NaOH改性花生壳对亚甲基蓝染料吸附性能的研究

花生壳用5%的NaOH溶液改性作吸附剂处理亚甲基蓝染料废水,考察pH值、吸附剂投加量、染料浓度和温度及吸附时间对染料吸附性能的影响。结果表明,吸附最佳的工艺条件为:温度25℃,吸附剂投加量0.3 g,亚甲基蓝的初始浓度3.5 g/mL,反应时间135 min,pH值7。此时改性花生壳对亚甲基蓝的吸附率达99.57%。     

高岭土尾矿对亚甲基蓝的吸附行为的研究

文章探索了高岭土尾矿对亚甲基蓝溶液的吸附性行为,测定了高岭土尾矿的粒度与用量、亚甲基蓝溶液的pH与浓度、吸附时间及吸附温度等因素对亚甲基蓝吸附性能的影响。结果表明：在碱性条件下,高岭土尾矿对亚甲基蓝溶液有较好的吸附能力,亚甲基蓝浓度增加,高岭土尾矿对其脱色率减小,而随着高岭土尾矿用量的增加,则脱色率不断提高。高岭土尾矿对亚甲基蓝的等温吸附服从Freundlich方程式。高岭土尾矿对亚甲基蓝吸附的随时间的增加、温度的升高而增加。通过对这些参数的探索和测定,高岭土尾矿的吸附能力可以达到98%以上,高岭土尾矿能有效除去溶液中的亚甲基蓝。     

超声降解铬黑T及亚甲蓝的实验研究

尝试采用超声波技术对铬黑T及亚甲基蓝两种模拟染料废水进行降解实验。以脱色率为指标,分别考察pH值、超声功率强度、超声时间和温度等因素对两种模拟染料废水脱色作用的影响。结果表明:超声波技术对铬黑T及亚甲基蓝两种模拟染料废水具有一定的脱色能力,随着pH值的增大,脱色能力减弱。常温下,在pH=1.79附近、超声时间120min,超声功率0.7kw时,亚甲基蓝模拟染料废水的脱色率为27.60%,铬黑T模拟染料废水的脱色率为20.33%。进一步地采用超声波与水合二氧化锰联用技术,可以极大提高有机染料的降解效率,水合二氧化锰投加量为40mg/L时,亚甲基蓝模拟染料废水的脱色率达到92.48%。     

糠醛渣对废水中铜离子的吸附研究

以生产糠醛的废弃物糠醛渣为吸附剂,研究了糠醛渣对Cu2+的吸附性能。考察了糠醛渣的用量、吸附时间、吸附温度以及吸附剂的重复使用次数对去除率的影响。实验得到糠醛渣去除废水中Cu2+(10 g/L)的最佳条件为:吸附剂用量为1.0 g,吸附时间为90 min,吸附温度为50℃,去除率可达64.6%,吸附剂重复使用5次后的去除率仍达44.1%。糠醛渣可作为优良的吸附剂处理废水中的Cu2+。该方法实现了以废治废的废物资源化目标,具有良好的社会效益和经济效益。     

蛋壳膜吸附脱色处理水溶性染料

以蛋壳膜作吸附剂,对曙红等4种不同结构的水溶性染料分子的单水溶液进行吸附脱色研究。探讨了蛋壳膜用量、溶液pH值、吸附时间及温度对吸附脱色的影响。结果表明：蛋壳膜对水溶性染料的吸附宜在酸性条件下进行,在最佳条件下,蛋壳膜对曙红、铬黑T的脱色率达95%以上,对亚甲基蓝和甲基紫吸附效果不理想,说明蛋壳膜本身对含甲基类染料吸附能力较低。此研究利用了废弃的蛋壳膜,解决染色废液的处理问题,对于蛋壳膜的开发利用以及染料废水的脱色处理寻找到了新的途径。     

杜仲果壳残渣对亚甲基蓝吸附性能研究

以杜仲果壳残渣为原料,研究了其对亚甲基蓝溶液的吸附作用。考察了粒度、吸附剂投入量、亚甲基蓝初始浓度、p H、温度对吸附性能的影响。结果表明:杜仲渣对亚甲基蓝有较好的吸附效果,吸附的最佳粒径为120目,最佳投入量为7.5 g/L,最佳p H=9,最适温度为20℃。在最佳吸附条件下,杜仲渣对亚甲基蓝的吸附率高达98%。     

