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1.
生物质炭对于土壤中不同形态氮库的含量影响已有较多研究,但对西南喀斯特区石灰性土壤氮素形态,尤其是控制氮素形态的转化过程研究较为缺乏。本研究设置土壤中添加1%(C1)和3%(C2)蔗渣生物质炭2个用量水平,并以不施用蔗渣生物质炭作为对照(CK),共3个处理,通过 15 NH 4 NO 3 和NH^15 4 NO 3 成对标记技术,结合MCMC氮素转化模型研究了不同用量的蔗渣生物质炭对石灰性土壤氮转化过程的短期影响,为该地区蔗渣资源化利用和土壤氮保持提供理论支撑。结果表明,与CK相比,添加蔗渣生物质炭能够快速提高土壤pH和有机碳含量。添加生物质炭并没有显著改变土壤氮的矿化、铵态氮(NH^+ 4 )和硝态氮(NO^- 3 )的微生物同化和异养硝化速率,但NH^+ 4 吸附速率随生物质炭用量的增加而提高,以添加量最高的C2处理最大。添加生物质炭同样提高了土壤NH^+ 4 释放速率,但C1和C2处理的土壤NH^+ 4 释放速率并无显著性差异。与CK和C1处理相比,施用高量蔗渣生物质炭通过抑制自养硝化速率而显著降低了硝态氮净产生速率。这些结果表明,施用高量蔗渣生物质炭于石灰性土壤中可快速实现对NH^+ 4 吸附,降低自养硝化速率,减少NO^- 3 产生,从而降低了其损耗和淋失风险。  相似文献   

2.
黏土掺入生物炭后的持水特性及其影响机制   总被引：1，自引：0，他引：1  
李明玉  孙文静 《岩土力学》2019,40(12):4722-4730
生物炭具有疏松多孔、高比表面积和强吸附等特性,在土体改良以及修复受污染土体方面展现出应用潜力。添加生物炭可改善土体结构,进而增强土体持水特性等,其中,生物炭掺量和粒径对改良效果有较大的影响。为了研究生物炭掺量和粒径对生物炭?黏土混合土持水特性的影响,通过蒸汽平衡法控制土样的吸力,确定吸力平衡后土样的含水率和体积等,得到吸湿过程中不同生物炭掺量（0%、5%、10%和15%）、不同粒径范围（＞74、40～74、20～40 μm和＜74 μm）生物炭?黏土混合土在高吸力（3.29～286.7 MPa）范围的土?水特征曲线,并结合扫描电镜（SEM）和压汞（MIP）试验结果分析其微观孔隙结构。试验结果表明：（1）当掺入生物炭的粒径较小时,随着生物炭掺量的增加,土样的持水特性有较明显的提高,随着掺入生物炭粒径的增大,生物炭掺量对土样的持水特性影响不大。（2）当生物炭的掺量较少时,不同粒径生物炭?黏土混合土的土?水特征曲线基本相同,随着生物炭掺量提高,小粒径生物炭对混合土持水特性的影响逐渐显现。（3）由生物炭?黏土混合土微观孔隙结构的演变规律进一步阐释生物炭掺量、粒径对生物炭?黏土混合土持水特性的影响机制。  相似文献   

3.

Biochar is a carbon-rich and low microbial degrading material obtained after pyrolysis of biomass in the absence or limited content of oxygen. The impact of biochar on hydraulic properties of soil is extensively studied in agricultural and geotechnical or geoenvironmental engineering for potential application in bioengineered structures. While a little study is conducted to assess its effect on soil mechanical properties, especially shear strength. However, the effect of biochar on the combined shear strength and compaction characteristics of soil is not studied. The shear strength of biochar amended soil is thought to be related to the compaction characteristics. In addition, the effect of biochar on the shear strength of the soil is soil and biochar specific. In this study, an attempt was made to investigate and better understand the effect of biochar on the shear strength and compaction characteristics of a clayey sand for potential application in bioengineered structures. Standard proctor, direct shear and unconfined compression tests were conducted on bare soil and soil amended with 5, 10 and 15% (w/w) biochar. The experimental results revealed that the amendment of biochar from 5 to 15% (w/w) decreased the dry density and increased the shear strength parameters such as cohesion (c) and angle of internal friction (ϕ) of the soil. While it decreased the undrained shear strength (cu) at higher compaction density (> 0.95MDD) and increased at lower compaction density (< 0.9MDD). Thus, in undrained condition, the initial compaction density has a strong influence on the shear strength of biochar amended soil. In addition, the increased c and ϕ and decreased dry density in biochar amended soil is observed to increase the stability of slopes (hypothetical). The increase of c and ϕ is believed to be due to the roughness and active chemicals (functional groups) present on the surface of the biochar. The decreased cu at higher density is believed to be due to the lubricating effect by the higher water content.

