Copper removal by polymer immobilised Rhizopus oryzae

2000 ◽  
Vol 42 (7-8) ◽  
pp. 345-352 ◽  
Author(s):  
M. S. Al-Hakawati ◽  
C. J. Banks
Keyword(s):  
Adsorption Capacity ◽  
Room Temperature ◽  
Shake Flask ◽  
Rhizopus Oryzae ◽  
Polymer Matrices ◽  
Copper Uptake ◽  
Uptake Capacity ◽  
Copper Adsorption ◽  
Copper Solution ◽  
Erroneous Result

Rhizopus oryzae, strain IMI 057412, was immobilised by inclusion in six different polymers: polyvinlformal, polysulfone, polyurethane, alginate, polyacrylamide, k-carrageenan, polyethyleneimine(PEI). It was also grown on a seventh, polyurethane. The biomass/polymer matrices were formed into equal size units (4 mm spheres or cubes) and the resulting biomass/polymer matrices were used to uptake copper at 2 mg/l from a laboratory-formulated copper solution in shake flask experiments at room temperature and initially neutral pH. Results showed that the copper uptake capacity of immobilised biomass was either equal to or less than that of free biomass. Biomass immobilised in polyurethane gave a capacity equal to that of free biomass, while other matrices hindered the uptake to different degrees. The k-carrageenan matrix proved to be unstable in the copper solution and dissolved during the experiment releasing the biomass and leading to an erroneous result. The polymer matrices without biomass, with theexception of alginate and polysulfone, showed no measurable copper adsorption capacity. All the experiments were conducted in duplicate with a maximum variation between them of 7%.

A polyether amine modified metal organic framework enhanced the CO2 adsorption capacity of room temperature porous liquids

2019 ◽  
Vol 55 (87) ◽  
pp. 13179-13182 ◽  
Author(s):  
Xuemei Zhao ◽  
Yihui Yuan ◽  
Peipei Li ◽  
Zenjun Song ◽  
Chunxin Ma ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Room Temperature ◽  
Co2 Adsorption ◽  
Metal Organic Framework ◽  
Uptake Capacity ◽  
Metal Organic ◽  
Co2 Adsorption Capacity ◽  
Organic Framework

A room-temperature MOF-based porous liquid was prepared and showed an outstanding CO2 uptake capacity.

scholarly journals Ultrasound assisted chemical activation of peanut husk for copper removal

2019 ◽  
Vol 8 (1) ◽  
pp. 46-53
Author(s):  
Pradnya K. Ingle ◽  
Karishma Attarkar ◽  
Virendra K. Rathod
Keyword(s):  
Phosphoric Acid ◽  
Chemical Activation ◽  
Activation Process ◽  
Sonication Time ◽  
Copper Uptake ◽  
Uptake Capacity ◽  
Copper Adsorption ◽  
Impregnation Ratio ◽  
Ultrasound Assisted ◽  
Phosphoric Acid Concentration

Abstract The ultrasound assisted chemical activation of peanut husk using phosphoric acid was studied at a frequency of 20 kHz. Experiments were carried out for the activation of peanut husk in presence of ultrasound followed by the study of consequent effect on the adsorption behavior of copper. Effect of sonication during chemical activation on copper adsorption was studied with respect to various parameters such phosphoric acid concentration, acid impregnation ratio, temperature, duty cycle, sonication time, power and the probe height dipped in the adsorbent-acid slurry. Results showed that after the application of ultrasound during the activation process, copper uptake capacity of the adsorbent is improved with increasing ultrasound power and the activation process is more feasible at 30°C. The copper uptake after activation treatment of 5 min in the presence of ultrasound was found to be 19.6 mg/g as against 17.8 mg/g by conventional chemical activation method performed for 20 min. Thus, after acid treatment in the presence of ultrasound, the adsorbent shows a good adsorption capacity at lower time of chemical activation.

Evaluation of two types of polyurethane for the immobilisation of Rhizopus oryzae for copper uptake

2003 ◽  
Vol 47 (9) ◽  
pp. 143-150 ◽  
Author(s):  
M.S. Alhakawati ◽  
C.J. Banks ◽  
D. Smallman
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Polyurethane Foam ◽  
Rhizopus Oryzae ◽  
Porous Matrix ◽  
Adsorptive Capacity ◽  
High Concentration ◽  
Solution Ph ◽  
Copper Adsorption ◽  
The Matrix

