Simultaneous adsorption of phosphate and phosphonate by zirconium-modified biotite: implications for reverse osmosis concentrate treatment

Simultaneous adsorption of phosphate and zinc by lanthanum modified zeolite

Enhanced phosphate removal during the simultaneous adsorption of phosphate and Ni<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si25.gif" display="inline" id="mml25" overflow="scroll"><mml:msup><mml:mrow/><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>from electroless nickel wastewater by calcium silicate hydrate (CSH)

Simultaneous adsorption of phosphate and tetracycline by calcium modified corn stover biochar: Performance and mechanism

STUDY ON SYNTHESIS AND DETERMINATION OF FACTORS AFFECTING PHOSPHATE ADSORPTION ON Zn-Al LAYERED DOUBLE HYDROXIDE MATERIALIn this paper, a layered double hydroxide (LDH) materials with a Zn/Al molar ratio of 2:1 were synthesized successfully by co-precipitation method. Materials were chacracterized by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy/energy dispersive X-ray spectroscopy (FESEM/EDX). The effects of different calcined temperatures, initial phosphate concentrations, contact time, pH values and co-existing on phosphate adsorption were investigated from batch tests. Our results indicate that adsorption capacity of Zn-Al LDH is the best at calcinned temperature of 200oC, the equilibrium time attained within 240 min and the optimal pH was approximately 4. The effect of common coexisting ions including chloride, carbonate, nitrate and sulphate on the simultaneous adsorption of phosphate was in the order of Cl‒ &lt; NO3‒ &lt; SO42‒ &lt; CO32‒.

Various organic and inorganic pollutants co-exist in wastewater, including highly concerning emerging organic pollutants like diclofenac (DCF) and nutrient pollutants like phosphate.

Natural laterite can be regarded as a strong adsorbent due to its special structure and composition. In this study, the laterite was modified by manganese oxide (MnO2) to create a new good adsorbent for treating phosphate and fluoride in water environment. Under the optimized conditions of the adsorbent dose (pH 6, temperature 20°C, and the contact time 180 min), laterite, doped manganese, with diameter of grains from 0.1 to 0.5 mm has maximum adsorption capacity of 31.25 mg/g and 10.99 mg/g for phosphate and fluoride, respectively. The characteristics of the manganese doping laterite were confirmed using various techniques like SEM, BET, XRD, EDX. The adsorption process of the material was investigated by both kinetic models (pseudo-first and second orders) and isotherm models (Freundlich and Langmuir). This new material was tested for treatment of wastewater taken from the superphosphate fertilizer factory, with the results obtained showing high potential for application in reality.

In this work, zirconium chloride octahydrate/CTAB/vetiver grass-activated carbon (ZR/CTAB/VGAC) was prepared from vetiver grass-activated carbon (VGAC), using zirconium chloride octahydrate (ZR) and cetyltrimethylammonium bromide (CTAB) as modifiers. The optimized conditions of the simultaneous phosphate and nitrate removal by ZR/CTAB/VGAC were discussed, including amount of adsorbent, initial concentration, pH, contact time, and temperature. The simultaneous removal efficiency of phosphate and nitrate was 96.50% and 51.17% under optimized conditions. The structural and morphology of ZR/CTAB/VGAC was investigated by using automatic volumetric adsorption analyzer (BET), scanning electron microscopy (SEM), energy dispersive x-ray analysis (EDAX), and Fourier transform infrared spectroscopy (FTIR). It was found that the removal efficiencies of phosphate and nitrate were enhanced dramatically because ZR and CTAB were introduced on the surface of VGAC after modification. Moreover, the adsorption data fitted significantly well with Freundlich isotherm model. It was described well by pseudo-second-order kinetic model. Phosphate and nitrate adsorbed via chemisorption (ion exchange) by ZR, CTAB, and functional groups of the surface of ZR/CTAB/VGAC. Electrostatic adsorption of AC in ZR/CTAB/VGAC also played an important role in the adsorption process. ZR/CTAB/VGAC is an excellent adsorbent, which could be applied to remove nitrate and phosphate from wastewater.

Insights into simultaneous adsorption of orthophosphate (PO43−) and 1-hydroxyethane 1,1-diphosphonic acid (HEDP) by kaolin/lanthanum carbonate composites: Experimental analysis and DFT calculations

Interaction of Cadmium with Phosphate on Goethite

Phosphate adsorption on granular ferric hydroxide to increase product water recovery in reverse osmosis-desalination of secondary effluents

Evaluation of potential adsorbents for simultaneous adsorption of phosphate and ammonium at low concentrations

Efficient simultaneous phosphate and ammonia adsorption using magnesium-modified biochar beads and their recovery performance

Simultaneous adsorption of tetracycline, ammonium and phosphate from wastewater by iron and nitrogen modified biochar: Kinetics, isotherm, thermodynamic and mechanism

Herein, Mg/Al-loaded sludge-based biochar was prepared via electro-assisted impregnation. The structure and chemical analysis of modified sludge-based biochar (MgSBC-0.5(@Al) showed that the material was loaded with MgO and Al2O3. The specific surface area of MgSBC-0.5(@Al) was 11.27 times higher than that of unmodified sludge-based biochar (SBC). The simultaneous adsorption performance of MgSBC-0.5(@Al for ammonia nitrogen (NH4+-N) and phosphate phosphorus (PO43--P) was studied. The maximum adsorption capacities of MgSBC-0.5(@Al for NH4+-N and PO43--P at 298 K were 65.19 and 92.10 mg·g-1, respectively, 4.45 and 6.28 times higher than those of SBC. The external and internal elemental compositions of the modified and unmodified biochar specimens were quantitatively characterized using inductively coupled plasma mass spectrometry, X-ray photoelectron spectroscopy, and X-ray fluorescence spectrometry. The results emphasized the importance of Mg-loading for NH4+-N and PO43--P capture. MgO was mainly loaded on the surface of biochar, enabling adsorption through chemical reactions. Analysis showed that the adsorption of NH4+-N and PO43--P on the modified biochar proceeded simultaneously through multiple mechanisms. Particularly, the adsorption of NH4+-N and PO43--P occurred through the precipitation of struvite and physical adsorption, with PO43--P also adsorbed through the formation of MgHPO4 and CaHPO4. Other data indicated that Al, Ca, and Fe had a trapping effect on the adsorbate. Importantly, the biochar after adsorption could be used as a soil amendment.

ABSTRACTIncineration residues of expired medications (IREMs) were chemically treated (IREM-T) by a combination of mixed salts (CaCl2, MgCl2) and thermal treatments with NaOH. They were characterized and used for simultaneous ammonia and phosphates adsorption from wastewater. Batch experiments were carried out to investigate the effect of contact time, adsorbent dose, initial concentration, pH and temperature. The maximum adsorption capacity for phosphate and ammonium on IREM-T was found to be 24.68 and 34.30 mg g−1, respectively, at the same initial concentration of 50 mg L−1 on 5 g L−1 of IREM-T. Langmuir, Freundlich, Temkin and Dubinin–Radushkevich adsorption models were applied to analyze the adsorption data. The equilibrium data fitted well with the Langmuir isotherm. To examine the adsorption mechanism, pseudo-first-order, pseudo-second-order and intraparticle diffusion models were applied to analyze the experimental data. All the linear correlation coefficients of the second-order model were found to be statistically significant, indicating the applicability of this kinetic equation to the adsorption of both phosphate and ammonium ions. This study revealed that IREM-T has the potential to be an efficient adsorbent for simultaneous nutrient removal. The effectiveness of this material was evaluated by applying this process to Algiers urban wastewater.