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4.
景明  李烨  陈盈余  陈家玮 《现代地质》2014,28(6):1194-1201
生物炭应用在土壤中具有CO2减排、改善土壤性质等作用,研究表明生物炭土壤有助于农作物产量和质量的提高,同时对污染物有较好的吸附效果,能控制其迁移,但对于近年关注的土壤中Cr(Ⅵ)和生物炭的作用研究却很少。通过土柱淋滤实验,研究土壤中添加生物炭后对Cr(Ⅵ)的迁移影响,特别是对其进行模拟酸雨淋滤实验,进一步研究了生物炭土壤对Cr(Ⅵ)的锁定效果。结果表明：仅施加1%的生物炭,就能够大幅度提高土壤系统固定Cr(Ⅵ)的能力,小粒径生物炭对Cr(Ⅵ)的吸附固定能力更加明显,在一定条件下是大粒径的固定吸附量的3倍,在酸雨淋滤作用下也不易解吸,说明生物炭的添加能有效抑制Cr(Ⅵ)在土壤中的迁移,起到原位锁定的作用,这对农田土壤开发治理提供了重要手段和依据。  相似文献   

5.
A plot-scale evaluation of biochar application to agricultural soils was conducted in Tirunelveli, Tamil Nadu, India, to investigate the potential of biochar to improve soil fertility and moisture content. Biochar feedstocks need to be sustainably sourced: several locally available feedstocks (rice husk, cassia stems, palm leaves and sawdust) were analysed as proposed soil amendments so that no single biomass material is depleted to maintain biochar addition. The biochars from different biomass feedstock contained >20% C and were high in macro- and micronutrients. The results suggest that an application rate of 6.6 metric tonnes ha?1 cassia biochar was enough to initiate C-accumulation, which is reflected in an increase in OM and a net reduction in soil bulk density.  相似文献   

6.
为了研究不同类型的生物炭对模拟地下水中去除Cr（Ⅵ）的影响，选用杨木、柳木、桃木和松木为原料，分别在300℃和600℃热解温度下，制备不同粒径、经氯化铁改性的和未改性的20种生物炭，设计了一系列批实验，探究不同种类的生物炭对模拟地下水中Cr（Ⅵ）的去除效果；并采用傅里叶变换红外光谱（FTIR）和X射线近边吸收光谱（XANES）研究了生物炭去除Cr（Ⅵ）的机理。结果表明：在300℃下热解制成的改性生物炭，对Cr（Ⅵ）去除率均达到了99.0%以上；和粒径2 mm的生物炭相比，粒径<0.5 mm的生物炭对Cr（Ⅵ）有更好的去除效果；拟一级动力学方程较好地描述了300℃热解温度下杨木铁改性生物炭（FeCl3BC300Y）对Cr（Ⅵ）的去除过程。XANES分析结果表明，FeCl3BC300Y中的铬以三价的形态（Cr（Ⅲ））存在，FTIR分析表明羟基和羧基参与了Cr（Ⅵ）的去除。生物炭通过氧化还原和络合作用去除Cr（Ⅵ）。铁改性生物炭有望作为可渗透反应墙的填充材料，成为修复Cr（Ⅵ）污染地下水的新型材料。  相似文献   

