利用差分光谱法研究硬度离子Ca~(2+)/Mg~(2+)对混凝剂铁盐与溶解性有机物络合的影响

详细信息    查看全文 | 推荐本文 |

英文篇名：Effect of hardness cations on the complexation between coagulant ferric ion and dissolved organic matter by differential UV-visible absorbance spectroscopy 作者：谢亚萍 ; 程继夏 ; 晏明全 英文作者：XIE Yaping;CHENG Jixia;YAN Mingquan;College of Environmental Sciences and Engineering, Chang′an University;Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environmental Science and Engineering,Peking University; 关键词：紫外-可见光谱滴定 ; 硬度离子 ; 铁盐 ; 络合 ; 溶解性有机物(DOM) 英文关键词：UV-visible absorbance spectroscopy titration;;hardness cations;;ferric ion;;complexation;;dissolved organic matter(DOM) 中文刊名：HJJZ 英文刊名：Chinese Journal of Environmental Engineering 机构：长安大学环境科学与工程学院;北京大学环境科学与工程学院教育部水沙科学重点实验室; 出版日期：2019-03-25 15:12 出版单位：环境工程学报 年：2019 期：v.13 基金：国家自然科学基金资助项目(51578007) 语种：中文; 页：HJJZ201905007 页数：7 CN：05 ISSN：11-5591/X 分类号：54-60

摘要

硬度离子Ca~(2+)/Mg~(2+)在水体中广泛存在,而其对水处理混凝工艺去除溶解性有机物(DOM)的影响并不是很清楚,这主要是由于缺乏可用于表征混凝环境条件下DOM、混凝剂、硬度离子之间相互作用过程的方法。采用差分光谱法,定量表征在pH为7时Ca~(2+)或Mg~(2+)对混凝剂Fe~(3+)与DOM络合过程的影响。结果表明,Ca~(2+)或Mg~(2+)的存在会显著影响Fe~(3+)与DOM的络合过程,随着Ca~(2+)或Mg~(2+)的浓度增大,对Fe~(3+)与DOM络合产生的抑制越显著,尤其是Mg~(2+)。研究为深入认识混凝去除DOM的机理提供了新方法与新视角。
        Hardness cations(Ca~(2+)and Mg~(2+)) are widely present in water, while their effects on the removal of dissolved organic matter(DOM) by coagulation in water treatment are unclear yet. This is partly due to the lack of methods to characterize the interaction among DOM, coagulants, and hardness cations under the conditions of coagulation. In this study, the differential UV-visible absorbance spectroscopy method was used to quantitively characterize the effect of hardness cations on the complexation between ferric ion and DOM at pH 7. It demonstrates that the presence of hardness cations could significantly affect the complexation between Fe~(3+)and DOM, and the inhibition against their complexation was aggravated with the increase of the concentrations of Ca~(2+)or Mg~(2+), especially for the latter cation. The results provide a new method to reveal the mechanism of coagulation, as well as the effect of hardness cations on it.

引文

[1]李悦宁,贺凯,王婷等.日本消毒副产物及其前体物的现状及研究进展[J].环境化学, 2018, 37(8):1820-1830.
    [2]赵玉丽,李杏放.饮用水消毒副产物:化学特征与毒性[J].环境化学, 2011, 30(1):20-33.
    [3] GAO B Y, WANG Y, YUE Q Y, et al. The size and coagulation behavior of a novel composite inorganic-organic coagulant[J].Separation&Purification Technology, 2008, 62(3):544-550.
    [4]杨雪.新生态三价铁混凝处理松花江水的效果与机理研究[D].哈尔滨:哈尔滨工业大学, 2011.
    [5]张华,崔柳华,吴百春.国内外除硬技术现状研究[J].工业水处理, 2011, 31(12):5-8.
    [6] AHN W Y, KALINICHEV A G, CLARK M M. Supramolecular aggregation of natural organic matter promoted by complexation with Ca2+, Mg2+, and Na+ions in aqueous solutions[J]. Geochimica Cosmochimica Acta, 2008, 72(12):A10.
    [7] LU Y F, ALLEN H E. Characterization of copper complexation with naturaldissolved organic matter(DOM)-link to acidic moieties of DOM and competition by Ca and Mg[J]. Water Research, 2002, 36(20):5083-5101.
    [8] STUMM W, MORGAN J J. Aquatic chemistry:An introduction emphasizing chemical equilibria in natural waters[J]. Ecological Modelling, 1981, 19(3):227-230.
    [9] USEPA. Enhanced coagulation and enhanced precipitative softening guidance manual[S]. Washington D C:EPA, Office of Water and Drinking Ground Water, 1998.
    [10] MOTA A, RATO C, BRAZIA C, et al. Competition of Al3+in complexation of humic matter with Pb2+:A comparative study with other ions[J]. Environmental Science&Technology, 1996, 30(6):1970-1974.
    [11] NORDEN M, EPHRAIM J H, ALLARD B. Europium complexation by an aquatic fulvic acid:Effects of competing ions[J].Talanta, 1997, 44(5):781-786.
    [12] TOWN R M, POWELL H K J. Ion-selective electrode potentiometric studies on the complexation of copper(II)by solid-derived humic and fulvic acids[J]. Analytica Chimica Acta, 1993, 279(2):221-233.
    [13] GAO Y, YAN M Q, KORSHIN G. Effects of calcium on the chromophores of dissolved organic matter and their interactions with copper[J]. Water Research, 2015, 81:47-53.
    [14] YAN M Q, KORSHIN G. Comparative examination of effects of binding of different metals on chromophores of dissolved organic matter[J]. Environmental Science&Technology, 2014, 48(6):3177-3185.
    [15] MAURICE P A. Special issue introduction:Dissolved organic matter from the suwannee river(GA, USA)[J]. Environmental Engineering Science, 2015, 32(1):1-3.
    [16] ZHOU Y X, YAN M Q, LIU R P, et al. Investigating the effect of hardness cations on coagulation:The aspect of neutralisation through Al(III)-dissolved organic matter(DOM)binding[J]. Water Research, 2017, 115:22-28.
    [17] YAN M Q, MA J, JI G D. Examination of effects of Cu(II)and Cr(III)on Al(III)binding by dissolved organic matter using absorbance spectroscopy[J]. Water Research, 2016, 9:84-90.
    [18] YAN M Q, DRYER D, KORSHIN G, et al. In situ study of binding of copper by fulvic acid:Comparison of differential absorbance data and model predictions[J]. Water Research, 2013, 47(2):588-596.
    [19] YAN M Q, LI D C, GAO J F, et al. Influence of chlorination on metal binding by dissolved organic matter:A study using logtransformed differential spectra[J]. Chemosphere, 2014, 103:290-298.
    [20] YAN M Q, LU Y J, GAO Y, et al. In-situ investigation of interactions between magnesium ion and natural organic matter[J].Environmental Science&Technology, 2015, 49(14):8323-8329.