Xu Jia, Fu Meiyuan, Ma Qianhui, Zhang Xiaopeng, You Chenghang, Shi Zaifeng, Lin Qiang, Wang Xianghui, Feng Wen
Key Laboratory of Water Pollution Treatment and Resource Rouse of Hainan Province, Key Laboratory of Soil Pollution Remediation and Resource Utilization of Haikou, College of Chemistry and Chemical Engineering, Hainan Normal University Haikou 571158 China.
State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan Provincial Key Lab of Fine Chemistry, School of Chemical Engineering and Technology, Hainan University Haikou 570228 China.
RSC Adv. 2023 May 22;13(22):15327-15333. doi: 10.1039/d3ra00680h. eCollection 2023 May 15.
Algae biochar (ABC), coconut shell biochar (CSBC), and coconut coat biochar (CCBC) were prepared by wet pyrolysis in a phosphoric acid solvent under normal pressure. Materials were characterized for their micromorphology, specific surface area, and surface functional groups by scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) nitrogen adsorption-desorption spectrum technique and Fourier transform infrared diffraction (FT-IR). The evaluation of the liquid-phase adsorption performance using methylene blue (MB) as a pigment model, and the effects of temperature, pH, adsorbent dosage, and pollutant concentration of the MB adsorption onto modified biochars were fully investigated. The adsorption mechanism was proposed based on the adsorption kinetics curve and adsorption isotherm. The synthetic biochar showed great adsorption properties toward cationic dyes rather than anionic dyes. Specifically, the adsorption abilities for algal biochar, coconut shell biochar, and coconut coat biochar were determined to be 97.5%, 95.4% and 21.2%, respectively. The isothermal adsorption of MB by the three kinds of biochar conformed to the Langmuir equation, and the adsorption process fitted to the quasi-second-order kinetic equation, which suggested that ABC and CSBC effectively adsorbed MB dye molecules through hydrogen bonding, π-π stacking, and electrostatic interactions.
藻类生物炭（ABC）、椰壳生物炭（CSBC）和椰壳纤维生物炭（CCBC）通过在常压下于磷酸溶剂中进行湿法热解制备而成。采用扫描电子显微镜（SEM）、布鲁诺尔-埃米特-泰勒（BET）氮吸附-脱附光谱技术以及傅里叶变换红外衍射（FT-IR）对材料的微观形貌、比表面积和表面官能团进行了表征。以亚甲基蓝（MB）作为色素模型对液相吸附性能进行了评估，并全面研究了温度、pH值、吸附剂用量以及MB吸附到改性生物炭上的污染物浓度的影响。基于吸附动力学曲线和吸附等温线提出了吸附机理。合成生物炭对阳离子染料而非阴离子染料表现出优异的吸附性能。具体而言，藻类生物炭、椰壳生物炭和椰壳纤维生物炭的吸附能力分别确定为97.5%、95.4%和21.2%。三种生物炭对MB的等温吸附符合朗缪尔方程，吸附过程符合准二级动力学方程，这表明ABC和CSBC通过氢键、π-π堆积和静电相互作用有效地吸附了MB染料分子。
