scholarly journals Adsorption Properties of Waste Building Sludge for Environmental Protection

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 309
Author(s):  
Barbora Doušová ◽  
Eva Bedrnová ◽  
Pavel Reiterman ◽  
Martin Keppert ◽  
David Koloušek ◽  
...  
Keyword(s):  
Environmental Protection ◽  
Adsorption Capacity ◽  
Environmentally Friendly ◽  
Adsorption Properties ◽  
Langmuir Model ◽  
Adsorption Selectivity ◽  
Laboratory Temperature ◽  
Adsorption Affinity ◽  
Adsorption Data ◽  
Modified Forms

Waste building sludge (WBS) originating in the production of concrete prestressed poles (CSW) and technical stone (TSW) used in original and Fe-modified forms (CSWFe, TSWFe) was tested as an environmentally friendly and cheap sorbent of selected cations (Cd2+, Pb2+, Cs+) and anions (AsO43−, PO43−, CrO42−) from water. The experiments were performed with 0.1 and 0.5 mmol·L−1 model solutions in a batch manner at laboratory temperature. Adsorption data were fitted with the Langmuir model. The adsorption of cations (Pb2+ and Cd2+) ran almost quantitatively (>97%) on both CSW and TSW. Cesium (Cs+) adsorption on TSW reached 80%, while in the case of CSW, it was ineffective. The modification of CSW and TSW with FeII (CSWFe and TSWFe) improved their adsorption selectivity to anions by up to 70%. The adsorption of PO43− and AsO43− ran quantitatively (>98%) on modified CSWFe and TSWFe and also on initial CSW, while CrO42− was effectively adsorbed (≈80%) on TSWFe only. The adsorption affinity of tested ions in terms of adsorption capacity and sorbent consumption declined in order as follows: Pb2+ ≈ Cd2+ >> Cs+ for cations and AsO43− ≈ PO43− > CrO42− for anions.

Surface Charge and Adsorption Characteristics for Fluoride of Hexadecyltrimethylammonium Modified Vermiculite

2013 ◽  
Vol 781-784 ◽  
pp. 2265-2268 ◽  
Author(s):  
Shi Yong Wei ◽  
Xu Hong Deng
Keyword(s):  
Aqueous Solutions ◽  
Surface Charge ◽  
Adsorption Capacity ◽  
Langmuir Model ◽  
Point Of Zero Charge ◽  
Hexadecyltrimethylammonium Bromide ◽  
Fluoride Ions ◽  
Langmuir Adsorption ◽  
Adsorption Characteristics ◽  
Adsorption Data

HDTMA-modified vermiculite (HDTMA-Ver) was formed in a suspension by the interactions between vermiculite and hexadecyltrimethylammonium bromide (HDTMA). For vermiculite and HDTMA-Ver, the pH of the point of zero charge (pHpzc) is 3.16 and 5.09, the surface charge at pH 4.5 is-0.167 and 0.083 mmol/g, and the Langmuir adsorption capacity (qmax) is 4.98 and 8.67 mg/g, respectively. The adsorption data for fluoride by vermiculite and HDTMA-Ver could be fitted by Langmuir model. The as-prepared HDTMA-Ver exhibited excellent ability to remove fluoride ions from aqueous solutions.

Adsorption of Mercury Ion on Activated Carbons from Rice Husk

2012 ◽  
Vol 161 ◽  
pp. 162-166 ◽  
Author(s):  
Xiao Lan SONG ◽  
Ying Zhang ◽  
Cheng Yin Yan ◽  
Wen Juan Jiang ◽  
Hong Jiang Xie
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Rice Husk ◽  
Activated Carbons ◽  
Langmuir Model ◽  
Mercury Ion ◽  
Maximum Adsorption Capacity ◽  
Adsorption Performance ◽  
Monolayer Adsorption ◽  
Adsorption Data

The adsorption performance of mercury ion onto activated carbon prepared from rice husk with NaOH was carried out at initial concentration of 100 mg/L. The activated carbon obtained at 800 °C possessed the outstanding specific surface area of 2786 m2/g. And the results showed that the maximum adsorption capacity of Hg2+ was recorded as 342.0 mg/g due to abundant micropores of 1.076 nm. In addition, the adsorption data were well explained by the Langmuir model with the monolayer adsorption capacity of 555.6 mg/g.

