To reduce waste volumes and recover valuable products, char was synthesized via co-pyrolysis of rice straw (RS) with spent tires, sulfur wastes, and CO₂. The inclusion of wastes and CO₂ in pyrolysis of RS was hypothesized to enhance the sorption ability of char for various contaminants, including 2,4-dinitrotoluene (DNT), 2,4-dichlorophenol (DCP), lead, barium, chromate (CrO₄²⁻), and selenate (SeO₄²⁻). Using a lab-scale electrical furnace, the co-pyrolysis was conducted, and the soprtion capacity of char was evaluated via a series of batch sorption experiments. The maximum sorption capacity of spent tire–RS char for DNT was 16.8 ± 0.2 mg g⁻¹, much higher than that of RS biochar (10.1 ± 0.3 mg g⁻¹) due to increasing carbon content from the spent tires. The sorption of DCP to the spent tire–RS char was also enhanced via hydrophobic sorption to carbon residues, although not to the same degree of DNT due to deprotonation of the DCP. Compared with RS biochar, co-pyrolysis with raw sulfur wastes and CO₂ enhanced sorption of lead, barium, and chromate, which can be attributed to increased cation and anion exchange capacities resulting from developments of oxygen or sulfur-containing functional groups. Sorption of selenate was strongly affected by pH. The results suggest that co-pyrolysis of agricultural and industrial wastes and CO₂ is a promising option for the final waste disposal and the production of valuable char, which can be selectively customized for various types of contaminants as sorbents.

为了减少废物量和回收有价值的产品，通过稻草 (RS) 与废旧轮胎、硫废物和 CO ₂的共热解合成炭。假设在 RS 的热解中包含废物和 CO ₂以增强炭对各种污染物的吸附能力，包括 2,4-二硝基甲苯 (DNT)、2,4-二氯苯酚 (DCP)、铅、钡、铬酸盐 (CrO ₄ ^2- ) 和硒酸盐 (SeO ₄ ^2- )。使用实验室规模的电炉进行共热解，并通过一系列批次吸附实验评估炭的吸附能力。废旧轮胎-RS 炭对 DNT 的最大吸附容量为 16.8 ± 0.2 mg g ^-1，远高于 RS 生物炭 (10.1 ± 0.3 mg g ^-1 )，因为废轮胎的碳含量增加。DCP 对废轮胎-RS 炭的吸附也通过对碳残留物的疏水吸附而得到增强，尽管由于 DCP 的去质子化而没有达到与 DNT 相同的程度。与 RS 生物炭相比，与生硫废物和 CO ₂的共热解增强了铅、钡和铬酸盐的吸附，这可归因于含氧或含硫官能团的发展导致阳离子和阴离子交换容量增加。硒酸盐的吸附受 pH 值的影响很大。结果表明，农业和工业废物与CO _{2的共热解}是最终废物处理和有价值炭生产的有前途的选择，可以针对各种类型的污染物作为吸附剂进行选择性定制。