有机质对土壤吸附性能的影响研究

采用了砂土与有机肥按不同比例配制有机质含量不同的4种土样为吸附剂,研究土壤对亚甲基蓝溶液的吸附性能.实验结果表明,4种土样对亚甲基蓝均有较好的吸附性能.20℃时,吸附规律较好的符合langmuir吸附等温式;pH对吸附性能有较大影响,且随有机质含量的增加,影响加强;有机质的存在可提高土壤对亚甲基蓝的吸附能力;土壤对亚甲基蓝的解析量基本随吸附量的增加而增加,但是增加的幅度非常小.     

污泥吸附剂的制备及其对亚甲基蓝的去除研究

以城市污水厂脱水污泥、锯末和焦油的混合物为原料,选择ZnCl2为活化剂制备出过渡孔发达、强度大的优质污泥吸附剂(S-AC),借助BET、FTIR、DT等现代分析测试方法对污泥吸附剂进行表征,并通过吸附动力学、吸附等温线来研究污泥吸附剂的吸附性能;同时,将吸附剂应用于亚甲基蓝溶液的处理,并选择商品活性炭(AC)进行对照试验。结果表明,制得的污泥吸附剂的BET比表面积为358.0 m2/g;在试验浓度范围内,污泥吸附剂在温度分别为20、30和40℃时对亚甲基蓝的最大吸附量分别为57.13、59.37和61.79 mg/g,试验数据均符合Freundlich吸附等温方程;吸附剂的动力学数据均符合液膜扩散方程,液膜扩散为吸附过程的主控步骤。     

磁分离性Ni-ZnFe_2O_4/C纤维复合吸附剂材料的设计合成及性能研究

利用溶剂热法合成了镍锌铁氧体/碳Ni-ZnFe_2O_4/Cfiber(NZFCfiber)复合吸附剂材料,分别利用FTIR、XRD、SEM和VSM分析了样品的组成、结构和磁性能,利用样品对不同浓度亚甲基蓝(methylene blue,MB)水溶液的脱色实验研究了样品的吸附性能。结果表明,所得吸附剂吸附性能优良,同时具有典型的纤维结构,吸附过程符合准二级动力学模型(Quasi Second Order Kinetic Model,QSOKM),且为兰格缪尔单分子层吸附,样品的重复性能良好,且由于无机组分具有强的饱和磁化强度(Ms),因此复合材料具有良好的磁分离性,这也使得吸附剂材料可以方便地回收再利用。     

改性焦粉吸附处理亚甲基蓝印染废水研究

本文以焦粉为原料,采用过二硫酸铵化学法改性焦粉,将其应用于亚甲基蓝印染废水处理,初步得出改性焦粉吸附处理亚甲基蓝废水工艺条件为：振荡时间80min、pH值≥10、改性焦粉用量0．8g、亚甲基蓝废水初始浓度小于20mg／L。拟合实验数据得出改性焦粉对亚甲基蓝的吸附属于Langmuir单分子层吸附;研究了不同温度下的平衡参数（RL）与亚甲基蓝初始浓度（G）的关系,RL都处于0～1之间,表明改性焦粉对亚甲基蓝的吸附性能较好。     

超声波微波协同制备Ti-MCM-41及其对亚甲基蓝吸附性能的研究

以钛酸四丁酯为钛源,在超声微波的协同作用中合成不同Si/Ti的介孔分子筛Ti-MCM-41并采用XRD和IR对样品结构进行表征.以Si/Ti=20的Ti-MCM-41为催化剂,通过对亚甲基蓝的吸附性能考察了吸附时间、吸附溶液浓度、催化剂用量、pH值、温度对脱色率和降解率的影响.结果得出吸附时间为2h,亚甲基蓝浓度为0.10mg·L-1,TiMCM-41的用量为0.04g,pH为7,温度为30℃时介孔分子筛Ti-MCM-41对亚甲基蓝的脱色率和降解率最高,可达59.6%和95%.     

