Zhang Qiao-Chu, Wang Cheng-Chen, Cheng Jin-Hua, Zhang Cheng-Liang, Yao Jing-Jing
School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China.
Institute of Environmental Remediation and Human Health, Southwest Forestry University, Kunming 650225, China.
Materials (Basel). 2021 Jun 11;14(12):3243. doi: 10.3390/ma14123243.
Garden waste is one of the main components of urban solid waste which affects the urban environment. In this study, garden waste of (SS), (BY), (LS), (YS), (GH) and () (CB) was pyrolyzed at 300 °C, 500 °C, 700 °C to obtain different types of biochar, coded as SSB300, SSB500, SSB700, BYB300, etc., which were tested for their Cr (VI) adsorption capacity. The results demonstrated that the removal efficiency of Cr by biochar pyrolyzed from multiple raw materials at different temperatures was variable, and the pH had a great influence on the adsorption capacity and removal efficiency. GHB700 had the best removal efficiency (89.44%) at a pH of 2 of the solution containing Cr (VI). The pseudo second-order kinetics model showed that Cr (VI) adsorption by biochar was chemisorption. The Langmuir model showed that the adsorption capacity of SSB300 was the largest (51.39 mg·g), BYB500 was 40.91 mg·g, GHB700, CBB700, LSB700, YSB700 were 36.85 mg·g, 36.54 mg·g, 34.53 mg·g and 32.66 mg·g, respectively. This research, for the first time, used a variety of garden wastes to prepare biochar, and explored the corresponding raw material and pyrolysis temperature for the treatment of Cr (VI). It is hoped to provide a theoretical basis for the research and utilization of garden wastes and the production and application of biochar.
园林废弃物是影响城市环境的城市固体废弃物的主要组成部分之一。在本研究中，将（SS）、（BY）、（LS）、（YS）、（GH）和（）（CB）的园林废弃物在300℃、500℃、700℃下进行热解以获得不同类型的生物炭，编码为SSB300、SSB500、SSB700、BYB300等，并对其Cr（VI）吸附能力进行测试。结果表明，不同温度下由多种原料热解得到的生物炭对Cr的去除效率各不相同，且pH值对吸附容量和去除效率有很大影响。在含Cr（VI）溶液pH为2时，GHB700的去除效率最佳（89.44%）。准二级动力学模型表明生物炭对Cr（VI）的吸附为化学吸附。Langmuir模型表明，SSB300的吸附容量最大（51.39 mg·g），BYB500为40.91 mg·g，GHB700、CBB700、LSB700、YSB700分别为36.85 mg·g、36.54 mg·g、34.53 mg·g和32.66 mg·g。本研究首次使用多种园林废弃物制备生物炭，并探索了处理Cr（VI）的相应原料和热解温度。希望为园林废弃物的研究利用以及生物炭的生产应用提供理论依据。