Hydrous Iron(III)-Tin(IV) Binary Mixed Oxide: Arsenic Adsorption Behaviour from Aqueous Solution

2006 ◽  
Vol 41 (2) ◽  
pp. 198-209 ◽  
Author(s):  
Uday Chand Ghosh ◽  
Durjoy Bandyopadhyay ◽  
Biswaranjan Manna ◽  
Manik Mandal
Keyword(s):  
Adsorption Capacity ◽  
Mixed Oxide ◽  
Kinetic Data ◽  
Kinetic Equations ◽  
Isotherm Model ◽  
Adsorption Behaviour ◽  
Arsenic Adsorption ◽  
Adsorption Affinity ◽  
Adsorption Data ◽  
Model Equations

Abstract Groundwater in the Bengal delta plain is primarily in an anoxic environment and As(III)/As(total) ratios reported are in the range of 0.60 to 0.90. Most of the studied adsorbents showed greater adsorption affinity for less toxic As(V) than for more toxic As(III). The synthesis and physicochemical characterizations of iron(III)-tin(IV) binary mixed oxide composite with systematic arsenic adsorption behaviour are reported here. The parameters studied are the effect of pH, adsorption capacity with varying arsenic loads, contact time for kinetics and isotherm modelling by batch method. In the pH range of 3.0 to 9.0, the adsorption of As(III) is found to be nearly the same while that of As(V) decreases with increasing pH for the studied arsenic concentrations (5.0 to 20.0 mg L-1). The adsorption data were analyzed using various kinetic and isotherm model equations. The rate of adsorption of As(III) was faster than that of As(V) at equilibrium pH ~7.0 and temperature 30(± 2)°C. The adsorption kinetic data for arsenic fitted best with the Ho's pseudo-second order [R2 ~0.99–1.00 for As(III) and ~0.97–0.98 for As(V)] and parabolic diffusion (R2 ~0.98–0.99) equations. The present kinetic data fitted the power function and simple Elovich kinetic equations well (R2 = ~0.97–1.00), except the data obtained for As(III) from the 20.0 mg L-1 solution. The analyses of adsorption data for As(III) and As(V), respectively, at equilibrium pH 6.8(±0.1) and 7.3(±0.1) with three different two-parameter isotherm model equations show the fitting order: Langmuir < Freundlich >Temkin. The monolayer adsorption capacity (θ0, mg g-1) values evaluated from the Langmuir isotherm for As(III) and As(V) are 43.86 and 27.55, respectively.

A Novel Chelating Resin, Polystyrene-Supported Glucosamine: Preparation and Adsorption Properties for Ag(Ⅰ)

2011 ◽  
Vol 197-198 ◽  
pp. 478-482
Author(s):  
Hai Lan Huang ◽  
Guo Ming Wang ◽  
Rong Jun Qu ◽  
Xu Bo
Keyword(s):  
Adsorption Capacity ◽  
Considerable Change ◽  
Adsorption Properties ◽  
Langmuir Model ◽  
Chelating Resin ◽  
Isothermal Process ◽  
Adsorption Dynamics ◽  
Freundlich Model ◽  
Repeated Use ◽  
Adsorption Desorption

A novel chelating resin, crosslinking polystyrene-supported glucosamine (PS-GA), was prepared and its static adsorption properties for Ag(Ⅰ) were studied. The results indicated that this resin had excellent adsorption capacity for Ag(Ⅰ). The adsorption dynamics indicated that adsorption was controlled by the liquid film diffusion and the apparent activation energy Ea was 11.83 kJ/mol. Both Langmuir model and Freundlich model could describe the adsorption isothermal process of Ag(Ⅰ), and ∆G, ∆H, ∆S values were calculated. Increasing the temperature was beneficial to adsorption. The chelating resin can be easily regenerated by 2% thiourea in 0.1 mol/L HNO3 with higher effectiveness. Five adsorption–desorption cycles demonstrated that this resin was suitable for repeated use without considerable change in adsorption capacity.

