Institute for Nanoscale Science and Technology, College of Science and Engineering, Flinders University, Bedford Park, South Australia 5042, Australia.
College of Science and Engineering, Flinders University, Bedford Park, South Australia 5042, Australia.
Phys Chem Chem Phys. 2022 May 25;24(20):12363-12373. doi: 10.1039/d2cp01903e.
A polymer made from sulfur and limonene was used to coat silica gel and then evaluated as a mercury sorbent. A kinetic model of mercury uptake was established for a range of pH values and concentrations of sodium chloride. Mercury uptake was generally rapid from pH = 3 to pH = 11. At neutral pH, the sorbent (500 mg with a 10 : 1 ratio of silica to polymer) could remove 90% of mercury within one minute from a 100 mL solution containing 5 ppm HgCl and 99% over 5 minutes. It was found that sodium chloride, at concentrations comparable to seawater, dramatically reduced mercury uptake rates and capacity. It was also found that the spent sorbent was stable in acidic and neutral media, but degraded at pH 11 which led to mercury leaching. These results help define the conditions under which the sorbent could be used, which is an important advance for using this material in remediation processes.
一种由硫和柠檬烯制成的聚合物被用来涂覆硅胶，然后将其评估为汞吸附剂。建立了一个汞吸收的动力学模型，涵盖了一系列的 pH 值和氯化钠浓度。从 pH = 3 到 pH = 11，汞的吸收通常很快。在中性 pH 值下，从含有 5 ppm HgCl 的 100 mL 溶液中，每 500 mg 硅胶与聚合物的比例为 10:1 的吸附剂在一分钟内可以去除 90%的汞，5 分钟内可以去除 99%。研究发现，氯化钠的浓度与海水相当，大大降低了汞的吸收速率和容量。还发现，用过的吸附剂在酸性和中性介质中是稳定的，但在 pH 值为 11 时会降解，导致汞浸出。这些结果有助于确定吸附剂可以使用的条件，这是在修复过程中使用这种材料的重要进展。
