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The degradation of nonylphenol (NP) in aqueous solution with UV, H2O2/UV, and Fenton/photo-Fenton processes was studied. The efficacy of direct and hydrogen peroxide photolysis proved to be dependent on the pH value. The addition of H2O2 to UV treatment improved NP degradation. The application of UV photolysis and the H2O2/UV system at pH 7 resulted in low pseudo first-order rate constants at 10-4 sec-1. In the experiments at elevated pH values the pseudo-first order rate constants increased to 10-3 sec-1. The efficacy of the Fenton process was lower in comparison with UV and hydrogen peroxide photolysis. The addition of UV irradiation to the H2O2/Fe2+ system substantially improved NP degradation efficacy. In terms of performance, the photo-Fenton process was similar to the H2O2/UV process. The most favourable process for complete nonylphenol degradation considering both operational cost and treatment efficacy was H2O2/UV at pH 11 and 250 mol/L H2O2. 相似文献
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55.
系统研究了在天然日光和高压汞灯照射下十二烷基苯磺酸钠(SDBS)在蒸馏水、人工海水和天然海水中的光降解情况。结果发现,SDBS的光化学氧化的速率会受到溶液介质、光源、重金属离子、光敏剂以及pH的影响。SDBS的光化学氧化反应符合一级动力学规律,其一级反应速率常数为0.0184 min-1~0.0281 min-1。SDBS在蒸馏水中的光降解速率大于在人工海水和天然海水中的光降解速率,其主要原因是蒸馏水中溶解更多的氧。天然海水中重金属离子Zn2+和Cd2+能加快SDBS的光氧化速率,光敏剂的加入也会加快SDBS的光氧化速率。此外,酸性条件下有利于SDBS的光降解。 相似文献
56.
Parameters effect on heterogeneous photocatalysed degradation of phenol in aqueous dispersion of TiO_2 总被引:2,自引:0,他引:2
KASHIF Naeem 《环境科学学报(英文版)》2009,21(4)
In this study, photocatalytic degradation of phenol selected as model compound of organic pollutant had been investigated in aqueous titanium dioxide (TiO2) dispersion under UV irradiation. The effects of various parameters such as pH, catalyst concentration, phenol concentration, anions, metal ions, electron acceptors, and surfactants on the photocatalytic degradation of phenol were investigated. The degradation kinetics was determined by the change in phenol concentration employing UV-Vis spectrometry as a function of irradiation time. The degradation kinetics of phenol follows pseudo first-order kinetics. The results showed a significant dependence of the photocatalytic degradation of phenol on the functional parameters. The probable promising roles of the additives on the degradation process were discussed. 相似文献
57.
Kinetic adsorption of application of carbon nanotubes for Pb(II) removal from aqueous solution 总被引:1,自引:0,他引:1
Nassereldeen A Kabbashi Muataz A Atieh Abdullah Al-Mamun Mohamed E S Mirghami MD Z Alam Noorahayu Yahya 《环境科学学报(英文版)》2009,21(4)
The capability of carbon nanotubes (CNTs) to adsorb lead (Pb) in aqueous solution was investigated. Batch mode adsorption experiment was conducted to determine the effects of pH, agitation speed, CNTs dosage and contact time. The removal of Pb(II) was reach to maximum value 85% or 83% at pH 5 or 40 mg/L of CNTs, respectively. Higher correlation coefficients from Langmuir isotherm model indicates the strong adsorptions of Pb(II) on the surface of CNTs (adsorption capacity Xm = 102.04 mg/g). From this study, the results indicates that the highest percentage removal of Pb (96.03%) can be achieved at pH 5, 40 mg/L of CNTs, contact time 80 min, and agitation speed 50 r/min. 相似文献
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59.
The biosorption characteristics of Cs(I) ions from aqueous solution using exopolymers (PFC02) produced from Pseudomonas
fluorescens C-2 were investigated as a function of pH, biosorbent dosage, contact time and initial concentration. pH played a major role
in the adsorption process, and the optimum pH for the removal of Cs(I) was 8.0. Langmuir, Freundlich and Dubinin-Radushkevich (D-R)
models were applied to describe the biosorption isotherm of the Cs(I) ions by PFC02. The Lagergren first-order, pseudo second-order
kinetic and intraparticle diffusion models were used to test the kinetic data. Langmuir model and D-R model fitted the equilibrium data
better than the Freundlich isotherm. The monolayer adsorption capacities of PFC02 as obtained from Langmuir isotherm at 25°C was
found to be 32.63 mg/g. From the D-R isotherm model, the mean free energy was calculated as 26.73 kJ/mol, indicating that the
biosorption of cesium was chemisorption. The biosorption process was rapid, and the kinetic rates were best fitted to the pseudo
second-order model, which indicated the biosorption process operated through chemisorption mechanism. FT-IR analysis of PFC02
showed the possible functional groups responsible for cesium adsorption were hydroxyl, carboxyl, carbonyl and sulphonate groups.
SEM analysis showed the porous structure of the material while EDX analysis confirmed the adsorption of Cs(I) on PFC02. Cesium
adsorbed onto the PFC02 could be desorbed efficiently using 1 mol/L HNO3, and the enrichment factor was 50.0. Furthermore, PFC02
could be reused five times with only about 8.25% regeneration loss. The developed method was successfully utilized for the removal of
Cs(I) ions from aqueous solution. 相似文献
60.
Material conversion from paper sludge ash (PSA) in NaOH solution was attempted to synthesize the adsorbent for removal of
inorganic pollutants, such as Pb2+, NH4
+ and PO4
3?? from aqueous solution. PSA of 0.5 g was added into 10 mL of 3 mol/L NaOH
solution, and then heated at 80, 120, and 160°C for 6–48 hr to obtain the product. PSA mainly composed of two crystalline phases,
gehlenite (Ca2Al2SiO7) and anorthite (CaAl2Si2O8), and amorphous phase. Hydroxysodalite (Na6Al6Si6O24 8H2O) was formed at
80°C, and anorthite dissolved, whereas gehlenite remained una ected. Katoite (Ca3Al2SiO4(OH)8) was formed over 120°C, and
hydroxycancrinite (Na8(OH)2Al6Si6O24 2H2O) was formed at 160°C, due to the dissolution of both gehlenite and anorthite. Specific
surface areas of the products were almost same and were higher than that of raw ash. Cation exchange capacities (CECs) of the products
were also higher than that of raw ash, and CEC obtained at lower temperature was higher. Removal abilities of products for Pb2+, NH4
+,
and PO4
3?? were higher than that of raw ash.With increasing reaction temperature, the removal e ciencies of Pb2+ and NH4
+ decreased
due to the decrease of CEC of the product, while removal e ciency for PO4
3?? was almost same. The concentrations of Si and Al in the
solution and the crystalline phases in the solid during the reaction explain the formation of the product phases at each temperature. 相似文献