scholarly journals Cr(VI) Removal from Wastewater by Using Rice Husk Ash (RHA)

2006 ◽  
Vol 6 (1) ◽  
pp. 53
Author(s):  
M. J. Uddin ◽  
M. M.R. Khan ◽  
M S. Iftekhar ◽  
M A Islam
Keyword(s):  
Rice Husk ◽  
Optimum Parameter ◽  
Rice Husk Ash ◽  
Toxic Metal ◽  
Synthetic Wastewater ◽  
Tannery Effluent ◽  
Freundlich Isotherms ◽  
Chromium Vi ◽  
Langmuir And Freundlich Isotherms ◽  
Equilibrium Data

Rice husk ash (RHA) was studied as a potential adsorbent for Chromium (VI)removal from wastewater. RHA was able to remove effectively and economically toxic metal from synthetic wastewater. Experiments were done on the removal of Cr(VI) from dichromate solution which is a form of chromium in tannery effluent. The amount of Cr(VI) adsorption increased with the decrease in pH. The optimum parameter was = 2.0 evaluated at pH and the dose rate of the adsorbent was 5 kg RHNm3. The equilibrium data fit well in both the Langmuir and Freundlich isotherms. The study showed that 89.29 x 10-3kg Cr(VI) could be removed by 1 Kg of RHA. Since rice husk (RH) is available and cheap in Bangladesh, it can be used easily as an appropriate adsorbent to remove more than 95% Cr(VI) from tannery wastewater.

Application of Chitosan Film for the Removal of Triclosan from Aqueous Solutions by Adsorption

2016 ◽  
Vol 675-676 ◽  
pp. 455-458
Author(s):  
Peeyanan Noirod ◽  
Jittapat Lamangthong ◽  
Padarat Ninjiaranai
Keyword(s):  
Aqueous Solutions ◽  
Contact Time ◽  
Chitosan Film ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Acidic Ph ◽  
Adsorption Efficiency ◽  
Freundlich Isotherms ◽  
Langmuir And Freundlich Isotherms ◽  
Equilibrium Data

The aim of this work was to study the adsorption efficiency of chitosan as an adsorbent for triclosan, commercially known as Irgasan, in aqueous solutions. The effects of contact time, pH and temperature were investigated using a batch adsorption technique. Langmuir and Freundlich isotherms were used to analyze the equilibrium data at different absorption conditions. The results showed that the maximum adsorption capacity for chitosan was found in the acidic pH 3 and at a temperature of 65 oC. These results suggested that chitosan can be used as an adsorbent for removal of triclosan from aqueous solutions.

scholarly journals Adsorption of U(VI) from Aqueous Solution onto Hydrotalcite-Like Compounds

2012 ◽  
Vol 9 (2) ◽  
pp. 669-679 ◽  
Author(s):  
Nguyen Van Suc
Keyword(s):  
Adsorption Capacity ◽  
Enthalpy Change ◽  
Time Dependent ◽  
Freundlich Isotherms ◽  
Langmuir And Freundlich Isotherms ◽  
Equilibrium Data ◽  
Endothermic Process ◽  
Ph Range ◽  
Initial Adsorption ◽  
Hydroxide Hydrate

Uranium adsorption by the synthesized compound of magnesium aluminum hydroxide hydrate – layered double hydrotalcite (STH)-like compounds was studied. The calcinated STH was proven to be a highly effective in U(VI) adsorption in pH range from 6.5 to 7. The time dependent experimental data were found to be fit to the pseudo-second-oder model. The equilibrium data have been modeled using Langmuir and Freundlich isotherms. The results showed that both model provide the best correlation with equilibrium data. The highest adsorption capacity, approximated 62.5 mg/g, was observed in the calcinated STH at 500 °C. The positive value of enthalpy change indicated that adsorption reaction of U(VI) on STH was endothermic process. The regeneration experiments of STH using 0.1M Na2CO3solution was successfully demonstrated multiple times without any significant effect on the initial adsorption capacity.

scholarly journals Biosorption of Chromium (VI) Using Rice Husk Ash and Modified Rice Husk Ash

2010 ◽  
Vol 4 (3) ◽  
pp. 244-250 ◽  
Author(s):  
Jureeporn Wongjunda ◽  
Panjai Saueprasea
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Chromium Vi

scholarly journals Adsorption of chromium (VI) ion using zeolite NaA/Fe3O4 composite derived from rice husk ash

