吸附剂对净水型透水混凝土性能的影响

Effect of Adsorbents on the Performance of Water Purifying Pervious Concrete

摘要:

通过向透水混凝土中引入低粘度壳聚糖改性硅藻土和坡缕石吸附剂，制备了具有净水功能的透水混凝土. 在明确壳聚糖掺杂比例对改性硅藻土和坡缕石的Cu2+去除率及单位吸附总量的影响后，进一步研究了吸附剂掺量对透水混凝土的NH4-N和Cu2+去除率、透水性以及抗压强度的影响. 结果表明，改性硅藻土和坡缕石的Cu2+吸附能力分别提高了约1.3倍和2.2倍. 将其掺入透水混凝土中不仅改善了孔隙结构，还显著增强了对NH4-N和Cu2+的去除效果. 随着吸附剂掺量的增加，尽管抗压强度略有下降，但在适宜掺量下仍能满足透水混凝土的最低等级要求，并可有效提升其透水性能.

Abstract:

By incorporating low-viscosity chitosan-modified diatomite and palygorskite as adsorbents into pervious concrete, a new type of pervious concrete with water purification capabilities was developed. After clarifying the influence of the chitosan doping ratio on the Cu2? removal efficiency and unit adsorption capacity of the modified diatomite and palygorskite, the effects of adsorbent dosage on the removal rates of NH??-N and Cu2?, as well as on the permeability and compressive strength of the pervious concrete, were further studied. The results show that the Cu2? adsorption capacities of the modified diatomite and palygorskite increased by approximately 1.2 times and 2.2 times, respectively. Incorporating these adsorbents into the pervious concrete not only improves the pore structure but also significantly enhances the removal of NH??-N and Cu2?. Although the compressive strength slightly decreases with increasing adsorbent dosage, the optimal mix ratio still meets the minimum required grade for pervious concrete, and the permeability is notably improved.