共查询到19条相似文献,搜索用时 93 毫秒
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采用实验室自制磷酸铁,从溶液的p H值、砷初始浓度、温度、搅拌速度等方面探讨磷酸铁对砷的吸附作用。得到磷酸铁吸附砷的最佳工艺条件为:砷初始浓度为0.000 1 mol/L、p H=7、搅拌速度为600 r/min、反应体系温度为80℃和反应时间为1 h,该条件下磷酸铁对砷的吸附效率达到99.6%。为解决饮用水或土壤中砷污染的问题提供一定的参考意义。 相似文献
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以炼钢厂固体废弃物钢渣为材料,通过批量平衡吸附法,并结合宏观热力学和动力模型应用,分析和研究了钢渣对水溶As(III)的吸附特征。结果表明钢渣在吸附As(III)过程中,初始阶段吸附量迅速增加,随着浓度的增加,吸附逐渐趋于饱和,最后达到平衡,具有"快速吸附、缓慢平衡"的特点。钢渣吸附材料具有极高的最大吸附容量,高达3.58×104mg/kg。钢渣对As(III)的吸附均符合Langmuir和Freundlich吸附等温线,其中钢渣对As(III)的吸附特征与Freundlich等温吸附方程吻合性最好,相关系数(R2)达到0.99以上。钢渣对As(III)的吸附动力学数据均符合一级动力学方程、Elovich方程和双常数方程,拟合优度用相关系数(R2)为0.92~0.98,相比较而言,钢渣对As(III)的吸附以Elovich方程为最佳模型。 相似文献
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氢氧化铁胶体对砷吸附行为的初步研究 总被引:5,自引:0,他引:5
研究了pH值、铁与砷的量比和初始砷浓度等因素对用氢氧化铁胶体吸附去除砷的影响,确定了最佳吸附条件。研究结果表明,在初始As(Ⅴ)或As(Ⅲ)浓度为0.1mmol/L条件下,去除As(Ⅴ)的最佳pH值为4~8,去除As(Ⅲ)最佳pH值为6~9;在初始As(Ⅴ)浓度为0.5mmol/L条件下,去除As(Ⅴ)的最佳pH值为5~7,吸附后溶液中砷含量低于0.5mg/L,达到了《污水综合排放标准(GB8978-1996)》中工业废水最高容许排放总砷浓度一级标准。通过等温吸附试验的研究,得出了As(Ⅴ)和As(Ⅲ)的饱和吸附容量分别为0.4971mol/kg和0.3068mol/kg。 相似文献
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采用骨炭作吸附剂,通过静态和动态吸附试验,研究了其对饮用水中砷的脱除效果及其影响因素,以及骨炭反复吸附一解吸一再生一再吸附后性能的稳定性.结果表明,骨炭能够高效除砷.骨炭吸附砷符合Langmuir和Freundlich等温吸附模型.吸附柱的饱和吸附容量为4.688 mg/g,饮用水出水砷浓度符合世界卫生组织(WHO)规定的饮用水标准(As<0.01 mg/L),说明骨炭除砷具有很好的应用前景. 相似文献
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三氯化铁除砷的工艺研究 总被引:1,自引:0,他引:1
为了减少铁盐除砷过程中产生的危险废渣的数量,研究了三氯化铁作为除砷剂处理砷(Ⅲ)和砷(Ⅴ)废水的工艺条件,主要包括pH值、铁砷摩尔比(nFe/As)、反应时间等.结果表明,用三氯化铁处理含砷(Ⅲ)1647.8 mg·L-1废水的最佳工艺条件为:pH=9、反应时间1h、nFe/As=2;处理含砷(Ⅴ) 3697.2 mg· L-1废水的最佳工艺条件为:pH=8、反应时间1h、nFe/As=2.此外,阳离子型絮凝剂PAM209cc适合于铁砷沉淀物的沉降,对砷(Ⅲ)废水和砷(Ⅴ)废水的最佳投加量分别为40 mL· L-1、20 mL· L-1. 相似文献
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《分离科学与技术》2012,47(15):2380-2390
A laboratory study was conducted to investigate the ability of ferric ion loaded red mud (FRM) for the removal of arsenic species from water. The adsorbent material was characterized by scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. For an initial arsenic concentration lower than 0.3 mg/L, the FRM with a dosage of 1 g/L was able to reduce As(III) at pH 7 below 10 µg/L, the maximum contaminant level (MCL) of arsenic in drinking water set by the World Health Organization. In the case of As(V) removal, FRM was also particularly effective in reducing the initial arsenic concentration value of 1 mg/L at pH 2, below the MCL requirement of arsenic for drinking water. According to kinetic sorption data, the initial stage of adsorptions of As(III) and As(V) onto FRM were mainly governed by the external diffusion mechanism; however, upon