Effective adsorption of direct Red 23 by sludge biochar-based adsorbent: adsorption kinetics, thermodynamics and mechanisms study

Abstract Using solid adsorbents, such as biochar, has been a potential practice to remove the pollutants from water bodies to render the water safer for potential usage. A potential application of sludge biochar-based adsorbent (SBA) obtained by pyrolysis with hydrothermal treatment was developed to adsorb Direct Red 23 (DR23) from wastewater. The results showed that the synthesized SBA (0.5 g/L) in the adsorption of DR23 at low concentration (<20 mg/L), the DR23 were totally removed from the aqueous solution. PH had a limited effect on the adsorption, while an increase in temperature was shown to have a large enhancing effect. The adsorption kinetics were the best fit by the pseudo-second-order kinetic model, while the equilibrium data were best fitted by the Langmuir isotherm. A maximum saturation adsorption capacity of SBA of 111.98 mg/g was achieved. SBA could then be regenerated by pyrolysis, and after three cycles, SBA still retained the good adsorption ability of DR23, a removal rate exceeding 97% was achieved. Functional groups, pores, π-π bond, and electrostatic interactions are the key to the adsorption mechanisms. The results proved that SBA would be a promising material in the removal application of dyes in printing and dyeing wastewater.

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Adsorption kinetics and isotherm of vanadium with melamine

Water Science & Technology ◽

10.2166/wst.2017.094 ◽

2017 ◽

Vol 75 (10) ◽

pp. 2316-2321 ◽

Cited By ~ 19

Author(s):

Hao Peng ◽

Zuohua Liu ◽

Changyuan Tao

Keyword(s):

Adsorption Kinetics ◽

Impact Factors ◽

Order Kinetic ◽

Freundlich Model ◽

Initial Ph ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Adsorption Kinetics And Isotherm ◽

Langmuir And Freundlich Models

Melamine, possessing three free amino groups and three aromatic nitrogen atoms in its molecule, has great potential as an adsorbent for metal ions. We investigated three impact factors of the adsorption process: the initial pH of the vanadium solution, contact time and reaction temperature. The adsorption kinetics could be accurately described by the pseudo-second-order kinetic model. Langmuir and Freundlich models fitted well with the experimental equilibrium data, and the maximal adsorption capacity was found to be 1,428.57 mg vanadium/g melamine, and the Freundlich model showed the adsorption is privilege type.

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Dye removal from aqueous solution by raw maize corncob and H3PO4 activated maize corncob

Journal of Water Reuse and Desalination ◽

10.2166/wrd.2017.179 ◽

2017 ◽

Vol 8 (2) ◽

pp. 214-224 ◽

Cited By ~ 5

Author(s):

M. Farnane ◽

H. Tounsadi ◽

A. Machrouhi ◽

A. Elhalil ◽

F. Z. Mahjoubi ◽

...

Keyword(s):

Aqueous Solution ◽

Order Kinetic ◽

Solution Ph ◽

Adsorption Performance ◽

Adsorption Capacities ◽

Monolayer Adsorption ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Best Fit

AbstractThe focus of this study is the investigation of removal ability of methylene blue (MB) and malachite green (MG) dyes from aqueous solution by raw maize corncob (RMC) and H3PO4 activated maize corncob (AMC). Maize corncobs were carbonized at 500 °C for 2 h, and then impregnated at a phosphoric acid to maize corncob ratio of 2.5 g/g. The impregnated maize corncob was activated in a tubular vertical furnace at 450 °C for 2 h. Samples were characterized by different methods. Adsorption experiments were carried out as a function of solution pH, adsorbent dosage, contact time, initial concentration of dyes and the temperature. Experimental results show that the activation of maize corncob boosts four times the adsorption performance for the selected dyes. The adsorption process is very rapid and was pH dependent with high adsorption capacities in the basic range. The kinetic data were fitted with the pseudo-second-order kinetic model. The best fit of equilibrium data was obtained by the Langmuir model with maximum monolayer adsorption capacities of 75.27 and 271.19 mg/g for MB, 76.42 and 313.63 mg/g for MG, respectively, in the case of RMC and AMC. The temperature did not have much influence on the adsorption performance.

