Characteristics of p-chlorophenol degradation by Photo Fenton oxidation

This study investigated the characteristics of Photo Fenton oxidation in comparison with Fenton oxidation in dark environments. The specific objective was to provide an in-depth understanding as to how the presence of UV would effect the reaction and its efficiency as compared to the Dark Fenton Oxidation. All reactions were carried out in batch mode at an initial pH of 3.5, with H2O2 in excess and iron in catalytic concentrations. The medium pressure mercury lamp (320-400 nm) was used as a UV source. The role of UV in Photo Fenton Oxidation of p-chlorophenol was found to be manyfold as compared to Dark Fenton Oxidation. It included the expedition of ferric ion reduction and the photolysis of H2O2, which exerted a direct impact on the p-chlorophenol degradation kinetics by enhancing the production of OH radical. Also included in the role was alteration of the quantity (and potentially quality) of intermediates, which would lead to a change in the decomposition kinetics in an indirect manner. Therefore, it was concluded that the performance of Photo Fenton Oxidation as compared to Dark Fenton Oxidation could vary in complicated ways depending upon the characteristics of target compounds and their intermediates.

Download Full-text

Counting Penguins

Mathematics Teacher ◽

10.5951/mt.91.2.0110 ◽

1998 ◽

Vol 91 (2) ◽

pp. 110-116 ◽

Cited By ~ 1

Author(s):

Mike Perry ◽

Gary Kader

Keyword(s):

Sample Size ◽

Random Sampling ◽

Population Distribution ◽

Statistical Concept ◽

Specific Objective ◽

Random Samples ◽

Repeated Sampling ◽

Simulated Sampling

The nctm's curriculum standards for statistics give a specific objective for students in grades 9–12: to “understand sampling and recognize its role in statistical claims” (NCTM 1989, 167). The use of random samples for estimation is a fundamental statistical concept. Random sampling and its consequences can be studied through simulated sampling activities. The nature of sampling variability, the influence of sample size on the quality of estimation, and the role of the underlying population distribution are ideas that can be illustrated with repeated sampling.

Download Full-text

Study of Advanced Oxidation Technology on Post Treatment Wastewater of Pulp & Paper Mills

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.955-959.2697 ◽

2014 ◽

Vol 955-959 ◽

pp. 2697-2700

Author(s):

Ting Zhi Liu ◽

Shuai Li ◽

Fang Chang ◽

Hao Yu Wang

Keyword(s):

Fenton Oxidation ◽

Treated Wastewater ◽

Treatment Technology ◽

Reaction Conditions ◽

Paper Mills ◽

Initial Ph ◽

Advanced Oxidation Technology ◽

Oxidation Technology ◽

Optimized Conditions

In this article, Fenton oxidation treatment technology was employed to the improving of quality of post treated wastewater from pulp & paper mills in order to increase the recycling ratio of final treated wastewater. The reaction conditions were optimized through single-factor experiments and the removal of color were tested for the optimizing. It was found in this study that the color of Fenton oxidation treated water was variegated with the extending of settling time. The optimized conditions were: Dosage of H2O2 was 682.1mg/L(30% m/m), 1.5 times theoretical consumption, 205mg/L FeSO47H2O (H2O2:FeSO4=15:1), the initial pH and the reaction time were 4.5 and 40min, respectively. The removal of the color and COD were 51.3% and 80% after Fenton treatment. GC-MS analysis shown that the contents of organic extracts and most of organic compounds reduced significantly after the oxidational treatment.

Download Full-text

Cognitive Health Counseling 40+

Zeitschrift für Gesundheitspsychologie ◽

10.1026/0943-8149/a000085 ◽

2013 ◽

Vol 21 (1) ◽

pp. 24-33 ◽

Cited By ~ 1

Author(s):

Anne Eschen ◽

Franzisca Zehnder ◽

Mike Martin

Keyword(s):

Outcome Variable ◽

Pilot Phase ◽

Subjective Memory ◽

Cognitive Health ◽

Health Counseling ◽

Agents Of Change ◽

Main Outcome Variable ◽

Further Development

This article introduces Cognitive Health Counseling 40+ (CH.CO40+), an individualized intervention that is conceptually based on the orchestration model of quality-of-life management ( Martin & Kliegel, 2010 ) and aims at improving satisfaction with cognitive health in adults aged 40 years and older. We describe the theoretically deduced characteristics of CH.CO40+, its target group, its multifactorial nature, its individualization, the application of subjective and objective measures, the role of participants as agents of change, and the rationale for choosing participants’ satisfaction with their cognitive health as main outcome variable. A pilot phase with 15 middle-aged and six older adults suggests that CH.CO40+ attracts, and may be particularly suitable for, subjective memory complainers. Implications of the pilot data for the further development of the intervention are discussed.

Download Full-text