Photooxidation of APAP in water induced by the photolysis of Fe(III)–oxalate complexes is investigated.Initial concentration,pH value and Fe/oxa ratio could affect the photodegradation efficiency.The photodegradation...Photooxidation of APAP in water induced by the photolysis of Fe(III)–oxalate complexes is investigated.Initial concentration,pH value and Fe/oxa ratio could affect the photodegradation efficiency.The photodegradation efficiency of APAP increased with decreasing the initial concentration in the range of 25.0–100.0μmol·L-1 under the condition of pH 4.0,20.0 μmol·L-1 Fe(III),300.0μmol·L-1 oxalate.For pH value and Fe/oxa ratio,in fact,these two aspects are integrated into one point that they both had an important effect on the competition between formation of Fe(III)–oxalate complexes and Fe(III)–OH complexes,which have an important effect on the formation of H2O2 and ·OH radicals.展开更多
考察不同因素对异化铁还原菌(Dissimilatory Iron Reducing Bacteria,DIRB)还原高岭土中Fe(Ⅲ)的影响,通过在底液中添加不同有机酸、草酸盐、络合剂和重金属离子来研究微生物还原铁的机制。结果发现,添加草酸对微生物还原铁有明显的促...考察不同因素对异化铁还原菌(Dissimilatory Iron Reducing Bacteria,DIRB)还原高岭土中Fe(Ⅲ)的影响,通过在底液中添加不同有机酸、草酸盐、络合剂和重金属离子来研究微生物还原铁的机制。结果发现,添加草酸对微生物还原铁有明显的促进作用,而乙酸和水杨酸则抑制了微生物的生长;添加草酸钠的实验表明草酸对微生物的促进作用是通过草酸根离子的作用而与草酸的酸性并无联系;络合剂(NTA)可以提高微生物异化铁还原量,而EDTA不影响铁还原的作用;Cu(Ⅱ)对微生物具有毒害作用从而抑制了微生物的还原活性,Mn(Ⅱ)对铁的还原则有明显的促进作用。此外,采用logistic方程对有促进作用的曲线进行拟合,发现添加草酸钠对微生物的还原铁促进作用最大。展开更多
文摘Photooxidation of APAP in water induced by the photolysis of Fe(III)–oxalate complexes is investigated.Initial concentration,pH value and Fe/oxa ratio could affect the photodegradation efficiency.The photodegradation efficiency of APAP increased with decreasing the initial concentration in the range of 25.0–100.0μmol·L-1 under the condition of pH 4.0,20.0 μmol·L-1 Fe(III),300.0μmol·L-1 oxalate.For pH value and Fe/oxa ratio,in fact,these two aspects are integrated into one point that they both had an important effect on the competition between formation of Fe(III)–oxalate complexes and Fe(III)–OH complexes,which have an important effect on the formation of H2O2 and ·OH radicals.
文摘考察不同因素对异化铁还原菌(Dissimilatory Iron Reducing Bacteria,DIRB)还原高岭土中Fe(Ⅲ)的影响,通过在底液中添加不同有机酸、草酸盐、络合剂和重金属离子来研究微生物还原铁的机制。结果发现,添加草酸对微生物还原铁有明显的促进作用,而乙酸和水杨酸则抑制了微生物的生长;添加草酸钠的实验表明草酸对微生物的促进作用是通过草酸根离子的作用而与草酸的酸性并无联系;络合剂(NTA)可以提高微生物异化铁还原量,而EDTA不影响铁还原的作用;Cu(Ⅱ)对微生物具有毒害作用从而抑制了微生物的还原活性,Mn(Ⅱ)对铁的还原则有明显的促进作用。此外,采用logistic方程对有促进作用的曲线进行拟合,发现添加草酸钠对微生物的还原铁促进作用最大。
