Technology of Modified Orange Peel Adsorption Treatment in Wastewater Containing Zinc

2012 ◽  
Vol 610-613 ◽  
pp. 1540-1545
Author(s):  
Rui Yu Jia ◽  
You Hong Lin ◽  
Wei Zhang
Keyword(s):  
Adsorption Capacity ◽  
Ph Value ◽  
Orange Peel ◽  
Sorption Process ◽  
Optimal Conditions ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Ph Values ◽  
Wide Range ◽  
Adsorption Treatment

Using modified flavedo as the adsorbent , the sorption process of Zn2+Superscript text by modified flavedo in wastewater containing heavymetals was studied. The effects of various factors in Zn2+Superscript text adsorption , such as adsorbtion time , temperature , pH value , initial Zn2+ concentration , and pretreatment,were analyzed. The results showed that the pretreatment of modified raised adsorption capacity , and the adsorption capacity was suitable for wastewater with a wide range of pH values. The rate of removal of Zn2+Superscript text reached 98% when the Zn2+ initial concentration was under 100mg/L. The optimal conditions for Zn2 + adsorptionSuperscript text by Modified orange peel were a wastewater pH value of 5.5 , at 25 °C, an adsorption time of 60 minutes , and a dosage of modacrylic flavedo of 2 g/ L.

Study on Adsorption of Methylene Blue by the Montmorillonite/poly(γ-Glutamic Acid) Composite

2012 ◽  
Vol 554-556 ◽  
pp. 333-338
Author(s):  
Cai Ning Zhang ◽  
Xu Man Wang
Keyword(s):  
Methylene Blue ◽  
Glutamic Acid ◽  
Adsorption Capacity ◽  
Adsorption Mechanism ◽  
Experimental Results ◽  
Methylene Blue Solution ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Ph Values ◽  
Blue Solution

The composite was prepared with montmorillonite (MMT) and poly(γ-glutamic acid) (γ-PGA). Applied the composite as the sorbent, methylene blue as the adsorbate, the influences of the initial concentrations of methylene blue, adsorption time and pH values of the solution on the adsorption capacity of methylene blue by the composite were studied. The experimental results showed that the adsorption capacity of methylene blue by MMT/γ-PGA composite both increased with the increasing of initial concentration of methylene blue and the prolonging of adsorption time, and then approached saturation respectively. The adsorption capacity of methylene blue by MMT/γ-PGA composite increased with the increasing of pH values of methylene blue solution. Meanwhile, the study of adsorption mechanism demonstrated that the adsorption of methylene blue by MMT/γ-PGA composite was Langmuir type, and the adsorption equation wasΓ=0.204c/(1+0.381C).

Study on the Effect of Amphoteric Bagasse Hemicellulose on Heavy Metal Adsorption

2011 ◽  
Vol 399-401 ◽  
pp. 1282-1288 ◽  
Author(s):  
Li Jun Wang ◽  
Xin Liang Liu ◽  
Meng Ling Weng ◽  
Shuang Xi Li ◽  
Fu Sheng Wu ◽  
...  
Keyword(s):  
Linear Model ◽  
Metal Ion ◽  
Ph Value ◽  
Absorption Capacity ◽  
Heavy Metal Adsorption ◽  
Adsorption Dynamics ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Ph Values ◽  
Pseudo Second Order

In this paper, ions i.e. Cu2+, Pb2+and Cd2+ were absorbed by the amphoteric bagasse hemicelluloses, and the influences of pH value, adsorption time and the initial concentration of metal ion have been studied. The results show that the optimal adsorption pH values for Cu2+, Pb2+ and Cd2+ are 6.5, 6.0 and 7.5, respectively. The adsorption capacity to ions Cu2+, Pb2+ and Cd2+ reaches the maximum values when the adsorption time is 180 min. Net adsorption to ions Cu2+, Pb2+ and Cd2+ increases with increasing the initial concentration of the metal ions. Analysis results of adsorption dynamics show that the adsorption of Cu2+, Pb2+ and Cd2+ follows Ho 's Pseudo second-order kinetics linear model. It can be seen from the adsorption isothermal research that absorption of the amphoteric bagasse hemicelluloses to ions Cu2+, Pb2+and Cd2+ can be well described by the Langmuir isotherm linear model. Moreover, the theoretical values of the maximum absorption capacity qmax for ions Cu2+, Pb2+ and Cd2+ were determined to be 21.98 mg/g, 81.97 mg/g and 31.85 mg/g, respectively.