生物质吸附剂——改性玉米芯对印染废水脱色性能研究

研究了生物质吸附剂--改性玉米芯对印染废水的脱色特性.考察了吸附时间、pH值、初始浓度、吸附剂用量、温度、染料结构等对印染废水脱色效果的影响,发现主要影响因素为吸附时间、pH值和初始浓度.改性玉米芯时50 mL印染废水脱色的最佳处理条件为:pH值2、对酸性大红和直接深蓝的吸附时间分别为60 min和30 min、初始浓度50 mg·L-1、吸附剂用量1.0 g.在此条件下,脱色率可迭95%以上,实现了以废治废、变废为宝的目的.     

氯化锌活化木糖渣制活性炭及应用研究

文章以两步法生产糠醛中间废弃物木糖渣为原料,用氯化锌进行活化制备活性炭,并将所制备活性炭用于糠醛废水处理。考察了活性炭制备条件对其吸附性能的影响,探索最佳活性炭制备工艺;研究了所制备的活性炭产品对糠醛废水的脱色性能。结果表明,在最佳制备条件下制得活性炭碘吸附值及亚甲基蓝吸附值分别为818.9 mg/g和178.5 mg/g;所制活性炭用于糠醛废水的脱色处理,脱色率可达到97.8%。     

二硫化钼磁性纳米复合材料的制备及其对水体中偶氮染料的吸附性能研究

利用二硫化钼表面及内部高度发达的孔隙结构,以钼酸钠为钼源,L-半胱氨酸为硫源,同时加入氧化石墨烯和磁性四氧化三铁,通过一步水热法制备出二硫化钼磁性纳米复合材料。并研究了二硫化钼磁性纳米复合材料对水体中偶氮染料的吸附效果。实验表明:吸附温度为25℃时,当二硫化钼磁性纳米复合材料的投放量为300mg/L,其对亚甲基蓝的吸附时间为30min,染料废水溶液PH值为8.0时,二硫化钼磁性纳米复合材料对亚甲基蓝的吸附率可达94.6%;对刚果红的吸附时间为70min,染料废水溶液PH值为6.0时,二硫化钼磁性纳米复合材料对刚果红的吸附率可达61.6%。当二硫化钼磁性纳米复合材料的投放量为400mg/L,其对甲基橙的吸附时间为70min,染料废水溶液PH值为7.0时,二硫化钼磁性纳米复合材料对甲基橙的吸附率可达23.4%。     

硅藻土对亚甲基蓝的吸附性能研究进展

亚甲基蓝是染料业和印染业常用的一种阳离子染料,每年产生大量含亚甲基蓝的废水。硅藻土是一种比表面积大,稳定性好且全球储量丰富的天然非金属矿物。硅藻土可通过物理吸附对废水中的亚甲基蓝进行脱色,本文总结了硅藻土吸附亚甲基蓝的实验研究进展。得出分子筛、SO~(2-)_4/SnO_2-Fe_2O_3、粘土和坡缕石硅藻土复合物对亚甲基蓝的去除率均达到99%以上。硅藻土复合物作为吸附剂,操作简便,耗能低,吸附效果好,是实际生产中较为理想的亚甲基蓝吸附剂。     

Adsorption of congo red by three Australian kaolins

This study investigated the potential use of kaolin as alternative adsorbents for removal of congo red from wastewater. The effect of adsorbent dosage, dye concentration, pH and temperature were experimentally studied to evaluate the adsorption capacity, kinetics and equilibrium. Experimental results revealed that optimal adsorption took place at acidic pH and high dye concentration. Ceram kaolin had the highest removal efficiency among studied kaolins, followed by K15GR and Q38. The dye uptake process obeyed the pseudo-second order kinetic expression and was best described by the Langmuir isotherm. Intra-particle diffusion studies showed that the adsorption mechanism was not exclusively controlled by the diffusion step and was more likely to be governed by external mass transfer. Thermodynamic studies showed congo red adsorption on all kaolins was exothermic and spontaneous in nature. Recovered Q38 and K15GR kaolin demonstrated an enhanced adsorption capability. The results indicate that these local kaolins could be employed as low-cost alternatives for removal of anionic dyes from industrial wastewater.     

