改性生物炭协同硫酸亚铁修复铬污染土壤  

Modified Biochar with Ferrous Sulfate for Remediation of Chromium Contaminated Soil

作　　者：裴一青 杨一鸣[1,2,3,4] 杨艺鹏 宋玲彦 Pei Yiqing;Yang Yiming;Yang Yipeng;Song Lingyan(Northwest University of Nationalities,School of Chemical Engineering,Lanzhou 730106,China;Key Laboratory of Envi-ronment-Friendly Composites of the State Ethnic Affairs Commission,Lanzhou 730106,China;Gansu Provincial Biomass Function Composites Engineering Re-search Center,Lanzhou 730106,China;Key Laboratory for Utility of Environment-friendly Composite Materials and Biomass in Universities of Gansu Province,Lanzhou 730106,China)

机构地区：[1]西北民族大学化工学院,甘肃兰州730106 [2]环境友好复合材料国家民委重点实验室,甘肃兰州730106 [3]甘肃省生物质功能复合材料工程研究中心,甘肃兰州730106 [4]甘肃省高校环境友好复合材料及生物质利用省级重点实验室,甘肃兰州730106

出　　处：《山东化工》2023年第4期208-212,共5页Shandong Chemical Industry

基　　金：中央高校创新团队项目(NO.31920190014)。

摘　　要：以玉米秸秆为原料,在限氧和高温条件下制备成生物炭,并加入KOH溶液对玉米秸秆生物炭进行碱改性处理,利用FTIR、SEM和TGA等测试技术对材料进行表征,考察材料的理化性质,并通过稳定化实验,研究改性生物炭协同硫酸亚铁对铬污染土壤的修复效果。结果表明,改性后生物炭表面的含氧官能团得到强化,出现明显的孔隙管道结构,呈现蜂窝形状,且具有较强的热稳定性。由稳定化实验结果可知,改性生物炭协同硫酸亚铁对铬污染土壤有良好的稳定化效果。最佳的稳定化修复条件为5%投加比例的KBC和7 d的养护时间。土壤中总Cr和Cr(VI)浸出浓度、Cr(VI)含量分别为0.144 mg/L和0.135 mg/L,22.53 mg/kg,均满足《污水综合排放标准》(GB 8978—1996)中总Cr和Cr(VI)的浸出限值1.5 mg/L和0.5 mg/L以及《土壤环境质量建设用地土壤污染风险管控标准》(GB 36600—2018)中第一类用地筛选值30 mg/kg的限值要求。With corn straw as raw material,under the condition of limited oxygen and high temperature preparation into biochar,and KOH solution was added to alkali-modified corn stover biochar.The materials were characterized by FTIR,SEM and TGA to investigate the physicochemical properties of the materials,and stabilization experiments were conducted to study the synergistic effect of modified biochar with ferrous surfate on chromium-contaminated soil.The results showed that the oxygen-containing functional groups on the surface of the modified biochar were strengthened,and an obvious pore-pipeline structure with a honeycomb shape appeared,and it had a strong thermal stability.From the results of stabilization experiments,it is clear that the modified biochar with ferrous sulfate has good stabilization effect on chromium-contaminated soil.The optimal stabilization remediation conditions were 5%of KBC at the dosage rate and 7 d of maintenance time.The leaching concentrations of total Cr and Cr(VI)and Cr(VI)in the soil were 0.144 mg/L and 0.135 mg/L and 22.53 mg/kg,respectively,which met the leaching limits of 1.5 mg/L and 0.5 mg/L for total Cr and Cr(VI)in the"Comprehensive Wastewater Discharge Standard"(GB 8978—1996)and the Soil Environmental Quality Construction Land Soil Pollution Risk Control Standards"(GB 36600—2018)in the first category of land screening value 30 mg/kg limit value requirements.

关 键 词：改性生物炭 硫酸亚铁 稳定化 铬污染土壤 

分 类 号：X53[环境科学与工程—环境工程]