果壳生物质炭的改性及其对DEP的吸附机理  

Study on the Modification of Nutshell Biochar and Its Sorption Mechanism for DEP

作　　者：范新会 郭笑盈[1] 王晓庆[1] 王昊彬 姜忠昱 邢永强[3] FAN Xinhui;GUO Xiaoying;WANG Xiaoqing;WANG Haobin;JIANG Zhongyu;XING Yongqiang(School of Ecology Environment,Zhengzhou University,Zhengzhou 450001;School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001;Henan Academy of Land and Resources Sciences,Zhengzhou 450001)

机构地区：[1]郑州大学生态与环境学院,郑州450001 [2]郑州大学化工学院,郑州450001 [3]河南省国土资源科学研究院,郑州450001

出　　处：《水土保持学报》2021年第5期336-345,353,共11页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(41601524,41701545,21706241);河南省科技攻关项目(172102110134)。

摘　　要：为探究改性前后生物质炭的理化属性变化及其对邻苯二甲酸二乙酯(DEP)的吸附机理,以椰子壳和花生壳为原料制备生物质炭,分别进行14%H_(3)PO_(4)改性和1.0 mol/L NaOH-30%H_(2)O_(2)联合改性处理。结果表明:改性后生物质炭的芳香化程度和含氧官能团含量增加,除C300N(经NaOH-H_(2)O_(2)改性的300℃—椰子壳生物质炭)外比表面积(SA)都增大。P800N(经NaOH-H_(2)O_(2)改性的800℃—花生壳生物质炭)有最大的SA(584.22 m^(2)/g),因此对DEP的吸附亲和力最高。经过NaOH-H_(2)O_(2)联合改性的生物质炭对DEP的有机碳标化分配系数K_(oc)(C_e=0.1S_w)值较高,对DEP的吸附亲和力更强。π-πEDA相互作用在所有生物质炭对DEP的吸附过程中发挥了重要的作用,而孔隙填充效应主导了原始生物质炭、经NaOH-H_(2)O_(2)改性的生物质炭和经H_3PO_4改性的800℃-生物质炭对DEP的吸附。与原始生物质炭相比,由氢键形成的水团簇作用抑制了经H_(3)PO_(4)改性的300,500℃制备的生物质炭对DEP的吸附。此外,氢键作用有助于增强低温(300℃)生物质炭对DEP的吸附亲和力。In this study,biochar were produced from coconut shell and peanut shell,and then modified with 14%H_(3)PO_(4)and 1.0 mol/L NaOH-30%H_(2)O_(2),respectively.The changes of physicochemical properties of biochar before and after modification and the sorption mechanism of diethyl phthalate(DEP)were studied.The results showed that the aromatization degree and the content of oxygen-containing functional groups of modified biochar increased,the specific surface area(SA)increased except C300N(the 300℃-coconut shell biochar modified by NaOH-H_(2)O_(2)).P800N(the 800℃-peanut shell biochar modified by NaOH-H_(2)O_(2))had the highest sorption affinity for DEP because of the largest SA(584.22 m^(2)/g).The sorption affinity of DEP by the NaOH-H 2 O 2 modified biochar was stronger because of the higher organic carbon partition coefficient K oc(Ce=0.1 S w)value.Theπ-πEDA interaction played an important role in the sorption of DEP by all biochar,while the pore-filling effect regulated the sorption of DEP by the original biochar,NaOH-H_(2)O_(2)modified biochar and H_(3)PO_(4)modified 800℃-biochar.The water clusters formed by hydrogen bonding inhibited the sorption of DEP by the 300℃-and 500℃-biochar modified by H_(3)PO_(4)compared with the original biochar.In addition,the hydrogen bonding was helpful to enhance the sorption affinity of low-temperature(300℃)biochar for DEP.

关 键 词：邻苯二甲酸二乙酯 生物质炭 改性处理 吸附机理 

分 类 号：X131.2[环境科学与工程—环境科学]