煤基活性焦的制备及其对含酚废水的吸附性能研究
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摘要
用延安子长煤在550℃热解后的半焦为原料,采用化学活化法制得活性焦,并对其进行了N2等温吸附、扫描电子显微镜(SEM)、X射线衍射(XRD)等表征。以苯酚和对硝基苯酚为目标吸附物,以吸附剂添加量、溶液浓度、吸附时间等为考察因素,研究了该活性焦对苯酚和对硝基苯酚模拟含酚废水的吸附性能,探索了该活性焦对苯酚、对硝基苯酚的吸附动力学行为。结果表明,该活性半焦对上述2种酚均具有良好的吸附性能,准二级动力学模型拟合的相关系数均在0.999以上,模型饱和吸附量与实验值相近,能很好地描述了2种酚类在该活性焦上的吸附行为。
Activated semicoke was prepared with pyrolysis solid product of coal in Zichang by chemical activation. The structure of activated semicoke was characterized by nitrogen adsorption isotherms, scanning electron microscope(SEM), and X-ray diffraction(XRD). The adsorption properties of activated semicoke were detected by removal of phenol and p-nitrophenol from aqueous solution under room temperature. The adsorption kinetic of phenol and p-nitrophenol adsorbed on activated semicoke was studied. The influencing factors, such as dosage of adsorbent, initial concentration, and contact time, on adsorption performance of activated semicoke were investigated. The results indicated that activated semicoke could remove phenol and p-nitrophenol effectively. The adsorption process followed the pseudo-second-order kinetic model with the correlation coefficents exceeding 0.999, and the saturated adsorption capacity calculated was close to the experimental value.
Activated semicoke was prepared with pyrolysis solid product of coal in Zichang by chemical activation. The structure of activated semicoke was characterized by nitrogen adsorption isotherms, scanning electron microscope(SEM), and X-ray diffraction(XRD). The adsorption properties of activated semicoke were detected by removal of phenol and p-nitrophenol from aqueous solution under room temperature. The adsorption kinetic of phenol and p-nitrophenol adsorbed on activated semicoke was studied. The influencing factors, such as dosage of adsorbent, initial concentration, and contact time, on adsorption performance of activated semicoke were investigated. The results indicated that activated semicoke could remove phenol and p-nitrophenol effectively. The adsorption process followed the pseudo-second-order kinetic model with the correlation coefficents exceeding 0.999, and the saturated adsorption capacity calculated was close to the experimental value.
引文
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[3]Lam S M,Sin J C,Satoshi I,Abdullah A Z,Mohamed A R.Enhanced sunlight photocatalytic performance over Nb2O5/Zn O nanorod composites and the mechanism study.Applied Catalysis A:General[J].2014,471:126-135.
[4]Sin J C,Lam S M,Lee K T,Mohamed A R.Photocatalytic performance of novel samarium-doped spherical-like Zn O hierarchical nanostructures under visible light irradiation for 2,4-dichlorophenol degradation.Journal of Colloid and Interface Science[J].2013,401:40-49.
[5]Ray S,Lalman J A,Biswas N.Using the Box-Benkhen technique to statistically model phenol photocatalytic degradation by titanium dioxide nanoparticles.Chemical Engineering Journal[J].2008,150(1):15-24.
[6]Zhu L N,Ma J,Yang S D.Removal of phenol by activated alumina bed in pulsed high-voltage electric field.Journal of Environmental Sciences[J].2007,19(4):409-415.
[7]孙媛媛.芦竹活性炭的制备、表征及吸附性能研究[D].山东:山东大学,2014.
[8]唐小斌.臭氧-活性炭工艺处理山西地区引黄水库微污染水实验研究[D].黑龙江:哈尔滨工业大学,2014.
[9]孙会青,曲思建,王利斌.半焦的生产加工利用现状.洁净煤技术[J].2008,14(6):62-65.
[10]张芸,兰新哲,宋永辉.活性半焦(兰炭)烟气脱硫的研究进展.洁净煤技术[J].2008,14(1):65-69.
[11]Mahmoodi N M,Salehi R,Arami M.Removal from colored textile wastewater using activated carbon:kinetic and isotherm studies.Desalination[J].2010,267(1):107-113.
[12]卢春兰.碱活化法制备石油焦基活性炭及活化机理研究[D].山东:大连理工大学,2007.
[13]施薇,严素定,唐大平.改性花生壳对Cu2+的吸附.离子交换与吸附[J].2012,28(5):442-448.
[14]王湖坤,贺倩,韩木先.粉煤灰/壳聚糖复合材料制备及处理含重金属工业废水的研究.离子交换与吸附[J].2012,26(4):362-369.
[15]Sathian S,Radha G,Shanmugapriya V,Rajasimman M,Karthikeyan C.Optimization and kinetic studies on treatment of textile dye wastewater using Pleurotus floridanus.Applied Water Science[J].2013,3(1):41-48.
[16]Sathian S,Rajasimman M,Radha G,Shanmugapriya V,Karthikeyan C.Performance of SBR for the treatment of textile dye wastewater:Optimization and kinetic studies.Alexandria Engineering Journal[J].2014,53(2):417-426.
[17]Banerjee S,Chattopadhyaya M C,Srivastava V,Sharma Y C.Adsorption studies of methylene blue onto activated saw dust:Kinetics,equilibrium,and thermodynamic studies.Environmental Progress&Sustainable Energy[J].2014,33(3):790-799.
[18]Geethamani C K,Ramesh S T,Gandhimathi R,Nidheesh P V.Alkali-treated fly ash for the removal of fluoride from aqueous solutions.Desalination and Water Treatment[J].2014,52(19/20/21):3477-3488.
[19]章燕豪.吸附作用[M].上海:上海科学技术文献出版社,1989.