中国稻米

中国稻米

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水稻壳生物炭对苯酚的吸附特性研究

  1. 陕西中医药大学/陕西省中药资源产业化协同创新中心/陕西省中药基础与新药研究重点实验室/陕西省风湿与肿瘤类中药制剂工程技术研究中心，陕西 咸阳 712083
  • 出版日期:2019-09-20 发布日期:2019-09-20
  • 基金资助:

    国家自然科学基金（51679085）；陕西中医药大学科研基金（2015PY10）

Adsorption Characteristics of Phenol from Aqueous Solution Using Rice Husk Biochar

  • Online:2019-09-20 Published:2019-09-20

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摘要：

为促进水稻壳的资源化利用，以水稻壳为材料，采用慢速热解技术于300℃、400℃、500℃条件下制备生物炭吸附剂（BC300、BC400、BC500），检测其去除水中苯酚的效果。吸附试验结果表明，生物炭的制备温度显著影响其对苯酚的吸附效果，3种温度制备的生物炭对苯酚的吸附能力表现为BC500>BC400>BC300。此外，苯酚的初始浓度、吸附温度和时间等因素均能影响吸附效果。25℃下苯酚初始浓度为20 mg/L时，BC500对苯酚的去除率最高，达98%；生物炭对苯酚的等温吸附线符合Langmuir模式和Freundlich模式。研究结果探明了水稻壳制备生物炭吸附剂去除苯酚的最适条件，可为水稻壳应用于苯酚等有机污染物的去除提供理论依据。

关键词: 生物炭, 水稻壳, 苯酚

Abstract:

The rice husk was used as raw material to prepare the biochar adsorbent at 300℃, 400℃ and 500℃, which were named BC300, BC400 and BC500. Phenol was subject to batch adsorption in aqueous medium by the prepared rice husk. The results of adsorption experiments showed that the preparation temperature of biochar significantly affected its adsorption effect on phenol. The adsorption capacity of phenol from three kinds of biochar was BC500> BC400> BC300. In addition，the initial concentration of phenol in waste water, the temperature and time of adsorption could also affect the adsorption effect. When the initial concentration of phenol was 20 mg/L and the adsorption temperature was 25℃, the removal rate of phenol was up to 98% after BC500 adsorption. The isothermal adsorption line for phenol conforms to the Langmuir mode and the Freundlich mode. The results of the study found out the optimum conditions for the removal of phenol by biochar adsorbent from rice husk. It could provide a theoretical basis for removing organic pollutants such as phenol from rice husk.

Key words: biochar, rice husk, phenol

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