Adsorption of Cesium from Aqueous Solution by Modified Montmorillonite

2013 ◽  
Vol 395-396 ◽  
pp. 591-594
Author(s):  
Si Man Liu ◽  
Yong Zhou Quan
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Influence Factors ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Cesium Ions ◽  
Modified Montmorillonite ◽  
Adsorption Temperature ◽  
As Adsorption

The modified montmorillonite is used to adsorb cesium ions from aqueous solution. The influence factors such as adsorption time, adsorption temperature, adsorption pH, adsorbent dosage and initial concentration was studied in the experiment. The results show the optimum adsorption time is 100 min, the best adsorption temperature is 50 °C, and pH value is 10. When the concentration of cesium ions is 160 mg/L, the adsorption capacity can be up to 9.217 mg/g.

Study on the Effect of Carboxyl Bagasse Hemicellulose on Heavy Metal Adsorption

2011 ◽  
Vol 415-417 ◽  
pp. 1630-1636 ◽  
Author(s):  
Li Jun Wang ◽  
Xin Liang Liu ◽  
Hong Xiang Zhu ◽  
Meng Ling Weng ◽  
Zhou Jun Li ◽  
...  
Keyword(s):  
Linear Model ◽  
Metal Ion ◽  
Ph Value ◽  
Absorption Capacity ◽  
Heavy Metal Adsorption ◽  
Adsorption Dynamics ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Ph Values ◽  
Pseudo Second Order

In this paper, ions i.e. Cu2+, Pb2+and Cd2+ were absorbed by the carboxyl bagasse hemicelluloses, and the influences of pH value, adsorption time and the initial concentration of metal ion have been studied. The results show that the optimal adsorption pH values for Cu2+, Pb2+and Cd2+ are 5.5, 5.5 and 7.5, respectively. The adsorption capacity to ions Cu2+, Pb2+and Cd2+ reaches the maximum values when the adsorption time is 180 min. Net adsorption to ions Cu2+, Pb2+and Cd2+ increases with increasing the initial concentration of the metal ions. Analysis results of adsorption dynamics show that the adsorption of Cu2+, Pb2+and Cd2+ follows Ho 's Pseudo second-order kinetics linear model. It can be seen from the adsorption isothermal research that absorption of the carboxyl bagasse hemicelluloses to ions Cu2+, Pb2+and Cd2+ can be well described by the Langmuir isotherm linear model. Moreover, the theoretical values of the maximum absorption capacity qmax for ions Cu2+, Pb2+and Cd2+ were determined to be 20.28 mg/g, 82.64 mg/g and 30.58 mg/g, respectively.

Experimental Study of Adsorption Treatment of the Arsenic-Containing Rural Drinking Groundwater

2013 ◽  
Vol 295-298 ◽  
pp. 1129-1134
Author(s):  
Jing Liu ◽  
Hua Yang ◽  
Yan Zuo ◽  
Zhi Min Ren ◽  
De Jun Bian
Keyword(s):  
Experimental Study ◽  
Drinking Water ◽  
Room Temperature ◽  
Arsenic Removal ◽  
Ph Value ◽  
Adsorption Method ◽  
Adsorption Time ◽  
Ph Values ◽  
Adsorption Treatment ◽  
Removal Of Arsenic

The arsenic-containing rural drinking groundwater was treated by adsorption method in the paper. It was studied that the varieties and dosages of adsorbents, pH value and adsorption time have an effect on removal of arsenic. The experimental results indicated that the rate of arsenic removal is able to reach 91.39% at room temperature and under the condition of neutral pH values, 2.0 g of zeolite as adsorbent and 1 h of adsorption time. The content of arsenic in the treated drinking groundwater can be up to the current national hygiene standards of rural drinking water (<0.05mg /L).

