State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
J Environ Sci (China). 2011;23(8):1293-8. doi: 10.1016/s1001-0742(10)60575-x.
A novel adsorbent named lipoid adsorption material (LAM), with a hydrophobic nucleolus (triolein) and a hydrophilic membrane structure (polyamide), was synthesized to remove hydrophobic organic chemicals (HOCs) from solution. Triolein, a type of lipoid, was entrapped by the polyamide membrane through an interfacial polymerization reaction. The method of preparation and the structure of the LAM were investigated and subsequent experiments were conducted to determine the characteristics of atrazine (a type of HOC) removal from wastewater using LAM as the adsorbent. The results showed that LAM had a regular structure compared with the prepolymer, where compact particles were linked with each other and openings were present in the structure of the LAM in which the fat drops formed from triolein were entrapped. In contrast to the atrazine adsorption behavior of powdered activated carbon (PAC), LAM showed a persistent adsorption capacity for atrazine when initial concentrations of 0.57, 1.12, 8.31 and 19.01 mg/L were present, and the equilibrium time was 12 hr. Using an 8 mg/L initial concentration of atrazine as an indicator of HOCs in aqueous solution, experiments on the adsorption capacity of the LAM showed 69.3% removal within 6-12 hr contact time, which was close to the 75.5% removal of atrazine by PAC. Results indicated that LAM has two atrazine removal mechanisms, namely the bioaccumulation of atrazine by the nucleous material and physical adsorption to the LAM membrane. Bioaccumulation was the main removal mechanism.
一种名为脂吸附材料（LAM）的新型吸附剂被合成出来，用于从溶液中去除疏水性有机化学品（HOCs）。LAM 具有疏水性核（三油酸甘油酯）和亲水膜结构（聚酰胺）。三油酸甘油酯是一种脂类，通过界面聚合反应被聚酰胺膜包裹。研究了 LAM 的制备方法和结构，并进行了后续实验，以确定 LAM 作为吸附剂从废水中去除莠去津（一种 HOC）的特性。结果表明，与预聚物相比，LAM 具有规则的结构，其中紧密相连的颗粒之间存在开口，开口内包裹着三油酸甘油酯形成的脂肪滴。与粉末状活性炭（PAC）对莠去津的吸附行为相比，LAM 对莠去津表现出持续的吸附能力，当初始浓度分别为 0.57、1.12、8.31 和 19.01mg/L 时，平衡时间为 12 小时。以初始浓度为 8mg/L 的莠去津作为水溶液中 HOCs 的指示剂，LAM 的吸附容量实验表明，在 6-12 小时的接触时间内，去除率达到 69.3%，接近 PAC 对莠去津的 75.5%去除率。结果表明，LAM 有两种去除莠去津的机制，即核材料对莠去津的生物积累和对 LAM 膜的物理吸附。生物积累是主要的去除机制。
