Low-cost adsorbents were tested to remove anionic surfactants from laundry rinsing water to allow re-use of water. Adsorbents were selected corresponding to the different surfactant adsorption mechanisms. Equilibrium adsorption studies of linear alkyl benzene sulfonate (LAS) show that ionic interaction results in a high maximum adsorption capacity on positively charged adsorbents of 0.6–1.7 g LAS/g. Non-ionic interactions, such as hydrophobic interactions of LAS with non-ionic resins or activated carbons, result in a lower adsorption capacity of 0.02–0.6 g LAS/g. Negatively charged materials, such as cation exchange resins or bentonite clay, have negligible adsorption capacities for LAS. Similar results are obtained for alpha olefin sulfonate (AOS). Cost comparison of different adsorbents shows that an inorganic anion exchange material (layered double hydroxide) and activated carbons are the most cost-effective materials in terms of the amount of surfactant adsorbed per dollar worth of adsorbent.
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机译：测试了低成本的吸附剂，可从衣物漂洗水中去除阴离子表面活性剂，从而可重复使用水。根据不同的表面活性剂吸附机理选择吸附剂。线性烷基苯磺酸盐（LAS）的平衡吸附研究表明，离子相互作用导致对带正电荷的吸附剂0.6-1.7 g LAS / g的最大吸附容量。非离子相互作用，例如LAS与非离子树脂或活性炭的疏水相互作用，会导致0.02-0.6 g LAS / g的较低吸附容量。带负电荷的材料，例如阳离子交换树脂或膨润土，对LAS的吸附能力可忽略不计。对于α-烯烃磺酸盐（AOS），获得了相似的结果。不同吸附剂的成本比较表明，就每美元吸附剂而言，就表面活性剂的吸附量而言，无机阴离子交换材料（层状双氢氧化物）和活性炭是最具成本效益的材料。
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