Performance Research on Aniline Adsorption from Aqueous Solution by Modified Zeolite/EPDM Composite

2012 ◽  
Vol 571 ◽  
pp. 73-76
Author(s):  
Xiu Qi Liu ◽  
He Qin Xing ◽  
Hong Chen ◽  
Jia Tong Liu
Keyword(s):  
Natural Zeolite ◽  
Ph Value ◽  
Removal Rate ◽  
Influential Factors ◽  
Melt Blending ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Ph Values ◽  
The Matrix ◽  
Performance Research

In this study, a new composite was prepared for aniline adsorption by melt blending with EPDM as the matrix and natural zeolite was modified by microwave as the filler. The properties and some influential factors of composite for adsorption of aniline in the solutions were experimentally investigated, such as composite dosage, adsorption time and pH values. The results showed that in the case of the initial concentration of the aniline wastewater was 50mg/L, when the use level of composite was 1 g, pH value was 1, and the oscillating adsorption time was 2 h, the removal rate could be up to 92%.

Adsorption Behavior of L-Histidine on a Novel Spherical Chitosan Adsorbent

2011 ◽  
Vol 236-238 ◽  
pp. 2574-2580
Author(s):  
Ming Hua Liu ◽  
Piao Piao Huang ◽  
Jian Yun Ou
Keyword(s):  
Adsorption Capacity ◽  
Ph Value ◽  
Equilibrium Adsorption ◽  
Solution Ph ◽  
Chitosan Beads ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Temperature ◽  
Equilibrium Adsorption Capacity ◽  
Isothermal Equation

The spherical chitosan adsorbent was prepared by graft copolymerization of acrylic acid onto the cross-linked spherical chitosan beads, and then was adopted to adsorb the L-histidine. The adsorption conditions, i.e., solution pH, adsorption time, initial concentration and adsorption temperature were optimized. The spherical chitosan adsorbent showed excellent equilibrium adsorption capacity of 78.3 mg/g for the L-histidine when the solution pH value was 7.5, adsorption time was 180 min, initial concentration was 1500 mg/L and the adsorption temperature was 25 °C. Moreover, the inorganic salt of NaCl also showed great effect on the equilibrium adsorption capacity exceeding 0.8 mol/L. The static adsorption processes followed the Langmuir adsorption isothermal equation and Freundlich adsorption isothermal equation. Furthermore, L-histidine could be desorbed with 1.5 mol/L of ammonia solution, and the regeneration capacity of the spherical chitosan adsorbent was excellent.

Study on Decolorization of Wastewater Containing Acid Orange II by Adsorption on Expanded Graphite

2011 ◽  
Vol 183-185 ◽  
pp. 873-876
Author(s):  
Jun Jie Yue ◽  
Xing Long Jin ◽  
Zhao Hui Jin
Keyword(s):  
Ph Value ◽  
Expanded Graphite ◽  
Orange Ii ◽  
Dye Wastewater ◽  
Temperature Level ◽  
Initial Concentration ◽  
Acid Orange ◽  
Ph Values ◽  
Simulated Wastewater ◽  
Acid Orange Ii

In this paper, the adsorption and decolorization capability of expanded graphite (EG) on the simulated wastewater containing Acid Orange Ⅱwere studied. The experimental results show that the initial concentration of wastewater, the dosage of EG, the pH value and the temperature all have greater effects on the decolorization ratio of simulated Acid Orange Ⅱ wastewater. The dye- wastewater containing lower concentration(＜150 mg/L) of Acid Orange Ⅱ is more suitable to be treated by EG, and approximately 100 mg/L is the preferable concentration. The decolorization ratio increases with the increment of the dosage of EG and the temperature level, but the growth rate obviously decreases at the higher initial concentration. All the decolorization ratios under strong acidic (pH<5) and alkalic (pH>11) conditions are higher than that at the range of 5-11 pH values, the highest value even reaches over 94%, while the decolorization ratio under the latter conditions are only between 75% and 85%.

