Capillary rise and sorption ability of hemp fibers oxidized by non-selective oxidative agents: hydrogen peroxide and potassium permanganate

2021 ◽  
pp. 1-16
Author(s):  
Jovana Z. Milanovic ◽  
Milena Milosevic ◽  
Ivona Jankovic-Castvan ◽  
Mirjana M. Kostic
Keyword(s):  
Hydrogen Peroxide ◽  
Potassium Permanganate ◽  
Capillary Rise ◽  
Hemp Fibers ◽  
Sorption Ability ◽  
Oxidative Agents

Effect of Oxidant on the Leaching Rate of Indium from Water Quenching Slag

2013 ◽  
Vol 591 ◽  
pp. 122-125
Author(s):  
Li Jiao Yang ◽  
Si Chen ◽  
Yan Zhang ◽  
Nan Chun Chen ◽  
Jun Gao ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Sulfuric Acid ◽  
Potassium Permanganate ◽  
Crystal Violet ◽  
Acid Leaching ◽  
Water Quenching ◽  
Test Results ◽  
Leaching Rate ◽  
Initial Concentration ◽  
Solid Ratio

Extracting indium from water quenching slag, which contains poor indium, by two process of leaching, the effect of different oxidants and dosages on the leaching rate of indium in water quenching slag were studied. The leaching conditions: temperature 80 °C, leaching time 2 h, the liquid to solid ratio of neutral leaching 8︰1, the liquid to solid ratio of acid leaching 2︰1, initial concentration of sulfuric acid 500 g·L-1, adding different oxidants, the concentration was detected by crystal violet spectrophotometry. Test results showed that the leaching rate of indium was significantly improved by adding hydrogen peroxide and potassium permanganate. Compared with the effect of different oxidants, the effect of potassium permanganate was significantly higher than that of hydrogen peroxide on the leaching rate of indium.

scholarly journals Infiltration Kinetics of Wetting in a Building Plaster and the Effect of Added Glass and Hemp Fibers

2013 ◽  
Vol 2013 ◽  
pp. 1-8
Author(s):  
Serge Gassita ◽  
Laurent Marmoret ◽  
Anne Perwuelz ◽  
Hassen Beji
Keyword(s):  
Moisture Content ◽  
Specific Surface ◽  
Experimental Technique ◽  
Pore Radius ◽  
Structural Parameters ◽  
Capillary Rise ◽  
Hemp Fiber ◽  
Hemp Fibers ◽  
Kinetics Of ◽  
Degree Of Heterogeneity

Capillary rise is an important cause of deterioration for plaster in building. This phenomenon has been studied by the tensiometric experimental technique. Structural and hydric characteristics of plaster have been determined. Decane, a perfectly impregnate fluid, has been used to calculate the porous constant characteristic called and other structural parameters like pore radius and specific surface. Evaluation of the sensibility of plaster for water has been evaluated in a second time. The angle constant and the capillary moisture content have been determined. A comparison between results for plaster and composite plaster with fiber has been done. The addition of glass and hemp fiber does not have important effect on hydric properties (angle constant), but we have observed influence on structural charecteristics (pore radius, porosity, and degree of heterogeneity).

scholarly journals New molluscicides in control of freshwater snails – intermediate hosts for causative agents of fascioliasis, paramphistomatosis and orientobilharziasis

2020 ◽  
Author(s):  
N. E. Yuldashev ◽  
Keyword(s):  
Hydrogen Peroxide ◽  
Potassium Chloride ◽  
Ammonium Sulfate ◽  
Potassium Permanganate ◽  
Freshwater Snail ◽  
Mineral Fertilizers ◽  
Freshwater Snails ◽  
Table Salt ◽  
Intermediate Hosts ◽  
Causative Agents

The article presents the results of studying the new and affordable means for freshwater snail control. It was found that mineral fertilizers – ammonium sulfate at a concentration of 0.05–0.2%, and potassium chloride at a concentration of 0.2–0.3% cause the death of snails of the genera Lymnae and Planorbis in 24–72 hours after application. Hydrogen peroxide at a concentration of 1:40000 and potassium permanganate at a concentration of 1:400000 also kill snails within 24–48 hours. Commonly available products also have pronounced molluscicidal action: table salt (NaCl) and baking soda (NaHCO3) at concentrations of 0.3–0.5%. Changing the pH in the habitat of snails, i.e. waters in snail biotopes, towards acidity (3.8–6.2) and alkalinity (8.0–8.4) also result in the death of snails, and the optimal environment is with pH = 7.8. These means are safe for animals and the environment, as evidenced by the results of experiments carried out on sheep, which were administered with molluscicide solutions forcibly using a probe in an amount of 1.5 liters and by free drinking for 3 days.