Previous studies have shown that Rhizopus oryzae strain IM 057412 grown in reticulated polyurethane foam demonstrated the same heavy metal adsorption capacity as the free biomass. Immobilisation in other types of polymers was shown to reduce the biomass uptake capacity because of mass transfer limitations due to the restricted porosity of the immobilisation matrices. For practical purposes the growing of biomass in polyurethane support particles to use as a commercial adsorbent is not viable or financially sound. The current work describes a different approach in which dried non-viable cells of R. Oryzae were incorporated into two types of polyurethane carrier matrix during the production process. The polymers used were a conventional hydrophobic polyurethane and a hydrophilic polyurethane, Hypol 2002. Oven-dried and powdered particles (D<150 μm) of R. oryazea were immobilised by mixing the biomass with each of the polymers prior to the reaction in which the polymer was expanded to form a foam: consequently the biomass was uniformly dispersed throughout the porous matrix. The resulting fungi-polyurethane matrices were then cut into cubes (≡4-5 mm dimension) and their adsorptive properties studied with respect to copper. Experiments were conducted in shake flasks to establish the equilibrium time for the reaction for both free and immobilised biomass. The biomass immobilised in Hypol gave the same adsorptive capacity as that of free biomass when compared on a weight basis, but biomass immobilised in conventional polyurethane foam showed no adsorption. To assess fully the effect of pH on copper and to eliminate precipitation as a removal mechanism experiments were conducted at different pHs and different copper concentrations. In each case the solution pH was maintained by acid or base addition in response to measurements using a standard calomel electrode. It was shown that at pH 5 copper concentrations above 100 mg l−1 were likely to precipitate. The amount of precipitation was accounted for within the high concentration adsorption isotherm experiments by using a mass balance approach. Results showed that the adsorption of the Hypol immobilised biomass followed the Langmuir adsorption isotherm model and showed the copper adsorption capacity of the matrix to be between 10 and 13 mg g−1. The copper attached to the immobilised biomass could easily be desorbed by increasing the acidity, allowing the matrix to be used in repetitive sorption-desorption cycles. There was a small decrease in the adsorption capacity after the first desorption cycle that could be explained by a partial loss of biomass as detected by loss of total organic carbon (TOC).

scholarly journals Novel PVDF-PVP Hollow Fiber Membrane Augmented with TiO2 Nanoparticles: Preparation, Characterization and Application for Copper Removal from Leachate

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 399
Author(s):  
Mohammed Umar Abba ◽  
Hasfalina Che Man ◽  
Raba’ah Syahidah Azis ◽  
Aida Isma Idris ◽  
Muhammad Hazwan Hamzah ◽  
...  
Keyword(s):  
Contact Angle ◽  
Adsorption Capacity ◽  
Tio2 Nanoparticles ◽  
Polyvinylidene Fluoride ◽  
Negative Impact ◽  
Hollow Fiber Membrane ◽  
Copper Removal ◽  
Fiber Membrane ◽  
Copper Adsorption ◽  
Phase Inversion Technique

High proportion of copper has become a global challenge owing to its negative impact on the environment and public health complications. The present study focuses on the fabrication of a polyvinylidene fluoride (PVDF)-polyvinyl pyrrolidone (PVP) fiber membrane incorporated with varying loading (0, 0.5, 1.0, 1.5, and 2.0 wt%) of titanium dioxide (TiO2) nanoparticles via phase inversion technique to achieve hydrophilicity along with high selectivity for copper removal. The developed fibers were characterized based on scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), permeability, porosity, zeta potential, and contact angle. The improved membrane (with 1.0 wt% TiO2) concentration recorded the maximum flux (223 L/m2·h) and copper rejection (98.18%). Similarly, 1.0 wt% concentration of TiO2 nanoparticles made the membrane matrix more hydrophilic with the least contact angle of 50.01°. The maximum copper adsorption capacity of 69.68 mg/g was attained at 1.0 wt% TiO2 concentration. The experimental data of adsorption capacity were best fitted to the Freundlich isotherm model with R2 value of 0.99573. The hybrid membrane developed in this study has considerably eliminated copper from leachate and the concentration of copper in the permeate was substantially reduced to 0.044 mg/L, which is below standard discharge threshold.

scholarly journals Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 63
Author(s):  
Maria Harja ◽  
Gabriela Buema ◽  
Nicoleta Lupu ◽  
Horia Chiriac ◽  
Dumitru Daniel Herea ◽  
...  
Keyword(s):  
Fly Ash ◽  
Adsorption Capacity ◽  
Copper Ions ◽  
Synthetic Wastewater ◽  
Bet Surface Area ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Copper Adsorption ◽  
X Ray

Fly ash/magnetite material was used for the adsorption of copper ions from synthetic wastewater. The obtained material was characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET) surface area, and vibrating sample magnetometer (VSM). Batch adsorption experiments were employed in order to investigate the effects of adsorbent dose, initial Cu (II) concentration and contact time over adsorption efficiency. The experimental isotherms were modeled using Langmuir (four types of its linearization), Freundlich, Temkin, and Harkins–Jura isotherm models. The fits of the results are estimated according to the Langmuir isotherm, with a maximum adsorption capacity of 17.39 mg/g. The pseudo-second-order model was able to describe kinetic results. The data obtained throughout the study prove that this novel material represents a potential low-cost adsorbent for copper adsorption with improved adsorption capacity and magnetic separation capability compared with raw fly ash.