2021 ◽  
Vol 947 (1) ◽  
pp. 012012
Author(s):  
Ngo Truong Ngoc Mai ◽  
Nguyen Thi Anh Thu ◽  
Ngo Truong Bao Trang ◽  
Pham Quoc Phu ◽  
Doan Van Hong Thien ◽  
...  
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
Adsorption Parameters ◽  
X Ray ◽  
Chromium Vi ◽  
Zeolite Naa ◽  
Order Kinetic Model

Abstract In this study, zeolite NaA was fabricated from rice husk ash before combining with Fe3O4 to form a magnetic NaA/Fe3O4 composite. NaA/Fe3O4 composite was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX), and Brunauer Emmett Teller (BET). The surface area and the pore size of zeolite NaA/Fe3O4 was 24.11 m2.g−1 and 23.04 Å. In addition, batch adsorption studies were carried out for the removal of chromium (VI) ion in aqueous solution. The effects of adsorption parameters, including pH solution, initial concentration of Cr (VI) ions, mass of adsorbent, and contact time were investigated. The maximum equilibrium adsorption capacity of zeolite NaA and NaA/Fe3O4 was 22.554 mg.g−1 and 13.722 mg.g−1, respectively. The pseudo-first order kinetic model fitted well to the experimental data. The regeneration of the adsorbent was also investigated for three cycles.

A comparative study of chromium(VI) removal using sawdust and eucalyptus bark

2009 ◽  
Vol 9 (4) ◽  
pp. 343-347
Author(s):  
Abhinav Sharma ◽  
Aditya Tulsyan ◽  
Srinivas Motamarri
Keyword(s):  
Comparative Study ◽  
Hexavalent Chromium ◽  
Low Cost ◽  
Industrial Area ◽  
Contaminated Water ◽  
Tannery Effluent ◽  
Freundlich Isotherms ◽  
Chromium Vi ◽  
Experimental Parameters ◽  
Eucalyptus Bark

A comparative study on low cost biological adsorbents such as eucalyptus bark and sawdust has analyzed them for their effectiveness in the removal of hexavalent chromium. Batch experiments were carried out on synthetic solutions mimicking bore water collected from an industrial area contaminated with tannery effluent. The analysis on hexavalent chromium removal was carried out by varying experimental parameters such as pH, dosage and contact time. The study reveals that sawdust works best at pH 3 while eucalyptus shows better results at pH 2. Moreover, the optimum dosages determined for the absorbents were in compliance with the Langmuir and Freundlich isotherms. The study highlights the benefits of eucalyptus bark in purification of Cr(VI) contaminated water supply.

Efficient removal of chromium(VI) from dilute aqueous solutions using agro-industrial residue based on parboiled-rice husk ash

2021 ◽  
pp. 1-15
Author(s):  
Vanessa Schwarstzhaupt Gamboa ◽  
Edilson Valmir Benvenutti ◽  
Éder Júlio Kinast ◽  
Marçal Pires ◽  
Fabiano Perin Gasparin ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Efficient Removal ◽  
Parboiled Rice ◽  
Chromium Vi ◽  
Dilute Aqueous Solutions ◽  
Industrial Residue

scholarly journals Biosorption of Binary Mixtures of Copper and Cobalt by Penicillium brevicompactum

2007 ◽  
Vol 62 (3-4) ◽  
pp. 261-264 ◽  
Author(s):  
Kolishka Tsekova ◽  
Maria Ianis ◽  
Vera Dencheva ◽  
Sonya Ganeva
Keyword(s):  
Binary Mixtures ◽  
Fungal Biomass ◽  
Contact Time ◽  
Copper Ions ◽  
Resting Cells ◽  
Cobalt Ions ◽  
Freundlich Isotherms ◽  
Langmuir And Freundlich Isotherms ◽  
Equilibrium Data ◽  
Penicillium Brevicompactum

Abstract This work reports on a study of the biosorption of copper and cobalt, both singly and in combination (in equimolar concentrations), by the resting cells of Penicillium brevicompactum. Equilibrium batch sorption studies were carried out at 30 °C and pH 5.0 for a contact time of 1 hour to guarantee that equilibrium was reached. The equilibrium data were analyzed using the Langmuir and Freundlich isotherms. The adsorption of binary mixtures of heavy metal solutions on the fungal biomass was found to be of competitive type where the adsorption capacity for any single metal decreased in the presence of the other. The cobalt ions showed a higher affinity for Penicillium brevicompactum than the copper ions.

Sign in / Sign up

Export Citation Format

Share Document