凹凸棒活性炭复合滤料对水中CODMn的吸附研究

以凹凸棒活性炭复合滤料处理原水中的CODMn,探讨了滤料投加量、吸附时间、温度、pH值及原水初始浓度等因素对CODMn去除处理效果的影响。结果表明,滤料的最佳投加量及吸附时间分别为40g／L和80min,吸附反应是放热反应,在pH约为8时CODMn的去除率可达到54．27％,滤料对CODMn的吸附符合Langmuir吸附模型,凹凸棒活性炭复合滤料在微污染饮用水处理领域有一定的实际应用价值。     

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。     

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。     

凹凸棒土-稻壳活性炭滤料对水中腐殖酸的吸附性能研究

进行了凹凸棒土-稻壳活性炭滤料对水中腐殖酸的吸附性能研究,确定了吸附等温线、吸附动力学和吸附热力学等相关吸附模型参数。实验结果表明酸性条件有利于吸附,凹凸棒土-稻壳活性炭滤料对水中腐殖酸的吸附符合Freundlich吸附等温式和准二级动力学模型,吸附是一个自发的吸热过程,升温有利于提高滤料对腐殖酸的吸附能力。     

凹凸棒复合滤料生物过滤去除Ni~(2+)性能研究

采用凹凸棒复合滤料部分替代石英砂滤料,利用凹凸棒复合滤料良好的吸附和生物挂膜性能对普通滤池进行生物强化。探讨了温度,水力负荷,初始浓度对生物过滤去除水中Ni2+的吸附效果的影响。实验结果表明,温度在17.5～20℃时,吸附率可达87.14%以上,最高可达到93.17%;降低滤速可提高滤料对Ni2+去除率,最佳水力负荷为4m/h;Ni2+初始浓度在2～4mg/L时滤料的吸附效果显著。     

竹炭/壳聚糖复合吸附剂的制备与吸附性能研究

以壳聚糖为改性剂,海藻酸钠为交联剂对竹炭进行改性,制备竹炭/壳聚糖复合吸附剂,并研究其对刚果红溶液的最佳吸附条件和吸附性能。实验结果表明:竹炭/壳聚糖复合吸附剂用量为0.2 g,刚果红溶液浓度为100 mg·L~(-1)、pH为4.0、吸附时间为2.0 h、吸附温度为25℃时,复合吸附剂对刚果红溶液的吸附率可达98.11%,影响吸附的主次顺序为吸附温度刚果红溶液浓度吸附时间pH。复合吸附剂在经过5次再生后,对刚果红溶液的吸附率仍然接近90%,说明复合吸附剂的重复使用性能良好。     

改性凹凸棒土的制备及其对SO_2气体的吸附

利用盐酸对凹凸棒土进行改性,改性过程中用正交实验法研究了盐酸改性凹凸棒土的最佳条件,实验证明:盐酸浓度为1 mol/L,盐酸浸泡时间为1 h,热活化温度为250℃时凹凸棒土的改性效果最好。然后将改性好的凹凸棒土制作成复合分子筛,用以吸附SO_2气体,并比较其吸附效果的优劣。实验发现:改性后的凹凸棒土、活性炭、硅烷偶联剂、4A分子筛和氧化铝混合制得的复合分子筛吸附性能最佳。并对凹凸棒土、改性凹凸棒土和复合分子筛的BET、XRD、红外光谱和热重分析进行了测试。结果表明:凹凸棒土的复合分子筛对于吸附SO_2气体具有很好的效果。     

凹凸棒土轻质滤料对水中亚甲基蓝的吸附性能研究

研究了凹凸棒土轻质滤料对阳离子染料亚甲基蓝的静态吸附性能,探讨了粒径大小、pH值、滤料投加量、亚甲基蓝初始浓度和温度对吸附效果的影响。结果表明,降低滤料粒径可以提高吸附能力,碱性环境有利于吸附发生,Langmuir相对于Freundlich具有更好的相关性,理论吸附量可以达到0.912mg·g-1。升温有利于提高滤料的吸附能力,亚甲基蓝在凹凸棒土轻质滤料表面的吸附速率方程符合准二级动力学方程。     

椰壳基活性炭脱除废水中刚果红染料

以颗粒状椰壳基活性炭为吸附剂,对刚果红生物染料进行吸附实验研究。通过实验主要考察了温度、模型溶液酸度、模型溶液初始浓度、活性炭粒度和搅拌速度对活性炭吸附效果的影响。得出在温度为15℃、溶液酸度为pH=2、溶液初始浓度为30mg／L、活性炭粒度小于60目,并且较快的搅拌速度下脱色效果最佳,最佳脱色率可达95．55％。     

Fast removal of ammonium nitrogen from aqueous solution using chitosan-g-poly(acrylic acid)/attapulgite composite

In this work, a novel composite adsorbent with three-dimensional cross-linked polymeric networks based on chitosan (CTS) and attapulgite (APT) was prepared via in situ copolymerization in aqueous solution, and its efficacy for removing ammonium nitrogen (NH₄⁺-N) from synthetic wastewater was investigated using batch adsorption experiments. In the adsorption test, the pH effect, adsorption kinetics, isotherms, and desorbability were examined. A comparison between as-prepared adsorbent and clay, powdered activated carbon (PAC), and other reported adsorbents was also carried out. The results indicate that as-prepared composite adsorbent is pH-dependent and has faster adsorption kinetics and higher adsorption capacity. At natural pH, the composite adsorbent with 20 wt.% APT can adsorb 21.0 mg NH₄⁺-N per gram, far higher than the other adsorbents involved. The adsorbed NH₄⁺-N can be completely desorbed by 0.1 mol/L NaOH within 10 min. All information obtained give an indication that the composite can be used as a novel type, fast-responsive and high-capacity sorbent material for NH₄⁺-N removal.     

