Recently, the recycling of kerf loss silicon waste has trigged much attention due to the rapid growth of PV market. In this study, 3-aminopropylethoxysilane (APTES)-functionalized nanoporous silicon (NPSi) hybrid materials were prepared by nanosilver-assisted chemical etching (Ag-ACE) of kerf loss silicon waste derived from diamond-wire saw cutting silicon ingot process. The resulting APTES-NPSi indicated high-effective adsorption ability of Cr(VI) from aqueous solution, which was highly pH dependent, and the maximum adsorption capacity reached up to 103.75 mg/g after 60 min at room temperature. The adsorption kinetics and adsorption isotherms were in good agreement with pseudo-second-order model and Langmuir isotherm. Additionally, the Cr(VI) up-take mechanism was carefully investigated and ascribed to the Cr(VI) adsorption on the protonated anime groups by chemical chelating reaction in which the Cr(VI) was reduced to Cr(III). It was worth mentioning that the APTES-NPSi maintained excellent adsorption capacity after five successive regenerated cycles. Therefore, the work would pave the way for recycling of silicon cutting waste and the potential of Cr(VI) removal from aqueous solution based on the modified NPSi.

中文翻译：

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基于由缝隙损耗硅废料制备的APTES改性纳米多孔硅，可从水溶液中有效去除六价铬。

最近，由于光伏市场的快速增长，切缝损耗硅废料的回收引起了人们的广泛关注。在这项研究中，通过纳米银辅助化学刻蚀（Ag-ACE）制备了3-氨基丙基乙氧基硅烷（APTES）-功能化的纳米多孔硅（NPSi）杂化材料，该金刚石刻线切割硅锭工艺产生的切口损耗硅废料。所得的APTES-NPSi对水溶液中Cr（VI）的高效吸附能力具有很高的pH依赖性，并且在室温下放置60分钟后，最大吸附能力达到103.75 mg / g。吸附动力学和吸附等温线与拟二阶模型和Langmuir等温线吻合良好。另外，Cr（VI）的吸收机理经过仔细研究，归因于通过化学螯合反应将Cr（VI）还原为Cr（III），从而使Cr（VI）吸附在质子化的动漫基团上。值得一提的是，APTES-NPSi在连续五个再生循环后仍保持出色的吸附能力。因此，这项工作将为回收硅切削废料和基于改性NPSi从水溶液中去除Cr（VI）的潜力铺平道路。