scholarly journals Batch studies of phosphonate adsorption on granular ferric hydroxides

2020 ◽  
Vol 81 (1) ◽  
pp. 10-20 ◽  
Author(s):  
T. Reinhardt ◽  
M. Gómez Elordi ◽  
R. Minke ◽  
H. Schönberger ◽  
E. Rott
Keyword(s):  
Contact Time ◽  
Room Temperature ◽  
Adsorption Process ◽  
Ferric Hydroxide ◽  
Batch Experiments ◽  
Batch Studies ◽  
Influence Of Temperature ◽  
Ph Values ◽  
Adsorption Desorption ◽  
Granular Ferric Hydroxide

Abstract Phosphonates are widely used in various industries. It is desirable to remove them before discharging phosphonate-containing wastewater. This study describes a large number of batch experiments with adsorbents that are likely suitable for the removal of phosphonates. For this, adsorption isotherms for four different granular ferric hydroxide (GFH) adsorbents were determined at different pH values in order to identify the best performing material. Additionally, the influence of temperature was studied for this GFH. A maximum loading for nitrilotrimethylphosphonic acid (NTMP) was found to be ∼12 mg P/g with an initial concentration of 1 mg/L NTMP-P and a contact time of 7 days at room temperature. Then, the adsorption of six different phosphonates was investigated as a function of pH. It was shown that GFH could be used to remove all investigated phosphonates from water and, with an increasing pH, the adsorption capacity decreased for all six phosphonates. Finally, five adsorption–desorption cycles were carried out to check the suitability of the material for multiple re-use. Even after five cycles, the adsorption process still performed well.

scholarly journals Removal of Cr(VI) from Aqueous Environments Using Micelle-Clay Adsorption

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Mohannad Qurie ◽  
Mustafa Khamis ◽  
Adnan Manassra ◽  
Ibrahim Ayyad ◽  
Shlomo Nir ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Removal Efficiency ◽  
Continuous Flow ◽  
Contact Time ◽  
Langmuir Adsorption Isotherm ◽  
Optimal Conditions ◽  
Batch Experiments ◽  
Langmuir Adsorption ◽  
Ph Values ◽  
Aqueous Environments

Removal of Cr(VI) from aqueous solutions under different conditions was investigated using either clay (montmorillonite) or micelle-clay complex, the last obtained by adsorbing critical micelle concentration of octadecyltrimethylammonium ions onto montmorillonite. Batch experiments showed the effects of contact time, adsorbent dosage, and pH on the removal efficiency of Cr(VI) from aqueous solutions. Langmuir adsorption isotherm fitted the experimental data giving significant results. Filtration experiments using columns filled with micelle-clay complex mixed with sand were performed to assess Cr(VI) removal efficiency under continuous flow at different pH values. The micelle-clay complex used in this study was capable of removing Cr(VI) from aqueous solutions without any prior acidification of the sample. Results demonstrated that the removal effectiveness reached nearly 100% when using optimal conditions for both batch and continuous flow techniques.

scholarly journals Pengaruh pH Ekstraksi pada Pewarnaan Batik Sutera Menggunakan Pewarna Alami Kulit Kayu Mahoni (Switenia Mahagoni)

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Dwi Wiji Lestari ◽  
Vivian Atika ◽  
Isnaini Isnaini ◽  
Agus Haerudin ◽  
Tin Kusuma Arta
Keyword(s):  
Room Temperature ◽  
Natural Dye ◽  
Alkaline Ph ◽  
Influence Of Temperature ◽  
Ph Values ◽  
Influence Of Temperature On ◽  
Good Scale ◽  
Swietenia Mahagoni

The natural dye extracted from Swietenia mahagoni was applied to silk batik. Mahagoni bark is known to contain dyestuff components such as flavonoids and tannins. The dye compound was extracted using water at pH values of 6 (original pH extract), pH 2 (acid), and pH 12 (base) at 100 °C for 1 hour. Variation of extraction pH values was carried out to determine the influence of temperature on the results of the extract. Batik dyeing was carried out at room temperature using dye products. The pre-mordanting and post-mordanting used were alum (Al2(SO4)3.K2SO4.24H2O). The results showed that the dye product extracted in alkaline pH shows a high amount of tannins and flavonoids and the ability to color the silk batik better. The color direction is reddish-brown. The pH values of extraction do not affect the results of the colorfastness to washing test, which is on 4-5 (good) scale. A B S T R A KPewarna alami yang diekstrak dari mahoni (Swietenia mahagoni) diaplikasikan pada kain batik sutra. Kulit kayu mahoni diketahui mengandung komponen zat warna berupa flavonoid dan tanin. Komponen zat warna diekstraksi menggunakan air pada pH 6, pH 2 (asam) dan pH 12 (basa) pada suhu 100 °C selama 1 jam. Variasi pH ekstraksi dilakukan untuk mengetahui pengaruhnya terhadap hasil ekstrak. Pewarnaan dilakukan pada suhu ruang menggunakan pewarna hasil ekstraksi. Mordan awal dan mordan akhir yang digunakan adalah tawas (Al2(SO4)3.K2SO4.24H2O). Ekstraksi pada pH basa terbukti meningkatkan jumlah zat tanin dan flavonoid yang terekstrak dan mampu mewarnai kain batik sutra dengan lebih baik. Arah warna yang dihasilkan adalah cokelat kemerahan. Derajat keasaman (pH) ekstraksi tidak berpengaruh pada hasil uji ketahanan luntur warna terhadap pencucian, yaitu skala 4-5 (baik).

