Removal of inorganic arsenic from aqueous solution by Fe-modified ceramsite: batch studies and remediation trials

Abstract During sediment remediation, adsorbents addition is an effective technology for the removal of contaminants but the cost is often high. In this study, a low-cost adsorbent, ceramsite that made from contaminated riverbed sediment was synthesized. The Fe-modified ceramsite (FMC) was used as adsorbents to remove arsenate from aqueous solutions and reduce the inorganic arsenic release from contaminated sediments. Kinetic studies showed that chemisorption mainly governed the adsorption process while batch studies yielded theoretical adsorption capacity for arsenate of 10.63 mg/g at pH = 7 condition. Co-existing anions and pH have no significant impact on the adsorption process. In the regeneration studies, 91, 86, and 80% of the adsorption capacity were recovered in 3 cycles. In-situ remediation trials revealed that the addition of the adsorbent to sediment surface significantly reduced the release of inorganic arsenic into aqueous system, with a reduction efficiency of 86%. Furthermore, the species of the arsenic in the surface layer was significantly inactivated from an active state to a stable state. These findings highlight the application of the FMC as a facile and cost-effective adsorbent for containment of arsenic in solutions and sediments, demonstrating that they are highly applicable for practical cases.

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The investigation into the adsorption removal of ammonium by natural and modified zeolites: kinetics, isotherms, and thermodynamics

Water SA ◽

10.17159/wsa/2019.v45.i4.7546 ◽

2019 ◽

Vol 45 (4 October) ◽

Cited By ~ 1

Author(s):

Min Pan ◽

Mingchuan Zhang ◽

Xuehua Zou ◽

Xuetong Zhao ◽

Tianran Deng ◽

...

Keyword(s):

Adsorption Capacity ◽

Adsorption Process ◽

Low Cost ◽

Kinetic Studies ◽

Order Kinetic ◽

Regeneration Rate ◽

Ammonium Removal ◽

Ammonium Adsorption ◽

Order Kinetic Model ◽

Pseudo Second Order

The objectives of this study were to modify Chinese natural zeolite by NaCl and to investigate its suitability as a low-cost clay adsorbent to remove ammonium from aqueous solution. The effect of Ph on ammonium removal was investigated by batch experiments. The findings indicated that Ph has a significant effect on the removal of ammonium by M-Zeo and maximum adsorption occurred at Ph 8. Ion exchange dominated the ammonium adsorption process at neutral Ph, with the order of exchange selectivity being Na+ > Ca2+ > K+ > Mg2+. The Freundlich model provided a better description of the adsorption process than the Langmuir model. The maximum ammonium adsorption capacity was 17.83 mg/g for M-Zeo at 293K. Considering the adsorption isotherms and thermodynamic studies, the adsorption of ammonium by M-Zeo was endothermic and spontaneous chemisorption. Kinetic studies indicated that the adsorption of ammonium onto M-Zeo is well fitted by the pseudo-second-order kinetic model. Ea in the Arrhenius equation suggested the adsorption of ammonium on M-Zeo was a fast and diffusion-controlled process. The regeneration rate was 90.61% after 5 cycles. The removal of ammonium from real wastewater was carried out, and the removal efficiency was up to 99.13%. Thus, due to its cost-effectiveness and high adsorption capacity, M-Zeo has potential for use in ammonium removal from aqueous solutions.

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Kinetic Studies of Cs+ and Sr2+ Ion Exchange Using Clinoptilolite in Static Columns and an Agitated Tubular Reactor (ATR)

ChemEngineering ◽

10.3390/chemengineering5010009 ◽

2021 ◽

Vol 5 (1) ◽

pp. 9

Author(s):

Muhammad Yusuf Prajitno ◽

Mohamad Taufiqurrakhman ◽

David Harbottle ◽

Timothy N. Hunter

Keyword(s):

Adsorption Capacity ◽

Tubular Reactor ◽

Process Intensification ◽

Kinetic Studies ◽

Breakthrough Curves ◽

Maximum Adsorption Capacity ◽

Batch Studies ◽

Shear Mixing ◽

Natural Clinoptilolite ◽

Kinetics Of

Natural clinoptilolite was studied to assess its performance in removing caesium and strontium ions, using both static columns and an agitated tube reactor (ATR) for process intensification. Kinetic breakthrough curves were fitted using the Thomas and Modified Dose Response (MDR) models. In the static columns, the clinoptilolite adsorption capacity (qe) for 200 ppm ion concentrations was found to be ~171 and 16 mg/g for caesium and strontium, respectively, highlighting the poor material ability to exchange strontium. Reducing the concentration of strontium to 100 ppm, however, led to a higher strontium qe of ~48 mg/g (close to the maximum adsorption capacity). Conversely, halving the column residence time to 15 min decreased the qe for 100 ppm strontium solutions to 13–14 mg/g. All the kinetic breakthrough data correlated well with the maximum adsorption capacities found in previous batch studies, where, in particular, the influence of concentration on the slow uptake kinetics of strontium was evidenced. For the ATR studies, two column lengths were investigated (of 25 and 34 cm) with the clinoptilolite embedded directly into the agitator bar. The 34 cm-length system significantly outperformed the static vertical columns, where the adsorption capacity and breakthrough time were enhanced by ~30%, which was assumed to be due to the heightened kinetics from shear mixing. Critically, the increase in performance was achieved with a relative process flow rate over twice that of the static columns.

