scholarly journals Adsorption Studies of Cyanide (CN)- on Rice Husk Ash (RHA)

2011 ◽  
Vol 46 (1) ◽  
pp. 101-104 ◽  
Author(s):  
S Naeem ◽  
U Zafar ◽  
T Amann
Keyword(s):  
Rice Husk ◽  
Contact Time ◽  
Rice Husk Ash ◽  
Cyanide Solution ◽  
Adsorption System ◽  
Solution System ◽  
Adsorbate Concentration ◽  
Adsorption Data ◽  
Batch Technique ◽  
Different Temperatures

In this investigation, adsorption of cyanide has been studied by means of batch-technique. Percentage adsorption was determined for Rice Husk Ash (RHA)-Cyanide solution system as a function of i) contact time, ii) pH, iii) adsorbate concentration and iv) temperature. Adsorption data has been interpreted in terms of Freundlich and Langmuir equations. Thermodynamics parameters for the adsorption system have been determined at three different temperatures. The value of ΔH°=38.326KJ/mole and ΔG°=-6.117KJ/mole at 283°K suggest that the adsorption of cyanide on RHA is an endothermic and a spontaneous process.Key words: Cyanide; Rice husk ash (RHA); Adsorption Isotherms DOI: http://dx.doi.org/10.3329/bjsir.v46i1.3524 Bangladesh J. Sci. Ind. Res. 46(1), 101-104, 2011

scholarly journals Adsorption Studies of Copper on Rice Husk Ash (RHA)

1970 ◽  
Vol 45 (4) ◽  
pp. 367-370
Author(s):  
Sumra Naeem ◽  
Naseem Zahra ◽  
Uzma Zafar
Keyword(s):  
Rice Husk ◽  
Adsorption Process ◽  
Rice Husk Ash ◽  
Copper Metal ◽  
Solution System ◽  
Freundlich Equation ◽  
Copper Solution ◽  
Adsorbate Concentration ◽  
Batch Technique ◽  
Before And After

In present investigation the adsorption of copper on rice husk ash was studied by using batch technique. The quantities of copper metal before and after the treatment of their standard solutions with rice husk ash were determined by atomic absorption spectrophotometer. Percentage adsorption was calculated for RHA-Copper solution system. The effects of various parameters, such as pH of solution, contact time, temperature and adsorbate concentration were studied. It was observed that adsorption of copper increased with increasing time, temperature, pH and decreased with increasing adsorbate concentration. Adsorption process is interpreted in terms of Freundlich equation. It was found that rice husk ash can be used as a suitable adsorbent for the removal of copper from wastewater. Key words: Adsorption; Copper; Rice husk ash DOI: 10.3329/bjsir.v45i4.7382 Bangladesh J. Sci. Ind. Res. 45(4), 367-370, 2010

scholarly journals Kinetic Study, Modelling and Optimization of Adsorption Processes for Removal of Crude Oil from Contaminated Water using Chitosan-Rice Husk Ash Composite

2018 ◽  
pp. 1-10
Author(s):  
G. G. Oseke ◽  
M. T. Isa ◽  
M. S. Galadima ◽  
A. O. Ameh
Keyword(s):  
Crude Oil ◽  
Adsorption Capacity ◽  
Rice Husk ◽  
Contact Time ◽  
Rice Husk Ash ◽  
Kinetic Studies ◽  
Contaminated Water ◽  
Adsorbent Dosage ◽  
Temkin Isotherm ◽  
Adsorbate Concentration

This study was aimed at developing chitosan-rice husk ash adsorbent for the removal of crude oil from contaminated water. Design Expert software 6.06 was used to design the adsorption experiment. The adsorption was tested for Langmuir, Freundlich and Temkin isotherms and the kinetic studies also carried out. The effect of influencing parameters such as contact time, adsorbate concentration, adsorbent dosage and formulation ratio were studied. It was generally shown that adsorption process increased with time and adsorbate concentration and decreased with adsorbent dosage. Models for the prediction of adsorption capacity for the composite was significant with R2 value of 0.8382 and P-value of 0.0017. Optimum conditions were found to be 0.90 wt/wt chitosan/silica ratio, contact time of 5 min, and oil/water ratio of 0.25 v/v, which gave 20.66 g/g sorption capacity respectively. Adsorption isotherm studies of Langmuir, Freundlich and Temkin were carried out for the chitosan-rice husk ash composite. Temkin isotherm best fitted with R2 value of 0.9999. The adsorption capacity of composite from isotherm studies was obtained to be 18.85 g/g adsorbent. The heat of adsorption bT (kJmol-1) obtained from Temkin isotherm study was -48.67 kJ/mol indicating physisorption of adsorbents to the crude oil.  Kinetic studies indicated that the pseudo-second order model suitably described the removal of crude oil by the composite with R2 value 0.9999.

scholarly journals Equilibrium and kinetic studies of Cr (VI) removal from synthetic wastewater by Acroptilon repense flower powder