Relationship between biochars’ porosity and adsorption of three neutral herbicides from water

2016 ◽  
Vol 75 (2) ◽  
pp. 482-489 ◽  
Author(s):  
Saijun Li ◽  
Jinhong Lü ◽  
Tao Zhang ◽  
Yueqiang Cao ◽  
Jianfa Li
Keyword(s):  
Adsorption Capacity ◽  
Surface Area ◽  
Organic Molecules ◽  
Total Surface Area ◽  
Langmuir Model ◽  
Partition Model ◽  
Molecular Dimension ◽  
Adsorption Data ◽  
The Moment ◽  
The Relationship

The porous biochars have exhibited good adsorption to many organic pollutants, but the relationship between biochars’ porosity and their adsorption capacity is not clear at the moment. In this work, six biochars were produced from different feedstocks and under different pyrolysis conditions, and used for adsorption of three neutral herbicides from water. The results demonstrated that the adsorption capacity was dominated by the mesopore (1.7–50 nm) area of biochars, instead of their total surface area, according to the analysis of surface area-normalized adsorption data with both Langmuir model and a mixed adsorption and partition model. The results implied the inaccessibility of most micropores in biochars to the organic molecules with nano-scale molecular dimension, and alkalis in feedstock and an oxygen-containing atmosphere in heat treatment for producing biochars would favor the development of mesopores.

scholarly journals Adsorption of methanol and water vapor on modified forms of mordenite–clinoptilolite rock

2018 ◽  
Vol 36 (3-4) ◽  
pp. 927-935 ◽  
Author(s):  
Antonina D Kustovska
Keyword(s):  
Thermal Stability ◽  
Water Vapor ◽  
Adsorption Capacity ◽  
Thermal Activation ◽  
Adsorption Properties ◽  
Microporous Structure ◽  
Adsorption Ability ◽  
Modified Forms ◽  
Thermal Stability Of

The influence of thermal activation, decationation, and dealumination on adsorption properties of rock from Transcarpathian deposit (Lypcha village, Ukraine) containing mordenite and clinoptilolite at the ratio 1:1 was studied in this research. Taking into account the need of preliminary thermal activation of adsorbent, the research of thermal stability of zeolite component of rock was conducted. Parameters of microporous structure of decationated and dealuminated samples were calculated. Obtained results show that decationation of mordenite–clinoptilolite rock leads to insignificant increase and dealumination leads to significant decrease of adsorption capacity for water. Maximal adsorption ability for methanol is about 50% dealumination degree of the sample.

Adsorption Characteristics for Fluoride of Two Hydroxy-Aluminum Pillared Montmorillonites

2013 ◽  
Vol 781-784 ◽  
pp. 2261-2264 ◽  
Author(s):  
Shi Yong Wei ◽  
Xu Hong Deng
Keyword(s):  
Adsorption Capacity ◽  
Ph Value ◽  
Langmuir Model ◽  
Langmuir Adsorption ◽  
Adsorption Characteristics ◽  
Fluoride Adsorption ◽  
Adsorption Data ◽  
Optimum Ph ◽  
Pillared Montmorillonites

Two hydroxy-aluminum pillared montmorillonites (Al-Mt-20 and Al-Mt-80) were prepared at 20°C and 80°C, respectively. The adsorption characteristics for fluoride by Al-Mt-20 and Al-Mt-80 were investigated. Results showed that the d (001) spacing of montmorillonite in Al-Mt-20 and Al-Mt-80 was 1.392 and 1.481 nm, respectively. The optimum pH value for fluoride adsorption was about 4-5. At pH 4.8, the Langmuir adsorption capacity (qmax) for fluoride of Al-Mont-20 and Al-Mont-80 was 7.12 mg/g and 9.78 mg/g, respectively. The adsorption data for fluoride by Al-Mont-20 and Al-Mont-80 could be fitted by Langmuir model (R2 =0.982-0.987), indicating that Langmuir model is suitable to fit the fluoride adsorption of Al-Mont-20 and Al-Mont-80.