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Removal of VOCs Using Sludge-Based Adsorbents

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.599.305 ◽

2012 ◽

Vol 599 ◽

pp. 305-308 ◽

Cited By ~ 1

Author(s):

Ping Fang ◽

Chao Ping Cen ◽

Hong Tao Zhang ◽

Zi Jun Tang ◽

Ding Sheng Chen ◽

...

Keyword(s):

Adsorption Capacity ◽

Physical Adsorption ◽

Low Cost ◽

Fixed Bed ◽

Cost Effective ◽

Langmuir Adsorption Isotherm ◽

Fixed Bed Reactor ◽

Dynamic Adsorption ◽

Langmuir Adsorption ◽

Isotherm Equations

Efficient and cost-effective sludge-based adsorbents were developed and the adsorption of VOCs on the sludge-based adsorbents was studied in a fixed bed reactor. The results indicate that the adsorption of VOCs on sludge-based adsorbents is typical physical adsorption, the dynamic adsorption capacity of VOCs on adsorbents sharply increases as the VOCs concentration is increased at first, then increasing gradually, at last retains stable with the change of VOCs concentration. The dynamic adsorption capacity of sludge-based adsorbents for VOCs is O-Xylene > Butylcetate > Toluene > Ethylacetate > Benzene > Propanone > n-Hexane, the maximum dynamic adsorption capacity is 0.247, 0.225, 0.192, 0.186, 0.180, 0.176, 0.133g/g, respectively. Meanwhile the adsorption of VOCs on sludge-based adsorbents corresponds to the Langmuir adsorption isotherm equations. The sludge-based adsorbent is a low-cost alternative to activated carbon for VOCs treatment, and this technology is a promising method for the VOCs removal.

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Assessment of Urtica as a low-cost adsorbent for methylene blue removal: kinetic, equilibrium, and thermodynamic studies

Chemical Papers ◽

10.1515/chempap-2015-0097 ◽

2015 ◽

Vol 69 (7) ◽

Cited By ~ 5

Author(s):

Mohammad Peydayesh ◽

Mojgan Isanejad ◽

Toraj Mohammadi ◽

Seyed Mohammad Reza Seyed Jafari

Keyword(s):

Methylene Blue ◽

Adsorption Process ◽

Low Cost ◽

Cost Effective ◽

Sem Analysis ◽

Order Kinetic ◽

Solution Ph ◽

Factors Affecting ◽

Order Kinetic Model ◽

Mb Adsorption

AbstractMethylene blue (MB) removal using eco-friendly, cost-effective, and freely available Urtica was investigated. The morphology of the adsorbent surface and the nature of the possible Urtica and MB interactions were examined using SEM analysis and the FTIR technique, respectively. Various factors affecting MB adsorption such as adsorption time, initial MB concentration, temperature, and solution pH were investigated. The adsorption process was analysed using different kinetic models and isotherms. The results showed that the MB adsorption kinetic follows a pseudo-second-order kinetic model and the isotherm data fit the Langmuir isotherm well. Thermodynamic parameters, such as ΔG°, ΔH°, and ΔS°, were also evaluated, and the results indicated that the adsorption process is endothermic and spontaneous in nature. The MB adsorption capacity of Urtica was found to be as high as 101.01 mg g

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Investigation of Modified Mangrove Bark on the Sorption of Oil in Water

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.567.74 ◽

2014 ◽

Vol 567 ◽

pp. 74-79 ◽

Cited By ~ 3

Author(s):

Asadpour Robabeh ◽

Nasiman Sapari ◽

Mohamed Hasnain Isa ◽

Kalu Uka Orji

Keyword(s):

Palmitic Acid ◽

Adsorption Capacity ◽

Sorption Capacity ◽

Oil Spills ◽

Low Cost ◽

Correlation Coefficients ◽

Kinetic Studies ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Order Kinetic Model

