Adsorption Characteristics of Activated Carbon Derived from Scrap Tires for Malachite Green:Influence of Small Organics

The influence of small organics on the adsorption characteristics of activated carbon produced from industrial pyrolytic tire char(APTC)for malachite green(MG) was investigated by a batch method. Phenol was chosen as the representative of small organics. The effects of phenol on adsorption equilibrium, kinetics and thermodynamics were studied systematically. The results indicate that APTC is a potential adsorbent for MG. The presence of phenol decreases the adsorption capacity of APTC for MG, but improves the rate of adsorption, while the adsorption characteristics, such as equilibrium, kinetics and thermodynamics are not affected by phenol. The adsorption equilibrium data follow Langmuir isotherm and the kinetic data are well described by the pseudo-second-order kinetic model. The adsorption process follows intra-particle diffusion model and the adsorption rate is determined by more than one process. Thermodynamic study shows that the adsorption is an endothermic and spontaneous physisorption process.

Application of activated carbon derived from scrap tires for adsorption of Rhodamine B

Activated carbon derived from solid hazardous waste scrap tires was evaluated as a potential adsorbent for cationic dye removal. The adsorption process with respect to operating parameters was investigated to evaluate the adsorption characteristics of the activated pyrolytic tire char （APTC） for Rhodamine B （RhB）. Systematic research including equilibrium, kinetics and thermodynamic studies was performed. The results showed that APTC was a potential adsorbent for RhB with a higher adsorption capacity than most adsorbents. Solution pH and temperature exert significant influence while ionic strength showed little effect on the adsorption process. The adsorption equilibrium data obey Langmuir isotherm and the kinetic data were well described by the pseudo second-order kinetic model. The adsorption process followed intra-particle diffusion model with more than one process affecting the adsorption process. Thermodynamic study confirmed that the adsorption was a physisorption process with spontaneous, endothermic and random characteristics.

Improvement in electrochemical capacitance of activated carbon from scrap tires by nitric acid treatment

Activated carbon （AC） obtained from the industrial pyrolytic tire char is treated by concentrated nitric acid （AC-HNO3） and then used as the electrode material for supercapacitors. Surface properties and electrochemical capacitances of AC and AC- HNO3 are studied. It is found that the morphology and the porous texture for AC and AC- HNO3 have little difference, while the oxygen content increases and functional groups change after the acid treatment. Electrochemical results demonstrate that the AC-HNO3 electrode displays higher specific capacitance, better stability and cycling performance, and lower equivalent series resistance, indicating that AC obtained from the industrial pyrolytic tire char treated by concentrated nitric acid is applicable for supercapacitors.

废轮胎活性炭对水中低浓度苯酚的吸附动力学特性

为了去除水中残留的低浓度苯酚,采用水蒸气活化法制备废轮胎活性炭,分析了废轮胎活性炭自水溶液吸附低浓度苯酚的吸附动力学特性,考察了吸附剂投加量和苯酚初始浓度对吸附过程的影响。分别采用拟一级反应、拟二级反应和颗粒内扩散反应模型对不同温度下的反应动力学数据进行拟合。研究结果表明:拟二级反应动力学模型能够较好地描述废轮胎活性炭吸附低浓度苯酚的动力学数据,颗粒内扩散影响吸附速率,但不是唯一的速率控制步骤,计算得到的表观吸附活化能表明,该吸附过程以物理吸附为主,废轮胎活性炭用量为0.3g/L时,苯酚浓度小于2μg/L。

废轮胎热解炭的分析及其活化特性的研究

用常规分析方法分析了废轮胎热解炭的成分和性质,用X射线能谱分析法、压汞法、N2吸附法等测定了热解炭的孔隙结构特性,并用CO2、含2%氧气的氮气流和水蒸气等活化气体对热解炭进行活化方面的研究。结果表明,热解炭灰分和硫含量比较高;两种不同粒径热解炭的比孔容积均在r≈25nm处有最大值;在相同活化时间和活化剂流速下,温度越高,活化炭烧失率越大,比表面积也越大;在一定温度和活化剂流速下,烧失率和比表面积随着活化时间的增加而增大;对所有试验工况,烧失率越大,活化炭比表面积也越大。总体上水蒸气活化炭与CO2的活化效果较好,而含2%O2的氮气流活化的效果则次之。活化炭与商业活性炭的比较显示,前者具有较发达的孔隙结构,在进行大分子物质吸附时,具有替代商业活性炭的潜力。

