scholarly journals Effect of temperature on capping efficiency of zeolite and activated carbon under fabric mats for interrupting nutrient release from sediments

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Seung-Hee Hong ◽  
Jae-In Lee ◽  
Chang-Gu Lee ◽  
Seong-Jik Park
Keyword(s):  
Activated Carbon ◽  
Nutrient Release ◽  
Nonwoven Fabric ◽  
Effect Of Temperature ◽  
Overlying Water ◽  
P Release ◽  
Incubation Experiments ◽  
Different Temperatures ◽  
Influence Of Temperature On ◽  
Do Concentration

Abstract We investigated the influence of temperature on the capping efficiency to interrupt the release of nutrients from lake sediments. A 3-cm layer of Zeolite (ZL) or activated carbon (AC) was placed on the contaminated sediments, and nonwoven fabric mats (NWFM) were placed on top of these capping materials. Laboratory incubation experiments were performed under three different temperatures, namely 4, 15, and 30 °C. Under the uncapped condition at 30 °C, dissolved oxygen (DO) was depleted after 30 days, while at 4 °C and 15 °C, DO was present until the end of this experiment. DO concentration in overlying water was more dependent on the temperature than capping condition. ZL/NWFM effectively blocked the release of N from the sediments, and the capping efficiencies of ZL/NWFM for NH4-N at 4, 15, and 30 °C were 98%, 96%, and 94%, respectively. For the interruption of P release, both ZL/NWFM and AC/NWFM were not effective at 4 and 15 °C. At 30 °C, however, AC/NWFM was effective, and its capping efficiencies at 30 °C for PO4-P and T-P were 74.0% and 79.9%, respectively. In summary, nutrient release from sediments was accelerated at higher temperatures, and the effect of capping was significant at high temperature.

Effect of temperature on composite films made with activated carbon, graphite, or graphene oxide (GO) in a gelatin matrix

BioResources ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 77-95
Author(s):  
Siqiao Yang ◽  
Haichao Li
Keyword(s):  
Contact Angle ◽  
Activated Carbon ◽  
Water Absorption ◽  
Composite Films ◽  
Effect Of Temperature ◽  
Gelatin Matrix ◽  
Vapour Permeability ◽  
Blending Method ◽  
The Matrix ◽  
Different Temperatures

Activated carbon, graphite, and GO/gelatin composite films were prepared by the blending method. The properties of composites were characterized by tensile strength (TS), elongation at break (EB), water vapour permeability (WVP), water-absorption ability, contact angle, scanning electron microscopy (SEM), and moisture at different temperatures. The properties of GO/gelatin composite films were better when each of three kinds of carbon materials were used as reinforcement phases and added into the matrix gelatin. The results showed that EB and TS of GO/gelatin composite films were both excellent. The moisture of GO/gelatin composite films was greater than the others. SEM micrographs showed that GO had better compatibility and dispersibility with gelatin than activated carbon and graphite. The water absorption of GO/gelatin composite films were low, at 15 °C and 25 °C, and the WVP was low at 35 °C. The WVP of GO/gelatin composite films was lower than the others at different temperatures. The contact angle of GO/gelatin composite films was larger than the others.

The Influence of Temperature on the Galvanic Corrosion in Multi-Material System in Seawater

2015 ◽  
Vol 1101 ◽  
pp. 225-228
Author(s):  
Chun Li Wang ◽  
Jian Hua Wu
Keyword(s):  
Corrosion Behavior ◽  
Galvanic Corrosion ◽  
Effect Of Temperature ◽  
Material System ◽  
Ni Alloy ◽  
Different Temperatures ◽  
Influence Of Temperature On ◽  
Zero Resistance ◽  
Increasing Temperature ◽  
Surface Morphologies

The galvanic corrosion behavior of titanium (TA2)/Cu-Ni alloy (B10)/low alloy steel (921A) multi-material system has been studied using a zero-resistance ammeter (ZRA) in seawater at different temperatures. After the tests, the surface morphologies of the samples were detected by SEM. Results showed galvanic corrosion behavior of TA2/B10/921A fulfill the mixed potential theory, 921A acts as the anode and both TA2 and B10 act as the cathodes. The effect of temperature on the galvanic corrosion is important, the corrosion rate increases with increasing temperature.

scholarly journals THE EFFECT OF TEMPERATURE ON THE PERFORMANCE OF ACTIVATED CARBON OVER CATALYTIC CRACKING OF CRUDE PALM OIL

2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Nazarudin Nazarudin ◽  
Ulyarti Ulyarti ◽  
Oky Alfernando ◽  
Ira Galih ◽  
Susilawati Susilawati ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Palm Oil ◽  
Active Carbon ◽  
Catalytic Cracking ◽  
Effect Of Temperature ◽  
Crude Palm Oil ◽  
Carbon Catalyst ◽  
Different Temperatures ◽  
Higher Temperature ◽  
Catalyst Increase

