Fixed - bed Column Adsorption Studies Using Synthetic Hydroxyapatite for Pb(II) Removal from Aqueous Solutions

In the present paper, the adsorptive Pb(II) removal from synthetic aqueous solutions using a 2 cm diameter hydroxyapatite column has been studied through column adsorption experiments by varying column depths (1, 2, 3, 4 cm) and flow rate (10, 15, 22.5 mL/min). Different types of synthetic hydroxiapatites have been involved in experiments. Column design parameters such as critical bed depth and adsorption capacity have been determined from experimental studies. The results revealed the effectiveness of synthetic hydroxyapatite porous beads in Pb(II) removal from aqueous synthetic solutions.

Download Full-text

Adsorption of chloro-anilines from solution by modified peanut husk in fixed-bed column

Water Science & Technology ◽

10.2166/wst.2013.464 ◽

2013 ◽

Vol 68 (10) ◽

pp. 2158-2163 ◽

Cited By ~ 2

Author(s):

Shenglong Zhang ◽

Randi Zhang ◽

Wei Xiao ◽

Runping Han

Keyword(s):

Flow Rate ◽

Low Cost ◽

Fixed Bed ◽

Breakthrough Curves ◽

Ammonium Bromide ◽

Spectroscopy Analysis ◽

Time Model ◽

Fixed Bed Column ◽

Column Adsorption ◽

Critical Bed Depth

Natural peanut husk (NPH) modified with hexadecyl trimethyl ammonium bromide (CTAB) was used as adsorbent to remove 2,5-dimethoxy-4-chloroaniline (DMCH) from solution in a fixed-bed column. Fourier transform infrared spectroscopy analysis and X-ray fluorescence of NPH and modified peanut husk (MPH) showed that CTAB had been introduced onto the surface of NPH. The effects of flow rate and bed depth on breakthrough curves were studied. The Thomas model and the Yan model were selected to fit the column adsorption data and the results showed that the Yan model was better at predicting the breakthrough curves. The adsorption quantity was up to 6.46 mg/g according to the Yan model. The bed depth service time model was used to calculate the critical bed depth from experimental data and it was directly related to flow rate. As a low-cost adsorbent, MPH is promising for the removal of DMCH from solution.

Download Full-text

Fixed Bed Column Filled with Rice Husk for the Removal of Cu (II) from Aqueous Solution

Materials Science Forum ◽

10.4028/www.scientific.net/msf.658.53 ◽

2010 ◽

Vol 658 ◽

pp. 53-56

Author(s):

Zai Fang Deng ◽

Xue Gang Luo ◽

Xiao Yan Lin

Keyword(s):

Aqueous Solution ◽

Rice Husk ◽

Flow Rate ◽

Low Cost ◽

Fixed Bed ◽

Design Parameters ◽

Breakthrough Time ◽

Fixed Bed Column ◽

Initial Concentration ◽

Column Design

The performance of low-cost adsorbent such as rice husk fixed bed column in removing copper from aqueous solution were studied in this work. Different column design parameters like bed height, flow rate and initial concentration were calculated. It was found that at 10 mg/L concentration of Cu (Ⅱ) and at flow rate 5 mL/min with different bed depths such as 9, 12 and 15 cm, the breakthrough time increases from 150 to 260 min; the breakthrough time increases from 125 to 780 min with decreasing of flow rate from 15 to 5 mL/min and decreased from 260 to 50 min when initial concentration increased from 7 to 50 mg/L.

Download Full-text

Fixed-Bed Column Study for Zn (II) Removal from Solution Using Raw Rice Husk

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.197-198.234 ◽

2011 ◽

Vol 197-198 ◽

pp. 234-237

Author(s):

Zai Fang Deng ◽

Xue Gang Luo ◽

Xiao Yan Lin

Keyword(s):

Rice Husk ◽

Flow Rate ◽

Adsorption Process ◽

Fixed Bed ◽

Design Parameters ◽

Column Studies ◽

Fixed Bed Column ◽

Initial Concentration ◽

Column Design ◽

Bed Depth Service Time

A ﬁxed bed of raw rice husk was used for the removal of Zn (II) from aqueous solution. The material as adopted was found to be an efficient media for the removal of Zn (II) in continuous mode using ﬁxed bed column. Different column design parameters like depth of exchange zone, flow rate and initial concentration were calculated. When conducted with Zn (II) concentration 10 mg.L-1 and flow rate 10 ml.min-1 with different bed depths such as 3, 6 and 9 cm, the equilibrium uptake was 3.366, 2.847 and 2.764 mg.g-1, respectively. The equilibrium uptake decreased from 2.802 to 1.975 mg.g-1 with increasing of flow rate from 5 to 15 mL.min-1 and increased from 2.764 to 3.798 mg.g-1 when initial concentration increased from 10 to 30 mg.L-1. The dynamics of adsorption process was modeled by bed depth service time (BDST), and indicating the validity of BDST model when applied to the continuous column studies.

Download Full-text

Fixed-Bed Column Study for Zn (II) Removal from Solution Using Expanding Rice Husk

Materials Science Forum ◽

10.4028/www.scientific.net/msf.695.29 ◽

2011 ◽

Vol 695 ◽

pp. 29-32

Author(s):

Zai Fang Deng ◽

Xue Gang Luo ◽

Xiao Yan Lin

Keyword(s):

Rice Husk ◽

Flow Rate ◽

Adsorption Process ◽

Fixed Bed ◽

Design Parameters ◽

Column Studies ◽

Fixed Bed Column ◽

Initial Concentration ◽

Bed Height ◽

Column Design

The performance of expanding rice husk (ERH) fixed bed column in removing Zn (II) from aqueous solution were studied in this work. Different column design parameters like bed height, flow rate and initial concentration were calculated. It was found that ERH was found to be an effective adsorbent for removal of Zn (II); and when conducted with Zn (II) concentration 12.8 mg L-1and flow rate 10 ml min-1with different bed depths such as 3, 6 and 9 cm, the equilibrium uptake was decreased from 5.181 to 4.33 mg g-1; the equilibrium uptake also decreased from 4.51 to 3.807 mg g-1with increasing of flow rate from 5 to 15 ml min-1and increased from 4.447 to 5.752 mg g-1when initial concentration increased from 12.8 to 35 mg L-1. The dynamics of adsorption process was modeled by bed depth service time (BDST), and indicating the validity of BDST model when applied to the continuous column studies.

Download Full-text