摘要
选矿废水中存在的黄药严重危害矿山周围生态环境,对其处理迫在眉睫。以钛酸丁酯为基底,利用芽孢杆菌合成TiO_(2)@芽孢杆菌,将其应用于黄药废水处理,以黄药降解率为指标,考察了TiO_(2)@芽孢杆菌菌液浓度、钛酸丁酯用量、黄药初始浓度、废水初始pH值对黄药降解影响及动力学规律,并通过紫外分光光度计与离子色谱探究黄药的降解机理。结果表明:TiO_(2)@芽孢杆菌矿化合成TiO_(2)为无定型;TiO_(2)@芽孢杆菌光降解黄药不同菌液浓度、钛酸丁酯用量、黄药初始浓度的动力学模型均符合伪一级动力学模型;TiO_(2)@芽孢杆菌在废水初始pH=4~9范围内适应性较好,在TiO_(2)@芽孢杆菌菌液浓度为90 mL/L、钛酸丁酯为150μL/L、废水黄药初始浓度为10 mg/L、初始pH=8、光照强度为250 W的最佳试验条件下光照72 h,黄药降解率达到96.3%;TiO_(2)@芽孢杆菌光降解黄药过程中各种作用大小为:同化作用>TiO_(2)光催化作用>吸附作用;黄药中硫元素能被TiO_(2)@芽孢杆菌转化为SO42-,最终被降解为CO_(2)、H2O、SO_(4)^(2-)等小分子物质。合成的TiO_(2)@芽孢杆菌对黄药废水处理具有实际应用价值。
The xanthate present in the mineral processing wastewater seriously harms the ecological environment around the mine,and its treatment is urgent.In this study,butyl titanate was used as the substrate to synthesize TiO_(2)@Bacil⁃lus using Bacillus.TiO_(2)@Bacillus was applied to the treatment of xanthate wastewater,and the degradation rate of xanthate was used as an indicator to investigate the influence of TiO_(2)@Bacillus bacteria liquid concentration,butyl titanate dosage,initial concentration of xanthate,and initial pH of the wastewater on the degradation of xanthate.And kinetic laws,and ex⁃plore the degradation mechanism of xanthate by ultraviolet spectrophotometer and ion chromatography.The results show that:TiO_(2)@Bacillus mineralization synthesis of TiO_(2) is amorphous;The kinetic models of TiO_(2)@Bacillus photodegradation of xan⁃thate in different bacterial liquid concentrations,the dosage of butyl titanate,and the initial concentration of xanthate are all in line with the pseudo-first-order kinetic model;TiO_(2)@Bacillus has good adaptability in the range of wastewater initial pH=4~9.The concentration of TiO_(2)@Bacillus bacteria solution is 90 mL/L,butyl titanate is 150μL/L,and the initial concentra⁃tion of waste water xanthate is 10 mg/L,initial pH=8,and light intensity of 250 W,the degradation rate of xanthate reached 96.3%after 72 h of illumination;The various effects of TiO_(2)@Bacillus in the process of photodegradation of xanthate are:as⁃similation>TiO_(2) photocatalysis>adsorption;The element S in xanthate can be converted into SO^(4)^(2-)by TiO_(2)@Bacillus,and fi⁃nally degraded into small molecules such as CO_(2),H2O,SO42-,etc.The synthesized TiO_(2)@Bacillus has practical application value in the treatment of xanthate wastewater.
作者
李官超
祝瑄
滕青
刘生玉
杨志超
LI Guanchao;ZHU Xuan;TENG Qing;LIU Shengyu;YANG Zhichao(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《金属矿山》
CAS
北大核心
2021年第8期186-195,共10页
Metal Mine
