water adsorption Articles
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Ammonium adsorption by tidal flat surface sediments from the Yangtze Estuary
Ammonium adsorption by sediments plays an important role in the cycle of nitrogen in the estuarine tidal flat ecosystem. Ammonium adsorption on tidal flat sediments from the Yangtze estuary was studied using the simulation experiment. The findings indicated that there was linear adsorption by the tidal flat sediments for the lower ammonium concentration (<10 mM) in the overlying waters. The ...
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Removal of chromium(III) from water samples by a low-cost sorbent: application to a mixture of chromium(III) and chromium(VI)
Adsorption of Cr(III) and Cr(VI) ions from aqueous solutions and water samples has been investigated using Powdered Marble Waste (PMW). The effect of solution pH, initial metal concentration, sorbent dose, shaking time, temperature, and foreign ions on the adsorption of Cr(III) was studied. It was found that the sorption capacity increased with the increase of Cr(III) concentration and ...
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Aeration and Stripping
Aeration in the treatment of water is a process that is used for either of two purposes: either to add oxygen (or possibly another gas) to water (adsorption) or to remove an unwanted gas from water (desorption or stripping). It follows that aeration is most likely to be encountered in the treatment of ground waters. Aeration can be carried out in a variety of ways. The most appropriate ...
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Adsorption of azo dyes from aqueous solution by the hybrid MOFs/GO
In this work, a hybrid of chromium(III) terephthalate metal organic framework (MIL-101) and graphene oxide (GO) was synthesized and its performance in the removal of azo dyes (Amaranth, Sunset Yellow, and Carmine) from water was evaluated. The adsorption for azo dyes on MIL-101/GO was compared with that of MIL-101, and it was found that the addition of GO enhanced the stability of MIL-101 in ...
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AquaGate+Organoclay Installation Profile
This article provides an overview of an installation of AquaGate+Organoclay material to reduce sheens at a historic MGP site. AquaGate+Organoclay provides the abiltiy to place a powder organoclay through the water, in direct contact with contaminants in sediment. Organoclay is a well known and documented material used in the oil & gas industry for adsorption of hydrocarbon-based ...
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Moisture-sorption isotherms of Bambara nut and Tiger nut
Moisture sorption characteristics of Bambara nut [Voandzeia subcerranea (L.) thouars] and Tiger nut (Cyperus esculentus L.) were investigated at 34°C and 0.10-0.98 water activity. Both the adsorption and desorption modes for the nuts followed the Brunauer-Emmet-Teller (BET) Type 2 model. Five moisture sorption models, namely Bradley, Smith, Henderson, BET and GAB (Guggerhein-Anderson-de Boer) ...
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Biosorption of lead by the immobilised fungus Phanerochaete chrysosporium in a packed bed column
Biosorption of lead by immobilised Phanerochaete chrysosporium over two successive cycles of sorption-desorption was investigated in a continuously operated packed bed column. The breakthrough curves in each sorption cycle were measured as a function of different bed depths in the column at an inlet lead concentration of 40 mg/L. The values of various breakthrough parameters obtained in the study ...
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Nitrate removal from natural water by coupling adsorption and Donnan dialysis
A hybrid adsorption/Donnan dialysis (DD) process for nitrate removal using PUROLITE A520E resin as an adsorbent was investigated in this work. PUROLITE resin was introduced into the DD process due to its good selectivity adsorption for nitrate and widespread availability. This study was conducted in order to benefit from each process, and it was an original and new combination. The retention ...
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Sensitive quantification of trace zinc in water samples by adsorptive stripping voltammetry
A simple and sensitive adsorptive stripping voltammetry method was developed for determination of Zn using N-nitrozo-N-phenylhydroxylamine (cupferron) as a selective complexing agent. This complex absorbed on the hanging mercury drop electrode and created a sensitive peak current. The peak current and concentration of zinc accorded with a linear relationship in the range of 0.85–320 ng ...
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The effect of co-existing solutes on arsenate removal with hydrotalcite compound
Hydrotalcite (HTAL-Cl), an inorganic anion exchanger, is of use as an adsorbent for the removal of arsenate (As(V)) in water systems. The adsorption properties of HTAL-Cl for As(V) and the effects of co-existing anions on the As(V) removal performance were investigated in this work. Under the conditions of pH≥4, the adsorption capacity for As(V) gradually decreased with an increase of pH, but ...