2013 ◽  
Vol 15 (2) ◽  
pp. 40-47 ◽  
Author(s):  
Mohammad Taghi Ghaneian ◽  
Mohammad Hasan Ehrampoush ◽  
Asghar Mosleh Arany ◽  
Behzad Jamshidi ◽  
Mahboobeh Dehvari
Keyword(s):  
Contact Time ◽  
Kinetic Studies ◽  
Synthetic Wastewater ◽  
Initial Concentration ◽  
Russian Knapweed ◽  
Adsorbate Concentration ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Chromium Adsorption ◽  
Acroptilon Repens

In this study the removal of Cr (VI) from synthetic wastewater was investigated using Acroptilon repens (Russian Knapweed) flower powder under various conditions (pH, contact time and initial concentration of Cr). The capacity of chromium adsorption at equilibrium conditions by this biosorbent was increased by adsorbate concentration. The results also showed that the removal efficiency of Cr (VI) was increased by increasing the contact time. By increasing the initial concentration of Cr (VI) solution, chromium removal was reduced. The suitability of adsorbents and their constants was tested or evaluated with the Langmuir, Freundlich and Temkin isotherms models. The results indicated that the Freundlich and Langmuir models (R2 > 0.99) gave a better concordance to the adsorption data in comparison with the Temkin equation (R2 = 0.97). The adsorption of Cr (VI) followed the pseudo-second-order kinetics (R2 = 0.991). The study showed that Acroptilon repens flower powder can be used as an effective lignocellulosic biomaterial and biosorbent for the removal of Cr (VI) from wastewater.

scholarly journals Adsorption and equilibrium studies of phenol and para-nitrophenol by magnetic activated carbon synthesised from cauliflower waste

2019 ◽  
Vol 25 (5) ◽  
pp. 742-752 ◽  
Author(s):  
Nidhi Yadav ◽  
Dhruv Narayan Maddheshiaya ◽  
Shalu Rawat ◽  
Jiwan Singh
Keyword(s):  
Activated Carbon ◽  
Isotherm Models ◽  
X Ray Diffraction ◽  
Equilibrium Studies ◽  
First Order ◽  
Adsorbate Concentration ◽  
Adsorption Data ◽  
Pore Diffusion Model ◽  
Different Temperatures ◽  
Pseudo Second Order

In this study, waste cauliflower leaves were used for adsorbent preparation. The waste cauliflower leaves were converted into activated carbon by pyrolysis at two different temperatures 250˚C and 500˚C with magnetic property. The prepared adsorbents were denoted as CAC-250 and CAC-500 and characterized by the use of scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The adsorbents were applied for the removal of phenol and PNP from their aqueous solutions. The adsorption of phenol was found very less by the application CAC-250, whereas by the application of CAC-500 the adsorption of both phenol and PNP was enhanced. The maximum adsorption of phenol was found 99% and that of PNP was found ~100% using CAC-500, with initial adsorbate concentration 5 mg/L at 25˚C. The adsorption data was analysed with Langmuir, Freundlich and Temkin isotherm models and different kinetic models that are pseudo first order, pseudo second order, Elovich, intraparticle and pore diffusion model.

scholarly journals Adsorption of Flagyl on Prepared Ash from Rice Husk

2021 ◽  
Vol 22 (4) ◽  
pp. 11-17
Author(s):  
Haider Abbas ◽  
Ammar S. Abbas
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Primary Source ◽  
Alternative Methods ◽  
X Ray Diffraction ◽  
X Ray ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Husk Rice ◽  
Increasing Temperature

In recent years, it has been evident that searching for alternative methods with low-price and eco-friendly features that produce high-quality adsorbents is in high demand. In the present work, Rice husk from Iraqi rice named (Amber) had been used as the primary source to produce rice husk ash (RHA) for the removal of the antibiotic metronidazole (Flagyl) from water. After optimum drying of rice husk, rice husk ash (RHA) was obtained at 600 °C using an electric oven. RHA has been investigated for properties using X-ray diffraction (XRD), porosity, and surface area (SA). The experimental work adsorption data were optimized to evaluate Langmuir and Freundlich constants. The thermodynamic parameters likely a change in Gipp's energy (ΔG), enthalpy (ΔH), and entropy (ΔS). The impacts of increasing temperature on adsorption capacity were investigated, and the results indicate that the pseudo-second-order kinetics model could be presented the dynamic adsorption data that it has. The resultant values for the heat of adsorption and the free energy indicated that adsorption of Flagyl is preferred at low temperatures.

scholarly journals Adsorption Studies of Lead on α- Alumina

1970 ◽  
Vol 44 (4) ◽  
pp. 403-406 ◽  
Author(s):  
Sumra Naeem ◽  
Naseem Zahra ◽  
Uzma Zafar ◽  
Sadia Munawar
Keyword(s):  
Atomic Absorption ◽  
Toxic Metals ◽  
Contact Time ◽  
Batch Adsorption ◽  
Lead Removal ◽  
Solution System ◽  
Freundlich Equation ◽  
Adsorption Data ◽  
C 30 ◽  
Alpha Alumina