Adsorption of Organic Compounds on Refined Latvian Clay

2018 ◽  
Vol 788 ◽  
pp. 83-88
Author(s):  
Oskars Leščinskis ◽  
Ruta Švinka ◽  
Visvaldis Švinka
Keyword(s):  
Methyl Orange ◽  
Zeta Potential ◽  
Adsorption Capacity ◽  
Clay Minerals ◽  
Organic Compounds ◽  
Clay Mineral ◽  
Rhodamine B ◽  
Ph Value ◽  
Ftir Spectra ◽  
Ph Values

Clays are materials consisting of clay minerals and non-clay minerals. Clay mineral fraction is considered to be a nanofraction. Clay minerals can be used for water purification and treatment. Description and characterization of 3 different Latvian clay nanosized minerals from 3 different geological periods (clay Liepa from Devonian period, clay Vadakste from Triassic period and clay Apriki from Quaternary period) as well as their adsorption capacity concerning organic compounds such as methyl orange and rhodamine B are summarized. Nanosized clay mineral particles were obtained using sedimentation method. Particle size distribution, zeta potential and FTIR spectra is given. The adsorption tests of above mentioned organic compounds were carried out in water solutions at 3 different pH values. The adsorption values were determined by means of UV-spectrophotometric technique. Zeta potential values for clay minerals Apriki, Liepa and Vadakste are -40.9 mV, -49.6 mV and -43.0 mV, respectively. FTIR spectra show similar tendencies for all 3 clay minerals. The best adsorption capacity concerning methyl orange and rhodamine B were in solutions with a pH value of 2, whereas at neutral and alkaline pH values adsorption in 24 hours was not observed.

Nanoparticle Fe3O4 magnetized activated carbon from Armeniaca sibirica shell for the adsorption of Hg(II) ions

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 6100-6120
Author(s):  
Yinan Hao ◽  
Yanfei Pan ◽  
Qingwei Du ◽  
Xudong Li ◽  
Ximing Wang
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Entropy Change ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Adsorption Parameters ◽  
Initial Concentration

Armeniaca sibirica shell activated carbon (ASSAC) magnetized by nanoparticle Fe3O4 prepared from Armeniaca sibirica shell was investigated to determine its adsorption for Hg2+ from wastewater. Fe3O4/ASSAC was characterized using XRD (X-ray diffraction), FTIR (Fourier transform infrared spectroscopy), SEM (scanning electron microscopy), and BET (Brunauer–Emmett–Teller). Optimum adsorption parameters were determined based on the initial concentration of Hg2+, reaction time, reaction temperature, and pH value in adsorption studies. The experiment results demonstrated that the specific surface area of ASSAC decreased after magnetization; however the adsorption capacity and removal rate of Hg2+ increased 0.656 mg/g and 0.630%, respectively. When the initial concentration of Hg2+ solution was 250 mg/L and the pH value was 2, the adsorption time was 180 min and the temperature was 30 °C, and with the Fe3O4/ASSAC at 0.05 g, the adsorption reaching 97.1 mg/g, and the removal efficiency was 99.6%. The adsorption capacity of Fe3O4/ASSAC to Hg2+ was in accord with Freundlich isotherm models, and a pseudo-second-order kinetic equation was used to fit the adsorption best. The Gibbs free energy ΔGo < 0，enthalpy change ΔHo < 0, and entropy change ΔSo < 0 which manifested the adsorption was a spontaneous and exothermic process.

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