7.
生物炭修复重金属污染土研究进展   总被引：4，自引：0，他引：4  
随着城市化进程的加快及工业生产的迅速发展,土壤重金属污染日益加剧,对生态环境造成严重的危害。生物炭是缺氧或限氧条件下加热生物质制得的高度芳香化富含碳的固态物质,其在重金属污染土修复方面具有显著效果,受到广泛关注。基于近些年来国内外围绕生物炭修复重金属污染土所取得的研究成果,分别从生物炭的制备及性质、修复效果及其影响因素、修复机理等方面总结了该领域的研究现状及进展,取得如下主要认识:（1）生物炭具有价格低廉,修复效率高,改良土壤、环境友好等优势;（2）生物炭的理化性质主要受原材料和热解温度的影响,采用活化、磁化、氧化和消化等方法能改善生物炭的性质,提高修复效率;（3）生物炭对土壤中重金属迁移性和生物有效性的影响包括两个方面:固定重金属减少生物有效性或者迁移重金属增加生物有效性,后者可通过改性方法来降低重金属的迁移性和生物有效性;（4）生物炭对土体的固化效果一般,但可与其他固化材料共同使用,以改善土体的力学性质;（5）生物炭修复机理固定重金属的效果为:沉淀作用>络合作用>静电作用,离子交换>物理吸附。最后,针对该领域的研究现状,提出了未来的研究重点和方向,主要包括:建立划分生物炭的统一标准;探讨生物炭对多种重金属共同污染的修复效率;阐明生物炭吸附重金属的机理及其贡献率;扩大研究尺度;开展基于生物炭的固化试验及力学性质研究。  相似文献   

8.
将农林废弃物通过不同碳化方式制备成水热炭或生物炭,用于土壤改良和环境污染修复,是当前研究和应用的热点领域。由于受到不同自然条件的长期影响,如环境温度变化,水热炭和生物炭会发生老化作用,从而影响其对污染物的吸附能力,因此,评估老化作用对碳化材料吸附能力的影响是一个重要的科学问题。采用高温和冻融循环2种加速老化方式模拟自然界中的温度变化,对稻壳和玉米秸秆水热炭、生物炭进行老化培养,通过元素分析仪、傅里叶红外光谱分析仪、扫描电子显微镜等手段对老化前后水热炭、生物炭样品的物化性质进行分析,通过批实验对比研究2种新鲜炭材料对Cd(II)及莠去津的吸附能力及吸附稳定性,并研究了30、60、90次老化循环后生物炭和水热炭吸附能力的变化。结果表明,生物炭对Cd(II)和莠去津有良好的吸附稳定性,而水热炭对莠去津的吸附稳定性较差。2种老化作用均使水热炭、生物炭表面含氧官能团增加,从而增强了水热炭、生物炭对Cd(II)和莠去津的吸附能力。在高温和冻融环境中,随着老化时间的持续,生物炭比水热炭更容易受到环境的影响。研究相关成果对于水热炭和生物炭合理应用于不同环境的污染修复具有试验参考价值。  相似文献   

9.
Soil contamination with cadmium has become major concern all over the world because of its adverse impacts on ecosystem health and agricultural land. Soil amendment with biochar may have varied effects on physical and chemical properties of soil. The objective of the study was to explore the impact of sugarcane filter-cake biochar on physiological performance and growth of lettuce in an aged soil. Four different doses (0, 1.5%, 3%, and 5%) of biochar were used in the soil and conditioned for 1 month. After this, lettuce seedlings were grown in the soil. The results showed that the biochar treatment improved the fresh and dry biomass of leaves and roots as well as plant height while diminished the bioavailability of cadmium from the soil. As compared to control, biochar significantly enhanced the chlorophyll content in lettuce leaves. Due to the biochar amendment, the oxidative stress decreased in lettuce shoots over the control. As compared to control, concentration of cadmium in lettuce significantly decreased after the application of biochar. It was concluded that biochar could mitigate the toxicity of cadmium in lettuce by altering the biochemical and physiological processes in cadmium contaminated soil.  相似文献   

