La_(2)O_(3)负载非金属矿物基陶粒制备及其除磷性能研究  

Preparation of La_(2)O_(3)loaded non-metallic mineral based ceramsite and its phosphorus removal performance

作　　者：冯宇博 梁欢[1] 田承涛 邢丽静 郝禅光 何东升[1] 师懿 FENG Yubo;LIANG Huan;TIAN Chengtao;XING Lijing;HAO Changuang;HE Dongsheng;SHI Yi(School of Resources and Safety Engineering,Wuhan Institute of Technology,Wuhan Hubei 430074;Hubei Sanning Chemical Industry Co.,Ltd.,Yichang Hubei 443200;Wuhan Zhongdi Green Environmental Protection Technology Co.,Ltd.,Wuhan Hubei 430223)

机构地区：[1]武汉工程大学资源与安全工程学院,湖北武汉430074 [2]湖北三宁化工股份有限公司,湖北宜昌443200 [3]武汉中地格林环保科技有限公司,湖北武汉430223

出　　处：《环境污染与防治》2023年第9期1218-1222,1228,共6页Environmental Pollution & Control

基　　金：湖北省技术创新专项(对外科技合作类)(No.X19S012);湖北省尾矿(渣)资源化利用工程技术研究中心项目(No.ZYYD201900072)。

摘　　要：对硅藻土和蒙脱石混合物进行La_(2)O_(3)负载制备了La_(2)O_(3)负载非金属矿物基陶粒,研究初始pH、初始总磷浓度、陶粒投加量和干扰因子对陶粒除磷性能的影响。结果表明,在陶粒投加量为40 g/L,初始pH=9.0,初始总磷质量浓度为100 mg/L时,磷去除效率较好,将实际含磷废水稀释并调整至接近优化除磷条件,960 min时磷去除率可达到98.9%,陶粒的磷吸附量为2.57 mg/g,干扰因子的影响也不大。陶粒吸附磷的过程符合准二级动力学模型和Langmuir吸附等温线模型,说明磷在陶粒表面发生多分子层物理吸附与化学吸附,且化学吸附为主要的限制性因素和控制条件,45℃时最大理论吸附量为10.1314 mg/g。陶粒表面La 3+和Si—OH活性基团为吸附提供了有效的活性位点,在弱碱性溶液中除磷效果最好,静电吸附在陶粒除磷过程中发挥了重要作用。The mixture of diatomite and montmorillonite was loaded with La_(2)O_(3)to prepare La_(2)O_(3)loaded non-metallic mineral based ceramsite.The effects of initial pH,initial total phosphorus concentration,ceramsite dosage and interference factors on phosphorus removal performance of ceramsite were studied.Results showed that when ceramsite dosage was 40 g/L,initial pH=9.0,and initial total phosphorus concentration was 100 mg/L,phosphorus removal efficiency was excellent.Phosphorus removal rate reached 98.9%after 960 min when actual phosphorus containing wastewater was adjusted close to the optimized conditions.And the interference factors had little effect.The adsorption process of ceramsite on phosphorus conformed to the pseudo-second-order kinetic model and Langmuir isotherm adsorption model,which indicated that multi-molecular layer physical and chemical adsorption occurred on the surface of ceramsite,but chemical adsorption was the main limitation factor and regulation condition.The maximum theoretical adsorption amount of ceramsite was 10.1314 mg/g at 45℃.La 3+and Si—OH active group provided active points for adsorption.It was better to adsorb phosphorus in weak alkaline solution.Electrostatic adsorption played an important role,too.

关 键 词：陶粒 竞争吸附 总磷 La_(2)O_(3) 

分 类 号：X703[环境科学与工程—环境工程] TQ424[化学工程]