活性炭-凹凸棒复合滤料对水中DBP的吸附研究

用活性炭-凹凸棒复合滤料吸附水中邻苯二甲酸二丁酯（DBP）,考察了滤料投加量,吸附时间, DBP初始浓度,溶液初始pH和温度的影响,研究了活性炭-凹凸棒复合滤料对DBP的吸附等温线,探讨了该滤料吸附DBP的可行性。结果表明,在温度25℃,pH9,振荡时间12h的条件下,0.5g活性炭-凹凸棒滤料可使100mL浓度为5mg·L-1的DBP去除率达94%以上。25℃下的活性炭-凹凸棒滤料的饱和吸附量为1.75mg·g-1。吸附过程包括化学吸附和物理吸附,符合Langmuir等温吸附方程和伪二级动力学方程。实验证明活性炭-凹凸棒复合滤料是吸附去除水中邻苯二甲酸二丁酯的有效方法。     

凹凸棒活性炭复合滤料对刚果红的吸附性能研究

文章以凹凸棒活性炭复合滤料处理原水中的刚果红,探讨了滤料投加量、吸附时间、温度、pH及原水初始浓度等因素对刚果红去除处理效果的影响。实验结果表明,25℃时,在中性50 mg/L的刚果红溶液中,振荡60 min,凹凸棒活性炭复合滤料对刚果红溶液的吸附可达平衡。凹凸棒活性炭复合滤料作为吸附剂处理含刚果红废水,是一种有效的方法。     

凹凸棒复合滤料对水中Ni^2＋的吸附研究

通过静态吸附实验,研究了凹凸棒复合滤料对水中Ni^2＋的吸附性能,探讨了滤料投加量、吸附时间、pH值、反应温度、初始浓度等对Ni^2＋吸附效果的影响。实验结果表明,凹凸棒复合滤料对水中Ni^2＋的吸附率随溶液pH值和温度的升高而升高,吸附反应在120 min左右达到平衡,吸附率最高可达99.5%,吸附过程符合Langmuir吸附模型。凹凸棒复合滤料通过再生后可以反复使用。     

凹凸棒复合滤料对氨氮的静态吸附研究

文章通过静态吸附实验,研究了凹凸棒复合滤料对氨氮的吸附性能,探讨了吸附时阅,氨氮初始浓度,pH,温度等因素对吸附效果的影响。实验结果表明,吸附在60min达到平衡,吸附动力学过程遵循准二级动力学模型,吸附等温线符合Freundlich方程,吸附率在pH=2-6时较高,并且随着温度的升高而升高。     

硅藻土凹凸棒复合滤料吸附亮绿染料的性能

本研究以硅藻土和凹凸棒为主要原料合成复合滤料,并将其用于吸附处理亮绿染料.实验研究了pH值、接触时间、温度及初始浓度对复合滤料吸附亮绿染料效果的影响,并对吸附饱和后的复合滤料进行再生实验.结果表明,碱性溶液环境有利于吸附率的提高,最佳吸附pH值确定为7,复合滤料吸附亮绿染料在2h左右可达平衡,吸附属于放热反应,亮绿初始浓度增加造成亮绿去除率下降,硅藻土凹凸棒复合滤料通过超声波酸溶液振荡再生后具有良好的重复利用率.该滤料对于去除水中亮绿染料具有一定的实际应用价值.     

凹凸棒土烧结滤料对酸性红88吸附性能研究

以凹凸棒土烧结滤料为吸附剂,研究了pH、酸性红浓度、滤料投加量、吸附时间、吸附温度对酸性红88吸附效果的影响。拟合了吸附等温线,并讨论了热力学与动力学的性质。结果表明,伪二级动力学模型能很好的描述动力学规律,计算得ΔG为负值,吸附过程自发进行。滤料投加量0.2 g,吸附温度30℃,pH为3,吸附时间为12 h时吸附效果较好。此条件下对25 mg/L的酸性红88去除率达到93.17%。     