Synergetic Oxidation in Alkaline In-Situ Leaching Uranium: A Preliminary Case Study

2020 ◽  
Author(s):  
Wensheng Liao ◽  
Weimin Que ◽  
Liming Wang ◽  
Zhiming Du
Keyword(s):  
Hydrogen Peroxide ◽  
Potassium Permanganate ◽  
Early Stage ◽  
No Oxidation ◽  
Complexing Agent ◽  
Uranium Deposits ◽  
Sodium Dichloroisocyanurate ◽  
Uranium Minerals ◽  
Low Efficiency

Abstract In alkaline in-situ leaching uranium, oxygen is the most common oxidizer with bicarbonate as a complexing agent. For those sandstone uranium deposits with strongly reductive capacity or complicated hydrogeological environment, the oxidation by oxygen is low efficiency. An efficient leaching method, therefore, is needed for these uranium deposits. In this study, a typical sandstone uranium deposit which characterizes with high TDS and high chloride content in groundwater and intractable uranium leach is selected to investigate the effects of synergetic oxidation by a strong oxidant with oxygen. Based on the research on batch leach, pressure leach and field trials, the oxidants such as hydrogen peroxide, potassium permanganate and sodium dichloroisocyanurate (NaDCC) are tested. The results of pressure batch leach indicate that synergetic oxidization is achieved by NaDCC in oxygen leaching process. Leaching tests indicate that a minor oxidizer of NaDCC shows good synergetic oxidization with oxygen and leaching effects on uranium minerals. The results also demonstrate that hydrogen peroxide shows no oxidation effects when it is used as a single oxidant. While potassium permanganate shows good oxidation on uranium when it is used as a single oxidant, however, it leads inhibiting effects on oxygen oxidation on uranium minerals. The further field tests are conducted to study the synergetic effects of oxygen with and without sodium dichloroisocyanurate. The preliminary results indicate that a fast leach is observed by the composite oxidants in early stage while no synergetic leach is found after 200 days. Further studies should be conducted in laboratory experiments and pilot scale tests for its potential applications.

scholarly journals Using Advanced Spectroscopy and Organic Matter Characterization to Evaluate the Impact of Oxidation on Cyanobacteria

Toxins ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 278 ◽  
Author(s):  
Saber Moradinejad ◽  
Caitlin M. Glover ◽  
Jacinthe Mailly ◽  
Tahere Zadfathollah Seighalani ◽  
Sigrid Peldszus ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Potassium Permanganate ◽  
Drinking Water Treatment ◽  
Carbon And Nitrogen ◽  
Toxic Cyanobacteria ◽  
Nitrogen Detection ◽  
Algal Organic Matter ◽  
Organic Matter Fractions ◽  
The Impact

Drinking water treatment plants throughout the world are increasingly facing the presence of toxic cyanobacteria in their source waters. During treatment, the oxidation of cyanobacteria changes cell morphology and can potentially lyse cells, releasing intracellular metabolites. In this study, a combination of techniques was applied to better understand the effect of oxidation with chlorine, ozone, potassium permanganate, and hydrogen peroxide on two cell cultures (Microcystis, Dolichospermum) in Lake Champlain water. The discrepancy observed between flow cytometry cell viability and cell count numbers was more pronounced for hydrogen peroxide and potassium permanganate than ozone and chlorine. Liquid chromatography with organic carbon and nitrogen detection was applied to monitor the changes in dissolved organic matter fractions following oxidation. Increases in the biopolymer fraction after oxidation with chlorine and ozone were attributed to the release of intracellular algal organic matter and/or fragmentation of the cell membrane. A novel technique, Enhanced Darkfield Microscopy with Hyperspectral Imaging, was applied to chlorinated and ozonated samples. Significant changes in the peak maxima and number of peaks were observed for the cell walls post-oxidation, but this effect was muted for the cell-bound material, which remained relatively unaltered.

Role of oxidants and disinfectants on the removal, masking and generation of tastes and odours

2004 ◽  
Vol 49 (9) ◽  
pp. 297-306 ◽  
Author(s):  
A. Bruchet ◽  
J.P. Duguet
Keyword(s):  
Hydrogen Peroxide ◽  
Case Studies ◽  
Potassium Permanganate ◽  
Chlorine Dioxide ◽  
Masking Effect ◽  
Negative Effects ◽  
Anthropogenic Pollutants ◽  
Drinking Waters ◽  
By Products

This paper summarises the positive and negative effects of the most commonly used oxidants and disinfectants: chlorine, chloramines, chlorine dioxide, potassium permanganate ozone, and advanced oxidation with ozone/hydrogen peroxide on tastes and odours present in natural and drinking waters. The case studies reported illustrate the generation of odorous by-products such as chlorophenols, iodoforms, aldehydes, the masking effect between earthy-musty and chlorinous odours, and the removal of odorous algal metabolites or anthropogenic pollutants by ozone alone or by ozone coupled with hydrogen peroxide.

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