| 346 | 10 | 202 |
| 下载次数 | 被引频次 | 阅读次数 |
采用浸渍法制备铈改性活性炭(Ce/AC),研究活性炭改性前后对苯酚的去除率,考察pH值及Ce/AC投加量对苯酚去除率的影响,采用吸附等温线模型、热力学模型及动力学模型对Ce/AC吸附苯酚过程进行拟合,研究其吸附特性及机理。结果表明,同等条件下,Ce/AC对苯酚的吸附量为56.9mg/g,是改性前的4倍;在25℃,不调节pH值,Ce/AC的投加量为6g/L时,Ce/AC对苯酚去除率达到95.4%;Langmuir吸附等温线可较好地描述Ce/AC吸附苯酚过程,热力学计算结果表明,Ce/AC吸附苯酚过程为自发吸热熵值增大的过程,吸附动力学符合拟二级动力学模型,Ce/AC吸附苯酚过程存在亲(疏)水作用、氢键作用及软硬酸碱作用。
Abstract：Cerium modified activated carbon was prepared by impregnation method, phenol removal rate of activated carbon before and after modification and the effects of pH and dosage of Ce/AC on phenol removal rate were studied. Its adsorption properties and adsorption mechanism were studied by using adsorption isotherm, adsorption thermodynamic model and adsorption kinetics model. The results showed that the phenol adsorption capacity of Ce/AC was 56.9mg/g, 4 times that of activated carbon at same experimental conditions. Phenol removal rate was 95.4% when the Ce/AC dosage was 6g/L without adjusting the pH of phenol solution at 25℃. Langmuir adsorption isotherm model could fitted better with phenol adsorption process on Ce/AC, Thermodynamic calculation indicated that the adsorption of phenol on Ce/AC was an spontaneous, endothermic and entropy-increasing process. The adsorption behavior of phenol on Ce/AC followed Pseudo-second-order kinetic model. Hydrophilic(hydrophobic) interaction, hydrogen bond action and hard and soft acid-base theory could explain the adsorption behavior of phenol on Ce/AC.
[1]Xiaoshuang Ma,Najun Li,Jun Jiang,et al.Adsorption-synergic biodegradation of high concentrated phenolic water by Pseudomonas putida immobilized on activated carbon fiber.Journal of Environmental Chemical Engineering[J].2013,1(3):466-472.
[2]孙婷,高晓明,牛凤兴,等.金属复合氧化物Bi VO4的制备及其光催化降解含酚废水的研究.材料导报[J].2013,27(5):66-69.
[3]Fierro V,Torne′-Ferna′ndez V,Montane′D,et al.Adsorption of phenol onto activated carbons having different textural and surface properties.Microporous and Mesoporous Materials[J].2008,111(1/2/3):276-284.
[4]黎国兰,李松,李桂英,等.活性炭表面含氧基团对苯酚吸附平衡及动力学的影响.化学研究与应用[J].2009,21(10):1427-1434.
[5]杨英,孟红旗,李素敏.金属盐改性活性炭吸附去除水中苯酚实验研究.河南理工大学学报(自然科学版)[J].2012,31(5):617-621.
[6]汪滨,张广心,郑水林,等.Ce掺杂纳米Ti O2/硅藻土复合材料的光催化性能.硅酸盐学报[J].2016,44(8):1192-1199.
[7]WANG B,ZHANG G X,SUN Z M,et al.Synthesis of natural porous minerals supported Ti O2 nanoparticles and their photocatalytic performance towards rodamine B dcomposition.Powder Technology[J].2014,262(8):1-8.
[8]田志茗,高艳丽,孙美玉.纳米Ce O2的制备及其吸附苯酚性能的研究.石油化工[J].2011,40(11):1242-1246.
[9]王广建,张健康,杨志坚,等.活性炭负载银吸附剂的制备与脱除苯并噻吩的研究.功能材料[J].2013,44(7):949-953.
[10]丁春生,倪芳明,缪佳,等.氨水改性活性炭的制备及其对苯酚吸附性能的研究.武汉理工大学学报(交通科学与工程版)[J].2011,35(6):1237-1241.
[11]Zhengfang Wang,Mo Shi,Jihua Li,et al.Influence of moderate pre-oxidation treatment on the physical,chemical and phosphate adsorption properties of iron-containing activated carbon.Journal of Environmental Sciences[J].2014,26(3):519-528.
[12]Shuheng Yao,Jiajun Zhang,Dekui Shen,et al.Removal of Pb(II)from water by the activated carbon modified by nitric acid under microwave heating.Journal of Colloid and Interface Science[J].2016,463(2):118-127.
[13]邹勇,曹晖,刘少友,等.Li+掺杂Ti O2介孔材料对靛染废液吸附处理的研究.离子交换与吸附[J].2016,32(3):262-271.
[14]狄志清,张钱丽,魏杰.介孔碳吸附亚甲基蓝的热力学和动力学研究.水处理技术[J].2015,41(3):54-57.
[15]高雯雯,苏婷,弓莹,等.载铜活性炭对焦化废水的吸附性能研究.非金属矿[J].2016,39(1):40-43.
[16]王哲,黄国和,安春江,等.对硝基苯酚在高炉水淬渣上的吸附机制及表面分形研究.环境科学[J].2016,37(6):2211-2219.
[17]尤翔宇,杨杰,王云燕,等.苯酚在活性炭上的吸附模型.中国有色金属学报[J].2012,22(10):2925-2929.
[18]冯云晓,王莉,腊明,等.K2CO3-HNO3法制备活性炭及其对苯酚吸附动力学研究.郑州大学学报(理学版)[J].2015,47(2):95-100.
[19]孙良玉,方芳,林俊雄,等.改性头发角蛋白对亚甲基蓝的吸附研究.环境科学与技术[J].2016,39(5):60-64.
基本信息:
DOI：10.16026/j.cnki.iea.2017030260
中图分类号:O647.3;TQ424.1;X703
引用信息:
[1]高雯雯,张智芳,孙琪,等.铈改性活性炭对苯酚的吸附行为研究[J].离子交换与吸附,2017,33(03):260-270.DOI:10.16026/j.cnki.iea.2017030260.
基金信息:
陕西省科技厅项目(2015GY114);; 陕西省教育厅产业化培育项目(15JF035)
2017-06-20
2017-06-20