Pizzigallo Maria D R, Napola Annalisa, Spagnuolo Matteo, Ruggiero Pacifico
Dipartimento di Biologia e Chimica Agroforestale e Ambientale, via Amendola 165/a, 70125 Bari, Italy.
Chemosphere. 2004 Jun;55(11):1485-92. doi: 10.1016/j.chemosphere.2004.01.001.
The purpose of this work is to evaluate the catalytic efficiency of two metal oxides, ferrihydrite and birnessite and of a ferruginous smectite, towards organic molecules such as 4-chloroaniline (4-CA), pentachlorophenol (PCP), and five polychlorinated biphenyls (PCBs) characterised by different number and position of chlorine atoms. Mechanochemical dry contacts with light grinding between catalytic surfaces and pollutants have been carried out. The efficiency of the mechanochemical removal was compared with batch experiments for the soluble compounds (PCP and 4-CA). The removal of 4-CA and PCP by the mechanochemical procedure resulted more effective than by batch contact in the presence of birnessite and ferrihydrite, particularly at higher pH (100% removal of 4-CA by birnessite in 30 min at pH 8.6 after the mechanochemical contact compared to 20% removal using the batch interaction at the same pH). The mechanochemical contact of PCBs and birnessite produced a removal of pollutant that was a function of the number of chlorine atoms (complete removal of 2,2'-dichlorobiphenyl in 10 days and a removal of 30% and 20% of 2',3,4-trichlorobiphenyl and 3,3',4,4'-tetrachlorobiphenyl, respectively in 90 days) and of the position of chlorine atoms about the biphenyl rings (100% of 2,2'-dichlorobiphenyl in 10 days, 84% of 3,3'-dichlorobiphenyl in 15 days and 40% of 4,4'-dichlorobiphenyl in 27 days).
本研究旨在评估两种金属氧化物（水铁矿和水钠锰矿）以及一种铁质蒙脱石对有机分子（如4-氯苯胺（4-CA）、五氯苯酚（PCP）和五种多氯联苯（PCBs））的催化效率，这些有机分子的氯原子数量和位置各不相同。进行了催化表面与污染物之间的机械化学干接触和轻度研磨。将机械化学去除效率与可溶性化合物（PCP和4-CA）的批次实验进行了比较。在水钠锰矿和水铁矿存在的情况下，通过机械化学方法去除4-CA和PCP比批次接触更有效，特别是在较高pH值下（在pH 8.6下进行机械化学接触后，水钠锰矿在30分钟内可100%去除4-CA，而在相同pH值下使用批次相互作用时去除率为20%）。多氯联苯与水钠锰矿的机械化学接触产生的污染物去除率是氯原子数量（2,2'-二氯联苯在10天内完全去除，2',3,4-三氯联苯和3,3',4,4'-四氯联苯在90天内分别去除30%和20%）以及氯原子在联苯环上位置的函数（2,2'-二氯联苯在10天内去除100%，3,3'-二氯联苯在15天内去除84%，4,4'-二氯联苯在27天内去除40%）。
