纳米复合材料ZrO_(2)@rGO吸附脱除水溶液中的阿散酸  

ZrO_(2)@rGO Nanocomposites for Adsorptive Removal of Arsanilic Acid fromAqueous Solution

作　　者：朱孟亚 邹善娟 尤楠 ZHU Mengya;ZOU Shanjuan;YOU Nan(College of Petrochemical Engineering,Liaoning Petrochemical University,Fushun 113001,Liaoning,China)

机构地区：[1]辽宁石油与化工大学石油化工学院,辽宁抚顺113001

出　　处：《材料导报》2022年第17期30-35,共6页Materials Reports

基　　金：辽宁省自然科学基金-沈阳材料科学国家(联合)实验室联合开放基金(2015021019)。

摘　　要：阿散酸(ASA)是一种应用广泛的有机砷类兽药,因其潜在的环境危害而受到关注。本工作采用水热一锅法在还原氧化石墨烯(rGO)表面上原位生长了ZrO_(2)纳米颗粒,将制备得到的ZrO_(2)@rGO纳米复合材料用于吸附去除ASA。通过透射电镜和扫描电镜观察发现,直径为20~50 nm的ZrO_(2)纳米颗粒较均匀、致密地分布在rGO表面;XRD结果显示ZrO_(2)纳米颗粒的晶型为单斜晶和四方晶的混合相。吸附试验结果表明:ZrO_(2)@rGO对ASA的吸附容量为177.9 mg·g^(-1),其能够在45 min达到对ASA的吸附去除平衡;在pH=2.9~7.1时,pH值对ASA的吸附去除没有显著影响;当pH>7.1时,随着pH值的增大,ASA的吸附量变小;在25~45℃下,随着温度的升高,ZrO_(2)@rGO对ASA的吸附量也增大;当离子强度小于0.1 mol·L^(-1)时,离子强度对ZrO_(2)@rGO吸附去除ASA没有显著影响;经过五次吸附-解吸循环后,再生的ZrO_(2)@rGO对ASA的吸附量仍能达到新鲜ZrO_(2)@rGO吸附量的85%;ASA在ZrO_(2)@rGO表面的吸附过程可用Langmuir模型和准二级动力学方程来描述。Arsanilic acid(ASA),a widely used organic-arsenic veterinary drug,has greatly attracted attention due to its potential environmental threat.This work reported a ZrO_(2)@rGO nanocomposite with ZrO_(2)nanoparticles growing on reduced graphene oxide(rGO)by a one-pot method for adsorptive removal of ASA from aqueous solution.The ZrO_(2)nanoparticles 20—50 nm in diameter are relatively evenly and densely covered on the rGO surface according to the observation of transmission and scanning electron microscope.X-ray diffraction patterns of ZrO_(2)@rGO indicate the mixture of the monoclinic and tetragonal phases of ZrO_(2).The adsorptive capacity of ASA by the ZrO_(2)@rGO is 177.9 mg·g^(-1),and the adsorption equilibrium of ASA by the ZrO_(2)@rGO can be achieved within 45 min.The adsorption amount of ASA is independent of pH in the range of 2.9—7.1,decreases at pH>7.1 and increases with the increase in temperature from^(2)5℃to 45℃.The removal of ASA by the ZrO_(2)@rGO is independent of ionic strengths below 0.1 mol·L^(-1).After five cycles of the adsorption-desorption,the adsorptive amount of ASA by the regenerative ZrO_(2)@rGO can retain 85%of that by the fresh sorbents.The adsorption process of ASA by the ZrO_(2)@rGO can be described by the Langmuir and the pseudo-second-order equations.

关 键 词：纳米复合材料 有机砷 吸附去除 

分 类 号：O647.3[理学—物理化学]