柠檬酸改性糠醛渣的制备

研究了柠檬酸改性糠醛渣的制备过程和条件。首先对糠醛渣进行预处理,然后分别用20%的异丙醇和20%的氢氧化钠溶液处理,最后用柠檬酸对其进行改性,得到柠檬酸改性糠醛渣。讨论了反应时间,反应温度,柠檬酸溶液浓度,固液比等因素对改性的影响。结果表明:当反应时间60 min,反应温度80℃,柠檬酸质量浓度100 g/L,固液比1︰3时获得的改性糠醛渣吸附亚甲基蓝效果最好,去除率可达到98.2%。     

Adsorption of congo red on mesoporous activated carbon prepared by CO2 physical activation

This research demonstrates the production of mesoporous activated carbon from sargassum fusiforme via physical activation with carbon dioxide. Central composite design was applied to conduct the experiments at different levels by altering three operating parameters. Activation temperature(766–934 ℃), CO_2 flow rate(0.8–2.8 L·min(~-1)) and activation time(5–55 min) were the variables examined in this study. The effect of parameters on the specific surface area, total pore volume and burn-out rate of activated carbon was studied,and the influential parameters of methylene blue adsorption value were identified employing analysis of variance. The optimum conditions for maximum methylene blue adsorption value were: activation temperature = 900 ℃, activation time = 29.05 min and CO_2 flow rate = 1.8 L·min(~-1). The activated carbon produced under optimum conditions was characterized by BET, FTIR and SEM. The adsorption behavior on congo red was studied. The effect of parameters on the adsorbent dosage, temperature, PH and initial congo red concentration was investigated. The adsorption properties of the activated carbon were investigated by kinetics. The equilibrium removal rate and maximum adsorption capacity reaches up to 94.72%, 234 mg·g-1,respectively when initial congo red concentration is 200 mg·L~(-1) under adsorbent dosage(0.8 g · L~(-1)),temperature(30℃), PH7.     

MIL-53(Fe)金属有机骨架材料对刚果红的高效吸附

通过水热法制备规则外形的MIL-53(Fe)金属有机骨架材料(MOF),并通过傅里叶红外光谱(FT-IR)、X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)对材料进行表征。以刚果红作为目标物,研究所制得的MOF材料对其的吸附行为。结果表明,MIL-53(Fe)对刚果红的吸附动力学符合准二级动力学,吸附模型符合Langmuir吸附模型。MIL-53(Fe)材料对刚果红的最大吸附量为1 482 mg/g,是可望用于去除染料废水刚果红的高效吸附材料。     

The use of chromium waste sludge for the adsorption of colour from dye effluent streams

Adsorption studies show that chromium hydroxide precipitates can be used for the removal of methylene blue, reactive blue, congo red and disperse orange dyes from aqueous media. Three different mechanisms are involved: attraction of positive surface charges on the precipitate at low pH for dye anions (reactive blue and congo red); attraction of negative surface charges on hydroxide at high pH for dye cations (methylene blue), and dye particle entrapment for the neutral disperse orange. The point of zero charge of the chromium hydroxide precipitate based on the dye adsorption studies is pH 10.5. The changes in the surface charge of such precipitates with pH can be used to achieve the removal of any charged dye species. © 2002 Society of Chemical Industry     

新生MnO2对茜素红吸附脱色的研究

以新生MnO2为吸附剂,对水中茜素红染料进行了脱色研究,探讨了影响吸附的因素。结果表明,降低pH值、增加吸附剂投加量,有利于新生水合二氧化锰对茜素红染料的脱色。当新生态水合MnO2浓度为300 mg/L,茜素红浓度为400 mg/L,pH=2,反应时间为60 min时,茜素红脱色率达90%以上。实验还发现对茜素红染料吸附较好符合Freundich吸附等温式,吸附速率较快。     