Using of Sukary and Khlass Date Pits as a Bio-adsorbents for Adsorption of Lead and Copper Ions from Waste Water

2021 ◽  
Vol 37 (2) ◽  
pp. 302-307
Author(s):  
Abdulrahman G. Alhamzan
Keyword(s):  
Adsorption Capacity ◽  
Room Temperature ◽  
Copper Ions ◽  
Phoenix Dactylifera ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Palm Trees ◽  
Phoenix Dactylifera L ◽  
Temperature Equilibrium ◽  
Date Pits

In this study date pits of two types of date-palm trees (Phoenix Dactylifera L.), in Saudi Arabia were used as bio-sorbents for heavy metals (e.g. lead and copper) from aqueous solutions. Investigation of equilibrium time and the effect of different concentrations of metals were performed. Adsorption capacity of bio-sorbents increased when increasing concentration of metal ions. Maximum adsorption capacity at room temperature of Sukary date pits was 17.53 mg g-1 and 9.86 mg g-1 for lead and copper ions, respectively. Whereas, Khlass date pits showed maximum adsorption capacity at 14.1 mg g-1 and 7.91 mg g-1 for lead and copper ions, respectively at room temperature. Equilibrium isotherm models, (Langmuir and Freundlich models), were used for analysis of equilibrium experimental results. these models describe the experimental data well.

Hydrogen Sulfide Separation from Biogas Using Laterite Soil Adsorbent

2020 ◽  
Vol 988 ◽  
pp. 144-150
Author(s):  
Sanggono Adisasmito ◽  
Carolus Borromeus Rasrendra ◽  
M. Qori Alfadhli ◽  
M. Fauzan Al Ghifary
Keyword(s):  
Particle Size ◽  
Adsorption Capacity ◽  
Room Temperature ◽  
Biogas Production ◽  
Separation Process ◽  
High Adsorption ◽  
Laterite Soil ◽  
Adsorption Column ◽  
Bed Height ◽  
High Adsorption Capacity

Biogas production contributes as an alternative renewable energy but its emissions contain sulphuric components which needs to be separated because it can cause damage to the environment. The method used in separation is adsorption with laterite soil because the price is cheap, easy to obtain, and can occur at room temperature. The purpose of this study is to determine the conditions of the adsorbent in the adsorption column which can provide a high adsorption capacity. The separation process is carried out by flowing biogas with a flow rate of 1.5 liters/minute to the adsorption column containing laterite soil. Reducing the particle size of the adsorbent from 6 mesh to 21 mesh will increase the adsorption capacity to 2.13 times, ie from 7.3 to 14.2 mg H2S/g adsorbent. The addition of bed height from 7 cm to 12 cm will increase the adsorption capacity from 6.7 to 7.9 mg H2­S/g adsorbent at 6 mesh particle size. The addition of bed height from 7 cm to 12 cm will increase the adsorption capacity from 13.5 to 15.0 mg H2S/g adsorbent at 21 mesh particle size. The laterite soil adsorbent with a particle size of 21 mesh has the highest adsorption capacity of 15.0 mg H2S/g adsorbent.

Role of Extracellular Components in Microbial Biosorption of Copper and Lead

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2153-2156 ◽  
Author(s):  
A. A. Pradhan ◽  
A. D. Levine
Keyword(s):  
Metal Removal ◽  
Chloride Ions ◽  
Metallic Ions ◽  
Copper Uptake ◽  
Uptake Capacity ◽  
Inhibiting Effect ◽  
Removal Capacity ◽  
Microbial System ◽  
Microbial Systems

Binding of metal ions to extracellular components of microbial systems plays an important role in biosorption processes. Besides pH and temperature, type of anionic system and concentration of the metallic ions are some of the governing factors determining the maximum uptake capacity of the microbial system. Actinomycetes show an ability to selectively scavenge metals from aqueous systems. A biosorption system was tested using a bimetallic solution containing lead and copper. Uptake of Pb was observed to increase with concentration. Chloride ions had an inhibiting effect on the metal removal capacity of the actinomycetes system.

Lifetime-tunable room-temperature phosphorescence of polyaniline carbon dots in adjustable polymer matrices

Nanoscale ◽  
2019 ◽  
Vol 11 (39) ◽  
pp. 18311-18319 ◽  
Author(s):  
Huilin Gou ◽  
Yanfeng Liu ◽  
Guiyang Zhang ◽  
Qiaobo Liao ◽  
Xin Huang ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Room Temperature ◽  
Data Encryption ◽  
Polymer Matrices ◽  
Room Temperature Phosphorescence ◽  
Time Resolved ◽  
Hydrogen Bonded

A series of room-temperature composites were synthesized by embedding polyaniline carbon dots in hydrogen-bonded polymer matrices. Adjustable RTP lifetime are realized, enabling time-resolved anti-counterfeit and data encryption patterns.

Sign in / Sign up

Export Citation Format

Share Document