废轮胎热解炭吸附性能研究

研究了粒径为40-400μm废轮胎颗粒在450-800℃条件下,以15-40℃/min升温速率经0.5-2 h进行热解获得的热解炭对亚甲基蓝、腐殖酸、苯酚和Cu2＋的吸附能力,考察了不同热解条件对其吸附能力的影响,探讨了吸附剂用量、初始浓度、p H、温度、时间对吸附能力的影响。研究结果表明,热解条件对吸附能力的影响排序为温度〉时间〉粒径〉升温速率。400μm胶粉以40℃/min升温速率,在800℃条件下热解1.5 h,所获得的热解炭不经活化,其比表面积SBET可达114 m^2/g,能有效吸附Cu^2＋、亚甲基蓝和腐殖酸,但对苯酚的吸附能力较弱,对Cu^2＋、亚甲基蓝和腐殖酸的适宜吸附条件分别为热解炭投加量分别为1、2、1.5 g/L,平衡吸附时间分别为2、1、3 h,吸附质初始浓度分别为120、100、6 mg/L,p H分别为4.5-6、1.0、8.0。未经活化的废轮胎热解炭可作为商业活性炭的廉价替代品,其适宜的吸附质为重金属及较大分子类型的有机物。

废轮胎活性炭对孔雀石绿的吸附性能研究(英文)

以工业规模的废轮胎热解炭黑为原料,经过水蒸汽活化制备废轮胎活性炭,采用间歇实验法考察了废轮胎活性炭对三苯甲烷类染料孔雀石绿的吸附性能.系统考察了操作因素如接触时间、溶液pH、吸附剂用量、孔雀石绿初始浓度、离子强度、重金属离子以及温度等对吸附过程以及吸附性能的影响.结果表明,废轮胎活性炭是孔雀石绿的有效吸附剂,其吸附容量高于文献报道的相关吸附剂.吸附过程在240 min内达到平衡,与相关吸附剂的平衡时间一致;孔雀石绿初始浓度高、较高的初始溶液pH值以及升高吸附温度有利于废轮胎活性炭对孔雀石绿的吸附;而较高的溶液离子强度以及重金属离子的存在不利于孔雀石绿的吸附.

废轮胎活性炭吸附低浓度苯酚热力学的研究

以工业规模热解装置得到的热解炭黑为原料,采用物理活化法制备得到废轮胎活性炭(APTC),研究了APTC对水溶液中低浓度苯酚的吸附热力学性质,并考察了溶液初始pH值对吸附过程的影响.采用常用的吸附等温线方程对不同吸附温度下的平衡数据进行拟合,并对吸附常数和热力学函数进行了估算.研究结果表明:Freundlich和Langmuir方程均能较好地描述APTC对苯酚的吸附;相关热力学参数表明该吸附过程是自发的放热反应,属于物理吸附.

废轮胎活性炭对甲基橙的吸附研究(英文)

以工业规模的废轮胎热解炭黑为原料,经过水蒸汽活化制备废轮胎活性炭,采用间歇实验法考察了废轮胎活性炭对阴离子染料甲基橙的吸附性能.系统研究了吸附过程的平衡、动力学及热力学性质.考察了操作因素,如接触时间、溶液pH、吸附剂用量、甲基橙初始浓度以及温度等对吸附过程的影响.研究结果表明,废轮胎活性炭是甲基橙的有效吸附剂,其吸附容量高于商用活性炭以及文献报道的相关吸附剂.吸附平衡符合Langmuir等温线,吸附动力学过程与假二级动力学模型相符;热力学研究表明,该吸附过程为吸热、自发进行的物理吸附.