Super-effective biochar adsorbents from Co-pyrolysis of rice husk and sewage sludge: Adsorption performance, advanced regeneration, and economic analysis
Behnam Rezvani , Ahmad Hallajisani , Omid Tavakoli
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引用次数: 0
Abstract
This study investigates the co-pyrolysis of rice husk and sewage sludge to produce unmodified biochar (UBC) and modified biochar (MBC) for contaminant removal. The maximum alizarin red S (ARS) adsorption appeared in sewage sludge to rice husk ratio of 0.8:0.2 and pyrolysis temperature of 400 °C. The biochar was modified by acid treatment using hydrochloric acid, nitric acid, and phosphoric acid. Various factors of the adsorption were evaluated. The adsorbents had remarkable adsorption capacities. The maximum adsorption capacity of the MBCs reached 1466.38 to 1524.18 mg/g. The adsorption process followed pseudo-second-order kinetics and the Freundlich isotherm model. Fourier transform infrared (FTIR) analysis showed the diverse functional groups. Brunauer-Emmett-Teller (BET), Field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), and Thermogravimetric analysis (TGA) were utilized. Furthermore, the UBC was regenerated using solvents and an advanced technique. Additionally, the techno-economic significance of the biochar production was assessed.
研究了稻壳和污水污泥共热解制备未改性生物炭（UBC）和改性生物炭（MBC）去除污染物的方法。污泥与稻壳比为0.8:0.2、热解温度为400℃时，对alizarin red S （ARS）的吸附量最大。采用盐酸、硝酸和磷酸对生物炭进行酸处理。对吸附的各种因素进行了评价。吸附剂具有显著的吸附能力。MBCs的最大吸附容量为1466.38 ~ 1524.18 mg/g。吸附过程符合拟二级动力学和Freundlich等温模型。傅里叶红外变换（FTIR）分析显示其官能团分布多样。采用布鲁诺尔-埃米特-泰勒（BET）、场发射扫描电镜（FESEM）、能量色散x射线能谱（EDS）和热重分析（TGA）进行分析。此外，利用溶剂和先进的技术对UBC进行了再生。此外，还对生物炭生产的技术经济意义进行了评价。
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