载镁香蕉秆基生物炭对氮磷的吸附性能研究  

Research on adsorption properties of Mg-loaded banana stalk biochar on nitrogen and phosphorus

作　　者：蒋艳红[1,2,3] 李安玉 严发 邓华 JIANG Yan-hong;LI An-yu;YAN Fa;DENG Hua(School of Environment and Resources,Guangxi Normal University,Guilin 541006,China;School of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China;Key Laboratory of Lava Ecology and Environmental Change,Guangxi Normal University,Guilin 541006,China)

机构地区：[1]广西师范大学环境与资源学院,广西桂林541006 [2]桂林理工大学环境科学与工程学院,广西桂林541004 [3]溶岩生态与环境变化研究重点实验室,广西桂林541006

出　　处：《农业资源与环境学报》2018年第6期559-567,共9页Journal of Agricultural Resources and Environment

基　　金：广西高校科学技术项目(KY2015YB033);岩溶生态与环境变化研究广西高校重点实验室基金项目(YRHJ15Z009);广西普通高校研究生科研创新计划项目(XYCSZ2018067)

摘　　要：以香蕉秸秆为原料,氯化镁(MgCl_2)为改性剂,通过限氧热解法(温度673 K)制备生物质炭。利用扫描电镜、傅里叶红外光谱、X射线衍射等技术分析了镁改性生物质炭对氮、磷的吸附机理。结果表明,通过镁改性,生物质炭对氮、磷的吸附量得到显著提高,最大吸附量分别达13.80、18.21 mg·g^(-1);对氮、磷的等温吸附曲线均符合Langmuir曲线,为单层吸附,吸附机理主要以化学吸附为主;吸附平衡时间约为150 min,氨氮和磷的吸附动力学均符合准二级动力学拟合方程,吸附过程受多步骤控制。该载镁生物质炭可以作为潜在吸附剂去除废水和富营养化水体中过量的氮、磷。Taking banana stem as raw material,magnesium chloride(MgCl2)as modifier,biochar was prepared by limiting oxygen pyrolysis(temperature 673 K).The adsorption of magnesium modified biochar on nitrogen and phosphorus was analyzed by scanning electron microscope(SEM),Fourier transform infrared spectroscopy(FTIR)and X-ray diffraction(XRD).Results showed that magnesium modification significantly increased nitrogen and phosphate adsorption with adsorption maximum calculated at 13.80 mg·g^-1 and 18.21 mg·g^-1,respectively.The Langmuir isotherm model fitted the nitrogen and phosphorous absorption isotherm curves well and the sorption mechanism was chemosorption.The absorption balancing time was about 150 minutes.The adsortion process of ammoniacal nitrogen and phosphorous which under the control of multiple steps were best described by the pseudo-second-order kinetic model.Overall,Mg-loaded biomass could offer a protential alternative of adsorbent for nitrogen and phosphorous removal from waste water and eutrophic water.

关 键 词：香蕉秸秆 镁改性生物炭 氮 磷 吸附性能 

分 类 号：X71[环境科学与工程—环境工程]