生物玻璃纳米球制备及对亚甲基蓝的吸附研究

制备了一种新型生物玻璃纳米球(BGN),研究了该材料对水中亚甲基蓝的吸附性能。结果表明,在p H值为7~12时,吸附效果均较好。亚甲基蓝去除率在反应前30 min急剧增加,在100 min时达到平衡。吸附反应符合准二级动力学方程和Langmuir等温吸附模型。在30℃时,材料的饱和吸附量为80 mg/g,且吸附量随温度的升高而增大,为吸热反应。材料可有效分离、回收和再生,是一种优良的吸附剂。     

油页岩渣对亚甲基蓝吸附性能的实验研究

进行了油页岩渣对水中亚甲基蓝的吸附实验,探讨了亚甲基蓝(MB)溶液初始质量浓度以及pH值和温度对吸附效果的影响,结果表明,抚顺油页岩渣能有效去除水中的亚甲基蓝,并随着初始浓度的减小、pH值和温度的升高,油页岩渣对MB的吸附率增大。     

镧/钛共掺杂硅基材料的制备及对亚甲基蓝的去除

制备了一种镧/钛共掺杂的硅基材料(SM-La-Ti),探究了其对亚甲基蓝溶液的吸附和光催化能力。结果表明,p H值在7～12时材料的吸附和光催化性能良好,吸附反应在前15min进行迅速,并在90 min达到平衡,符合准二级动力学方程和Fruendich方程。该材料的光催化性能良好,吸附完成后仍能通过光催化进一步去除亚甲基蓝。     

蛭石微细粉的特性及其吸附亚甲基蓝的研究

为了探明天然蛭石对于有机阳离子染料的吸附特性,本文系统表征了气流粉粹得到的蛭石微细粉的物相组成、粒度分布、孔径分布、比表面积、Zeta电位;研究了在不同pH值、固液比、时间、亚甲基蓝浓度条件下蛭石微细粉对亚甲基蓝的吸附量和去除率.结果表明,该蛭石微细粉的主要矿物相为蛭石,含有少量的云母,平均粒径为21.65μm,比表面积为12.63m^2/g,表面呈负电荷.在pH值呈中碱性时蛭石对亚甲基蓝的吸附量最大.在固液比为3g/L、浓度为50mg/L、吸附时间为8h的条件下,蛭石对亚甲基蓝浓度的吸附量为16.42mg/g,去除率达到98.54％.     

改性焦粉的制备及其对亚甲基蓝吸附研究

以焦粉为原料,50％硝酸为改性剂,借助SEM表征其结构,将其应用于亚甲基蓝印染废水处理,考察了改性焦粉对亚甲基蓝吸附平衡时间、吸附速率;测定了不同温度的Langmuir、Freundlich等温方程参数、平衡参数、热力学参数。结果表明：硝酸改性焦粉是硝酸刻蚀焦粉表面增加孔结构、增大表面积的过程;改性焦粉吸附亚甲基蓝平衡时间为200min;在不同温度下吸附与Langmuir、Freundlich等温方程线性相关性较好;热力学参数表明该吸附过程是熵增的自发放热过程。     

Removal of textile basic dye from aqueous solutions using sawdust as bio‐adsorbent

The ability of low cost bio‐adsorbent sawdust to remove basic dye (methylene blue) from aqueous solution is investigated using it in two different forms: in raw form and in chemically treated (with sulphuric acid) form. The effect of contact time, dye concentration, adsorbent dose and the kinetics of adsorption were studied in batch experiments. At neutral pH and 4?gm/l of chemically activated and raw sawdust adsorbents, removal of 98.12% and 97.18% of methylene blue dye (at 100?mg/l concentration) from the aqueous solution, was the best result obtained during study. An average percentage removal difference of less than 5%, between two adsorbents was achieved under different conditions in the experiments. The data fit well in Freundlich isotherm.     

SDS-硅藻土吸附亚甲基蓝和孔雀石绿染料的动力学和热力学

文章主要研究了SDS-硅藻土对亚甲基蓝和孔雀石绿两种染料的吸附动力学和热力学。研究结果表明,SDS-硅藻土对亚甲基蓝和孔雀石绿的平衡吸附量分别为16.3mg/g和20.1mg/g。亚甲基蓝和孔雀石绿在SDS-硅藻土上的吸附行为均可用Langmuir等温方程来描述,20℃时的相关系数分别为0.939 1和0.963 6,升温有利于吸附的进行。准二级吸附速率方程能更好的描述亚甲基蓝和孔雀石绿在SDS-硅藻土上的吸附动力学,20℃时的相关系数分别为0.991 0和0.990 8。通过计算不同温度各热力学参数ΔG、ΔH和ΔS,理论上证实该吸附为一自发的吸热过程,且以物理吸附为主。     

