Conversion of coconut waste into cost effective adsorbent for Cu(II) and Ni(II) removal from aqueous solutions

Desiccated coconut waste (DCW) is an agricultural waste that originates from the coconut milk processing industry. In this study, it was utilized for the removal of copper (Cu(II)) and nickel (Ni(II)) via adsorption process. The physicochemical characterization of the DCW adsorbent shows that the adsorbent have a surface area of 6.63 m<sup>2</sup>/g, have high elemental carbon content and existences of important functional groups on its surface. The adsorptive capability of DCW adsorbent in removing the heavy metal were conducted in batch studies. DCW adsorbent performed highest Ni(II) and Cu(II) adsorption capacity at pH 6, where equilibrium is achieved at 450 minutes. The kinetic analysis showed the adsorption agreed with pseudo-second order kinetic model, indicating the Cu(II) and Ni(II) adsorption were a chemical adsorption, limited by the film diffusion. The DCW adsorbent still retained its effective adsorption capacity after 2 adsorption-desorption cycles, which is one of the excellent criteria of a good adsorbent for an adsorption process.

Download Full-text

Preparation of bio-absorbents by modifying licorice residue via chemical methods and removal of copper ions from wastewater

Water Science & Technology ◽

10.2166/wst.2021.463 ◽

2021 ◽

Author(s):

Xiaochun Yin ◽

Nadi Zhang ◽

Meixia Du ◽

Hai Zhu ◽

Ting Ke

Keyword(s):

Adsorption Capacity ◽

Copper Ions ◽

Order Kinetic ◽

Solution Ph ◽

Chemical Methods ◽

Simple Strategy ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Surface Active ◽

Adsorption Desorption

Abstract In this paper, a series of bio-adsorbents (LR-NaOH, LR-Na2CO3 and LR-CA) were successfully prepared by modifying Licorice Residue with NaOH, Na2CO3 and citric acid, which were used as the adsorbents to remove Cu2+ from wastewater. The morphology and structure of bio-adsorbents were characterized by Fourier Transform Infrared, SEM, TG and XRD. Using static adsorption experiments, the effects of the adsorbent dosage, the solution pH, the adsorption time, and the initial Cu2+ concentration on the adsorption performance of the adsorbents were investigated. The results showed that the adsorption process of Cu2+ by the bio-adsorbents can be described by pseudo-second order kinetic model and the Langmuir model. The surface structure of the LR-NaOH, LR-Na2CO3 and LR-CA changed obviously, and the surface-active groups increased. The adsorption capacity of raw LR was 21.56 mg/g, LR-NaOH, LR- Na2CO3 significantly enhanced this value up to 43.65 mg/g, 43.55 mg/g, respectively. After four adsorption-desorption processes, the adsorption capacity of LR-NaOH also maintained about 73%. Therefore, LR-NaOH would be a promising adsorbent for removing Cu2+ from wastewater, and the simple strategy towards preparation of adsorbent from the waste residue can be as a potential approach using in the water treatment.

Download Full-text

Characterization of Durian Seed Starch/PVOH Composite Hydrogel as a Potential Adsorbent for Removal of Hazardous Dyes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.931-932.286 ◽

2014 ◽

Vol 931-932 ◽

pp. 286-290 ◽

Cited By ~ 2

Author(s):

W. Pimpa ◽

C. Pimpa

Keyword(s):

Adsorption Capacity ◽

Synthetic Dyes ◽

Order Kinetic ◽

Solution Ph ◽

Environment Friendly ◽

Composite Hydrogels ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Durian Seed

The intention of this study was to prepare the environment friendly durian seed starch/polyvinyl alcohol (DSS/PVOH) composite hydrogels modified by chemical cross-linking with glutaraldehyde and to assess the adsorption potential of the DSS/PVOH composite hydrogels for the removal of the synthetic dyes from aqueous solution. The hydrogels were characterized by swelling behavior and scanning electron microscope (SEM). The effect of DSS content and initial dye solution pH on the adsorption capacity was studied conducting batch experiment system. The DSS/PVOH composite hydrogels consisting 3% DSS has optimum adsorption capacity of 3.411 mg/g (for methylene blue under the condition of pH 7) and 3.274 mg/g (for acid orange 8 under the condition of pH 2.5) at 24 h of contact time. The adsorptions were well fitted by the pseudo-second order kinetic model. It was indicated that the mechanism of removal predominant is effective for low dye concentrations, below 10 mg/l.

