气液反应广泛应用于纳米材料的制备中。本文首次利用中空纤维膜气液接触器制备了纳米CaCO3、SrCO3、Al(OH)3、Al2O3粒子和介孔SnO2。在膜气液接触器中，气液进行非分散式接触，微孔膜提供了稳定而巨大的界面面积，过程能耗低，易于放大，气体可被完全吸收，属于绿色高效的气液反应过程。根据气液反应理论，预测了连续操作和半间歇两种操作模式中液相浓度、CO2分压、液相流速等对CO2吸收速率的影响规律，并通过实验测定予以验证；同时，研究了液相浓度、CO2分压、液相流速、添加剂等对粒子形貌和膜污染的影响规律。理论计算表明，连续操作中，Ca(OH)2浓度主要影响增强因子E，吸收速率随液相浓度而缓慢增加；CO2分压主要影响传质推动力，对E影响可忽略，吸收速率与CO2压强成正比；液相流速主要影响kl，对E影响可忽略，吸收速率随流速而增加；基于双膜理论和表面更新理论的计算结果相同，理论计算值与实验测定值吻合较好。在实验条件下，液相浓度、CO2分压和液相流速对粒子形貌的影响不明显，CaCO3粒子粒径在70nm左右，分布均匀。当Ca(OH)2浓度和流速过高，或CO2压强较低时，膜接触器进口处液相压强较高，液体易渗出膜孔，造成外表面污染；膜接触器出口端膜外表面污染很少；膜内表面污染在接触器进口处以原料吸附为主，在出口处污染较少。反应后用稀盐酸清洗膜使之再生，膜重复使用9次，膜传质系数未见明显降低。在半间歇操作中添加PVP 和PEG后，粒度降为48nm左右，分散性提高。所得SrCO3纳米粒子为球形，粒度均匀。Al(OH)3粒子为球形，50nm左右，煅烧后得到Al2O3，粒子尺寸增加至70nm左右。以Na2SnO3-CO2为反应体系，利用膜气液接触反应首先制得SnO2溶胶，然后加入阳离子表面活性剂CTAB作为结构导向剂，经混合、熟化、干燥、焙烧等处理，得到介孔SnO2。采用正交实验法考查了操作条件对产物结构的影响，确定了优化的合成条件。

Gas-liquid reactions are usually employed in the preparation of nanomaterials.Nanosized calcium carbonate, strontium carbonate, aluminium hydroxide, alumina and mesostructured tin oxide were prepared with a gas-liquid membrane contactor for the first time. In the non-dispersive membrane contacting process, the problems often encountered in the conventional apparatus such as flooding, foaming and entrainment can be avoided. The contactors provides large and fixed gas-liquid interface and the process is easily to scale up. The effects of Ca(OH)2 concentration, CO2 partial pressure and liquid flow velocity on the absorption rate in continuous operation and semi-batch operation were estimated according to the gas–liquid reaction theory. The experimental results were provided to verify the theoretical predictions.The influences of operation parameters and additives on particles morphology and the membrane fouling were studied. The theoretical calculation predicts that the Ca(OH)2 concentration affects E and then the absorption rate.The calculated absorption rate per interfacial area increases slowly with the Ca(OH)2 concentration. The CO2 pressure affects the driving force of mass-transfer. The influences of CO2 pressure on E can be negligible under the experimental conditions.The absorption rate is proportional to CO2 pressure The calculated absorption rate increases with the liquid flow velocity, which is solely attributed to the effects of flow velocity on kl. The estimated absorption rates based on the double-film model coincide completely with that on the surface-renewal model.The theoretical predictions are consistent with the experimental results. In the absence of additives, the particles, about 70 nm in size, are not sensitive to Ca(OH)2 concentration and CO2 pressure. When the Ca(OH)2 concentration and the liquid flow velocity are high or the CO2 pressure is low, the relative pressure of liquid phase may be higher than the breakthrough pressure of membranes, resulting in the liquid leakage especially at the entrance of the contactor. At the exit of the contactor, the liquid pressure nears zero,and the liquid leakage can be neglected. The fouling on the membrane inner-surface at the entrance is apparent due to the adsorption of raw materials, but it becomes slight at the exit. In the semi-batch operation, PVP and PEG exhibit good effects on the particles growth and aggregation, and the particles size can be reduced to about 48 nm. The as-obtained SrCO3 nanoparticles are spherical, uniform in size. The alumina hydrates obtained are amorphous, about 50nm in size. After calcining at 800°C for 8 h, the amorphous Al(OH)3 converts to alumina and the particles size increases to 70 nm. After reaction, the membrane was washed with dilute hydrochloric and the membrane can be reused for at least 9 times without apparent performance deterioration. Mesostructured tin oxide was synthesized using cetyltrimethylammonium bromide as the organic template and sodium stannate as the inorganic precursor.The effects of parameters on the product structure were explored by orthogonal experiments, and the synthesis conditions were optimized.