凹凸棒复合滤料生物过滤去除苯酚性能研究

利用凹凸棒复合滤料良好的吸附性和生物挂膜性能对普通滤池进行生物强化,研究生物过滤对原水中苯酚的去除效果及影响因素。实验结果表明,原水浓度在0.25mg/L时,苯酚的去除率达到93.75%;温度在23℃时,苯酚的去除率达到95.97%;原水溶解氧浓度在7.4mg/L时,苯酚的去除率达到96.46%;反冲洗对生物过滤去除苯酚的影响较小,去除率在冲洗2h后能够恢复到冲洗前的水平。     

凹凸棒复合吸附剂对苯酚的吸附研究

通过静态实验,研究了凹凸棒复合吸附剂对苯酚的吸附性能和影响吸附效果的相关因素.实验结果表明,凹凸棒复合吸附剂对苯酚的吸附过程遵循准二级动力学模型,吸附等温线符合Langmuir方程,温度和pH变化对吸附行为没有显著影响,吸附为放热的物理吸附过程.吸附剂再生后可以反复使用.     

微波改性凹凸棒滤料对微污染苯酚废水动态吸附研究

以十六烷基三甲基溴化铵(CATB)改性凹凸棒土对微污染废水中苯酚及其再生后吸附效果作了动态试验,研究了去除苯酚的动力学特征。结果表明,凹凸棒滤料经CATB改性后在动态试验过程中对微污染水中苯酚具有较强的吸附能力,苯酚的去除率随着废水流速的减少而增大,在pH为6～8,废水中苯酚质量浓度为17.74 mg/L,流速为2 m/s,吸附时间25 min条件下,吸附去除率达93.07%;改性后的凹凸棒滤料可用碱进行再生,再生后对苯酚的吸附能力没有明显下降;苯酚的动态吸附过程遵循一级反应动力学模型。     

凹凸棒土滤料对浓缩液中镍离子的吸附研究

考察了一种新型凹凸棒土滤料对Ni~(2+)的吸附性能。以吸附量、吸附率为评价指标,探究了吸附剂粒径、吸附剂投加量、pH值、温度对吸附效果的影响;通过在不同温度下拟合吸附等温线,研究凹凸棒土滤料对Ni~(2+)的吸附作用。实验结果表明,当吸附剂为粉末状,投加量为0.5 g, pH值在5～6之间时,凹凸棒土滤料对Ni~(2+)的吸附率达到93.7%,且温度越高,平衡吸附量越大;Ni~(2+)吸附过程更符合准二级动力学方程;等温吸附过程更符合Freundlich模型。     

活性炭纤维对水溶液中醋酸丁酯的吸附性能研究

研究了以活性炭纤维为吸附剂从水溶液中吸附醋酸丁酯的吸附静力学、动力学规律及动态吸附特性。实验表明，活性炭纤维对醋酸丁酯的吸附量较大，吸附速度快，动态吸附、脱附性能好。该方法可行，具有一定的实用价值。     

Adsorption of Gallic Acid from Aqueous Solution Using Fixed Bed Activated Carbon Columns

Naturally occuring matter (NOM), a heterogeneous mixture of complex organic compounds, is invariably present in all surface and ground waters. These materials act as substrate for the growth of bacteria in the distribution system. The disinfection of such water by chlorination produces disinfection by products consisting of several halogenated compounds which are toxic and carcinogenic. As gallic acid is the building block of most NOM, its adsorptive removal from water has been studied using activated carbon columns. The operating variables studied are the hydraulic loading rate (HLR), bed depth (Z), and the feed concentration (C_o). The breakthrough curves are S-shaped and the breakthrough time increases with increasing Z and decreases with increasing HLR and C_o. The adsorption increases with increasing HLR and is maximum around HLR = 8 m³/hr/m². The column design parameters such as the critical bed depth and the depth of the mass transfer zone (MTZ) as calculated using the bed depth service time (BDST) approach are found to agree fairly closely with the experimental values. MTZ is smaller for the carbon cloth indicating its better adsorption characteristics. The adsorption column parameters such as the treated volume and the mass of the carbon required for a desired effluent concentration have been determined from the column data.     

