Synthesis of poly(m-phenylenediamine) with improved properties and superior prospect for Cr(VI) removal  

聚间苯二胺的逐滴法高效合成及对Cr(VI)的吸附性能(英文)

作　　者：于婉婷[1] 柴立元[1,2] 张理源[1] 王海鹰[1,2] 

机构地区：[1]中南大学冶金与环境学院,长沙410083 [2]中南大学国家重金属污染防治工程技术研究中心,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第11期3490-3498,共9页中国有色金属学报（英文版）

基　　金：Project(2011467062)supported by National Public Welfare Research Project of Environmental Protection Industry,China;Project(50925417)supported by National Science Fund for Distinguished Young Scholars of China;Project(50830301)supported by the National Natural Science Foundation of China

摘　　要：Chemically oxidative polymerization of m-phenylenediamine was improved through adding the weak alkaline, Na2CO3. Results show that the poly （m-phenylenediamine） （PmPD） possesses a weak solubility in acidic solution according to total organic carbon （TOC） that the TOC is less than 8 mg/L, which is much lower than the discharge standard （20 mg/L）. The TOC of the PmPD synthesized with NaOH can be as high as 120.9 mg/L. This very weak solubility of PmPD synthesized with Na2CO3 facilitates its application in water purification. The oxidation state of PmPD is decreased and the yield is increased with a maximum of 84%, promoting the concentration of Na2CO3 in the synthesis. Moreover, the Cr（VI） performance of PmPD was marvelously enhanced with Na2CO3 to improve the synthesis. The largest Cr（VI） adsorbance can reach as high as 666.8 mg/g, which is far more than the performance of other common adsorbents.提出并研究了Na2CO3逐滴法化学氧化合成聚间苯二胺的新方法。总有机碳(TOC)的测定结果显示,采用NaOH逐滴法合成的聚间苯二胺在酸性溶液中的TOC达到120.9 mg/L,而采用Na2CO3逐滴法合成的聚间苯二胺在酸性溶液中的TOC小于8 mg/L,明显低于前者和污水综合排放标准(20 mg/L),更适合于水处理领域的应用。增加Na2CO3的浓度可使聚间苯二胺的氧化态降低,产率提高到84%,并且对Cr(VI)的脱除性能有明显改善。聚间苯二胺对Cr(VI)的最大吸附量可达666.8 mg/g,远高于目前国内外报道的其他吸附材料。

关 键 词：poly （m-phenylenediamine） chromium （VI） sodium carbonate adsorption 

分 类 号：X703[环境科学与工程—环境工程]