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首页> 外文期刊>Environmental Science & Technology >Preparation and Evaluation of Titanium-Based Xerogel as a Promising Coagulant for Water/Wastewater Treatment
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Preparation and Evaluation of Titanium-Based Xerogel as a Promising Coagulant for Water/Wastewater Treatment

机译：钛基干凝胶作为水/废水处理有潜力的混凝剂的制备与评价

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摘要

The nontoxicity of titanium (Ti) and the potential to produce valuable photocatalysts from the final coagulated sludge constitute the main advantages of Ti-based coagulants over conventional ones. However, the low effluent pH and the too-fast hydrolysis limit the wide application of Ti-salt coagulants. Prehydrolysis, to some extent, is helpful to improve the coagulation performance of Ti-salt coagulants. However, the prehydrolyzed polytitanium chloride (PTC) still suffers from narrow applicable dose/pH range. A novel and efficient Ti-based coagulant, denoted as titanium xerogel coagulant (TXC), was successfully prepared by the sol-gel method with TiCl_4 as the precursor and acetylacetone as a modifying agent. Compared with TiCl_4 a PTC, and a commercial polyferric sulfate, the resulting TXC possessed a larger floc size, better settling property, and wider applicable coagulant dose/pH range. Moreover, the effluent pH after TXC coagulation was not significantly reduced, avoiding the corrosion problem sometimes caused by the low effluent pH. TXC exhibited good coagulation performance for several real wastewaters, especially for the wastewaters of low turbidity. These results demonstrate that gelation was a more effective strategy than prehydrolysis to overcome the inherent weaknesses of Ti salts as a type of promising coagulants.
机译：钛（Ti）的无毒性和从最终的凝结污泥中产生有价值的光催化剂的潜力构成了钛基凝结剂相对于传统凝结剂的主要优势。但是，废水pH值低和水解太快限制了钛盐凝结剂的广泛应用。预水解在一定程度上有助于提高钛盐凝结剂的凝结性能。但是，预水解的聚钛氯化物（PTC）仍然适用的剂量/ pH范围狭窄。采用溶胶-凝胶法，以TiCl_4为前驱体，以乙酰丙酮为改性剂，成功制备了新型高效的钛基凝结剂，称为钛干凝胶凝结剂（TXC）。与TiCl_4，PTC和市售的聚硫酸铁相比，所得TXC具有更大的絮凝物尺寸，更好的沉降性和更宽的适用凝结剂剂量/ pH范围。而且，TXC凝结后的废水pH值没有显着降低，避免了有时因废水pH值低而引起的腐蚀问题。 TXC对几种实际废水，特别是对于低浊度废水，具有良好的混凝性能。这些结果表明，凝胶化是一种比预水解更有效的策略，可以克服作为一种有前途的凝结剂的钛盐固有的弱点。

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  • 来源
    《Environmental Science & Technology》 |2016年第17期|9619-9626|共8页
  • 作者

    Xiaomeng Wang; Minghui Li; Xiaojie Song; Zhihao Chen; Bingdang Wu; Shujuan Zhang;

  • 作者单位

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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