Photodynamic inactivation of E. coli by immobilized or coated dyes on insoluble supports

The photodynamic inactivation of E. coli by methylene blue, rose bengal and eosin covalently immobilized on polystyrene beads and that of methylene blue coated on granular activated carbon, silica gel and XAD-2 (polystyrene resin) was studied. For the study light-exposed and aerated tap-water contaminated with E. coli subjected to dye sensitized photo-oxidation was used. After 0, 10, 20, 30, 40 and 60 min treatment time, samples were diluted and plated on agar to determine the number of Colony Forming Units (CFU). The study gave the following results: all the light exposed and aerated immobilized dyes (methylene blue, rose bengal and eosin) had an elevated photodynamic action on E. coli. After only 30 min treatment time there was 97.5% inactivation of E. coli by methylene blue, 92.2% by rose bengal and 81.6% by eosin. Methylene blue proved to be the most active. Methylene blue coated on activated carbon, silica gel and XAD-2 also had a high photodynamic action. Activated carbon was found to be the best support; since after 30 min contact it had adsorbed 2 mg g⁻¹ of dye and inactivated 94.4% of E. coli. Comparing the differences in the regression lines of the various methods employed (parallel test) it was found that the effect of each dye was significantly high (P = 0.001) whereas there was no significant difference between methylene blue immobilized and coated on active carbon. From these results it seems that sensitized photo-oxidation using methylene blue coated on activated carbon can be used as an alternative for disinfecting waters for potable purposes, but its effectiveness against other micro-organism present in the water must also be tested.     

亚甲蓝光化学法对血浆中水疱口膜炎病毒灭活效果的研究

目的评价亚甲蓝光化学法（MBP）对血浆中水疱口膜炎病毒（VSV）的灭活效果。方法将7.12 logTCID50.mL-1VSV加入血浆中,采用不同的参数组合[亚甲蓝（MB）浓度（0.8、1.3μmol.L-1）、光照强度（20 000、50 000 LUX）、光照时间（10、20、30 min）]灭活处理后,分别将样品加入非洲绿猴肾细胞（Vero）单层细胞中培养,观察细胞病变（CPE）状况,评价病毒灭活的效果。结果经过30 min灭活处理,可将病毒彻底灭活,病毒滴度下降6 log值以上。实验设置的MB浓度和光照强度对血浆病毒灭活的影响不明显。结论在MB浓度为0.8μmol.L-1和光照强度20 000 LUX的条件下,处理血浆30 min以上就能有效灭活血浆中的VSV病毒。     

Determination of alkyl benzenesulfonate in water by u.v. method

Alkyl benzenesulfonates in water were determined by u.v. method.Alkyl benzenesulfonates in water were extracted by 1,2-dichloroethane as methylene blue complexes, and, after being isolated from methylene blue by washing with cone. hydrochloric acid, were extracted by water from 1,2-dichloroethane solution.Alkyl benzenesulfonate solutions were measured by absorbance at 222 nm. This band is characteristic of benzene and alkyl benzenesulfonates separated from other anionic surfactants completely.     

Removal of organic dyes by magnetic alginate beads

This study deals with the development of a clean and safe process for water pollution remediation. We have synthesized a magnetic adsorbent in order to develop a solid-phase extraction process assisted by a magnetic field. To follow an 'ecoconception' approach, magnetic beads containing magnetic nanoparticles and activated carbon are prepared with a biopolymer extracted from algae, sodium alginate. The use of renewable bioresources of low cost and those disposable in large amount allows the development of a product with a low impact on the environment. The adsorption properties of activated carbon and magnetic properties of iron oxide nanoparticles are combined to produce an interesting magnetic composite. Synthesis and characterization of the magnetic beads have been reported. Their adsorption capacity was investigated by measuring the removal of two dyes (methylene blue and methyl orange) of different charges from aqueous solutions. The efficiency of the beads has been compared with that of non-encapsulated activated carbon. The effects of initial dye concentration, pH and calcium content of the beads have been studied. Adsorption kinetics experiments have been carried out and the data have been well fitted by a pseudo-second-order equation.