共查询到19条相似文献,搜索用时 93 毫秒
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《四川环境》2021,(4)
采用3-氨丙基三甲氧基硅烷对MCM-41进行氨基功能化修饰,并以此作为吸附剂(NH2-MCM-41)来去除阴离子染料废水酸性品红(AF)。应用平衡吸附法,重点考察了溶液的p H值、吸附剂的投加量、吸附时间以及染料的初始浓度对吸附效果的影响,并采用吸附等温线和动力学模型进行吸附机理分析。实验得出:溶液的p H值对吸附效果影响较大,染料的去除率随着吸附剂质量、反应时间的增加而上升,随染料初始浓度的增加而下降。Langmuir模型对染料的等温吸附行为拟合效果最好,吸附动力学符合准二级动力学模型。解吸附研究得出NH2-MCM-41有较好的解吸附效果和重复使用率。氨基改性后的MCM-41对AF有良好的吸附效果,可以作为一种新型高效的吸附剂进一步用于阴离子染料废水治理。 相似文献
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本文针对染料废水处理中存在的问题,介绍了利用白腐真菌处理废水的一般机理及其优势。在此基础上。对该菌种在处理染料废水研究应用中的筛选与降解机理、主要工艺条件对处理效果的影响和反应器类型等方面的研究成果给予了分析与评述。 相似文献
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染料废水脱色的物理化学处理技术 总被引:2,自引:0,他引:2
染料废水目前主要的脱色方法有吸附、混凝、氧化还原和生化法.活性炭吸附适用于低浓度的染料废水处理.聚硅硫酸铁混凝效果与Fe/SiO4摩尔比和pH值相关.氢氧化镁可有效去除印染废水中的直接红染料.有机絮凝剂往往需要和其它药剂复配.氧化法脱色率大,但成本高昂,且受染料废水的组成、氧化性及pH值影响.还原法药剂价格低廉,但还原降解产物具有毒性,必须经过二次处理.生物法成本较低,又受制于染料的生物降解性.因此发展多种手段联合应用已是当前染料废水处理的研究方向. 相似文献
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A review and experimental verification of using chitosan and its derivatives as adsorbents for selected heavy metals 总被引:1,自引:0,他引:1
A literature survey on liquid-phase adsorption of selected heavy metals including Cu(II), Zn(II), Ni(II), Cd(II), Pb(II), Hg(II), and Cr(VI) on chitosan (CTS) and its derivatives was made from the viewpoint of adsorption capacity. This parameter was obtained from the Langmuir fit of isotherm data. The magnitude of adsorption capacity of heavy metals on pristine CTS was also used to discuss the mechanism of adsorption; that is, how many amino groups in CTS chains would coordinate with one heavy metal ion. Furthermore, a newly defined parameter, the approaching equilibrium factor RL, was proposed to quantitatively indicate the favorability of the related adsorption process and to judge the correctness of adsorption capacity determined by the Langmuir equation. 相似文献
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Asha Srinivasan Thiruvenkatachari Viraraghavan 《Journal of environmental management》2010,91(10):1915-1929
Dye wastewater is one of the most difficult to treat. There has been exhaustive research on biosorption of dye wastewater. It is evolving as an attractive option to supplement conventional treatment processes. This paper examines various biosorbents such as fungi, bacteria, algae, chitosan and peat, which are capable of decolorizing dye wastewaters; discusses various mechanism involved, the effects of various factors influencing dye wastewater decolorization and reviews pretreatment methods for increasing the biosorption capacity of the adsorbents. The paper examines the mismatch between strong scientific progress in the field of biosorption and lack of commercialization of research. 相似文献
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Jesus Barron-Zambrano Agata Szygula Montserrat Ruiz Ana Maria Sastre Eric Guibal 《Journal of environmental management》2010,91(12):2669-2675
Fixed-bed column studies were carried out to investigate the dynamic sorption of Reactive Black 5 (RB5) onto chitosan. The effect of operating parameters such as initial dye concentration, superficial flow velocity, bed height and particle size on the sorption of RB5 onto chitosan was studied. Column regeneration, dye recovery and the possibility of reusing the regenerated chitosan were also investigated. The results show that both the breakthrough curves and the adsorption parameters of the column were strongly affected by the operating parameters studied. An analysis of the breakthrough curves indicated that adsorption was affected by mass transfer limitations, probably due to intraparticle diffusion. An empirical model was applied to describe the breakthrough curves, while the Bohart–Adams and BDST models were used to determine the operating parameters useful in the process design. Elution of the column with 0.01 mol L?1 NaOH allowed the chitosan to be regenerated and the dye to be recovered and concentrated. The concentration factor was 10. Several cycles of adsorption–elution showed that the regenerated chitosan retained good adsorption efficiency and the elution efficiency was always higher than 80%. 相似文献
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The macroalga Caulerpa lentillifera was found to have adsorption capacity for a basic dye, Astrazon Blue FGRL. For the whole range of concentrations employed in this work (20-1280 mgl(-1)), the adsorption reached equilibrium within the first hour. The kinetic data corresponded well with the pseudo second-order kinetic model where the rate constants decreased as initial dye concentrations increased. At low dye concentrations (20-80 mgl(-1)), an increase in the adsorbent dosage resulted in a higher removal percentage of the dye, but a lower amount of dye adsorbed per unit mass (q). The adsorption isotherm followed both the Langmuir and Freundlich models within the temperature range employed in this work (18-70 degrees C). The highest maximum adsorption capacity (q(m)) was obtained at 50 degrees C. The enthalpy of adsorption was estimated at 14.87 kJmol(-1) suggesting a chemical adsorption mechanism. 相似文献
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水淬渣的微观结构特殊,比表面积大,表面能高。国内外研究表明,水淬渣吸附去除废水中的Cu2+、Zn2+、Ni2+、Pb2+、Cr6+、As3+及磷等效果良好,而且对废水中的COD、大分子有机物、油类、苯酚等也有比较好的去除率;并研究了吸附去除的机理,对水淬渣在水处理领域的应用起到了推动作用。 相似文献
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当前,土壤重金属污染问题已成为了备受国内外关注的环境问题之一。相比于传统单一生物炭,生物炭复合材料具有循环利用性能更佳、吸附能力更强、修复选择性更广等优点,是一种稳定的、应用前景广的土壤重金属污染修复材料。系统性地综述了目前国内外生物炭改性优化方法以及吸附重金属相关机理,讨论了生物炭应用于土壤污染修复领域存在的潜在环境风险,进一步阐述总结了目前生物炭复合材料在土壤重金属污染修复方面的应用研究及其作用机制,以期为生物炭复合材料修复土壤重金属污染的可行性提供理论依据与支持。 相似文献
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The prepared different components municipal solid wastes based carbons were used to investigate the adsorption of CO2. The optimum conditions for CO2 adsorption were investigated firstly. And then, the CO2 adsorption performance of different components based carbon adsorbents were compared with each other under the optimum parameters. The results illustrated that the triple components (pinewood, acrylic textile, and tire) based carbon exhibited the best adsorption performance, which is 1.522 mmol/g and its physical prosperity was also conducted to interpret the adsorption mechanism. Besides, to further approach to the actual gas, the influence of additional O2 and SO2 on CO2 adsorption properties of ternary-component-based carbon was investigated. The results illustrate that O2 concentration exerts little effect on adsorption capacity. SO2 plays the dominated role in the competitive adsorption effect. 相似文献