Enhanced adsorption of phosphate by loading nanosized ferric oxyhydroxide on anion resin

Ferric oxyhydroxide loaded anion exchanger （FOAE） hybrid adsorbent was prepared by loading nanosized ferric oxyhydroxide （FO） on anion exchanger resin for the removal of phosphate from wastewater. TEM and XRD analysis confirmed the existence of FO on FOAE. After FO loading, the adsorption capacity of the hybrid adsorbent increased from 38.70 to 51.52mg.g-1. Adsorption processes for both FOAE and anion resin were better fit to the pseudo first order model. Batch adsorption experiments revealed that higher temperature （313K）, higher initial phosphate concentration （50 mg.L-1） and lower solution pH （pH value of 2） would be more propitious to phosphate adsorption. Competition effect of coexisting anions on phosphate removal can be concluded as sulfate 〉 nitrate 〉 chloride. Freundlich isotherm model can describe the adsorption of phosphate on FOAE more accurately, which indicated the heterogeneous adsorption occurred on the inner-surface of FOAE.     

南极麦克斯韦尔海湾阴离子洗涤剂污染研究

首次报道了南极麦克斯韦尔海湾海域阴离子洗涤剂污染的变化和分布状况。研究海域水体阴离子洗涤剂含量在0.148～0.997mg/L之间,若按中国国内地表水水质标准0.3mg/L评价,全部20个站次中有6站次超过标准,超标率达30％,表明该地区已有一定程度的阴离子洗涤剂污染。主要污染源是各考察站的生活污水。     

离子色谱法对阴离子分析方法的探讨

通过选择放大倍数、确定样品稀释倍数、加标回收等不同条件,运用离子色谱法对降水、饮用水、地表水中的F-,CL-,NO-2,NO-3加4进行了大量的实验分析。方法具有良好的线性(相关系数在0.9991～0.9997)和重复性(相对标准偏差小于1.9%),NO-3,SO2-标平均回收率为98.6%。方法简便实用,用于实际样品分析,所得结果令人满意。     

大孔阴树脂及其白球对水中低浓度苯酚吸附行为的研究

研究了作为高分子材料的大孔阴树脂及其对应白球对水中低浓度苯酚的吸附行为，详细考察了吸附过程的吸附容量、速度等吸附参数以及ｐＨ、Ｃａ＾２＋、腐殖质等因素对吸附的影响，并对试验结果从理论上进行了分析与探讨。     

柳树乙醇提取物体外抗氧化活性

通过Fenton反应产生.OH,邻苯三酚自氧化产生O2.-模型,研究了柳树乙醇提取物体外清除自由基的作用。结果显示,柳茎和柳叶乙醇提取物在3.125—50 mg/ml浓度范围内具有清除O2.-的作用。随着浓度升高,其清除作用增大。在浓度达到50mg/ml时,柳茎提取物的清除率为75.62%,柳叶提取物的清除率为88.53%;柳茎乙醇提取物在3.125—25 mg/ml浓度范围内,清除.OH的能力随着其浓度的增加而逐渐增强。当浓度为25mg/ml时,其清除率为60.63%;柳叶提取物在浓度3.125—25mg/ml内清除.OH的作用不明显。当浓度达到50mg/ml时,对羟基自由基的清除率为60.63%。     

城市绿地对空气负离子的影响

在南昌市选择有典型特征的城市绿地,对其在不同环境状况下的空气正、负离子浓度进行监测。研究结果表明:(1)城市绿地能有效提高空气负离子数量;(2)乔、灌、草3种不同类型的绿地中,以乔木林对提高空气负离子浓度和改善空气质量的作用最为显著;(3)在城市环境下,不同林分结构类型的乔木片林对空气负离子水平以及空气质量指数(CI)的影响差异不显著;(4)天气条件对绿地的空气负离子水平存在显著影响;(5)喷泉对空气负离子有显著影响。喷泉周围空气负离子浓度节律性振荡周期与喷泉的喷水变化周期相吻合。喷泉对空气负离子浓度以及CI的影响随着距离的增加而迅速减小。     

成都市郊区雾水中阴离子变化的研究

本文用冷凝法采集雾水样品,用离子色谱法测定雾水样品中阴离子(氟离子、氯离子、亚硝酸根离子、硝酸根离子、硫酸根离子)的浓度,研究表明雾水中阴离子浓度与雾的浓密有关,雾水中硫酸根离子含量最高;雾水中阴离子浓度随大雾的消失而降低;雾水中阴离子浓度大于雨水。所得结果对在大雾天气情况下保护人体健康有一定参考意义。     

水中微量甲基膦酸类化合物的树脂富集与GC／MS分析

本文使用三种阴离子交换树脂（即大孔弱碱型Ｄ－３０１－Ｒ，强碱型Ｄ－２９６，２０１Ｘ７）柱对水中微量甲基膦酸类化合物的富集方法进行了研究。含磷毒剂降解产物的水样用气相色谱／质谱法进行定性定量分析。结果表明，Ｄ－３０１－Ｒ阴离子交换树脂柱对甲基膦酸的富集回收率高于６０％。     

吸附-Fenton氧化-絮凝法处理对硝基苯胺生产废水

采用吸附-Fenton氧化-絮凝法处理对硝基苯胺生产废水(简称废水),研究了吸附剂、脱附温度、絮凝剂等因素对处理效果的影响.经实验确定的最佳工艺条件为:DM301大孔树脂加入量5.0 g/L,吸附时间20 h,Fenton氧化pH 3.0,H_20_2加入量0.3 moL/L,m(Fe):m(H_20_2)=6,絮凝阴离子型聚丙烯酰胺加入量20 mg/L.在此条件下对COD为2 780 mg/L、色度为185倍和pH为12.2的废水进行处理,出水的COD、色度和pH分别为169 mg/L、10倍和6.5,COD去除率和色度去除率分别达到93.9%和94.5%.DM301树脂在10～25次重复使用后对硝基苯胺的平均总去除率为47.7%,对硝基苯胺的平均回收率为37.9%.     

Synthesis of mesoporous Cu/Mg/Fe layered double hydroxide and its adsorption performance for arsenate in aqueous solutions

The mesoporous Cu/Mg/Fe layered double hydroxide(Cu/Mg/Fe-LDH) with carbonate intercalation was synthesized and used for the removal of arsenate from aqueous solutions.The Cu/Mg/Fe-LDH was characterized by Fourier transform infrared spectrometry,X-ray diffraction crystallography,scanning electron microscopy,X-ray photoelectron spectroscopy and Brunauer-Emmett-Teller.Effects of various physico-chemical parameters such as pH,adsorbent dosage,contact time and initial arsenate concentration on the adsorption of arsenate onto Cu/Mg/Fe-LDH were investigated.Results showed that it was efficient for the removal of arsenate,and the removal efficiency of arsenate increased with the increment of the adsorbent dosage,while the arsenate adsorption capacity decreased with increase of initial pH from 3 to 11.The adsorption isotherms can be well described by the Langmuir model with R 2 > 0.99.Its adsorption kinetics followed the pseudo second-order kinetic model.Coexisting ions such as HPO42-,CO32-,SO42and NO3could compete with arsenate for adsorption sites on the Cu/Mg/Fe-LDH.The adsorption of arsenate on the adsorbent can be mainly attributed to the ion exchange process.It was found that the synthesized Cu/Mg/Fe-LDH can reduce the arsenate concentration down to a final level of < 10 μg/L under the experimental conditions,and makes it a potential material for the decontamination of arsenate polluted water.