硼改性牡蛎壳粉吸附磷酸盐的性能探究  

Study on adsorption performance of phosphateby boron-modified oyster shell powder

作　　者：王文清 万云霄 黄岚 WANG Wenqing;WAN Yunxiao;HUANG Lan(School of Chemical and Environmental Engineering,Wuhan Polytechnic University,Wuhan 430023,China)

机构地区：[1]武汉轻工大学化学与环境工程学院,武汉430023

出　　处：《武汉轻工大学学报》2024年第5期80-85,共6页Journal of Wuhan Polytechnic University

摘　　要：为评估牡蛎壳粉对磷酸盐的去除能力,以牡蛎壳为原料,掺杂一定量的氧化硼进行高温煅烧制得硼改性牡蛎壳粉,考察其对水溶液中磷酸盐的吸附去除行为。结果表明,硼改性比例为3%、投加量为4 g/L、溶液pH达12时,在45℃下对20 mg/L的磷酸盐溶液吸附4 h,去除率达95%;FTIR图表明吸附剂的主要官能团为-OH、C=C、Ca-O、C-O-C和C-H;XRD图说明吸附剂材料的主要晶型为CaCO_(3);等温模型拟合结果表明硼改性比例为3%的改性牡蛎壳粉吸附磷酸盐的过程为单层吸附,是能量均匀的吸附机制;动力学模型说明吸附过程主要属于化学吸附,表明控制吸附反应速率的主要步骤为吸附剂含有的物质与磷酸根离子的结合。研究可为牡蛎壳的资源化利用提供理论依据。To evaluate the phosphate removal ability of oyster shell powder,oyster shell was used as raw material and doped with a certain amount of boron oxide for high-temperature calcination to obtain boron modified oyster shell powder.Its adsorption and removal behavior of phosphate in aqueous solution was investigated.The results showed that when the boron modification ratio was 3%,the dosage was 4 g/L,and the solution pH was 12,the adsorption removal rate of 20 mg/L phosphate solution reached 95%at 45℃for 4 hours.FTIR chart showed that the main functional groups of the adsorbent were-OH,C=C,Ca-O,C-O-C,and C-H.The XRD pattern indicated that the main crystal form of the adsorbent material is CaCO_(3).The isothermal model fitting results indicated that the adsorption process of phosphate by modified oyster shell powder with a boron modification ratio of 3%was a single-layer adsorption,which was an energy uniform adsorption mechanism.The kinetic model showed that the adsorption process mainly belonged to the chemical adsorption process,which suggests that the main step controlling the adsorption reaction rate is the binding of the substances contained in the adsorbent with phosphate ions.This study can provide a theoretical basis for the resource utilization of oyster shells.

关 键 词：牡蛎壳粉 改性 磷酸盐 吸附 

分 类 号：X703[环境科学与工程—环境工程]