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论文类型：期刊论文

发表时间：2015-01-01

发表刊物：RSC ADVANCES

收录刊物：SCIE、EI、Scopus

卷号：5

期号：33

页面范围：25896-25903

ISSN号：2046-2069

摘要：Rod-like alumina materials were synthesized via a template-free hydrothermal method by using aluminum nitrate as precursor and urea as precipitating agent. The resulting alumina has a high specific surface area (up to 773 m(2) g(-1)) and an abundance of hydroxyl groups, giving it a good Cr(VI) removal efficiency. External factors were investigated, including contact time, adsorbent dose, initial concentration of adsorbate and pH. The maximum adsorption capacity for Cr(VI) was 39.1 mg g(-1), which is superior to most of the reported alumina adsorbents. The Al2O3 samples before and after Cr(VI) adsorption were also characterized by FT-IR and XPS analysis. The results show that the adsorption can be mainly ascribed to the ion exchange between the abundant hydroxyl groups on the alumina surface and chromium anions. Together with an outstanding adsorption-regeneration performance, it is anticipated that the assynthesized alumina materials are an attractive adsorbent for the removal of heavy metal ions from water.