Adsorption of Congo Red by Poly(Dimethyl Diallyl Ammonium Chloride)/Polyacrylamide Hydrogels with Excellent Acid and Alkali Resistance

Cationic hydrogels, poly(dimethyl diallyl ammonium chloride)/polyacrylamide (PDMDAAC/PAM), were prepared for the removal of congo red (CR) from aqueous solution. Process parameters affecting the adsorption efficiency were systematically investigated. The results showed that the calculated monolayer adsorption capacity of the cationic hydrogels was found to be 200 to 465 mg/g. The hydrogels showed appreciable adsorption capacities within pH range investigated. The adsorption process well obeyed pseudo-second-order kinetics and the Langmuir isotherm. The ion exchange dominated the whole adsorption mechanism. All the information suggests that the as-prepared cationic hydrogels show potential applications in the fields of wastewater treatment for the removal of anionic dyes such as CR.     

Application of Modified Water Nut Carbon as a Sorbent in Congo Red and Malachite Green Dye Contaminated Wastewater Remediation

Batch and column adsorption experiments were conducted to investigate the removal of dyes from wastewater by water nut modified carbon (WNMC). Acidic pH was favorable for adsorption for Congo red dyes and basic pH was favorable for the adsorption for Malachite green dyes. The surface property of the sorbent was characterized by scanning electron microscopy and Fourier transform infrared techniques. The adsorption process was found to be endothermic and spontaneous. Different models of adsorption were used to describe the kinetics data and to calculate the corresponding rate constants of WNMC surfaces for dyes adsorption. A mechanism of dyes adsorption associating chemisorption processes is presented allowing the discussion of the variations in adsorption behavior of the material. These data suggested that WNMC are promising materials for dyes sorption. The data were in good agreement with bed depth service time model.     

Biosorption of hazardous textile dyes from aqueous solutions by hen feathers: Batch and column studies

The biosorption potential of hen feathers (HFs) to remove hazardous textile dyes, namely congo red (CR) and crystal violet (CV), from their aqueous solutions was investigated in batch and dynamic flow modes of operation. The effect of biosorption process parameters such as solution pH, initial dye concentration, temperature, feed flow rate and bed height was studied. Biosorption equilibrium data were well described by the Langmuir isotherm model. Kinetic studies at different temperatures showed that the rate of biosorption followed the pseudo second-order kinetics well. A thermodynamic study showed that biosorption of both CR and CV was spontaneous and endothermic. Breakthrough time increased with increase in bed height but decreased with increase in flow rate. The Thomas model showed good agreement with the dynamic flow experimental data. Overall, the results suggest the applicability of HFs as an efficient biosorbent for removal of carcinogenic textile dyes from aqueous media.     

Magnetic Zinc Ferrite–Alginic Biopolymer Composite: As an Alternative Adsorbent for the Removal of Dyes in Single and Ternary Dye System

Recently, magnetic bio-composites as adsorbent are widely being explored in waste water treatment because of their exceptional properties like high adsorption capacity, selectivity and cost-effective nature. In the present study, a novel recyclable magnetic composite containing magnetic zinc ferrite and alginate in alginic form (ZnFN–Alg) was developed. Various techniques like Fourier Transform-Infra Red, X-ray diffraction, transmission electron microscope with energy dispersive spectra, Brunauer–Emmett–Teller, thermo gravimetric-differential thermal analysis and Point Zero Charge (pH_zpc) were used to characterize the surface morphology of magnetic composite. The magnetic composite was used as adsorbent to remove congo red, crystal violet and brilliant green dyes in single and ternary systems. The kinetic studies data was best fitted to Lagergren pseudo second order whereas mechanism of adsorption was described by intra particle diffusion model in single as well as ternary systems. The adsorption equilibrium data was best fitted to Langmuir isotherm among various adsorption isotherm models. Thermodynamic studies confirmed that the adsorption process was spontaneous in nature. The regeneration ability of ZnFN–Alg composite was studied individually in single and ternary dye systems for seven cycles and showed significant results. It was concluded that magnetic ZnFN–Alg can serve as suitable alternative for the removal of dyes in single and ternary systems.