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The paper is aim to discuss the dye wastewater treatment by sewage sludge-based adsorbent. The adsorbent derived from sewage sludge , which produced through phosphoric acid-microwave method, and commercial activated carbon (ACC) were tested in the process of the Reactive Light Yellow dye wastewater treatment. The effects of pH value, contact time and the adsorbents' amount on the adsorption efficiency...
The modified mesoporous silica with aminopropyl group (NH2-(CH2)3-MCM-41) and chloropropyl group (SH- (CH2)3-MCM-41) and pure mesoporous silica (MCM-41) have been synthesized via the microwave-assisted hydrothermal method. The samples were characterized by X ray diffraction, FT-IR spectroscopy and Nitrogen adsorption-desorption. Then adsorption test of copper ion was investigated. Langmuir model is...
Adsorption of 2, 4, 6-trichlorophenol onto octyl-modified ordered mesoporous silica material from aqueous solution has been investigated systematically using batch experiments in this study. Results indicate that 2, 4, 6-trichlorophenol adsorption is initially rapid and the adsorption process reaches a steady state after 1 min. The adsorption isotherms are well described by the Langmuir and the Freundlich...
The ammonia nitrogen and phosphorus adsorption on natural zeolite were studied. Experimental data shows, the Freundlich and Langmuir models agrees very well with experimental data on ammonium and phosphorus, respectively; Zeolite adsorption of ammonia nitrogen and phosphorus removal process should follow the secondary dynamic equation; In certain concentration range of ammonia nitrogen, zeolite and...
The zeolite was used to treat the groundwater. The various solutions with initial manganese (Mn2+) concentration ranging from 0.5 to 1.5mg/L were prepared in this study. The nature zeolite has cation-exchange capacity and higher absorption capacity for Mn2+ from ground water with 1.89 and 2.69 mg/g at 288 and 298K. Adsorption date were well described by the Langmuir model and the thermodynamic constants...
This paper investigated the adsorption capacities of crushed oyster shells adsorbent for several heavy metal ions removal from synthetic landfill leachate using batch experiments. Adsorbent characterization, single-constituents metal ion adsorption kinetics, single metal adsorption equilibrium isotherm models were assessed. The results showed that: a 24 hour period was considered to provide an adequate...
Study on the adsorption properties of an organic volatile contaminant on residual soil mixed with multi-walled carbon nanotube (MWNT) is presented. The soil samples were thoroughly characterized for their physical chemical properties and composition, particularly organic matter. The adsorption isotherms are well described by both Langmuir and Freundlich models. The result shows that MWNT can be good...
At present the rare earth fertilizer were widely used in agricultural production, there were many researches on the biological effects of rare earth fertilizer. But there were few researches to study the effect of rare earth on the migratory characteristic of heavy mental. Experiments were conducted to study the effect of lanthanum on absorption and desorption of copper in soil. The results showed...
This paper has researched on the adsorption of Cr(VI) in water using peanut shell. The dependence on pH and Cr(VI) concentration of the adsorption was studied. Batch experiments results showed that the adsorptive capacity of peanut shell was 13.39 mg/g of adsorbent. The Langmuir and Freundlich models were used to describe the adsorption equilibrium of Cr(VI) on peanut shell and the adsorption followed...
Rice husk, an agriculture byproduct, was used to adsorb congo red (CR) from aqueous solutions. Variables of the system, including contact time, pH, salt concentration, and equilibrium CR concentration, were adopted to study their effect on CR adsorption. The results showed that when the equilibrium concentration of CR increased, quantity of CR adsorption onto rice husk increased correspondingly. The...
This study attempted to find the adsorption law of fly ash to COD in domestic sewerage. After the elementary characterization of fly ash was described, the influence of contact time, sorbent concentration, and different pretreatment ways of fly ash, initial COD concentration and temperature on the adsorption process was investigated. Results showed adsorption equilibrium attained within 120 min time...
Iron coated zeolite is made and its adsorption characteristics are compared with activated alumina and zero-valent iron to get further understand of the new adsorbent. The results show that iron coated zeolite removes As(V) in the similar with that by activated alumina with removal rate of 50% in first 5min's adsorption but slower after 60 mins' adsorption and faster than that by zero-valent iron...
Aimed at the current situation of nitrogen pollution in groundwater, adsorption characteristics of ammonia-nitrogen onto different lithology named silty sand, silty clay and clay were studied. The results indicated that the process of ammonia-nitrogen adsorption onto soils mainly occurred within 0~2 h, then attended to a dynamic equilibrium. Two kinetic models can describe the experiment data and...
One novel adsorption materials, Mn-loaded iron ore sinter (Mn-IOS), has been conducted to remove arsenate (As (V)) and arsenite (As (III)). The conversion of As (III) to As (V) caused by manganese ion in adsorption progress would be beneficial to adsorption, and therefore, Mn-IOS had a better removal performance of As (III). Results of orthogonal tests suggested that temperature was an important factor,...
This paper has researched on the adsorption of Ni in water using Laminaria japonica and Undaria pinnatifida. The dependence on pH and nickel concentration of the adsorption was studied. Batch experiments results showed that the adsorptive capacity of Laminaria japonica and Undaria pinnatifida was 2.933mg/g and 0.985 mg/g of adsorbent. The Langmuir model was used to describe the adsorption equilibrium...
The Pb(II) biosorption characteristics of Pseudomonas fluorescens PFC02 biomass was examined as a function of initial pH, contact time and initial metal ion concentration. FTIR spectra showed that the principal functional sites taking part in the sorption process included carboxyl , hydroxyl groups and -CH3 stretching groups, the mechanism analysis showed that the chemical chelating was the main adsorption...
Adsorption of p-chloronitrobenzene(pCNB) onto mesoporous molecular sieves (HMS) from aqueous solution has been investigated systematically using batch experiments in this study. Results indicate that p-chloronitrobenzene(pCNB) adsorption is initially rapid and the adsorption process reaches a steady state after 1 minute. The adsorption isotherms are well described by the Langmuir and the Freundlich...
Adsorption is an efficient treatment process for the phosphate removal. In this study, cetyl trimethylammonium bromide modified bentonite (CTMAB-Bent) were prepared, characterized, and its adsorption properties for phosphate were evaluated in batch experiments. The results showed that the ability of phosphate adsorption by CTMAB-Bent was far more than that of Na-bentonite and raw bentonite. The process...
Phosphate removal is important to control eutrophication and adsorption is an efficient treatment process. In this paper, titanium pillared bentonite (Ti-Bent) were prepared, characterized, and its adsorption properties for phosphate were evaluated in batch experiments. The results showed that the significant increase of interlayer spacing, BET surface area and total pore volume all benefited to the...
The removal of Ni(II) from aqueous solution by batch adsorption technique using a zeolite-attapulgite composite nano-size adsorbent was investigated. After elementary characterization of this adsorbent, the influence of adsorbent concentration, initial Ni(II) concentration, pH, contact time and temperature on the selectivity and sensitivity of the removal process were investigated. Results showed...
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