scholarly journals Studies on desorption and regeneration of natural pumice for iron removal from aqueous solution

2018 ◽  
Vol 2017 (2) ◽  
pp. 509-515 ◽  
Author(s):  
S. Indah ◽  
D. Helard ◽  
A. Binuwara
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Contact Time ◽  
Adsorption Process ◽  
Iron Removal ◽  
Iron Ions ◽  
The Third ◽  
Environmental Friendly ◽  
West Sumatra ◽  
Adsorption Desorption

Abstract To make the adsorption process more economic and environmental friendly, it is necessary to study desorption and reutilization of the adsorbents. In the present study, the effectiveness of natural pumice in removal of iron from aqueous solution was investigated in several sorption-desorption cycles. The desorption characteristics of previously adsorbed iron ions on natural pumice were tested by various desorbing agents such as HCl, NaOH and aquadest. Among them, HCl showed the highest desorption efficiency (37.89%) with 0.1 M of concentration and 60 min of contact time. The removal efficiency of iron ions in reused natural pumice could be maintained up to 90% in the third cycle of adsorption. The results indicate that although complete desorption was not achieved, natural pumice from Sungai Pasak, West Sumatra, Indonesia, can be sufficiently reused up to three cycles of adsorption-desorption.

scholarly journals Methylene Blue Adsorption from aqueous solution by low cost vine-wood biomass

2021 ◽  
Author(s):  
Rachida Souidi ◽  
yasmina khane ◽  
Lahcen Belarbi ◽  
Smain Bousalem
Keyword(s):  
Methylene Blue ◽  
Sulfuric Acid ◽  
Contact Time ◽  
Adsorption Process ◽  
Low Cost ◽  
Sulfuric Acid Concentration ◽  
Analytical Techniques ◽  
Batch Adsorption ◽  
Adsorbent Dosage ◽  
Adsorption Desorption

Abstract In this work, the sawdust of vine wood (VW) was treated with sulfuric acid and used to adsorb methylene blue (MB) from aqueous solutions via a batch adsorption process. The characteristics of the adsorbent were determined by various analytical techniques such as Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM) and Brunauer−Emmett−Teller (BET) N2 adsorption−desorption isotherms. The effects of various experimental parameters including sulfuric acid concentration, particle size of the adsorbent, pH of the solution, contact time, initial concentration, adsorbent dosage and temperature on adsorption of MB by activating sawdust were systematically investigated. The experimental results showed that the adsorption efficiency was increased with contact time and adsorbent dosage. The maximum removal efficiency was found after 180 min of solid/liquid contact with adsorbent doses of 1 g/l for sawdust. The isotherm and kinetic experimental data for MB adsorption on VW sawdust were best-fitted by Langmuir models and Pseudo-second-order, respectively. The calculated values of the entropy (ΔS°), enthalpy (ΔH°) and Gibbs energy (ΔG°) indicated that the adsorption process was exothermic in nature. These results suggest that the activated sawdust can be employed as a low-cost and environmentally friendly adsorbent for the treatment of wastewaters containing dyes.

scholarly journals Biosorption of Lead and Cadmium Ions on the Green Parts of Daucus Carota

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Martin MUCHA
Keyword(s):  
Daucus Carota ◽  
Contact Time ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Infrared Spectrometry ◽  
Adsorptive Removal ◽  
Ph Values ◽  
Lead And Cadmium ◽  
Adsorption Capacities ◽  
Stems And Leaves