This research was carried out to investigate the effect of temperature in carbon production on its performance in the catalystic cracking of CPO to fuel.  The carbon was produced using palm shell at 2 different temperatures (450 and 550oC).  The cracking of CPO was carried out with and without the active carbon catalyst.  The result showed that the use of catalyst increase the conversion of both gas and liquid conversion.  The use of higher temperature in the production of active carbon catalyst increased the performance of the catalyst, in particular, for the liquid conversion. Keywords :Activated carbon, catalyst, catalytic cracking, crude palm oil

scholarly journals Kinetics and Thermodynamics of the Adsorption of Lead (II) on a Activated Carbon from Coconut Shells

2013 ◽  
Vol 15 (4) ◽  
pp. 283 ◽  
Author(s):  
L. Largitte ◽  
P. Lodewyckx
Keyword(s):  
Activated Carbon ◽  
Standard Enthalpy ◽  
Rate Constants ◽  
Equilibrium Constants ◽  
Activation Parameters ◽  
Effect Of Temperature ◽  
Standard Entropy ◽  
Exponential Factor ◽  
Different Temperatures ◽  
Coconut Shells

The effect of temperature on the adsorption of lead by an activated carbon from coconut shells is investigated. The pseudo second order equation is applied to the kinetic data obtained at different temperatures in order to determine the adsorption rate constants at these temperatures. Then, the Arrhenius equation is applied to the rate constants to determine the activation energy of the sorption reaction and the pre-exponential factor. By applying the Eyring equation to the rate constants, the standard thermodynamic activation parameters of the sorption reaction can also be calculated. In addition, the isotherms of lead adsorption on the activated carbon from coconut shells, at different temperatures, are determined and fitted by the Langmuir equation. The Van’t Hoff equation is applied to the Langmuir equilibrium constants in order to determine the standard enthalpy of the sorption reaction. The other standard thermodynamic parameters<br />(Gibbs standard enthalpy and standard entropy) are deduced. The isosteric standard sorption enthalpy is also determined by using both the classical approach and an adapted Clausius Clapeyron equation. The results are identical. The value obtained is higher, but more correct than that of Langmuir. On the basis of these<br />thermokinetic parameters, the activated carbon from Coconut shells can be considered as a very efficient carbon for the sorption of lead and its sorption efficiency (rate and quantity) increase with the temperature.

scholarly journals Preparation of Activated Carbon from Desiccated Coconut Residue by Chemical Activation with NaOH

2015 ◽  
Vol 5 (1) ◽  
pp. 24 ◽  
Author(s):  
Mohd Adib Yahya ◽  
C. W. Zanariah C. W. Ngah ◽  
M. A. Hashim ◽  
Z. Al-Qodah
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Agricultural Waste ◽  
Chemical Activation ◽  
Nitrogen Atmosphere ◽  
Effect Of Temperature ◽  
Impregnation Ratio ◽  
Different Temperatures

<p class="1Body">This study investigates the effect of temperature and impregnation ratio on the physicochemical properties of activated carbon prepared from agricultural waste; desiccated coconut residue (DCR) by chemical activation using sodium hydroxide (NaOH). DCR sample was first carbonized at three different temperatures for 1 hour at 400°C, 500°C, and 600°C respectively. The resulting chars were impregnated with NaOH at three different impregnation ratio; 1:1, 1:2, and 1:3 respectively and activated under nitrogen atmosphere for 1 hour at three different temperatures based on its carbonization temperature. The specific surface area was strongly affected by impregnation ratio in which increased with impregnation ratio. The specific surface area also increased with temperature but then decreased at highest desired temperature.</p>

Phenotypic plasticity of pigmentation and morphometric traits inPnigalio soemius(Hymenoptera: Eulophidae)

2007 ◽  
Vol 97 (1) ◽  
pp. 101-109 ◽  
Author(s):  
U. Bernardo ◽  
P.A. Pedata ◽  
G. Viggiani
Keyword(s):  
Morphological Traits ◽  
Phenotypic Variability ◽  
Economic Importance ◽  
Effect Of Temperature ◽  
Morphometric Traits ◽  
Influence Of Temperature ◽  
Natural Hosts ◽  
Different Temperatures ◽  
Influence Of Temperature On ◽  
Range Of Variation

AbstractSpecies of the genusPnigalioSchrank are ectoparasitoids on several pest insects. Most species are polyphagous parasitoids of lepidopteran and dipteran leafminers. Despite their potential economic importance, information on intraspecific phenotypic variability is insufficient.Pnigalio soemius(Walker) was reared at five different temperatures (10, 15, 20, 25, 30°C) on mature larvae of one of its natural hosts,Cosmopterix pulchrimellaChambers (Lepidoptera: Cosmopterigidae), to investigate the influence of temperature on size, colour and other morphological traits, and to measure the range of variation of several characters. Thermal developmental reaction norms, which represent the effect of temperature during growth and development on the value of some adult traits, were produced. The results confirmed the influence of temperature on numerous characters and that these characters had a larger range of variation than realized previously in the construction of taxonomic keys to species. In particular, the number and position of the costulae on the propodeum and colour of the gaster were affected by rearing temperature.