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Adsorption of Lead(II) Ions from Aqueous Solution onto Lignin

Adsorption Science & Technology ◽

10.1260/026361709790252623 ◽

2009 ◽

Vol 27 (4) ◽

pp. 435-445 ◽

Cited By ~ 11

Author(s):

Laura Bulgariu ◽

Dumitru Bulgariu ◽

Theodor Malutan ◽

Matei Macoveanu

Keyword(s):

Aqueous Solution ◽

Ion Concentration ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Solution Ph ◽

Batch System ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Langmuir Isotherm Model ◽

Pseudo Second Order

The adsorption of lead(II) ions from aqueous solution onto lignin was investigated in this study. Thus, the influence of the initial solution pH, the lignin dosage, the initial Pb(II) ion concentration and the contact time were investigated at room temperature (19 ± 0.5 °C) in a batch system. Adsorption equilibrium was approached within 30 min. The adsorption kinetic data could be well described by the pseudo-second-order kinetic model, while the equilibrium data were well fitted using the Langmuir isotherm model. A maximum adsorption capacity of 32.36 mg/g was observed. The results of this study indicate that lignin has the potential to become an effective and economical adsorbent for the removal of Pb(II) ions from industrial wastewaters.

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Preparation of Cotton Fibers Modified With Aromatic Heterocyclic Compounds and Study of Cr(VI) Adsorption Performance

10.21203/rs.3.rs-510086/v1 ◽

2021 ◽

Author(s):

Zhiyu Huang ◽

Peng Wu ◽

Yankun Yin ◽

Xiang Zhou ◽

Lu Fu ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Metal Ion ◽

Low Cost ◽

Order Kinetic ◽

Adsorption Mechanisms ◽

Adsorption Capacities ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Langmuir Isotherm Model ◽

Pseudo Second Order

Abstract In order to prepare low-cost and environmentally friendly adsorbent materials for adsorption of heavy metal ion, two kinds of novel modified cottons (C-4-APD and C-2-APZ) were obtained by introducing 4-aminopyridin and 2-aminopyrazine into the surface of degreasing cotton, respectively, and used for the removal of Cr(VI) ions from aqueous solution. The two modified cottons were characterized by Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), which confirmed the amino groups, pyridine groups and pyrazine groups grafted onto the surface of modified cottons. The maximum adsorption capacities of C-4-APD and C-2-APZ were 73.78 mg/g and 61.34 mg/g, respectively, at the optimum pH of 6 and an initial concentration of 200 mg/g. Kinetic and isotherm studies were carried out to investigate the adsorption behavior of the modified cottons on Cr(VI) ions. The results showed that the adsorption of Cr(VI) ions by modified cottons followed a pseudo-second-order kinetic model, the equilibrium data were in good agreement with the Langmuir isotherm model, and electrostatic and chemisorption may be the main adsorption mechanisms. The recovery and reuse of modified cotton were achieved by washing with 2 wt% thiourea-hydrochloric acid solution (0.5 mol/L concentration of HCl), and the adsorption capacities of C-4-APD and C-2-APZ were maintained above 90% and 80%, respectively, after six cycles.

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Removal and Adsorption Mechanism of Tetracycline Using Manganese-modified Cotton Straw Biochar in an Aqueous Solution

10.21203/rs.3.rs-917961/v1 ◽

2021 ◽

Author(s):

Xiao Liu ◽

Shaoyang Shi ◽

Xuefei Hu ◽

Tao Sun ◽

Juanxiang Zhang ◽

...

Keyword(s):

Rural Areas ◽

Electrostatic Interactions ◽

Adsorption Process ◽

Solution Concentration ◽

Order Kinetic ◽

Adsorption Effect ◽

Adsorption Mechanisms ◽

Aqueous Environments ◽

Order Kinetic Model ◽

Pseudo Second Order

Abstract Farming in China’s rural areas leads to antibiotic pollution in waterbodies making it a grave issue. Cotton straw biochar (CSBC) was prepared by oxygen-limited pyrolysis at 400 °C (CSBC400) and 600 °C (CSBC600); and Mn-modified CSBC (MCSBC) was produced by the KMnO4 wrapping method for tetracycline (TC) removal from aqueous solutions. The effects of temperature, initial solution concentration, pH, ion type, and ionic strength on TC adsorption were investigated. The adsorption process of the biochars achieved an equilibrium state after 360 min, and the highest equilibrium adsorption amount (13.254 mg/g) was found for MCSBC. The kinetic adsorption process, which was dominated by chemisorption, was well-described by the pseudo-second-order kinetic model. The adsorption was a non-homogeneous heat absorption process, and the adsorption isotherm data fitting was compatible with the Freundlich model. A better adsorption effect of MCSBC was observed when the pH was < 4. Monovalent cations (Na+, K+, NH4+, and Ca2+) had a facilitative effect on the adsorption process. The adsorption mechanisms of TC by MCSBC included pore diffusion, H bonding, electrostatic interactions, and π–π accumulation. Therefore, MCSBC has a good adsorption capacity for TC and can be used for the treatment of TC-based pollutants in aqueous environments.