10.
Biochar prepared from corn stalks is used as a source of phosphorus in this study. The hypotheses were to investigate effects of biochar applications in clay soil on availability, changes of phosphorus pools and maximum adsorption of phosphorus as well as corn growth. The soil was placed in plastic pots with each contains 3 kg of this soil. Biochar was added at levels of 0 (control), 6.5 (B1), 19 (B2), and 38 (B3) g pot?1. In this experiment, the pot was planted with corn (Zea mays). The results of this study revealed that the biochar application enhanced available phosphorus (Olsen-P) from 11.51 to 17.10 mg kg?1. Adding biochar significantly increased the amount of NH4Cl-P, NaHCO3-Po, and NaOH I-Po fractions (p?≤?0.05), but it significantly decreased HCl-Pi fraction (p?≤?0.05). Addition of biochar at the highest level increased the fresh and dry matter productions by up to about 75 and 48.7%, respectively, compared to the control. The phosphorus uptake by corn plants significantly increased with increasing levels of biochar. The removal efficiency (% sorption) and maximum adsorption (b) of phosphorus increased with increasing level of biochar addition compared to control. Consequently, it is recommended to add biochar produced from corn stalks to the soil in order to substitute phosphate fertilizers.  相似文献   

11.
Biochar is charcoal made from waste biomass and intended to be added to soil to improve soil function and reduce emissions from the biomass caused by natural degradation to CO2. Nitrogen (N) forms in biochar can be complex and their lability likely to be influenced by pyrolysis temperature which, together with the nature of carbon (C), will influence N mineralisation or immobilisation. These complex relationships are poorly understood, yet impact strongly on the potential agronomic value of biochar. In this study, N in different biochar samples produced from human and animal waste streams (biosolids and cow manure; each mixed with eucalyptus wood chips in a 1:1 dry wt. ratio) at different pyrolysis conditions (highest heating temperature 250, 350, 450 and 550 °C) was extracted with 6 M HCl. The acid hydrolysable, extractable N (THN) was fractionated into ammonia N (AN), amino acid N (AAN), amino sugar N (ASN) and uncharacterisable hydrolysable N (UHN). Biochar samples were also treated with 0.167 M K2Cr2O7 acid to determine N potentially available in the long term. An incubation study of the different biochar samples mixed with acid washed sand was conducted at 32 °C for 81 days to study both C and N turnover. During incubation, the CO2 released was trapped in NaOH and quantified. Hydrolysable N decreased as pyrolysis temperature increased from 250 to 550 °C. Fractionation into AN, AAN, ASN and UHN revealed progressive structural rearrangement of N with pyrolysis temperature. Based on HCl hydrolysis and dichromate oxidation results, C and N in biochar became more stable as pyrolysis temperature increased. The ratio of volatile C to THN was a useful indicator of whether net N mineralisation or immobilisation of N in biochar occurred. THN thus seems a sound estimate of the labile N fraction in biochar in the short term; however, dichromate-oxidisable N is probably more meaningful in the long run. Further studies using different types of biochar need to be conducted under more realistic conditions to obtain more information on N availability in biochar once in soil.  相似文献   

12.
Atomic layer deposition (ALD) thin film coating was applied to improve the hydrophilia of biochar derived from black willow. 2 (2Al, 0.82 wt% Al2O3), 5 (5Al, 1.40 wt% Al2O3), and 10 (10Al, 2.36 wt% Al2O3) cycles of alumina ALD were applied. The biochars were characterized by inductively coupled plasma–atomic emission spectroscopy, nitrogen adsorption and desorption, scanning electron microscopy, and Fourier transform infrared spectroscopy. The adsorbents were utilized for the removal of methylene blue (MB) from an aqueous solution to evaluate their adsorption capacities. The 5Al biochar showed the highest adsorption capacity, compared to the uncoated biochar and other Al2O3 coated biochars, due to its improved hydrophilia. The amount of MB adsorbed onto the 5Al biochar was almost three times that adsorbed onto the uncoated biochar during the first hour of adsorption experiments. Adsorption isotherms were modeled with the Langmuir and Freundlich isotherms. The data fit well with the Langmuir isotherm, and the maximum adsorption capacities were found to be 26.8 and 35.0 mg/g at 25 °C for the uncoated biochar and 5Al biochar, respectively. The adsorbed MB amount per square meter achieved 1.3 mg/m2 onto the 5Al biochar, and it was twice the amount on the uncoated biochar. The experimental data were analyzed by pseudo-first-order and pseudo-second-order kinetics models of adsorption. The pseudo-second-order model better describes adsorption kinetic data for the uncoated biochar and 5Al biochar than the pseudo-first-order model does.  相似文献   

