3):313-8. doi: 10.1016/j.jhazmat.2008.02.020. Epub 2008 Feb 16.
A new adsorbent was developed from waste ash resulting from municipal solid waste and coal co-combustion power plant. The ash was firstly subjected to hydrothermal treatment for zeolite synthesis, and then modified with iron(II) ions by agitation (ISZ) or ultrasonic (UISZ) treatment. The effect of operating factors such as pH, contact time, initial As(V) concentration and adsorbent dosage was investigated and the optimum operating conditions were established. The adsorption capacity for As(V) onto UISZ and ISZ were 13.04 and 5.37 mg g(-1), respectively. The adsorption isotherm data could be well described by Langmuir isotherm model. The optimum initial pH values for As(V) removal were 2.5 and 2.5-10.0 by ISZ and UISZ, respectively. The results indicated that ultrasound treatment scattered the particles of the adsorbent uniformly, which was in favor of impregnating iron ions into pores. Leaching of hazardous elements from the used adsorbents was very low. Accordingly, it is believed that the adsorbents developed in this study are environmentally acceptable and industrially applicable for utilization in arsenic-containing wastewater treatment.
一种新型吸附剂由城市固体废物与煤共燃发电厂产生的废灰研制而成。首先对该灰进行水热处理以合成沸石，然后通过搅拌（ISZ）或超声（UISZ）处理用亚铁离子进行改性。研究了pH值、接触时间、初始As(V)浓度和吸附剂用量等操作因素的影响，并确定了最佳操作条件。UISZ和ISZ对As(V)的吸附容量分别为13.04和5.37 mg g(-1)。吸附等温线数据可用Langmuir等温线模型很好地描述。ISZ和UISZ去除As(V)的最佳初始pH值分别为2.5和2.5 - 10.0。结果表明，超声处理使吸附剂颗粒均匀分散，有利于铁离子浸渍到孔中。使用过的吸附剂中有害元素的浸出量非常低。因此，认为本研究开发的吸附剂在环境上是可接受的，并且在工业上可应用于含砷废水处理。