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Arsenic removal from groundwater by ion exchange and adsorption processes: comparison of two different materials
Among the different technologies for reducing arsenic concentration in drinking water, adsorption has demonstrated in many cases to be superior in terms of performance and costs. However, there are numerous types of commercial adsorbents potentially capable of treating arsenic-contaminated groundwater. The present paper compares arsenic uptake efficiency of two different commercial media, one ...
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Modelling resorcinol adsorption in water environment using artificial neural network
The application of Artificial Neural Network (ANN) for the prediction of removal efficiency of resorcinol in water environment using low-cost carbonaceous adsorbents such as rice husk ash was studied in the present investigation. The input data used for training of the ANN model include adsorbent dose, adsorbate concentration, time of contact and pH. The various input variables were obtained in a ...
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Study on cement mortar and concrete made with sewage sludge ash
This study investigated the feasibility of reusing wastewater sludge ash in construction materials to replace partial materials. Wastewater sludge sampled from thermal power plant was burned into sludge ash at 800°C in the laboratory. The sludge incineration ash has low heavy metal including Pb, Cd, Cr and Cu, so it belongs to general enterprise waste. The chemical composition of sludge ...
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Study of equilibrium and kinetic models for removal of chromium (VI) and lead (II) by modified feather by H 2 O 2
Heavy metals are sorely toxic for the environment and human. In this study, the ability of feather for sorption chromium and lead from aqueous solution was investigated. All the experiments were carried out in a batch system. For this aim, the effect of various parameters such as pH, temperature, contact time, dosage sorbent and initial concentration were investigated. Results showed that ...
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Review of fluoride removal from water by adsorption using soil adsorbents – an evaluation of the status
The fate of excessive fluoride in water is cause for serious public health concerns worldwide. Water defluoridation using various technologies therefore continues to attract disproportionate research interest from around the world. Defluoridation studies using soil adsorbents, in particular, have remained the focus of intense research efforts since the last few decades. So as to assess the ...
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(x)ZnO(1 − x)Fe2O3 nanocrystallines for the removal of cadmium(II) and nickel(II) from water: kinetic and adsorption studies
In this work the efficiency of mechanically prepared magnetic (x)ZnO(1 − x)Fe2O3 nanocrystallines for Ni(II) and Cd(II) ions removal was investigated. The produced nanoparticles were characterized using N2 adsorption, X-ray diffraction (XRD), and magnetization techniques. Batch mode experiments were performed to evaluate the parameters of the heavy metal ions adsorption on the nanoparticles. ...
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Rapid removal of heavy metal ions from aqueous solutions by low cost adsorbents
In the present investigation, different agricultural solid wastes namely: eggplant hull (EH), almond green hull (AGH), and walnut shell (WS), that are introduced as low cost adsorbents, were used for the removal of heavy metals (cobalt, strontium and mercury ions) from aqueous solutions. Activation process and/or chemical treatments using H2O2 and NH3 were performed on these raw materials to ...
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MCM’s heated Silicon Sensor Moisture Analyser against Aluminium Oxide and Oscillating Crystal Moisture Analysers, during Molecular Sieve Test Runs at St Fergus, Scotland
Abstract Methods for dehydrating natural gas using molecular sieves (mol sieve) are well established. Many strategies have been developed with the intention of extending mol sieve lifetime and preventing unplanned shut-downs of dehydration units. The amount of adsorbent required in such dehydration processes is determined by the water content in the feed, the end-of-run (EOR) water adsorption ...
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Simultaneous determination of trace lead and cadmium in water samples by adsorptive stripping voltammetry using gallic acid as a selective chelating agent
This work describes a procedure for the simultaneous determination of cadmium and lead in some food and water samples using an adsorptive stripping voltammetric method. The method is based on the adsorptive accumulation of 2,3,4-trihydroxybenzoic acid (gallic acid (GA)) complexes of these elements onto a hanging mercury drop electrode, followed by the reduction of the adsorbed species. ...
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Fluoride removal from drinking water by adsorption using bone char as a biosorbent
As a biomass material, bone char was investigated for the feasibility to be used as a cost-effective biosorbent for fluoride removal from drinking water in groundwater environment. Based on the batch tests with natural tourmalin and active alumina being the reference adsorbents, bone char has demonstrated a higher fluoride adsorption capacity. This capacity was found to increase with the increase ...
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