摘要
高铁酸钾具有极强的氧化能力,在溶液中可被还原生成Fe3+,Fe3+水解形成各种羟基铁水合配合物,具有良好混凝与吸附性能。对采用次氯酸钙氧化法制备的高铁酸钾进行傅里叶红外光谱(FTIR)、X-射线衍射(XRD)和扫描电镜(SEM)表征。傅里叶红外光谱与X-射线衍射图谱分析表明,自制高铁酸钾具有明显Fe-O键特征吸收峰,且晶胞参数与高铁酸钾标准衍射卡的晶胞参数基本一致;扫描电镜分析显示,该高铁酸钾表面凹凸不平,形成了错综复杂的蜂窝状孔隙,具有较多吸附空位。以Mn(Ⅱ)离子为目标污染物,自制高铁酸钾为药剂,研究采用高铁酸钾氧化?混凝一体化新工艺处理模拟含Mn(Ⅱ)废水。考察了投加量、Mn(Ⅱ)初始浓度、初始pH值和静置时间对去除效果的影响。结果表明:最佳氧化-混凝一体化新工艺条件为高铁酸钾投加量为9.8 mg·L^(-1),Mn(Ⅱ)初始浓度为15 mg·L^(-1),初始pH值为9.0,静置时间为60 min;处理后出水Mn(Ⅱ)浓度低于0.4400 mg·L^(-1),去除率达到97.07%。
Based on the strong oxidizing ability of potassium ferrate,it can be reduced to produce Fe^（3＋） in solution,and Fe^（3＋） hydrolyzes to form various hydroxy iron hydrate complexes with good coagulation and adsorption properties.The self-made potassium ferrate was characterized by Fourier transform infrared spectroscopy（ FTIR）,X-ray diffraction（ XRD） and scanning electron microscopy（ SEM）. FTIR and X-ray diffraction analysis showed that the self-made potassium ferrate had a distinct characteristic absorption peak of Fe-O bond,and the unit cell parameters were basically consistent with the unit cell parameters of the potassium ferrate potassium standard diffraction card; SEM analysis showed that the surface of the potassium ferrate was uneven,forming intricate honeycomb-like pores with more adsorption vacancies.Taking Mn（Ⅱ） ions as target pollutants,the self-made potassium ferrate was used as a reagent,and a new integrated potassium ferrate-oxidation-coagulation process was used to treat simulated Mn（Ⅱ）-containing wastewater.The effect of dosing amount,initial concentration of Mn（Ⅱ）,initial pH value and standing time on the removal effect was examined.The results showed that the optimum conditions for the integration of oxidation-coagulation were the addition of potassium ferrate 9. 8 mg·L^（-1）,the initial concentration of Mn（Ⅱ） 15 mg·L^（-1）,the initial pH value of 9. 0,and the standing time 60 min; After the treatment,the effluent Mn（Ⅱ） concentration was lower than 0. 4400 mg·L^（-1）,and the removal rate reached 97. 07%.
作者
张鹏
王雨露
赵冬琴
ZHANG Peng;WANG Yulu;ZHAO Dongqin(College of Civil Engineering,Hunan University of science＆technology,Xiangtan 411201,China)
出处
《化学研究与应用》
CAS
CSCD
北大核心
2018年第6期1015-1020,共6页
Chemical Research and Application
基金
国家自然科学基金资助项目(NO.41502331)
湖南省自然科学基金资助项目(NO.2018JJ3174)
