碱热改性生物炭的除氟特性及吸附性能研究

Fluoride Removal and Adsorption by Alkali-thermal Modified Biochar Adsorbent

地下水氟离子含量过高对居民饮用水的安全利用造成严重影响。采用碱热改性方式处理了葵花籽壳制备成的改性生物炭吸附剂,对其进行了表面结构分析,采用吸附批试验研究了其吸附动力学过程,并考察了pH值对吸附过程的影响。结果表明,用碱热改性生物炭吸附剂具有粗糙的表面,对水中的氟离子具有较高的吸附能力,其吸附过程符合Lagergren准二级动力学方程。在pH值6~8范围内具有最好的吸附能力,pH值过低或过高都不利于氟离子的吸附。碱热改性生物炭在处理高氟水领域具备较好的应用前景。

The high fluorine ion content of groundwater has a serious impact on the safe use of drinking water.The modified biochar adsorbent prepared by sunflower shell was treated by alkali thermal modification method,the surface structure was analyzed,the adsorption batch test was used to study its adsorption dynamics process,and the effect of pH on the adsorption process was investigated.The results show that alkaline thermo-modified biochar adsorbent has a rough surface and a high adsorption capacity for fluorine ions in water,and the adsorption process conforms to Lagergren's quasi-secondary dynamic equation.In the pH range of 6 to 8 has the best adsorption capacity,pH is too low or too high are not conducive to fluorine ion adsorption.Alkaline thermally modified biochar has good application prospects in the field of treating high fluorine water.