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Comparison of the fixation of several metal ions onto a low-cost biopolymer

Water Science & Technology Water Supply ◽

10.2166/ws.2002.0172 ◽

2002 ◽

Vol 2 (5-6) ◽

pp. 217-224 ◽

Cited By ~ 6

Author(s):

Z. Reddad ◽

C. Gérente ◽

Y. Andrès ◽

P. Le Cloirec

Keyword(s):

Aqueous Solutions ◽

Metal Ions ◽

Low Cost ◽

Operating Conditions ◽

Order Kinetic ◽

Adsorption Mechanisms ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Beet Pulp ◽

Removal Of Metal Ions

In the present work, sugar beet pulp, a common waste from the sugar refining industry, was studied in the removal of metal ions from aqueous solutions. The ability of this cheap biopolymer to sorb several metals namely Pb2+, Cu2+, Zn2+, Cd2+ and Ni2+ in aqueous solutions was investigated. The metal fixation capacities of the sorbent were determined according to operating conditions and the fixation mechanisms were identified. The biopolymer has shown high elimination rates and interesting metal fixation capacities. A pseudo-second-order kinetic model was tested to investigate the adsorption mechanisms. The kinetic parameters of the model were calculated and discussed. For 8 × 10-4 M initial metal concentration, the initial sorption rates (v0) ranged from 0.063 mmol.g-1.min-1 for Pb2+ to 0.275 mmol.g-1.min-1 for Ni2+ ions, with the order: Ni2+ > Cd2+ > Zn2+ > Cu2+ > Pb2+. The equilibrium data fitted well with the Langmuir model and showed the following affinity order of the material: Pb2+ > Cu2+ > Zn2+ > Cd2+ > Ni2+. Then, the kinetic and equilibrium parameters calculated qm and v0 were tentatively correlated to the properties of the metals. Finally, equilibrium experiments in multimetallic systems were performed to study the competition of the fixation of Pb2+, Zn2+ and Ni2+ cations. In all cases, the metal fixation onto the biopolymer was found to be favourable in multicomponent systems. Based on these results, it is demonstrated that this biosorbent represents a low-cost solution for the treatment of metal-polluted wastewaters.

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Adsorption Characteristics of Phenol in Aqueous Solution by Pinus massoniana Biochar

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.295-298.1154 ◽

2013 ◽

Vol 295-298 ◽

pp. 1154-1160 ◽

Cited By ~ 3

Author(s):

Guo Zhi Deng ◽

Xue Yuan Wang ◽

Xian Yang Shi ◽

Qian Qian Hong

Keyword(s):

Aqueous Solution ◽

Ph Value ◽

Pinus Massoniana ◽

Isotherm Models ◽

Order Kinetic ◽

Adsorbent Dosage ◽

Salt Ions ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Pseudo Second Order

The objective of this paper is to investigate the feasibility of phenol adsorption from aqueous solution by Pinus massoniana biochar. Adsorption conditions, including contact time, initial phenol concentration, adsorbent dosage, strength of salt ions and pH, have been investigated by batch experiments. Equilibrium can be reached in 24 h for phenol from 50 to 250 mg• L-1. The optimum pH value for this kind of biochar is 5.0. The amount of phenol adsorbed per unit decreases with the increase in adsorbent dosage. The existence of salt ions makes negligible influence on the equilibrium adsorption capacity. The experimental data is analyzed by the Freundlich and Langmuir isotherm models. Equilibrium data fits well to the Freundlich model. Adsorption kinetics models are deduced and the pseudo-second-order kinetic model provides a good correlation for the adsorbent process. The results show that the Pinus massoniana biochar can be utilized as an effective adsorption material for the removal of phenol from aqueous solution.