This study deals with utilization of milled stems and leaves of carrot (Daucus carota) for the adsorptive removal of Pb(II) and Cd(II)from the aqueous solution. Carrot was bought in the local grocery, it was dried at the laboratory temperature and milled. Preparedmaterial was analysed by the infrared spectrometry which confirms good structural homogeneity of the sample. Kinetic measurementswere performed for estimation of adsorption equilibrium time. Equilibrium of Pb(II) adsorption was established after 6 hours of contact time, equilibrium of Cd(II) adsorption was established after 24 hours of contact time. The isotherms’ measurements were realizedwith the contact time 24 hours for the estimation of adsorption capacities of the studied sorbent. Adsorption capacities were around47 mg/g for Cd(II) and 154 mg/g for Pb(II). Changes of pH values of the sorption solutions were negligible but some amount of Ca(II),Mg(II), K(I) and Na(I) ions was released to the solution during adsorption process. Daucus carota stems and leaves exhibit good sorption capacities and they could be utilized for adsorptive removal of Pb(II) and Cd(II) ions from the aqueous solutions.

Bentonite-Biochar Combination for Manganese Ion Removal from Water

2021 ◽  
Vol 1162 ◽  
pp. 81-86
Author(s):  
Yasdi Yasdi ◽  
Rinaldi Rinaldi ◽  
Wahyu Fajar Winata ◽  
Febri Juita Anggraini ◽  
Ika Yanti ◽  
...  
Keyword(s):  
Contact Time ◽  
Metal Ion ◽  
Room Temperature ◽  
Adsorption Process ◽  
Quality Standard ◽  
Ion Concentration ◽  
Optimum Conditions ◽  
Manganese Ion ◽  
Ion Removal ◽  
Optimum Ph

Peat waters were abundant in the West Tanjung Jabung Regency of Jambi Province. Peat water contains manganese metal ion concentration that exceeds the clean water quality standard. Previous studies have been conducted to reduce levels of manganese in peat water, but the results have not been significant. This study aims to reduce levels of Manganese metal in peat water using the composition of Bentonite and Biochar. The adsorption process was carried out at room temperature (29 °C) with a stirring of 200 rpm. Some parameters measured were optimum pH of adsorption, optimum contact time and the best combination between Bentonite and Biochar. Manganese ion concentration in solution was measured using atomic absorption spectroscopy (AAS). The results of this study indicate that the optimum conditions for removing manganese ion at pH 5 and contact time 40 minutes. Tests on artificial solutions using 0.2 grams of biochar showed Mn ion removal of 42.91% (C0 = 100 mg/L, Ce = 57.09 mg/L, V = 100 mL). The best combination obtained in Bentonite: Biochar (1:2) with a mass of 0.080 gr and 0.170 gr, respectively, which able to remove 91.29% manganese ions in peat water.

Adsorption of sunset yellow FCF from aqueous solution by chitosan-modified diatomite

2015 ◽  
Vol 72 (10) ◽  
pp. 1861-1868 ◽  
Author(s):  
Y. Z. Zhang ◽  
J. Li ◽  
W. J. Li ◽  
Y. Li
Keyword(s):  
Contact Time ◽  
Pore Diameter ◽  
Adsorption Process ◽  
Dye Adsorption ◽  
Sunset Yellow ◽  
Experimental Conditions ◽  
Average Pore ◽  
Experimental Values ◽  
Adsorption Desorption ◽  
Optimized Conditions

Sunset yellow (SY) FCF is a hazardous azo dye pollutant found in food processing effluent. This study investigates the use of diatomaceous earth with chitosan (DE@C) as a modified adsorbent for the removal of SY from wastewater. Fourier transform infrared spectroscopy results indicate the importance of functional groups during the adsorption of SY. The obtained N2 adsorption–desorption isotherm values accord well with IUPAC type II. Our calculations determined a surface area of 69.68 m2 g−1 for DE@C and an average pore diameter of 4.85 nm. Using response surface methodology, optimized conditions of process variables for dye adsorption were achieved. For the adsorption of SY onto DE@C, this study establishes mathematical models for the optimization of pH, contact time and initial dye concentration. Contact time plays a greater role in the adsorption process than either pH or initial dye concentration. According to the adjusted correlation coefficient (adj-R2 > 0.97), the models used here are suitable for illustration of the adsorption process. Theoretical experimental conditions included a pH of 2.40, initial dye concentration of 113 mg L−1 and 30.37 minutes of contact time. Experimental values for the adsorption rate (92.54%) were close to the values predicted by the models (95.29%).

scholarly journals Al (III) removal from wastewaters by natural clay and coconut shell

2019 ◽  
Keyword(s):  
Aqueous Solutions ◽  
Contact Time ◽  
Acid Treatment ◽  
Adsorption Process ◽  
Coconut Shell ◽  
Maximum Adsorption Capacity ◽  
Agitation Rate ◽  
Batch Experiments ◽  
Natural Clay ◽  
Initial Ph