Adsorption characteristics of methylene blue onto the N-succinyl-chitosan-<Emphasis Type="Italic">g</Emphasis>-polyacrylamide/attapulgite composite

N-succinyl-chitosan-g-polyacrylamide/attapulgite (NSC-g-PAM/APT) composite was applied as adsorbent for the removal of methylene blue (MB) from aqueous solution. The initial pH value of the dye solutions, the contact temperature, the contact time and the concentration of the dye solutions on adsorption capacity of the composite for MB dye were investigated. The adsorption kinetics and isotherms were also studied. It was shown that all the sorption processes were better fitted by pseudo-second-order equation and the Langmuir equation. The results indicated that the adsorption capacity of the composite was higher than those of chitosan (CTS) and attapulgite (APT). The desorption studies revealed that the composite provided the potential for regeneration and reuse after MB dye adsorption, which implied that the composite could be used as quite effective adsorbent for the removal of MB from aqueous solution.     

活性炭-疏水硅胶复合吸附剂吸附油气

开发出一种上层为活性炭、底层为疏水硅胶的复合吸附剂,并与活性炭、硅胶单独吸附汽油蒸气进行比较,发现不同吸附剂及油气质量浓度对吸附容量及吸附热有大的影响。研究活性炭与硅胶不同体积比对吸附质量比和温度的影响,得出最佳体积比为1∶1。这样高质量浓度油气先被底层的硅胶吸附,低质量浓度的油气再被上层的活性炭吸附,从而综合利用了硅胶的不燃烧及活性炭吸附质量比高的特点,从工艺技术上降低了活性炭吸附放热的安全问题,进而还可适当提高活性炭有效吸附容量。     

喷雾干燥法制备氧化镁材料及其吸附性能

采用喷雾干燥结合热处理法制备花瓣状的MgO,通过对热处理温度的调整,实现MgO表面形貌的调控。研究了所制备MgO粉末作为吸附剂对刚果红的吸附性能,当热处理温度为400℃,得到花瓣状的MgO纳米结构,比表面积达到140.5 m²·g^-1,且对刚果红溶液的饱和吸附量约为1480 mg·g^-1。它们对刚果红的吸附能力比报道的其他花瓣状结构的金属氧化物要高。此外,对其吸附模型、吸附动力学以及吸附机制进行探究,表明吸附过程符合Langmuir吸附模型,所制备样品对刚果红溶液的吸附过程可以由准二级动力学来描述。所制备的花瓣状MgO其高效的吸附性能,使其成为非常有前景的吸附剂用于去除污水中的刚果红染料。     

凹凸棒石基吸附剂的制备及改性

探讨了甘肃产凹凸棒石与活性氧化铝复配所制吸附剂的吸附性能,考察了原料配比、焙烧温度对该吸附剂吸附性能的影响,以及吸附剂改性后的吸附性能。根据试验结果,初步确定了吸附剂的原料配方,其中凹凸棒石占总质量的55％-70％,活性氧化铝占总质量的25％～40％。研究发现,在此配比及焙烧温度为600—700℃时．该吸附剂具有高吸附性;采用浓度为1．0mol／L的硫酸改性1．0h可使吸附剂具有较高的吸附容量。     

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.     

Adsorption Characteristics of Congo Red from Aqueous Solution onto Tea Waste

The feasibility of using tea waste (TW) as a low-cost adsorbent for the adsorption of an anionic dye (Congo red) from aqueous solution has been investigated. Adsorption in a batch process was conducted to study the effect of adsorbent dosage, initial dye concentration, contact time, pH, and temperature. The experimental data were analyzed by the Langmuir, Freundlich, and Temkin models. The adsorption system was best described by the Langmuir isotherm (R ² > 0.99). Adsorption kinetics followed a pseudo-second-order model (R ² > 0.99). The effect of mechanical treatment (vibratory mill) was also studied. The experimental results showed that using this physical treatment leads to an increase in the adsorption capacity of TW from 32.26 to 43.48 mg/g. Thermodynamic analyses revealed that the adsorption of Congo red on TW was endothermic and spontaneous in nature. The results indicated that TW can be employed as a potential low-cost adsorbent for the removal of Congo red from aqueous solution.     

磁性聚苯胺纳米纤维吸附性能的探究

以有机酸、粉煤灰磁珠为掺杂剂,过硫酸铵为氧化剂,采用氧化聚合的方法合成了磁性聚苯胺纳米纤维,对合成的磁性聚苯胺进行扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FT-IR)、紫外-可见光分光光度计(UV)、振动磁强计(VSM)、X-射线衍射仪(XRD)等表征,揭示了其形貌、结构、成分和磁性能,并使用磁性聚苯胺作吸附剂...     

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.