Today oil spills generally cause worldwide worry due to their damaging effects on environment. Use of agricultural wastes such as raw and modified mangrove barks (RhizophoraApiculata), as an abundant and low cost adsorbent for oil-products spill cleanup in aquatic systems, has been developed to control these spills. Sorption capacity can improve by modification of adsorbent. The modification significantly increased the hydrophobicity of the adsorbent. The raw mangrove bark was modified using fatty acid (Palmitic acid) to improve its adsorption capacity. Oil sorption capacity of the modified bark was studied and compared with the raw bark. Kinetic tests were conducted with a series of contact time. The kinetic studies show good correlation coefficients for a pseudo-first-order kinetic model. A correlation between surface functional groups of the adsorbent was studied by FTIR spectrum. The results gave the maximum adsorption capacity of 2640.00 ± 2.00 mg/g for Palmitic acid treated bark (PTB). The prepared adsorbent revealed the potential to use as a low-cost adsorbent in oil-spill clean-up.

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Equilibrium and Kinetic Studies of Biosorptive Removal of 2,4,6-Trichlorophenol from Aqueous Solutions Using Untreated Agro-Waste Pine Cone Biomass

Processes ◽

10.3390/pr7100757 ◽

2019 ◽

Vol 7 (10) ◽

pp. 757 ◽

Cited By ~ 1

Author(s):

Siva Kumar ◽

Asif ◽

Poulose ◽

Suguna ◽

Al-Hazza

Keyword(s):

Low Cost ◽

Agricultural Waste ◽

Kinetic Studies ◽

Cost Effective ◽

Biosorption Capacity ◽

Pine Cone ◽

Cost Effective Treatment ◽

Initial Ph ◽

Equilibrium Data ◽

Biomass Dosage

The present work discusses the adsorptive removal of a phenolic pollutant, i.e., 2,4,6-trichlorophenol (TCP), using low cost untreated agricultural waste pine cone powder (PCP). The present biosorbent was thoroughly characterized with the help of FTIR, SEM, XRD, and CHN analysis. The presence of amine (-NH2), hydroxyl (-OH) and carbonyl (C=O) functional groups was detected by the FTIR analysis. The important biosorption factors like agitation time, biomass dosage, initial adsorbate concentration, and the initial pH were examined by batch studies. The biosorption kinetic process was fast, reaching equilibrium in 75 min. The experimental kinetic data revealed an excellent agreement with the pseudo second order (PSO) model. On the other hand, the Langmuir isotherm model best described the equilibrium data with the maximum biosorption capacity (qmax) of 243.90 mg/g. These values are better than the adsorption capacities of most agro-based untreated adsorbents previously reported in the literature. Owing to fast removal rates and high biosorption capacity, PCP can be used for cost-effective treatment of TCP from aqueous streams.

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Adsorption of crystal violet dye onto olive leaves powder: Equilibrium and kinetic studies

10.31219/osf.io/c4uqx ◽

2021 ◽

Author(s):

CI Chemistry International

Keyword(s):

Aqueous Solutions ◽

Adsorption Capacity ◽

Crystal Violet ◽

Low Cost ◽

Wave Length ◽

Kinetic Studies ◽

Absorption Spectrometry ◽

Isotherm Models ◽

Olive Leaves ◽

Crystal Violet Dye

Adsorption of crystal violet dye from aqueous solutions applying olive leaves powder (OLP) as a biosorbent has been examined under various experimental circumstances. The influence of contact time, pH, initial concentration of studied dye and adsorbent dose on the adsorption process has been investigated applying batch experiments. The concentration of remaining dye has been determined using molecular absorption spectrometry at wave length of 580 nm. The maximum removal of studied dye has been realized at pH 7.5 with a percent removal of 99.2% after 20 min of agitation time. Langmuir, Freundlich, and Temkin isotherm models exemplify the best fit for the experimental data; while the elevated adsorption capacity was 181.1 mg.g1. Adsorption kinetics of crystal violet was expected sufficiently with the empirical pseudo-second-order model. Corresponding to the adsorption capacity, olive leaves powder thought as a low cost, effective, and environmentally friendly biosorbent for the removal of crystal violet dye from aqueous solutions.

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Sorption of Bivalent Ions by Cymbopogon citratus: Characterisation and Investigation of Biosorptive Capacity and Mechanism

Journal of Environmental Science and Pollution Research ◽

10.30799/jespr.140.18040303 ◽

2018 ◽

Vol 4 (3) ◽

pp. 297-302

Author(s):

S. Jayashree ◽

Jeyavathana Samuel ◽

R. Vashantha

Keyword(s):