Download Full-text

Preparation and Characterization of a Novel Amidoxime-Modified Polyacrylonitrile/Fly Ash Composite Adsorbent and Its Application to Metal Wastewater Treatment

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph19020856 ◽

2022 ◽

Vol 19 (2) ◽

pp. 856

Author(s):

Yan Sun ◽

Xiaojun Song ◽

Jing Ma ◽

Haochen Yu ◽

Gangjun Liu ◽

...

Keyword(s):

Fly Ash ◽

Adsorption Process ◽

Single Layer ◽

Nitrogen Adsorption ◽

Order Kinetic ◽

X Ray Diffraction ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

High Degree

The polyacrylonitrile/fly ash composite was synthesized through solution polymerization and was modified with NH2OH·HCl. The amidoxime-modified polyacrylonitrile/fly ash composite demonstrated excellent adsorption capacity for Zn2+ in an aqueous medium. Fourier transform-Infrared spectroscopy, thermogravimetric analysis, nitrogen adsorption, X-ray diffraction, and scanning electron microscopy were used to characterize the prepared materials. The results showed that the resulting amidoxime-modified polyacrylonitrile/fly ash composite was able to effectively remove Zn2+ at pH 4–6. Adsorption of Zn2+ was hindered by the coexisting cations. The adsorption kinetics of Zn2+ by Zn2+ followed the pseudo-second order kinetic model. The adsorption process also satisfactorily fit the Langmuir model, and the adsorption process was mainly single layer. The Gibbs free energy ΔG0, ΔH0, and ΔS0 were negative, indicating the adsorption was a spontaneous, exothermic, and high degree of order in solution system.

Download Full-text

Removal of Malachite Green using Green Synthesized α-MnO2 nanoparticles: Kinetics, Intraparticle Diffusion and Isotherm

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.a9242.119119 ◽

2019 ◽

Vol 9 (1) ◽

pp. 5255-5258

Keyword(s):

Malachite Green ◽

Adsorption Process ◽

Cost Effective ◽

Intraparticle Diffusion ◽

Order Kinetic ◽

Environment Friendly ◽

Mno2 Nanoparticles ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Best Fit

This study helps to understand the adsorption of Malachite Green (MG) on α-MnO2 nanoparticles which was green synthesized using sugarcane juice. Different parameters including pH of solution, dosage of adsorbent, concentration of pollutant and time for adsorption process was studied to conclude the efficacy of the process using the adsorbent. The isotherm and kinetics for adsorption of MG concluded that Langmiur isotherm and pseudo second order kinetic model yields the best fit. The maximum monolayer sorption according to Langmiur was found to be 300.03 mg/g. So, α-MnO2 nanoparticles prove to be a cost effective, environment friendly and easily available 3D adsorbent.

Download Full-text

Preparation of novel porous Al2O3-SiO2 nanocomposites via solution-freeze-drying-calcination method for the efficient removal of uranium in solution

Nanotechnology ◽

10.1088/1361-6528/ac3c7a ◽

2021 ◽

Author(s):

Maoling Wu ◽

Ling Ding ◽

Jun Liao ◽

Yong Zhang ◽

Wenkun Zhu

Keyword(s):

Adsorption Process ◽

Interaction Mechanism ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Order Kinetic Model ◽

Langmuir Isotherm Model ◽

Pseudo Second Order ◽

Calcination Method ◽

Adsorption Desorption

Abstract In this work, the efficient extraction of uranium in solution using Al2O3-SiO2-T was reported. Kinetics and isotherm models indicated that the removal process of uranium onAl2O3-SiO2-T accorded with pseudo-second-order kinetic model and Langmuir isotherm model, which showed that the adsorption process was a uniform mono-layer chemical behavior. The maximum adsorption capacity of Al2O3-SiO2-T reached 738.7 mg g-1, which was higher than AlNaO6Si2 (349.8 mg g-1) and Al2O3-SiO2-NT (453.1 mg g-1), indicating that the addition of template could effectively improve the adsorption performance of Al2O3-SiO2 to uranium. Even after five cycles of adsorption-desorption, the removal percentage of uranium on Al2O3-SiO2-T remained 96%. Besides, the extraction efficiency of uranium on Al2O3-SiO2-T was 72.5% in simulated seawater, which suggested that the Al2O3-SiO2-T was expected to be used for uranium extraction from seawater. Further, the interaction mechanism between Al2O3-SiO2-T and uranium species was studied. The results showed that the electrostatic interaction and complexation played key roles in the adsorption process of Al2O3-SiO2-T to uranium.

