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| 成型马尾松针对含铬废水中Cr（Ⅵ）的去除 |
| Cr (Ⅵ)removal from wastewater using molded masson pine needles |
| 投稿时间：2018-11-21 |
| DOI：10.13254/j.jare.2018.0326 |
| 中文关键词: 成型马尾松针，制备，吸附，Cr（Ⅵ），去除机理，动力学模型 |
| 英文关键词: molded masson pine needles, preparation, adsorption, Cr（Ⅵ）, removal mechanisms, kinetic modeling |
| 基金项目:国家自然科学基金项目（51668006，21576055） |
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| 中文摘要: |
| 以废弃的马尾松针为原材料，制备了易回收的成型马尾松针，并用于含铬（Cr）废水的吸附。通过磷酸与羧甲基纤维素钠反应将废弃马尾松针成型化，以重铬酸钾溶液作为模拟含铬废水，研究吸附剂投加量、pH、初始浓度等对成型马尾松针吸附Cr（Ⅵ）的影响。结果表明：成型马尾松针对水中Cr（Ⅵ）具有良好的去除效果，质量浓度为10 mg·L-1的Cr（Ⅵ）溶液，吸附剂投加量为10.0 g·L-1时，Cr（Ⅵ）去除率达到99%；成型马尾松针对Cr（Ⅵ）的吸附是一个先快速吸附、后缓慢达到平衡的过程，对于10 mg·L-1的Cr（Ⅵ）溶液，最终吸附平衡时间为6 h。马尾松针对Cr（Ⅵ）的去除率随着pH的升高而降低，在pH 1~4时，去除率超过90%；成型马尾松针对Cr（Ⅵ）的吸附符合Freundlich模型，吸附过程可以由准一级动力学模型描述；成型马尾松针去除Cr（Ⅵ）的主要机制是静电吸附、氧化还原和络合作用。研究表明，成型马尾松针在去除Cr（Ⅵ）方面具有良好的潜力，可实现废弃生物质资源的循环利用和废水中有毒重金属去除的双重目标。 |
| 英文摘要: |
| Easily recycled molded masson pine needles were prepared using waste masson pine needles as raw materials and their adsorption performance for Cr(Ⅵ) in wastewater was investigated. Abscised masson pine needles were molded by reaction of phosphoric acid and sodium carboxymethylcellulose. A potassium dichromate solution was used as simulated wastewater to study the effects of adsorbent dosage, pH, and initial concentration on the adsorption of Cr(Ⅵ) by molded masson pine needles. Results showed that molded masson pine needles could effectively adsorb Cr(Ⅵ) from aqueous solution. Molded masson pine needles adsorbed 99% Cr(Ⅵ) for 10 mg·L-1 Cr(Ⅵ) solution with a 10.0 g·L-1 adsorbent dosage. Cr(Ⅵ) was initially rapidly adsorbed onto molded masson pine needles and then slowly reached equilibrium. For 10 mg·L-1 Cr (Ⅵ), the adsorption approached an equilibrium after 6 h. Cr (Ⅵ) removal by masson pine needles decreased with increase in pH. Notably, Cr(Ⅵ) adsorption remained stable at above 90% within a pH of 1~4. Cr(Ⅵ) adsorption on molded masson pined needles strongly followed the Freundlich model and adsorption kinetics closely followed the pseudo-first order model. The main Cr(Ⅵ) adsorption mechanisms were attributed to electrostatic attraction, oxidation-reduction, and complexation. In conclusion, molded masson pine needles have good potential for Cr(Ⅵ) removal, which is useful for both reclamation of biomass wastes and removal of hazardous heavy metals. |
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