School of Agriculture and Biology, Key Laboratory of Urban Agriculture (South), Ministry of Agriculture, Shanghai Jiao Tong University, Shanghai, PR China.
Bioresour Technol. 2013 Apr;133:495-9. doi: 10.1016/j.biortech.2013.01.114. Epub 2013 Feb 7.
Three different biochars as cost-effective substitutes for activated carbon (AC) were tested for their hydrogen sulfide (H2S) adsorption ability. The biochars were produced from camphor (SC), bamboo (SB), and rice hull (SR) at 400°C by oxygen-limited pyrolysis. The surface area (SA), pH, and Fourier transform infrared spectras of the biochars and AC were compared. The maximum removal rates and the saturation constants were obtained using the Michaelis-Menten-type equation. The three biochars were found to be alkaline, and the SAs of the biochars were much smaller than that of the AC. The H2S breakthrough capacity was related to the local pH within the pore system of the biochar. The order observed in terms of both biochar and AC adsorption capacity was SR>SB>SC>AC. SR efficiently removed H2S within the inlet concentration range of 10-50 μL/L. Biochars derived from agricultural/forestry wastes are a promising H2S adsorbent with distinctive properties.
三种不同的生物炭被用作成本效益高的活性炭 (AC) 的替代品，用于测试其对硫化氢 (H2S) 的吸附能力。生物炭是由樟木 (SC)、竹子 (SB) 和稻壳 (SR) 在 400°C 下通过限氧热解制成的。比较了生物炭和 AC 的比表面积 (SA)、pH 值和傅里叶变换红外光谱。使用米氏方程获得了最大去除率和饱和常数。发现这三种生物炭均呈碱性，且生物炭的比表面积远小于 AC。H2S 的穿透容量与生物炭孔系统内的局部 pH 值有关。就生物炭和 AC 的吸附能力而言，观察到的顺序为 SR>SB>SC>AC。SR 在 10-50 μL/L 的入口浓度范围内可有效去除 H2S。源自农业/林业废弃物的生物炭是一种很有前途的 H2S 吸附剂，具有独特的性质。