scholarly journals Aplikasi Carbon Nano Fiber Terintegrasi dengan Karbon Aktif Serabut Kelapa untuk Pengolahan Limbah Laundry

2017 ◽  
Vol 1 (2) ◽  
pp. 277
Author(s):  
Asih Melati
Keyword(s):  
Water Quality ◽  
Activated Carbon ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Effect Of Temperature ◽  
Argon Gas ◽  
Coconut Husk ◽  
Cvd Method ◽  
Nano Fiber ◽  
Do Concentration

The study effect of temperature on the morphology of carbon nanotube (CNF) based coconut husk has been done. CNF is one of the nanotechnology products that can be applied to reduce the concentration of the especially Pb, Cd, Ni. Thepurpose of this study are temperature effect on CNF and determine the potential uses treatment of CNF in the laundry waste. The Growth of CNF used the chemical vapor deposition (CVD) method with a temperature variation of 6000 C,7000 C, and 8000 C. CNF synthesis involves reacting activated carbon from coconut shell, ferrocene (Fe(C5H5)2) as a catalyst, benzene as the carbon source,and argon gas flowed. The Purification of CNF using nitric acid (HNO3) 65%. The result of Energy Dispersive Spestroscopy (EDS) characterization indicate that increasing temperatures indicate increasing carbon content. CNF as adsorbent deposited on the laundry waste. The water quality test of the laundry waste showed that the adsorption of CNF likely reduce Pb level at 67,4% at a temperature of 6000C and DO concentration increases. CNF T has no effect on the amount of PH and Cd, while BOD and COD consentration increases. 

scholarly journals Effect of Temperature on Life History of Bemisia Tabaci (Gennadius) (Homoptera: Aleyrodidae) on Cassava Manihot Esculenta Crantz

2021 ◽  
Vol 4 (1) ◽  
pp. 912-920
Author(s):  
Nguyen Duc Khanh ◽  
Le Ngoc Anh ◽  
Ho Thi Thu Giang
Keyword(s):  
Life History ◽  
Bemisia Tabaci ◽  
Effect Of Temperature ◽  
Degree Days ◽  
Manihot Esculenta Crantz ◽  
Developmental Threshold ◽  
Wide Range ◽  
Important Pest ◽  
Different Temperatures ◽  
Influence Of Temperature On

The aim of the present study was to evaluate the relationships between environmental temperatures and life-history traits of whitefly Bemisia tabaci on cassava in the Northern part of Vietnam. The influence of temperature on the biological characteristics of whitefly B. tabaci fed on cassava was evaluated at 20ºC, 25ºC, 27.5ºC, and 30ºC using individual insect rearing methodology. Results of the study showed that the development time from egg to adult of B. tabaci was influenced by temperatures. The data indicated that under different temperatures (20ºC, 25ºC, 27.5ºC, and 30ºC), the life cycle of B. tabaci were 41.46, 28.64, 24.29, and 20.25 days, respectively. The determination of lower developmental threshold and degree days for whitefly development were 11.2ºC and 344.8 degree-days. There were 14.31 whitefly generations within 1 year on cassava suggesting this plant is a suitable host plant for the development and reproduction of B. tabaci. Female longevity ranged from 4.92 to 10.23 days. The fecundity ranged from 49.3 to 74.0 eggs/female. The mortality rate reached its highest rate of 36.27% at 30ºC. Our results suggested that B. tabaci had high reproduction rates and demonstrated their positive fitness traits on cassava in a wide range of temperatures, being a potential important pest of cassava cultivars.

scholarly journals The effect of temperature on pollen germination and pollen tube growth of sour cherry cultivars

2014 ◽  
Vol 59 (1) ◽  
pp. 45-52 ◽  
Author(s):  
Dragan Milatovic ◽  
Dragan Nikolic
Keyword(s):  
Pollen Tube ◽  
Pollen Tube Growth ◽  
Pollen Germination ◽  
Pollen Grains ◽  
Sour Cherry ◽  
Tube Growth ◽  
Effect Of Temperature ◽  
Different Temperatures ◽  
Influence Of Temperature On

The study was carried out to determine the effect of three different temperatures (5, 15 and 25?C) on in vitro pollen germination and pollen tube growth of five sour cherry cultivars: ?Heimanns Konservenweichsel?, ?Kelleriis 14?, ?Oblacinska?, ?Rexelle? and ?Sumadinka?. Pollen germination a % agar % Temperature significantly affected pollen germination. High germination rates (50-70%) were obtained at both 15?C and 25?C. Satisfactory germination rates (42-51%) were also obtained at 5?C in some cultivars (?Rexelle?, ?Sumadinka? and ?Heimanns Konservenweichsel?). The influence of temperature on the pollen tube growth was more prominent. The length of pollen tubes was three to six times higher at 15?C and 25?C in comparison with 5?C. This has led to the conclusion that the temperature of 5?C, although it could be adequate for pollen germination, is not high enough for optimal pollen tube growth. was determined by germinating pollen grains in culture medium containing 0.7agar-and 15sucrose.

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