改性氧化铝微波诱导氧化处理雅格素蓝BF-BR染料废水的研究

采用微波诱导氧化工艺(MIOP)技术,以改性氧化铝为催化剂,对雅格素蓝BF-BR染料模拟废水进行氧化处理．优化了处理工艺条件,实验在固液质量比为1：10(50mL雅格素蓝BF-BR水溶液中投加5．0g改性氧化铝)、微波功率为400W的条件下微波辐照处理5min．在此工艺条件下,对水中雅格素蓝BF-BR的脱色率可达到98％,COD去除率为87．4％．改性氧化铝在重复使用9次后仍能保持很高的脱色率．进一步研究表明在微波辐射场中废水中的有机污染物在改性氧化铝表面通过吸附．氧化协同作用而被迅速降解．反应动力学研究表明,该氧化过程符合一级反应动力学规律,反应速率常数k=0995min^-1,反应半衰期t1/2=0．697min．实验结果显示,在本实验中改性氧化铝比颗粒活性炭具有更高的催化活性．     

微波诱导氧化法处理染料废水工艺技术研究

文章以雅格素蓝BF-BR染料为处理对象,研究在负载亚铁改性活性炭存在条件下利用微波诱导氧化工艺(MIOP)处理染料雅格素蓝BF-BR模拟废水的可行性,考查并优化了处理工艺条件,研究探讨了MIOP反应机理及雅格素蓝BF-BR的脱色反应动力学.     

活性艳蓝X-BR的电化学行为及机理研究

采用循环伏安法、线性扫描伏安法及微分脉冲伏安法研究了活性艳蓝X BR在0 1mol·l- 1 KCl HCl溶液中的电化学行为 .研究发现 ,在 - 0 45V— 1 0VvsSCE电压范围内的循环过程中出现两对氧化还原电流峰 ,通过考察峰电压随溶液pH值的变化 ,提出了可能的电极反应机理 :阳极区的电极反应是属于失 1质子和 2电子的氧化反应 ,而阴极区的电极反应则是蒽醌基团被还原加氢成为氢醌基团的反应     

还原棕BR染料废水预处理工艺的研究

利用“中和絮凝－电化学还原－混凝－空气吹脱”法对还原棕BR清洁工艺生产废水进行预处理，废水中的重金属污染物得到有效去除，其COD、NH4^ -N、氟化物以度的去除率可分别达到94％、93％、99％及95％，同时提高了废水的可生化性，减轻了后续生化系统的有机负荷和对生物的毒性。重点论述了工艺的作用机理以及最佳操作参数的确定。     

Brassinosteroid alleviates phenanthrene and pyrene phytotoxicity by increasing detoxification activity and photosynthesis in tomato

The present study was carried out to investigate the effects of exogenously applied 24-epibrassinolide (BR) on growth, gas exchange, chlorophyll fluorescence characteristics, lipid peroxidation and antioxidant systems of tomato seedlings grown under different levels (0, 10, 30, 100 and 300 μM) of phenanthrene (PHE) and pyrene (PYR) in hydroponics. A concentration-dependent decrease in growth, photosynthetic pigment contents, net photosynthetic rate (Pn), stomatal conductance (Gs), maximal quantum yield of PSII (Fv/Fm), effective quantum yield of PSII (Φ_PSII), photochemical quenching coefficient (qP) has been observed following PHE and PYR exposure. By contrast, non-photochemical quenching coefficient (NPQ) was increased. PHE was found to induce higher stress than PYR. However, foliar or root application of BR (50 nM and 5 nM, respectively) alleviated all those depressions with a sharp improvement in the activity of photosynthetic machinery. The activities of guaicol peroxidase (GPOD), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) as well as content of malondialdehyde (MDA) were increased in a dose-dependent manner under PHE or PYR treatments. Compared with control the highest increments of GPOD, CAT, APX, GR and MDA by PHE/PYR alone treatments were observed following 300 μM concentration, which were 67%, 87%, 53%, 95% and 74% by PHE and 42%, 53%, 30%, 86% and 62% by PYR, respectively. In addition, both reduced glutathione (GSH) and oxidized glutathione (GSSG) were induced by PHE or PYR. Interestingly, BR application in either form further increased enzymatic and non enzymatic antioxidants in tomato roots treated with PHE or PYR. Our results suggest that BR has an anti-stress effect on tomato seedlings contaminated with PHE or PYR and this effect is mainly attributed by increased detoxification activity.