选矿废水光催化还原协同吸附除磷的试验研究  

Study on Phosphate Removing in Mineral Processing Wastewater by Photocatalytic Reduction Assisted Absorption

作　　者：张义[1] 夏世斌[1] 张一敏[1] 李红丽[2] 刘淑洁[2] 刘茜[2] 

机构地区：[1]武汉理工大学资源与环境工程学院,武汉430070 [2]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《武汉理工大学学报》2011年第1期117-120,共4页Journal of Wuhan University of Technology

基　　金：国家"十一五"科技支撑计划重点项目(2007BAB15B00;2008BAC41B00)

摘　　要：为了进一步提高赤铁矿酸浸含磷废水的除磷效果,利用负载Sr掺杂TiO2薄膜的新型陶瓷滤球进行光催化还原协同吸附去除赤铁矿酸浸废水磷酸盐的试验研究,并考察了空穴捕获剂种类、甲酸用量、催化剂用量和初始磷浓度等因素对选矿废水磷酸盐光催化还原去除性能的影响。结果表明:Sr掺杂TiO2薄膜可光催化还原去除选矿废水中磷酸盐;负载TiO2薄膜陶瓷滤球磷酸盐去除率较吸附去除可进一步提高约9.1%;甲酸可作为最合适的空穴捕获剂;对于初始pH 2.53、磷浓度63.4 mg/L的实际赤铁矿酸浸废水,甲酸和TiO2最佳用量分别为60 mmol/L和4 g/L,磷去除率可达99.95%;酸浸废水磷酸盐光催化还原去除符合一级反应动力学方程,反应速率与初始磷浓度成正比。Photocatalytic reduction assisted absorption of phosphate in hematite acid picking milling wastewater was innovatively performed in the presence of ceramics filters coated with TiO2 and Sr in a batch reactor in order to enhance phosphate removing.Effects of hole scavengers,concentration of formic acid,dosage of immobilized titanium dioxide film and the initial phosphate concentration on the phosphate removing have been investigated.Research results indicated that the phosphate in mineral processing wastewater could be removed by photocatalytic reduction assisted absorption.The optimum amount of formic acid and titanium dioxid were 60 mmol/L and 4 g/L,respectively,and the phosphate removal could reach 99.95% when used to treat the actual mineral processing wastewater with initial pH 2.53 and initial phosphate concentration 63.4 mg/L.The process of photocatalytic decmpositiom of phosphate shows that it is a first-order reaction,and the reaction rate is directly proportional to the reactant＇s initial concentration.

关 键 词：二氧化钛薄膜 锶 光催化还原 吸附 除磷 

分 类 号：X131.2[环境科学与工程—环境科学] TQ085[化学工程]