The presence of toxic metals like lead, mercury, chromium, arsenic, etc. in water is major problem these days. This investigation involves the removal of lead from water by batch adsorption technique using α- alumina (A12O3) as adsorbent. Percentage adsorption was determined for alumina-lead solution system as a function of pH, temperature, contact time and adsorbate dose. The known quantities of lead in solutions have been adsorbed on α-alumina and the concentration of lead in the solution after adsorption was determined by atomic absorption spectrophotometer. Maximum adsorption of lead was observed at pH 10, temp.15°C, 30 minutes and low adsorbate dose. Adsorption data has been interpreted in terms of Freundlich equation. The results suggest that α-alumina is effective adsorbent for lead removal. Key words: Toxic metals; Adsorbent; α-Alumina DOI: 10.3329/bjsir.v44i4.4589 Bangladesh J. Sci. Ind. Res. 44(4), 403-406, 2009

scholarly journals PENGARUH pH LARUTAN DAN UKURAN PARTIKEL ABU SEKAM PADI TERHADAP PENURUNAN KADAR CONGO RED

Molekul ◽  
2007 ◽  
Vol 2 (1) ◽  
pp. 7
Author(s):  
Tien Setyaningtyas ◽  
Uyi Sulaeman
Keyword(s):  
Particle Size ◽  
Rice Husk ◽  
Congo Red ◽  
Contact Time ◽  
Adsorption Process ◽  
Rice Husk Ash ◽  
Raw Material ◽  
Particle Sizes

Rice husk used as a raw material to produce the rice husk ash. The purpose of this research were to determine the optimum contact time and maximum pH of congo red adsorption by rice husk ash, to find out the influence of particle size to adsorption The rice husk was washed, then soaked in HCl 3.84 M to remove mineral impurities, and it was dried and heated for four hours at the temperature 6000 C. The yield gained from this research is 23.44%. Optimum contact time started at after five minutes and maximum pH is six for the tree mention particle sizes 50, 100 and 140 mesh. Particle size didn’t give any significant effect to adsorption process with percent decreasing of congo red is 84.97 %, 90.39 %, 89.32 % respectively.

scholarly journals Kinetics and Thermodynamics Studies of Copper(II) Adsorption onto Activated Carbon Prepared from Salacca zalacca Peel

Molekul ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 63
Author(s):  
Dewi Yuanita Lestari ◽  
Endang Widjajanti Laksono
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Metal Ion ◽  
Adsorption Process ◽  
Biogenic Carbon ◽  
Adsorption Data ◽  
Batch Technique ◽  
Langmuir Isotherm Model ◽  
G Value ◽  
Highly Porous

Highly porous and stable materials, such as alumina, silica, carbon, zeolite, and bentonite,  are well known and have been used as metal ion adsorbents. However, the use of biogenic carbon as adsorbent is relatively rare. The adsorption of copper(II) onto activated carbon extracted from Salcaca zalacca peel was studied. The effect of initial copper concentration, contact time, and a series temperature was studied. Adsorption was carried out in a batch technique. The adsorption equilibrium was reached after 60 minutes of contact time. The adsorption data had a better fitting line for the Langmuir isotherm model. The Langergren and also Ho and Mc Kay equations were used to predict the adsorption kinetics. The adsorption process obeyed a second-order kinetics model. The Thermodynamic parameters were ∆H°= -42.4180 kJ/mol; ∆S°= -0.0843 kJ/mol; ∆G°<0. These values indicated that the adsorption was exothermic and spontaneous. The low ∆G° value revealed that the main mechanism controlling the adsorption process was physisorption.

scholarly journals Moringa-functionalized rice husk ash adsorbent for the removal of amoxicillin in aqueous solution

2019 ◽  
Vol 268 ◽  
pp. 01005 ◽  
Author(s):  
Maria Patrichia Oliva ◽  
Clinton Corral ◽  
Michael Jesoro ◽  
John Raymond Barajas
Keyword(s):  
Aqueous Solution ◽  
Rice Husk ◽  
Low Income ◽  
Contact Time ◽  
Rice Husk Ash ◽  
Aqueous Media ◽  
Drug Resistant ◽  
Practical Solution ◽  
Significant Difference ◽  
Treatment Facilities

Lack of stringent policies requiring water treatment facilities to combat occurrence of residual antibiotics in effluents critically impairs the resiliency of low-income communities to drug-resistant pathogens. In an attempt to mitigate the effects of residual drugs in aqueous media, we investigate the extent to which rice husk ash (RHA) functionalized by Moringaoleifera protein (MOP) sequestrates amoxicillin in solution. A semi-factorial design was implemented to evaluate the influence of initial amoxicillin concentration, initial MOP functionalized RHA dosage, and contact time on the removal on amoxicillin in water. Results of our experiments have shown that MOP functionalization enhanced RHA by doubling its rate to sequestrate amoxicillin molecules in solution. This strongly indicated that MOP adhered on the surface of RHA significantly improved its capacity to remove amoxicillin contamination in aqueous solution. Statistical analysis employed further supported our results by implying a significant difference between the performance of MOP-functionalized and bare RHA. In conclusion, our results strongly suggest that MOP functionalization can be a potential practical solution to alleviate the vulnerability of communities to emerging antibiotic pollution.

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