scholarly journals EFFECT OF TEMPERATURE ON RICE HUSK ASING AND ITS APPLICATION ON ADSORBING FE AND ZN METAL IN PATCHOULI OIL

2014 ◽  
Vol 14 (2) ◽  
pp. 71-86
Author(s):  
Ahmad Said ◽  
Is Fatimah ◽  
Dwiarso Rubianto
Keyword(s):  
Rice Husk ◽  
Effect Of Temperature

Preparation and Chemical Modification of Rice Husk Char for the Removal of a Toxic Dye (Orange G) from Aqueous Medium

2019 ◽  
Vol 233 (3) ◽  
pp. 375-392 ◽  
Author(s):  
Abdul Malik ◽  
Abbas Khan ◽  
Muhammad Humayun
Keyword(s):  
Rice Husk ◽  
Adsorption Process ◽  
Aqueous Media ◽  
Effect Of Temperature ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Experimental Conditions ◽  
Orange G ◽  
Adsorbent Dose

Abstract The rice husk char (RHC) was prepared by keeping a known amount of the rice husk in furnace at 400°C. The product was modified with KOH and labeled as KOH modified rice husk char (KMRHC) which was used as an adsorbent for the removal of toxic dye, Orange G (OG) from aqueous media. Variation in the experimental conditions (agitation time, dye concentration, adsorbent dose, pH and temperature) play significant role in the adsorption process. The maximum adsorption capacity of OG on KMRHC was investigated as 38.8 mg/g at pH=4 using initial dye concentrations of 80 mg/L containing 2 g/L of the adsorbent dose with agitation speed of 250 rpm at 303 K. The % adsorption of dye was inspected as 96%. Thermodynamics studies of the adsorption of OG on KMRHC indicated that the value of ΔG and ΔH were negative which revealed that the adsorption process is exothermic and spontaneous process. The negative value of ΔS suggested that randomness decreases at the interface of adsorbent–adsorbate during the adsorption process. The kinetics study indicated that the experimental data of the adsorption process best fits to pseudo-second order kinetic model. The equilibrium data was tested on Langmuir, Freundlich and Temkin adsorption isotherm models. It was inspected that data follows all the three isotherm models (R2>0.91). However, the values of correlation coefficients (R2) indicated that the data is best fit to the Langmuir isotherm model (R2>0.99) which suggest for chemi-sorption process. The effect of temperature (303–343 K) shows that by varying the temperature the adsorption process is significantly affected. The general trend indicates that adsorption efficiency is higher at lower temperature as compared to higher temperature. This trend also suggests that the adsorption coefficient (K), rate of adsorption, and hence the spontaneity of adsorption process also decreases with raising the temperature.

scholarly journals A Comparative Study of the Adsorption of Crystal Violet Dye from Aqueous Solution on Rice Husk and Charcoal

2020 ◽  
Vol 17 (1(Suppl.)) ◽  
pp. 0295
Author(s):  
Souad Abd Mousa
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Rice Husk ◽  
Crystal Violet ◽  
Adsorption Process ◽  
Positive Impact ◽  
Effect Of Temperature ◽  
Isotherm Models ◽  
Crystal Violet Dye ◽  
The Impact

            In this work, the adsorption of crystal violet dye from aqueous solution on charcoal and rice husk has been investigated, where the impact of variable factors (contact time; the dosage of adsorbent, pH, temperature, and ionic strength) have been studied. It has been found that charcoal and rice husk have an appropriate adsorption limit with regards to the expulsion of crystal violet dye from fluid arrangements. The harmony adsorption is for all intents and purposes accomplished in 45 min for charcoal and 60 min for rice husk. The amount of crystal violet dye adsorbed (0.4 g of charcoal and 0.5 g of rice husk) increased with an increasing pH and the value of 11 is the best. The effect of temperature on the adsorption process was studied at the range (298-323) K. The test comes about were broken down by utilizing Freundlich and Tempkin isotherm models, where the Freundlich and Tempkin factors were determined, and it has been found that the adsorption isotherm obey the Freundlich isotherm. The effect of ionic strength on the adsorption process was studied also via sodium chloride electrolyte solution; the results have been revaled that the sodium ion has a positive impact on the adsorption process. The thermodynamic parameters are shown estimated as ∆H values were 2.8012 kJ mol-1 and 5.8252 kJ mol-1 for charcoal and rice husk, respectively; this behavior referred to endothermic adsorption.

Torrefaction of Biomass: Effect of Temperature on the Properties of Liquid and Gaseous Products

2014 ◽  
Vol 1070-1072 ◽  
pp. 131-135
Author(s):  
Deng Yu Chen ◽  
Qian Li ◽  
Yong Chen ◽  
Yan Sun ◽  
Xiu Ling Sun
Keyword(s):  
Rice Husk ◽  
Laboratory Scale ◽  
Fuel Properties ◽  
Effect Of Temperature ◽  
Gaseous Products ◽  
Noncondensable Gas ◽  
Liquid Products ◽  
Different Temperatures ◽  
Gas Products ◽  
Acetic Acids

The torrefaction of rice husk was performed in a laboratory-scale torrefaction reactor at different temperatures (200, 230, 260, and 290 °C) for 30 min. It was found that the decomposition of hemicellulose was the direct reason for changes in the fuel properties of solid products after torrefaction. As the torrefaction temperature rose from 200 °C to 290 °C, the yield of torrefied rice husk decreased gradually from 97.47% to 67.03%, whereas the yields of liquid and noncondensable gas products increased from 2.01% to 15.67% and from 0.52% to 17.30%, respectively. Liquid products contained water and a small amount of acetic acids. CO2 and CO were the main gas products of rice husk torrefaction.

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