saturation of the external adsorbent surface, the arsenic species were eventually adsorbed by intraparticle diffusion mechanism. The present results are promising for using the very inexpensive FRM as a low-cost material that is effective in remediating drinking waters contaminated with low concentrations of arsenic species. We report here the sorption kinetics and adsorption mechanisms of As(III) and As(V) on the FRM that has not been decsribed previously. 相似文献
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对聚硅酸氯化铝铁混凝处理含砷废水进行了研究。考察了混凝剂用量,(Fe Al)/SiO2物质的量比,碱化度对除砷率的影响。实验结果表明(Fe Al)/SiO2=5∶1,B=0.1时,在pH值7.0,投加量为120 mg/L的条件下,聚硅酸氯化铝铁除砷率达90.5%。实际水样处理后的水质能够达到废水中砷的排放标准。并且通过红外光谱分析讨论了混凝除砷机理。 相似文献
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Thayyath Sreenivasan Anirudhan Lekshmi Divya Jayasree Parvathy 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2013,88(5):878-886
BACKGROUND: The main aim of this study is to determine the sorptive potential of a novel anion exchanger, Fe(III)‐coordinated amino‐functionalized poly(glycidylmethacrylate)‐grafted TiO2‐densified cellulose (AM‐Fe‐PGDC) for arsenic(V) removal from aqueous solutions by batch technique. RESULTS: The adsorbent was characterized using infrared spectroscopy, powder X‐ray diffraction, scanning electron microscopy, thermogravimetry and potentiometric titrations. The effective pH for removal was 6.0. The adsorption rate was influenced by initial metal ion concentration and contact time. The equilibrium was achieved within 1.5 h and follows a pseudo‐second‐order kinetic model. The adsorption capacity for As(V) calculated using the Langmuir isotherm equation was 105.47 mg g?1. The AM‐Fe‐PGDC developed was used to remove As(V) from simulated groundwater. Regeneration experiments were attempted for four cycles using 0.1 mol L?1 NaCl solution. CONCLUSION: It was found that AM‐Fe‐PGDC is very efficient for the removal of As(V) from aqueous solutions. © 2012 Society of Chemical Industry 相似文献
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分析归纳了各种含砷饮用水处理技术,重点阐述了混凝沉淀法在处理饮用水中砷的研究进展,对吸附法、离子交换法等五种其他饮用水除砷技术进行了分析,并比较了各种除砷技术的优缺点,指出其适用条件。 相似文献
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含铁、锰高的水带有黄色和异味,工业用水则会在产品上形成黄斑,影响质量,必须严格控制铁、锰在水中的含量。砷是人体非必须元素,单质砷的毒性较低而砷的化合物均有剧毒,减少人体对砷的摄入量非常重要。文章对地下水联合除铁、除锰、除砷及其原理进行探讨。 相似文献
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研究了锰改性沸石(MOCZ)对水中砷的吸附效果、影响因素及其吸附除砷的机理。结果表明,当原水中的砷浓度为100μg·L-1时,在MOCZ与砷的质量比为100:1、温度为25℃、接触时间为240min、水样pH值为6~7的条件下,MOCZ对砷的去除率达到900.4以上,吸附后水样中砷浓度为9.50μg·L-1,低于《生活饮用水卫生标准》的要求(≤10μg·L-1)。Langmuir吸附等温模型能较好地描述MOCZ对水中砷的吸附行为,拟合曲线的相关系数R2=0.9856,初步推测为单层吸附。 相似文献