Synthesis and Adsorption Properties of Salicylic Acid Modified Hypercrosslinked Polymer Toward 4-Chloro-Phenol and Heavy Metals

2014 ◽  
Vol 675-677 ◽  
pp. 158-162 ◽  
Author(s):  
Guan Hua Meng ◽  
Bao He Liu ◽  
Yu Ling Wu ◽  
Jun Zhang
Keyword(s):  
Heavy Metals ◽  
Salicylic Acid ◽  
Adsorption Capacity ◽  
Adsorption Properties ◽  
Bet Surface Area ◽  
Polluted Water ◽  
Capacity Measurement ◽  
Adsorption Data ◽  
Exothermic Process ◽  
Ft Ir

To explore the possibility of simultaneously adsorptive treating polluted water containing both organics and heavy metals, multifunctional polymeric resin NDA-1500 was prepared through chemically modification of chloromated polystyrene with salicylic acid. The FT-IR, BET surface area measurements and sodium capacity measurement were applied to characterize the properties of NDA-1500. The adsorption properties toward 4-chloro-phenol and heavy metals such as Pb2+, Cu2+ and Ni2+ ions were studied respectively. The adsorption data of the NDA-1500 toward 4-chloro-phenol fit well with Langmuir model. The adsorption capacity of NDA-1500 toward 4-chloro-phenol was higher than that of unmodified NDA-150 and adsorption capacity decreased with increase of temperature suggesting the exothermic process. The removal efficiencies of metal ions by NDA-1500 were also 2-3 times higher than that of NDA-150 and the metals were recovered completely with 0.2 mol/L hydrochloric acid.

scholarly journals Adsorption and Desorption Mechanisms of Rare Earth Elements (REEs) by Layered Double Hydroxide (LDH) Modified with Chelating Agents

2019 ◽  
Vol 9 (22) ◽  
pp. 4805 ◽  
Author(s):  
Shuang Zhang ◽  
Naoki Kano ◽  
Kenji Mishima ◽  
Hirokazu Okawa
Keyword(s):  
Rare Earth ◽  
Quantum Chemistry ◽  
Rare Earth Elements ◽  
Adsorption Capacity ◽  
Density Functional ◽  
Stable State ◽  
Experimental Result ◽  
Adsorption And Desorption ◽  
Adsorption Affinity ◽  
Quantum Chemistry Calculations

In order to obtain the adsorption mechanism and adsorption structures of Rare Earth Elements (REEs) ions adsorbed onto layered double hydroxides (LDH), the adsorption performance of LDH and ethylenediaminetetraacetic acid (EDTA) intercalated LDH for REEs was investigated by batch experiments and regeneration studies. In addition to adsorption capacity, the partition coefficient (PC) was also evaluated to assess their true performance metrics. The adsorption capacity of LDH increases from 24.9 μg·g−1 to 145 μg·g−1 for Eu, and from 20.8 μg·g−1 to 124 μg·g−1 for La by intercalating EDTA in this work; and PC increases from 45.5 μg·g−1·uM−1 to 834 μg·g−1·uM−1 for Eu, and from 33.6 μg·g−1·μM−1 to 405 μg·g−1·μM−1 for La. Comparison of the data indicates that the adsorption affinity of EDTA-intercalated LDH is better than that of precursor LDH no matter whether the concept of adsorption capacity or that of the PC was used. The prepared adsorbent was characterized by XRD, SEM-EDS and FT-IR techniques. Moreover, quantum chemistry calculations were also performed using the GAUSSIAN09 program package. In this calculation, the molecular locally stable state structures were optimized by density functional theory (DFT). Both the quantum chemistry calculations and the experimental data showed that REEs ions adsorbed by EDTA-intercalated LDH are more stable than those adsorbed by precursor LDH. Furthermore, the calculation results of adsorption and desorption rates show that adsorption rates are larger for Eu(III) than for La(III), which agrees with the experimental result that Eu(III) has a higher adsorption ability under the same conditions. The LDHs synthesized in this work have a high affinity for removing REEs ions.

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