Download Full-text

Ethylenediamine and Pentaethylene Hexamine Modified Bamboo Sawdust by Radiation Grafting and Their Adsorption Behavior for Phosphate

Applied Sciences ◽

10.3390/app11177854 ◽

2021 ◽

Vol 11 (17) ◽

pp. 7854

Author(s):

Jifu Du ◽

Houhua Xiong ◽

Zhen Dong ◽

Xin Yang ◽

Long Zhao ◽

...

Keyword(s):

Adsorption Capacity ◽

Natural Waters ◽

Phosphate Removal ◽

Order Kinetic ◽

Ring Opening Reaction ◽

Order Kinetic Model ◽

Langmuir Isotherm Model ◽

Radiation Induced ◽

Pseudo Second Order ◽

Adsorption Desorption

Phosphate is an important component for the growth of plants and microorganisms; however, excess phosphate causes serious eutrophication in natural waters. New potential low-loss adsorbents from natural biomass for phosphate removal are desired. Bamboo is one of the most abundant renewable cellulose resources; however, the pure bamboo cellulose is poor to adsorb phosphate. To enhance the adsorption capacity, in this work, bamboo sawdust (BS) was chemically modified by two kinds of amines. First, glycidyl methacrylate (GMA) was grafted on BS using radiation induced graft polymerization. Then, the GMA-grafted BS was further modified by a ring-opening reaction with amines, including ethylenediamine (EDA) and pentaethylene hexamine (PEHA). The amine groups were then quaternized to prepare the BS-GMA-EDA-Q and BS-GMA-PEHA-Q adsorbents. The adsorbents were characterized by FTIR, SEM, TG, and XPS analysis. The adsorption performances of the adsorbents for phosphate were evaluated through batch experiments. The adsorption by BS-GMA-EDA-Q and BS-GMA-PEHA-Q both well obeyed the pseudo-second-order kinetic model and the Langmuir isotherm model, indicating that the adsorption process was chemical monomolecular layer adsorption. The maximum adsorption capacities for BS-GMA-EDA-Q and BS-GMA-PEHA-Q calculated by the Langmuir model were 85.25 and 152.21 mg/g, respectively. A total of 1 mol/L HCl was used to elute the saturated adsorbents. A negligible decrease in adsorption capacity was found after five adsorption–desorption cycles.

Download Full-text

Adsorption-Desorption Profile of Methylene Blue Dye on Raw and Acid Activated Kaolinite

Indonesian Journal of Chemistry ◽

10.22146/ijc.43552 ◽

2020 ◽

Vol 20 (4) ◽

pp. 755

Author(s):

Nurul Ain Safiqah Md Sandollah ◽

Sheikh Ahmad Izaddin Sheikh Mohd Ghazali ◽

Wan Nazihah Wan Ibrahim ◽

Ruhaida Rusmin

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Cost Effective ◽

Blue Dye ◽

Order Kinetic ◽

Kaolinite Clay ◽

Freundlich Model ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Adsorption Desorption

The efficiencies of raw (RK) and acid activated (0.5 M AAK) kaolinite clay minerals to remove methylene blue (MB) dyes in aqueous solution were investigated and compared. The 0.5 M AAK was prepared by treatment of RK in dilute 0.5 M HCl aqueous solution under reflux. Kaolinite adsorbents were characterized and their MB removal performances were evaluated via the batch method. MB desorption from spent kaolinites was investigated at pH 4 to 8. The MB removal was increased with increasing initial dye concentration, agitation speed and adsorbent dosage in 60 min reaction time at pH 6. Both kaolinites showed high MB removal (up to 97%). The Freundlich model has the best-fit equilibrium adsorption isotherm model for RK and 0.5 M AAK. The kinetic data for both adsorbents showed strong agreement with the pseudo second order kinetic model (r2 > 0.98). Nevertheless, the spent RK adsorbent demonstrated a significant higher MB retention than 0.5 M AAK in desorption experiments. Kaolinite clays have great potential as cost-effective materials for dyes removal in wastewater treatment.

