Structure and Properties of Noncrystalline Nano-Al(OH)3 Reclaimed from Carbonized Residual Wastewater Treatment Sludge

详细信息    查看全文

• 作者：Jinlong Zou ; Ying Dai ; Chungui Tian ; Kai Pan ; Baojiang Jiang ; Lei Wang ; Wei Zhou ; Guohui Tian ; Xue Wang ; Zipeng Xing ; Honggang Fu
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：April 17, 2012
• 年：2012
• 卷：46
• 期：8
• 页码：4560-4566
• 全文大小：360K
• 年卷期：v.46,no.8(April 17, 2012)
• ISSN：1520-5851

文摘

Performance of wastewater treatement sludge-carbon (SC) can be evidently improved by removing the inorganic fractions. A novel investigation for recovery of Al from acid leaching of SC and synthesis of nano-Al(OH)₃ has been conducted. Results show that the sodium aluminates with high purity can be obtained by effectively dissolving the inorganic fractions from SC and by further removing the impurities (Fe³⁺, Ca²⁺, Mg²⁺, S⁴⁺, and P³⁺). Highly dispersed Al(OH)₃ with high S_BET is obtained at pH = 6. The peaks of 鈭扖H₂鈥?vibration and the C1s peaks (binding energies of 284.6 eV) imply that polyethylene glycol 1000 (PEG-1000) is chemically adsorbed on the surface of Al(OH)₃ samples, which is propitious to reduce the hydrogen bonds between water molecules and surface 鈭扥H groups to prevent hard agglomeration. The stretching vibration peaks of [AlO₂]^{鈭?/sup> and the Na1s peaks confirm that a trace of sodium aluminate (NaAl(OH)₄, Na+(H₂O)₄[Al(OH)₄鈥?/sup>], or the dehydrated monomers) is retained in the prepared Al(OH)₃. The main phase transformation for calcination (鈮?00 掳C) of the SC-derived Al(OH)₃ is from amorphous Al(OH)₃ to amorphous A1₂O₃. Here we highlight that production of Al(OH)₃ and SC from sludge provides the potential application in significant quantities that can revolutionize the handling of such kinds of harmful waste.}