(1. 西安交通大學(xué) 能源與動力工程學(xué)院，西安 710049；
2. 江蘇泰斯特專業(yè)檢測有限公司，宿遷 223834；
3. 生態(tài)環(huán)境部華南環(huán)境科學(xué)研究所，廣州 510655；
4. 國家環(huán)境保護水環(huán)境模擬與污染控制重點實驗室，廣州 510655)
摘 要: 以非晶零價鐵(AZVI)為核心，采用液相還原法將AZVI負載到凹凸棒(ATP)表面制備凹凸棒負載非晶態(tài)零價鐵復(fù)合材料(ATP-AZVI)，考察其對Cr(Ⅵ)的去除特性；并通過掃描電子顯微鏡、原子力顯微鏡、X射線衍射儀和比表面積分析儀等手段對復(fù)合材料進行表征，驗證負載的可靠性及去除Cr(Ⅵ)機理。結(jié)果表明：非晶態(tài)零價鐵分散在凹凸棒的表面，團聚效應(yīng)得到緩解，相比于晶態(tài)零價鐵負載凹凸棒復(fù)合材料(ATP-ZVI)，ATP-AZVI的比表面積更大、親水性能更好。ATP-AZVI對Cr(Ⅵ)有很好的去除效果，反應(yīng)30 min即可去除97.4%的Cr(Ⅵ)，試驗也證明AZVI負載凹凸棒適用性很強。去除機理研究表明，ATP減緩了AZVI的團聚，加快了電子傳遞，Cr(Ⅵ)被還原成Cr(Ⅲ)后與Fe(Ⅲ)沉淀在材料表面，從而達到去除的目的。
關(guān)鍵字: 凹凸棒；非晶態(tài)零價鐵；負載；六價鉻；去除機理
（1. Department of Environmental Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
2. Jiangsu TST professional testing Co., Ltd., Suqian 223800, China;
3. South China Institute of Environmental Sciences, MEE, Guangzhou 510655;
4. State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, Guangzhou 510655）
Abstract:Amorphous zero-valent iron (AZVI) was loaded on the surface of attapulgite (ATP) by liquid phase reduction method to prepare ATP-loaded AZVI composite (ATP-AZVI). We investigated the removal characteristics of Cr(Ⅵ) by ATP-AZVI, and characterized the composite materials by means of scanning electron microscope(SEM), atomic force microscope(AFM), X-ray diffraction(XRD) and N2 adsorption-desorption measurement(BET) to verify the reliability of loading and the mechanism of Cr(Ⅵ) removal. The results show that the AZVI is dispersed on the surface of the attapulgite, and the agglomeration effect is relieved. Compared with the crystalline zero-valent iron loaded ATP composite (ATP-ZVI), ATP-AZVI has a larger specific surface area and better hydrophilic property. ATP-AZVI has good removal effect on Cr(Ⅵ), 97.4% of Cr(Ⅵ) can be removed after 30 min of reaction, and experiments proves that AZVI-loaded attapulgite has strong applicability. The removal mechanism study shows that ATP slows the agglomeration of AZVI and accelerates the electron transfer. Cr(Ⅵ) is reduced to Cr(Ⅲ) and then precipitates with Fe(Ⅲ) on the surface of the material, thus achieving the purpose of removal.
Key words: attapulgite; amorphous zero-valent iron; loading; Cr(Ⅵ); removal mechanism
