摘要
采用高温煅烧对天然牡蛎壳进行改性处理，并初步研究了天然牡蛎壳和经过不同煅烧温度处理后的牡蛎壳样品对废水中磷的吸附作用。采用TGA-DTA、XRD、SEM分别对天然牡蛎壳的热分解历程和不同温度烧结后所得的改性牡蛎壳的相组成和微观结构进行研究。结果表明：在相同的条件下，天然牡蛎壳粉对废水中磷的吸附效果较差；牡蛎壳经过650-800℃煅烧处理后，其对废水中磷的吸附性能明显提高。当煅烧温度为750℃时，牡蛎壳煅烧物对废水中磷的去除率可以达到99％。因此牡蛎壳经过750℃煅烧处理后，是一种固磷性能较好的新型钙基除磷剂。
Raw oyster shells were modified with different temperatures of calcinations, the phosphorus adsorption capacities of raw oyster shells and modified waste oyster shells were studied. The thermal decomposition of the raw oyster shell was studied by TGA-DTA. The phase transformation and microstrueture of raw oyster shells calcined at diferent tem- perature were studied by X-raydiffraction（XRD）and SEM. It indicated that oyster shells pyrolysed at 650℃-800℃ was ef- fective in removing phosphorus pollutant. In comparison, raw oyster shells removed a inferior phosphate from wastewater, whereas pyrolysis of waste oyster shells under 750℃ transformed this material into a sustainable reagent for efficient（up to 99 %）removal of phosphates from wastewater. It proved that the oyster shells pyrolysed at 750℃ could be used as adsor- bent to remove phosphorus pollution.
出处
《化工新型材料》
CAS
CSCD
北大核心
2014年第3期154-156,共3页
New Chemical Materials
基金
广东省科技计划项目(2011B031200007)
广东省科技计划项目(2012B010500026)
关键词
牡蛎壳
吸附
磷
煅烧
oyster shell, phosphorus, adsorption, pyrolysis