Download Full-text

Development and Adsorption Characterization of Metal Affinity-Immobilized Magnetic Liposome

Journal of Nanomaterials ◽

10.1155/2020/8731360 ◽

2020 ◽

Vol 2020 ◽

pp. 1-8

Author(s):

Yuan Lu ◽

Dankui Liao ◽

Xuezhen Feng ◽

Hualin Meng ◽

Yuting Lu ◽

...

Keyword(s):

Adsorption Process ◽

Intraparticle Diffusion ◽

Order Kinetic ◽

Intraparticle Diffusion Model ◽

First Order ◽

Metal Affinity ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Antihypertensive Peptides

A metal affinity-immobilized magnetic liposome (MA-IML) was prepared in this research, which was with lipid and Ni2+ content of 143.25 μg/mg and 32 μmol/mg, respectively. The antihypertensive peptides Ile-Pro-Pro (IPP) and Val-Pro-Pro (VPP) could be adsorbed onto MA-IML under specific conditions, and the adsorption kinetics was explored. The pseudo-second-order kinetics (R2 value>0.98) was more suitable to describe the adsorption process of IPP and VPP than the intraparticle diffusion model and pseudo-first-order kinetic model. The results indicated that MA-IML could be used as an adsorbent for screening antihypertensive peptides from natural products.

Download Full-text

Adsorption Studies on the Removal of Textile Effluent over Two Natural Eco-Friendly Adsorbents

Journal of Chemistry ◽

10.1155/2020/6457825 ◽

2020 ◽

Vol 2020 ◽

pp. 1-13 ◽

Cited By ~ 1

Author(s):

Ouissal Assila ◽

Karim Tanji ◽

Morad Zouheir ◽

Abdellah Arrahli ◽

Loubna Nahali ◽

...

Keyword(s):

Adsorption Process ◽

Oxygen Demand ◽

Textile Wastewater ◽

Cost Effective ◽

Operating Conditions ◽

Order Kinetic ◽

X Ray ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Wastewater Samples

This study investigates the possibility of applying an adsorption process using two abundant natural minerals M1 and M2. Without pretreatment or activation, the adsorbents were used to treat real textile wastewater samples (collected from Fez city, Morocco). As a cost-effective alternative, these materials were characterized by different analyses, including X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray fluorescence (XRF). Chemical oxygen demand (COD) and biological oxygen demand (BOD) were used to characterize the textile wastewater. Additionally, the influence of operating conditions (contact time, adsorbent dosages, and pH) was evaluated. Results show that the adsorption process takes place quickly, reaching the equilibrium at 90 and 160 min for M1 (88% COD) and M2 (79% COD). Both materials show a higher affinity to Cr (39%) and lower affinity to Cu (28%). A pseudo-second-order kinetic model provides the best fit to the experimental adsorption data. Germination tests indicate a low toxicity after the adsorption process. Performance of both materials was compared with that of other literature studies.

Download Full-text

Adsorption Kinetics of Pb(II), Cd(II), Zn(II) and Fe(III) onto Saponified Apple Waste

Journal of Nepal Chemical Society ◽

10.3126/jncs.v23i0.2103 ◽

1970 ◽

Vol 23 ◽

pp. 102-105 ◽

Cited By ~ 4

Author(s):

Puspa Lal Homagai ◽

Hari Paudyal

Keyword(s):

Adsorption Capacity ◽

Adsorption Process ◽

Chemical Society ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Order Kinetic Model ◽

Wet Condition ◽

Pseudo Second Order ◽

Kinetics Of ◽

Optimal Ph

Saponified apple waste gel was prepared in wet condition with calcium hydroxide at highly alkaline medium. The effect of initial concentration, contact time and pH of the solution was investigated. The maximum adsorption capacity onto this adsorbent was investigated for Fe(III), Cd(II), Zn(II) and Pb(II) at their optimal pH of 3, 6, 4.5 and 3.5 respectively. Langmuir isotherm and pseudo second-order kinetic model gave better explanation of the adsorption process. For binary mixture of Zn(II) and Cd(II), the separation factor and effect on adsorption capacity for both the metals were investigated.Keywords: adsorption, saponified apple waste, bioadsorption.DOI: 10.3126/jncs.v23i0.2103Journal of Nepal Chemical Society, Vol. 23, 2008/2009 Page: 102-105

Download Full-text