华南师范大学学报（自然科学版）
華南師範大學學報（自然科學版）
화남사범대학학보（자연과학판）
JOURNAL OF SOUTH CHINA NORMAL UNIVERSITY （NATURAL SCIENCE EDITION）
2014年
2期
79-85
,共7页
纳米氧化铝%重金属Cr(Ⅵ)%比表面积%吸附
納米氧化鋁%重金屬Cr(Ⅵ)%比錶麵積%吸附
납미양화려%중금속Cr(Ⅵ)%비표면적%흡부
nano-alumina%Cr(Ⅵ)%surface area%adsorption
采用共沉淀法制备了γ型纳米氧化铝，颗粒直径在7～10 nm，比表面积为117.986 m2/g．以纳米氧化铝作为吸附剂，研究了纳米氧化铝对溶液中的Cr（Ⅵ）吸附特性，结果表明，纳米氧化铝的投加量为2 g/L， Cr（Ⅵ）的初始质量浓度为15 mg/L，初始pH 2时吸附效果最好，在4 h左右达到吸附平衡，去除率达96.1％．纳米氧化铝对溶液中的Cr （Ⅵ）的吸附动力学符合拟二级动力学模型，相关系数达0.945以上．吸附过程符合Freundlich等温方程，相关系数接近1．吸附过程是自发的放热过程，在低温条件下更有利于纳米氧化铝吸附溶液中的六价铬．
採用共沉澱法製備瞭γ型納米氧化鋁，顆粒直徑在7～10 nm，比錶麵積為117.986 m2/g．以納米氧化鋁作為吸附劑，研究瞭納米氧化鋁對溶液中的Cr（Ⅵ）吸附特性，結果錶明，納米氧化鋁的投加量為2 g/L， Cr（Ⅵ）的初始質量濃度為15 mg/L，初始pH 2時吸附效果最好，在4 h左右達到吸附平衡，去除率達96.1％．納米氧化鋁對溶液中的Cr （Ⅵ）的吸附動力學符閤擬二級動力學模型，相關繫數達0.945以上．吸附過程符閤Freundlich等溫方程，相關繫數接近1．吸附過程是自髮的放熱過程，在低溫條件下更有利于納米氧化鋁吸附溶液中的六價鉻．
채용공침정법제비료γ형납미양화려，과립직경재7～10 nm，비표면적위117.986 m2/g．이납미양화려작위흡부제，연구료납미양화려대용액중적Cr（Ⅵ）흡부특성，결과표명，납미양화려적투가량위2 g/L， Cr（Ⅵ）적초시질량농도위15 mg/L，초시pH 2시흡부효과최호，재4 h좌우체도흡부평형，거제솔체96.1％．납미양화려대용액중적Cr （Ⅵ）적흡부동역학부합의이급동역학모형，상관계수체0.945이상．흡부과정부합Freundlich등온방정，상관계수접근1．흡부과정시자발적방열과정，재저온조건하경유리우납미양화려흡부용액중적륙개락．
The alumina nanoparticles were synthesized by chemical precipitation process and characterized by BET , XRD and TEM.Results showed that the alumina nanoparticles were γ-alumina phase , the diameter of the particles and the specific surface area of alumina nanoparticles were between 7~10 nm and 117.986 m2/g, respectively . The adsorption characteristics of alumina nanoparticles were investigated .The results indicated that the removal ef-ficiency of Cr (Ⅵ) can reach 96.1% when the initial pH value was 2, the dosage of alumina nanoparticles was 2 g/L and Cr (Ⅵ) concentration was 15 mg/L within 4 hours .Results of kinetics showed that the adsorption of Cr (Ⅵ) by alumina nanoparticles could well described by the pseudo second order kinetic model ( R2≥0.945 ) .Iso-therm adsorption capacity of alumina nanoparticles can fit well to Freundlich equation .Additionally , the value of the correlation (R2) for the isotherm model was close to 1.It was found that the adsorption was the process of spon-taneity and exotherm , and it was more effective for the removal of hexavalent chromium from aqueous solution at lower temperatures .
