CAJ | 학술논문

选用甘蔗叶、木薯杆、水稻秸秆和蚕沙作为原料，分别在300、700℃下限氧控温热解制备生物质炭，采用电镜扫描（SEM）观察生物质炭表面孔隙结构，用红外光谱（ FTIR）、Boehm滴定方法对表面官能团的种类和含量进行分析，并研究不同生物质炭在不同镉（Cd）-阿特拉津（AT）初始浓度、不同pH值下对Cd、AT的吸附特征。结果发现，同种原材料制备的生物质炭，高温条件（700℃）热解与低温（300℃）相比，表面的官能团数量较少，但孔隙结构更加明显。不同生物质炭对Cd和AT的吸附符合准二级动力学方程，拟合系数均大于0.998。生物质炭能有效吸附水溶液中的Cd和AT，初始浓度越大，吸附量越大，且高温炭的单位吸附量大于低温炭。相同材料制备的生物质炭在溶液pH＝6时对Cd的吸附量高于pH＝4时的吸附量，而对AT的吸附能力则是在低pH值时较大。高温制备的水稻秸秆炭和蚕沙炭对Cd的吸附效果较明显，甘蔗叶炭对AT的吸附量最大。
선용감자협、목서간、수도갈간화잠사작위원료，분별재300、700℃하한양공온열해제비생물질탄，채용전경소묘（SEM）관찰생물질탄표면공극결구，용홍외광보（ FTIR）、Boehm적정방법대표면관능단적충류화함량진행분석，병연구불동생물질탄재불동력（Cd）-아특랍진（AT）초시농도、불동pH치하대Cd、AT적흡부특정。결과발현，동충원재료제비적생물질탄，고온조건（700℃）열해여저온（300℃）상비，표면적관능단수량교소，단공극결구경가명현。불동생물질탄대Cd화AT적흡부부합준이급동역학방정，의합계수균대우0.998。생물질탄능유효흡부수용액중적Cd화AT，초시농도월대，흡부량월대，차고온탄적단위흡부량대우저온탄。상동재료제비적생물질탄재용액pH＝6시대Cd적흡부량고우pH＝4시적흡부량，이대AT적흡부능력칙시재저pH치시교대。고온제비적수도갈간탄화잠사탄대Cd적흡부효과교명현，감자협탄대AT적흡부량최대。
Biochars have recently been used to remediate water contaminated by heavy metals and organic pollutants. In this paper, four biochars derived from organic wastes(sugarcane top, cassava stem, rice straw and silkworm excrement)collected from Guangxi were select-ed to examine their pore structure by Scanning Electron Microscope(SEM), type and quantity of total oxygen-containing functional groups via Fourier Transform Infrared Spectroscopy(FTIR)and Boehm titration, and adsorption characteristics of Cd2+ and atrazine(AT)at dif-ferent initial concentrations of Cd and AT and different pH values. Biochars obtained at high pyrolytic temperature(700℃)had more pores and basic functional groups but fewer acid functional groups than those at low pyrolytic temperature(300℃). The adsorption of Cd and AT by the biochars could be well characterized with pseudo-second-order kinetic model. The Cd and AT adsorption increased with initial con-centrations of Cd and AT. The adsorption efficiencies of Cd and AT were greater for biochars at 700℃than 300℃. Biochars adsorbed more Cd but less AT at pH 6 than pH 4. Rice straw- and silkworm excrement-derived biochars had greater adsorption capacity for Cd2+, while sugarcane top derived-biochar had more adsorption for AT.