Adsorption of Furfural from Aqueous Solution onto Activated Carbon: Kinetic,Equilibrium and Thermodynamic Study

Abstract

The present study aims to evaluate the influence of various experimental parameters viz. initial pH (pH ₀), adsorbent dose, contact time, initial concentration and temperature on the adsorptive removal of furfural from aqueous solution by commercial grade activated carbon (ACC). Optimum conditions for furfural removal were found to be pH ₀ ≈ 5.9, adsorbent dose ≈ 10 g/l of solution and equilibrium time ≈ 6.0 h. The adsorption followed pseudo‐second‐order kinetics. The effective diffusion coefficient of furfural was of the order of 10^?13 m²/s. Furfural adsorption onto ACC was found to be best represented by the Redlich‐Peterson isotherm. A decrease in the temperature of the operation favorably influenced the adsorption of furfural onto ACC. The positive values of the change in entropy (ΔS ⁰); and the negatived value of heat of adsorption (ΔH ⁰) and change in Gibbs free energy (ΔG ⁰) indicated feasible, exothermic, and spontaneous nature of furfural adsorption onto ACC.     

Adsorption Kinetics of Fluroxypyr Herbicide in Aqueous Solution onto Granular Activated Carbon

Fluroxypyr is a widely used herbicide whose presence in natural waters has prompted research into its removal by adsorption. This article reports a kinetics study of fluroxypyr adsorption on a commercial activated carbon. The experimental study used a micro differential column batch reactor operated at three solution flow rates and two initial fluroxypyr concentrations, establishing a differential regime in order to obtain correct experimental data. Initial rates at zero coverage permitted the external transfer coefficient k _L to be calculated. Internal surface diffusion coefficients D _S were determined by using the Homogeneous Surface Diffusion Model running the FAST software and taking advantage of tabulated user-oriented solutions. This model satisfactorily fits the experimental data. D _S values were 2.5 × 10^?14 and 4.2 × 10^?14 m² s^?1 for initial concentrations of 30 and 50 mg/L, respectively. These values were confirmed by experiments in a widely used shaken batch reactor with a determined k _L value.     

Phosphate Removal from Aqueous Solution Using Coir-Pith Activated Carbon

The present study deals with the removal of phosphates from aqueous solution using activated carbon developed from coir pith. Batch adsorption experiments were performed to delineate the effect of initial pH, contact time, adsorbent dose and temperature on the removal of phosphates by coir-pith activated carbon (CAC) (activated by H₂SO₄). The removal was found to be maximum in the pH range of 6–10. The kinetics of adsorption showed that the phosphate adsorption onto CAC was a gradual process with a quasi-equilibrium being attained in 3 h. The adsorption equilibrium data followed the Temkin isotherm. Thermodynamic parameters such as ΔG ^o , ΔH ^o , and ΔS ^o were evaluated by applying the Arrhenius and van't Hoff equations, and it was found that the adsorption of phosphate on CAC was spontaneous and endothermic.     

Peanut Shell Activated Carbon： Characterization,Surface Modification and Adsorption of Pb^2＋ from Aqueous Solution

Metal ion contamination of drinking water and waste water, especially with heavy metal ion such as lead, is a serious and ongoing problem. In this work, activated carbon prepared from peanut shell （PAC） was used for the removal of Pb^2＋ from aqueous solution. The impacts of the Pb25 adsorption capacities of the acid-modified carbons oxidized with HNO3 were also investigated. The surface functional groups of PAC were confirmed by Fourier transform infrared （FTIR） spectroscopy, X-ray photoelectron spectroscopy （XPS）, Boehm titration. The textural properties （surface area, total pore volume） were evaluated from the nitrogen adsorption isotherm at 77 K. The experimental results presented indicated that the adsorption data fitted better with the Langmuir adsorption model. A comparative study with a commercial granular activated carbon （GAC） showed that PAC was 10.3 times more efficient compared to GAC based on Langmuir maximum adsorption capacity. Further analysis results by the Langmuir equation showed that HNO3 [20% （by mass）] modified PAC has larger adsorption capacity of Pb^2＋ from aqueous solution （as much as 35.5 mg·g^-1）. The adsorption capacity enhancement ascribed to pore widening, increased cation-exchange capacity by oxygen groups, and the promoted hydrophilicity of the carbon surface.