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491.
土壤脲酶和脱氢酶对活性X-3B红污染暴露的耐受性及机理研究 总被引:4,自引:1,他引:4
采用微宇宙实验方法,研究了棕壤、褐土、红壤等3种我国典型土壤中脲酶和脱氢酶对染料活性X-3B红污染的耐受性及其机理.实验结果表明,3种土壤中的脲酶和脱氢酶活性在试验较低浓度的活性X-3B红污染的环境中均被促进,但被促进的程度有所差异,具体表现为棕壤脲酶活性被促进的效果最为明显,其次红壤,褐土最弱;较低浓度的活性X-3B红污染对褐土脱氢酶活性的促进作用最强,其次红壤,棕壤最弱.3种土壤的脲酶和脱氢酶活性被促进的效果随着时间的推移逐渐减弱.3种土壤的脲酶和脱氢酶活性对高浓度的活性X-3B红污染并没有显示受抑制的趋势.相反,二者基本维持在未受染料活性X-3B红污染的对照土壤的活性水平.因此可以初步认为,土壤脲酶和脱氢酶对染料活性X-3B红的污染暴露毒性有耐受作用.基于实验结果,还就2种酶对活性X-3B红污染暴露的耐受机理进行了分析与探讨. 相似文献
492.
The effect of Cl^- on photocatalytic degradation(PCD) of pollutants is an important factor since it is ubiquitous in nature. In general, Cl^- showed an inhibition on photodegradation due to its scavenging HO- radicals. In this paper, experiments were carried out to examine the effects of CI on the PCD of Methylene Blue (MB) and Orange II (OII) in aqueous TiO2 suspensions under UV light illumination. It was found that low concentration of Cl^- ( 〈 0.01 mol/L) showed little influence on both dyes, however, high concentration of Cl^- ( 〉 0.10 mol/L) had a very different influence on the decolorization of dyes: a significant inhibition for MB but a great promotion for Oll. In the presence of 0.50 mol/L Cl^- , the rate decreased by 70% for MB while increased 7.5-fold for Oll. Furthermore, two bands in the ultraviolet region of Oll were rapidly broken down. The proposed mechanism was discussed in detail. 相似文献
493.
羟基铝蒙脱石去除染料弱酸性深蓝GR的研究 总被引:6,自引:1,他引:6
在[OH-]/[A13+]=2.4的反应条件下,利用A13+与碱液反应制备出Keggin离子,并由此制备出羟基铝蒙脱石.XRD-衍射数据表明:羟基铝蒙脱石的层间距由原来的12.58A(d001)增加到18.63A.研究了染料弱酸性深蓝GR在7种改性蒙脱石上的吸附.结果表明:酸性条件下,羟基铝蒙脱石处理有机污染物的去除率高,用0.0200g处理25ml弱酸性深蓝GR溶液,去除率可高达95%以上.由等温吸附线可知:弱酸性深蓝GR在不同改性蒙脱石上的吸附机理主要为表面吸附、离子交换和分配作用. 相似文献
494.
Cadmium transport mediated by soil colloid and dissolved organic matter: A field study 总被引:8,自引:0,他引:8
This study investigated the potential role of soil colloids and dissolved organic matter (DOM) in transporting Cd through in situ
undisturbed paddy soil monoliths. Brilliant Blue was used as a tracer to assess the e ect of preferential flow on Cd down migration.
Experimental results showed that deep penetration of Cd and Brilliant Blue into the soil profile took place due to the preferential flow
through macropores, mainly earthworm channels, with much of chemicals thus bypassing the soil matrix. Dye tracer and Cd distribution
within the soil matrix was fairly restricted to several centimeters. Colloid restrained the migration of both dye and Cd in the matrix and
preferential flow area. DOM facilitated the transport of Cd and Brilliant Blue in matrix and macropores by about 10 cm over that of the
control. Pearson’s is correlation analysis revealed strong associations between Brilliant Blue concentrations, exchangeable Cd and total
Cd concentrations in three studied plots indicating that they had taken the same preferential flow pathway. 相似文献
495.
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497.
Wei Tze Mook Mohammed A. Ajeel Mohamed Kheireddine Arou Ma?gorzata Szlachta 《环境科学学报(英文版)》2017,29(4):184-195
In this work a novel anode configuration consisting of an iron mesh double layer is proposed for the electrochemical treatment of wastewater. The removal of Reactive Black 5 dye(RB5) from synthetic contaminated water was used as a model system. At a constant anode surface area, identical process operating parameters and batch process mode, the iron mesh double layer electrode showed better performance compared to the conventional single layer iron mesh. The double layer electrode was characterized by RB5 and chemical oxygen demand(COD) removal efficiency of 98.2% and 97.7%, respectively, kinetic rate constant of 0.0385/min, diffusion coefficient of 4.9 × 10~(-5)cm~2/sec and electrical energy consumption of 20.53 kWh/kgdye removed. In the continuous flow system, the optimum conditions suggested by Response Surface Methodology(RSM) are: initial solution p H of 6.29,current density of 1.6 m A/cm~2, electrolyte dose of 0.15 g/L and flow rate of 11.47 m L/min which resulted in an RB5 removal efficiency of 81.62%. 相似文献
498.
Photocatalytic degradation of Acid Blue 62 over CuO-SnO2 nanocomposite
photocatalyst under simulated sunlight 总被引:2,自引:0,他引:2
The novel CuO-SnO2 nanocomposite oxide photocatalysts were prepared by simple co-precipitation method, and characterized by X- ray diffraction, transmission electron microscopy, N2 adsorption-desorption measurement and UV-Vis diffuse reflectance spectroscopy. The photocatalytic activities of CuO-SnO2, evaluated using the photodegradation of Acid Blue 62 as a probe reaction under the irradiation of Xenon light, were also found to be related to the calcination temperature and the molar ratio of Cu to Sn. The maximum photocatalytic activity of the CuO-SnO2 photocatalyst was observed to be calcined at 500~C for 3 h (the molar ratio of Cu to Sn was 1:1) due to the sample with good crystallization and high surface area. It also showed much higher photocatalytic activity in treatment dye wastewater under simulated sunlight irradiation compared to Degussa P25 TiO2. 相似文献
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500.
We investigated the decolorization of Orange II with and without the addition of co-substrates and nutrients under an anaerobic sequencing batch reactor (ASBR). The increase in COD concentrations from 900 to 1750 to 3730 mg/L in the system treating 100 mg/L of Orange II-containing wastewater enhanced color removal from 27% to 81% to 89%, respectively. In the absence of co-substrates and nutrients, more than 95% of decolorization was achieved by the acclimatized anaerobic microbes in the bioreactor treating 600 mg/L of Orange II. The decrease in mixed liquor suspended solids concentration by endogenous lysis of biomass preserved a high reducing environment in the ASBR, which was important for the reduction of the Orange II azo bond that caused decolorization. The maximum decolorization rate in the ASBR was approximately 0.17 g/hr in the absence of co-substrates and nutrients. 相似文献