Preparation and Evaluation of Titanium-Based Xerogel as a Promising Coagulant for Water/Wastewater Treatment

• DOI: 10.1021/acs.est.6b03321
• Publication Date: 2016-08-16T17:47:41Z
• Authors: Xiaomeng Wang; Minghui Li; Xiaojie Song; Zhihao Chen; Bingdang Wu; Shujuan Zhang
• Keywords: Turbidity; Settling

The nontoxicity of titanium (Ti) and the potential to produce valuable photocatalysts from final coagulated sludge constitute main advantages Ti-based coagulants over conventional ones. However, low effluent pH too-fast hydrolysis limit wide application Ti-salt coagulants. Prehydrolysis, some extent, is helpful improve coagulation performance prehydrolyzed polytitanium chloride (PTC) still suffers narrow applicable dose/pH range. A novel efficient coagulant, denoted as xerogel coagulant (TXC), was successfully prepared by sol–gel method with TiCl4 precursor acetylacetone a modifying agent. Compared TiCl4, PTC, commercial polyferric sulfate, resulting TXC possessed larger floc size, better settling property, wider Moreover, after not significantly reduced, avoiding corrosion problem sometimes caused pH. exhibited good for several real wastewaters, especially wastewaters turbidity. These results demonstrate that gelation more effective strategy than prehydrolysis overcome inherent weaknesses Ti salts type promising