<p>This paper describes the adsorption of Al3+ ions from aqueous solutions, by natural clay (from Sakarya's Yenigün district) and coconut shell modified by means of acid treatment. Batch experiments were carried out to determine the effect of various factors such as initial pH (4-9), temperature (20, 40, 70 oC), initial concentration (10 to 200 mg L-1) and contact time (1-120 minute) on the adsorption process. The adsorption experiments were performed at a temperature of 20 ±2 oC), at 200 rpm agitation rate, with an adsorbent level of 1 g L-1, produced 98.95% (at pH 6) and 92.83% (at pH 7) maximum Al3+ removal efficiency for clay and coconut shell based adsorbents respectively. Furthermore, the process was found to be exothermic for clay and endothermic for coconut. XRF and XRD analyses of the clay variety used in adsorption analyses revealed it to be saponite clay, within the larger group of smectite clay minerals. The application of Langmuir revealed maximum adsorption capacity of 149.25 mg g-1 for natural clay adsorbent (NCA), and 120.482 mg g-1 for coconut shell adsorbent (CSA). Moreover, adsorption kinetics were found to be consistent with the second order kinetics (R2 &gt; 0.95). The result shows that, natural clay and coconut shell adsorbents are effective adsorbents to remove Al3+ from aqueous solutions with good adsorption rate (&gt;92.8%).</p>

scholarly journals Chromium (VI) removal from aqueous solutions using Eichhornia as an adsorbent

2016 ◽  
Vol 7 (4) ◽  
pp. 461-467 ◽  
Author(s):  
Neetu Rani ◽  
Bhupender Singh ◽  
Tuisem Shimrah
Keyword(s):  
Contact Time ◽  
Industrial Wastewater ◽  
Eichhornia Crassipes ◽  
Room Temperature ◽  
Adsorption Process ◽  
Batch Process ◽  
Optimum Dose ◽  
First Order ◽  
Chromium Vi ◽  
Optimum Ph

The study was carried out to check the potential of water hyacinth, Eichhornia crassipes, to remove chromium (VI) in batch process. Powder was prepared from dried Eichhornia (particle size 0.3 mm and 1.0 mm). The influence of various parameters on adsorption (pH, dose, contact time, temperature) was studied. The Cr(VI) removal was 60.9% and 79.2% for 1.00 mm and 0.3 mm particles of Eichhornia treated (ET) after 30 min contact time and 52.7% and 53.4% for 1.00 mm and 0.3 mm particles of Eichhornia untreated (EU) after 75 min contact time respectively. The optimum pH for both adsorbents was found to be 2.0 and optimum dose was found to be 0.4 g 100 ml−1 for ET and 0.6 g 100 ml−1 for EU. Maximum adsorption occurred at room temperature (26 ± 1°C) in case of both ET and EU, respectively. The adsorption process followed the first order mechanism as well as the Langmuir isotherm. Finally, it was concluded that the adsorbent prepared from Eichhornia is very effective in removing Cr(VI) and it can be used for industrial wastewater treatment.

scholarly journals PHOSPHORUS REMOVAL FROM IRAQI TREATED WASTEWATER USING ALUM SLUDGE

2021 ◽  
Vol 25 (Special) ◽  
pp. 3-203-3-212
Author(s):  
Aseel M. Alwan ◽  
◽  
Mohammad Ali Rashid ◽  
Keyword(s):  
Removal Efficiency ◽  
Phosphorus Removal ◽  
Contact Time ◽  
Room Temperature ◽  
Adsorption Process ◽  
Treatment Plant ◽  
Treated Wastewater ◽  
Small Particles ◽  
Phosphorous Removal ◽  
Alum Sludge

Phosphorus is one of the most important nutrients affecting the eutrophication, so its treatment is the most important thing that must be taken before wastewater is dumped into water bodies. This paper presents a study on phosphorous removal by adsorption with oven-dried-alum-sludge (ODAS) that was collected from Baqubah treatment plant (Iraq) and preheat at 105 ° C, cool down at room temperature, and crushed into small particles of (0.8-5) mm. The effect of ODAS studied with doses of 1.25-20 g/l and found that the higher the dose of adsorbent, the higher the percentage of phosphorous removal. Contact time also studied its effect on phosphorous removal and found that it has a clear effect on the adsorption process, as the percentage of phosphorous removal efficiency increased with increasing contact time. The optimum dosage of ODAS was 10 g/l and contact time 180 min with phosphorous removal efficiency (98%, 99%, 97%, and 97%) for initial concentration of (5, 10, 15, and 20) mg/l of phosphorus.

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