富钙/铁抗生素菌渣生物炭的制备及其对磷酸盐的吸附特性和机理  

Fabrication of Biochars Derived from Calcium/Iron-Rich Antibiotic Fermentation Residue and Their Phosphate Adsorption Performances and Mechanisms

作　　者：陈钦鹏 陈运超 张铭栋 何敏贞 马增岭[2] 穆景利 CHEN Qinpeng;CHEN Yunchao;ZHANG Mingdong;HE Minzhen;MA Zengling;MU Jingli(College of Geography and Oceanography,Fuzhou Institute of Oceanography,Minjiang University,Fuzhou 350108,China;College of Life and Environmental Sciences,Wenzhou University,Wenzhou 325035,China;School of Environmental and Safety Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]闽江学院地理与海洋学院,福州海洋研究院,福建福州350108 [2]温州大学生命与环境科学学院,浙江温州325035 [3]福州大学环境与安全工程学院,福建福州350108

出　　处：《环境科学研究》2023年第7期1416-1425,共10页Research of Environmental Sciences

基　　金：福州海洋研究院科技项目(No.2021F10)。

摘　　要：富含钙/铁元素(Ca/Fe)的抗生素菌渣既是国家规定的危险废物,又具有显著的生物质和金属资源属性,但现有处理技术鲜有关注这二者的协同回收利用;同时,现有研究对菌渣生物炭的应用探索较少.针对于此,该研究以富Ca/Fe妥布霉素菌渣为原料,用水热法和热解法分别制备了水热炭和热解炭,并探索其在吸附除磷方面的应用.结果表明:由富Ca/Fe妥布霉素菌渣制得的水热炭和热解炭中Ca和Fe元素含量均较高;但热解炭无需改性便具有较强吸附磷能力和磁性,其中600℃制备的热解炭(PC-600)最适合用于吸附水中磷酸盐.对于磷酸盐的吸附,PC-600更适用于碱性环境,受Cl^(−)、NO_(3)^(−)影响较小,而HCO_(3)^(−)促进吸附过程;PC-600吸附速度较快,平衡时间仅为420 min;吸附过程符合Langmuir等温吸附模型,最大吸附容量达108 mg/g(35℃下);吸附机理主要为化学沉淀和配体交换.研究显示,热解法是处理富Ca/Fe抗生素菌渣较有潜力的方法,所获得的生物炭能够应用于废水中磷酸盐的去除或回收.该研究可实现富Ca/Fe菌渣中生物质和金属资源协同回收利用,为菌渣生物炭的应用提供参考,同时为水体磷污染治理提供高效吸附材料.Calcium(Ca)/Iron(Fe)-rich antibiotic fermentation residue(AFR)is a hazardous waste in China and is also biomass and metal resources.However,a few studies have focused on the concurrent recycle of the two resources.Meanwhile,information about the application of AFR-derived biochars is still limited.In this study,the Ca/Fe-rich tobramycin fermentation residue was used for the preparation of hydrochars and pyrochars by hydrothermal and pyrolysis methods,respectively,and the adsorption performance and mechanism of the hydrochars and pyrochars for phosphate were also investigated.The results show that both hydrochars and pyrochars contained high content of Ca and Fe.The pyrochars exhibited higher affinity for phosphate and stronger magnetism without further modifications than the hydrochars.Among the pyrochars,the one prepared at 600℃(denoted as PC-600)had the highest adsorption capacity(45.5 mg/g)for phosphate,and it was selected for the batch adsorption experiments.In the pH-dependent experiments,it is found that PC-600 exhibited better adsorption performance for phosphate under the alkaline conditions.When there were anions in the solution,the adsorption capacity of PC-600 was almost not affected by Cl−and NO3−and was inhabited by SO_(4)^(2−)and CO_(3)^(2−).Interestingly,HCO_(3)^(-) itself showed little effect on the adsorption of phosphate and increased the solution pH.Therefore,the apparent adsorption capacity of PC-600 for phosphate was significantly promoted by the presence of HCO3−(P<0.05).Furthermore,PC-600 exhibited rapid kinetics with an equilibrium time of 420 min.The isotherm data could be fitted well by the Langmuir model,and the maximum adsorption capacity(qm)reached 108 mg/g at 35℃.Characterizations revealed that the main adsorption mechanisms included precipitation and ligand exchange.The results showed pyrolysis is a promising method to treat Ca/Fe-rich AFR,and the obtained Ca/Fe-rich pyrochars can be used as adsorbents for phosphate removal or recovery from wastewater.In summary,this s

关 键 词：抗生素菌渣 生物炭 热解 吸附 磷酸盐 

分 类 号：X787[环境科学与工程—环境工程]