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Phosphorus removal from aqueous solution using a novel granular material developed from building waste

Water Science & Technology ◽

10.2166/wst.2017.019 ◽

2017 ◽

Vol 75 (6) ◽

pp. 1500-1511 ◽

Cited By ~ 3

Author(s):

Shengjiong Yang ◽

Pengkang Jin ◽

Xiaochang C. Wang ◽

Qionghua Zhang ◽

Xiaotian Chen

Keyword(s):

Granular Material ◽

Chemical Precipitation ◽

Phosphate Removal ◽

Precipitation Process ◽

Order Kinetic ◽

Solution Ph ◽

Experimental Conditions ◽

Removal Capacity ◽

Order Kinetic Model ◽

Pseudo Second Order

In this study, a granular material (GM) developed from building waste was used for phosphate removal from phosphorus-containing wastewater. Batch experiments were executed to investigate the phosphate removal capacity of this material. The mechanism of removal proved to be a chemical precipitation process. The characteristics of the material and resulting precipitates, the kinetics of the precipitation and Ca2+ liberation processes, and the effects of dosage and pH were investigated. The phosphate precipitation and Ca2+ liberation processes were both well described by a pseudo-second-order kinetic model. A maximum precipitation capacity of 0.51 ± 0.06 mg g−1 and a liberation capacity of 6.79 ± 0.77 mg g−1 were measured under the experimental conditions. The processes reached equilibrium in 60 min. The initial solution pH strongly affected phosphate removal under extreme conditions (pH <4 and pH >10). The precipitates comprised hydroxyapatite and brushite. This novel GM can be considered a promising material for phosphate removal from wastewater.

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Studies of Chromium Removal from Tannery Effluents by Dead Streptomyces Rimosus

Chemical Product and Process Modeling ◽

10.2202/1934-2659.1209 ◽

2008 ◽

Vol 3 (1) ◽

Cited By ~ 2

Author(s):

Mohamed Nasser Sahmoune ◽

Krim Louhab ◽

Aissa Boukhiar

Keyword(s):

Fractional Power ◽

Kinetic Studies ◽

Second Order ◽

Order Kinetic ◽

Streptomyces Rimosus ◽

Tannery Effluents ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Ph Range

Dead streptomyces rimosus was found to be an effective biosorbent for the removal of chromium from industrial tanning effluents. A sorption level of 65 mg/g was observed at pH 4.8 while the precipitation effect augmented this value at a higher pH range. Chromium desorption increased with decreasing desorption agents pH (including HCl and H2SO4) to a maximum value of 95% at approximately zero pH. The biosorption data of trivalent chromium by streptomyces rimosus has been used for kinetic studies based on fractional power, Elovich, pseudo-first order and pseudo-second order rate expressions. The time-dependent Cr (III) biosorption data were well-described by a pseudo-second-order kinetic model. The intraparticle diffusion is not the rate-limiting step for the whole reaction. It was found that the biosorption equilibrium data fit well with the Langmuir model.

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Optimization of process parameters for heavy metals biosorption onto mustard waste biomass

Open Chemistry ◽

10.1515/chem-2016-0019 ◽

2016 ◽

Vol 14 (1) ◽

pp. 175-187 ◽

Cited By ~ 25

Author(s):

Lăcrămioara (Negrilă) Nemeş ◽

Laura Bulgariu

Keyword(s):

Heavy Metals ◽

Aqueous Media ◽

Order Kinetic ◽

Waste Biomass ◽

Solution Ph ◽

Biosorption Process ◽

Optimization Of Process Parameters ◽

Removal Of Heavy Metals ◽

Equilibrium Data ◽

Order Kinetic Model

AbstractMustard waste biomass was tested as a biosorbent for the removal of Pb(II), Zn(II) and Cd(II) from aqueous solution. This strategy may be a sustainable option for the utilization of such wastes. The influence of the most important operating parameters of the biosorption process was analyzed in batch experiments, and optimal conditions were found to include initial solution pH 5.5, 5.0 g biosorbent/L, 2 hours of contact time and high temperature. Kinetics analyses show that the maximum of biosorption was quickly reached and could be described by a pseudo-second order kinetic model. The equilibrium data were well fitted by the Langmuir model, and the highest values of maximum biosorption capacity were obtained with Pb(II), followed by Zn(II) and Cd(II). The thermodynamic parameters of the biosorption process (ΔG, ΔH and ΔS) were also evaluated from isotherms. The results of this study suggest that mustard waste biomass can be used for the removal of heavy metals from aqueous media.

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