Aqueous Solution ◽

Metal Ion ◽

Adsorption Process ◽

Low Cost ◽

Kinetic Studies ◽

Solution Temperature ◽

Isotherm Models ◽

Physical Parameters ◽

Cymbopogon Citratus ◽

Equilibrium Data

The main objective of this study was to investigate the removal of cadmium(II) ions from aqueous solution using raw Cymbopogon citratus as an adsorbent. It was characterized by FT-IR, XRD, SEM-EDAX and its physical parameters were analyzed. Different factors such as pH, contact time, initial concentration and temperature were studied. Maximum adsorption was taken place at the optimum pH of 6 and the equilibrium data were analyzed by Langmuir, Freundlich and Temkin Isotherm models. Among those isotherm models Langmuir and Temkin were fitted well with good correlation coefficient (R2). The negative values of ΔG⁰ for all temperature shows the adsorption process for cadmium(II) ion was spontaneous in nature and feasible. The negative value of enthalpy change ΔH⁰ shows the adsorption process is exothermic and the positive value of ΔS⁰ indicates the disorderness or randomness process of adsorption. The positive value of Ea indicates the higher solution temperature favors the adsorption of metal ion onto RCC. The experimental data were analyzed by kinetic studies such as pseudo-first order, pseudo-second order and intra-particle diffusion models. Desorption was also studied and the recovery of the adsorbent was found to be 10%. Thus on the basis of these investigations the present study concludes that the raw Cymbopogon citratus (RCC) was found to be highly effective, nontoxic, environmental friendly and low cost adsorbent for the removal of toxic Cd(II) ions from aqueous solution.

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Removal of brilliant green (BG) from aqueous solution by using low cost biomass Salix alba leaves (SAL): thermodynamic and kinetic studies

Journal of Water Reuse and Desalination ◽

10.2166/wrd.2020.054 ◽

2020 ◽

Vol 10 (1) ◽

pp. 70-81

Author(s):

Rashida Fiaz ◽

Muhammad Hafeez ◽

Rashid Mahmood

Keyword(s):

Aqueous Solution ◽

Brilliant Green ◽

Low Cost ◽

Kinetic Studies ◽

Sorption Process ◽

Salix Alba ◽

Batch Studies ◽

Equilibrium Data ◽

Pseudo Second Order ◽

Maximum Removal

Abstract The removal of brilliant green dye (BGD) from aqueous solution by using Salix alba leaves (SAL) was carried out via batch studies. The maximum removal efficiency was found to be 95.2% with initial dye concentration 50 mg/L at 0.15 g adsorbent dosage, pH = 6, and 298 K temperature, and the equilibrium was observed within 3½ hours. The adsorption capacity increased (2.21–15.89 mg/g) from 10 to 50 mg/L of dye concentration. Kinetic and isotherm studies were also carried out. The results showed that pseudo-second order model better describes the adsorption mechanism. The isotherm equilibrium data analysis was carried out by using Freundlich and Langmuir models and the sorption process was observed to conform with the Langmuir isotherm with linear correlation coefficient (R2 = 0.99). The thermodynamic properties ΔG°, ΔH°, and ΔS° delineated that BGD adsorption over SAL was feasible, spontaneous, and endothermic between 303 and 323 K temperature.

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Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

Water ◽

10.3390/w11020281 ◽

2019 ◽

Vol 11 (2) ◽

pp. 281 ◽

Cited By ~ 7

Author(s):

Adriana Medina-Ramirez ◽

Procoro Gamero-Melo ◽

Beatriz Ruiz-Camacho ◽

Jesus Isaac Minchaca-Mojica ◽

Rafael Romero-Toledo ◽

...

Keyword(s):

Adsorption Capacity ◽

Adsorption Process ◽

Low Cost ◽

Underground Water ◽

Ferrous Chloride ◽

Removal Capacity ◽

Endothermic Process ◽

Arsenite Removal ◽

Ph Range ◽

Coexisting Ions

The high toxicity of arsenite and the difficulty to remove it is one of the main challenges for water treatment. In the present work the surface of a low cost zeolite was modified by chemical treatment with a ferrous chloride to enhance its arsenite adsorption capacity. The effect of pH, ions coexistence, concentration, temperature and dosage was studied on the adsorption process. Additionally, the Fe-modified W zeolite was aged by an accelerated procedure and the regeneration of the exhausted zeolite was demonstrated. The Fe-modified W zeolite was stable in the pH range of 3 to 8 and no detriment to its arsenite removal capacity was observed in the presence of coexisting ions commonly found in underground water. The studies showed that the adsorption of As (III) on Fe-modified W zeolite is a feasible, spontaneous and endothermic process and it takes place by chemical bonding. The exhausting process proved the adsorption of 0.20 mg g−1 of As (III) by the Fe-modified W zeolite and this withstand at least five aging cycles without significant changes of its arsenite adsorption capacity. Fe-modified W zeolite prepared from fly ash might be a green and low-cost alternative for removal of As (III) from groundwater.

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