13.
Soil aggregation is one of the key properties affecting the productivity of soils and the environmental side effects of agricultural soils. In this study, we aimed to identify whether biochar could be used to improve aggregate stability. A 2-year field experiment was conducted to investigate the effect of biochar application (0, 2.5, 5, 10, 20, 30 and 40 t ha?1) on aggregate characteristics of upland red soil under a rapeseed–sweet potato rotation in subtropical China. Percentage of aggregate destruction (PAD0.25), mean weight diameter (MWD), geometric mean diameter (GMD) and fractal characteristics of soil aggregates were measured using both wet and dry sieving methods. Results showed that applying biochar significantly decreased the percentage of aggregate destruction and soil fractal dimension and increased the MWD and GMD. The optimal amelioration was observed when biochar was applied at a rate of 40 t ha?1. The decline of the fractal dimension of dry aggregates was 2–9 times as much as that of water-stable aggregates in the 0–15 soil layer and 1–4 times in the 15–30 cm soil layer. These results suggested that biochar could improve the resistance of aggregates to stresses and provide scientific strategies for the agricultural production.  相似文献   

14.
生物炭对土壤理化性质影响的研究进展简   总被引：10，自引：0，他引：10  
Biochar is an organic material with high carbon content, most aromatic structure and great stability resulting from high temperature thermal conversion (usually < 700 ℃) of organic materials under the completely or in part anoxic condition. Due to its stable chemical properties, biochar has received widely attention as a strategy to reduce greenhouse gas emissions. In addition, biochar shows great potential in soil improvement and environmental pollution remediation, and provides a comprehensive solution for the global climate change, food crisis and ecological pollution remediation. Biochar is a carbon rich material, in association with porous characteristics and high surface area which are favorable to accumulating soil moisture, to increasing the porosity, to reducing density and bulk density, and to promoting the formation of soil aggregation. All the above soil physical improvement can provide a good environment for the growth of plants. Furthermore, biochar is an ideal acidic soil amendment which can improve the pH of acidic soil. It contains nutrient element which can be directly released into soil, and its surface charge and functional groups are conducive to soil nutrient retention, such as the reduced leaching of NH+4 and NO-3, PO3-4, therefore improve the efficiency of nutrient elements. However, the effect of biochar amendments highly influenced by raw materials and pyrolysis conditions is of inconsistent and sometimes even contrast results can be concluded. In this paper, we summarize the current status and knowledge gaps about the effect of biochar amendments on soil physical and chemical properties and some suggestions are also strengthened. Finally, some possible negative impacts of biochar application and research suggestions are discussed in order to better use of biochar in agriculture.  相似文献   

15.
采用液相还原法成功制备纳米零价铁,并组装出生物质炭负载纳米零价铁复合材料(NZVI/BC)。XRD图谱显示,NZVI/BC由生物质炭(BC)和纳米零价铁(NZVI)两种成分复合而成;SEM图像显示,加入生物质炭之后,NZVI颗粒在炭表面分散良好。研究考察溶液p H值、还原剂投加量、铁/炭比和NO-3初始浓度等因素对NZVI/BC还原性能的影响。结果表明,NZVI/BC显示出优良的还原性能。在相同条件下,反应2 h,NZVI对NO-3的去除率为75%,而NZVI/BC对NO-3的去除率为96%。NZVI/BC是一种具有应用前景的硝态氮净化材料。  相似文献   

16.
A biochar derived from the pyrolysis of excess sludge of sewage treatment plant at 700 °C was used to remove phenanthrene and pyrene from aqueous solution. The adsorption equilibrium for phenanthrene and pyrene was achieved within 7.5 and 15 h, respectively. The adsorption kinetics of phenanthrene and pyrene were well fitted to pseudo-second-order model, and the isotherms were well fitted to Freundlich adsorption isotherm model (R 2 > 0.96). The effect of variation of pH on the adsorption of the biochar was observed to be insignificant. The hydrophobic action and pore filling might be the main mechanisms of the adsorption of phenanthrene and pyrene on the biochar. The density functional theory calculations confirmed that the adsorption depended mainly on the biochar structure and the molecular volumes of phenanthrene and pyrene. Phenanthrene molecule is smaller than the pyrene molecule and therefore showed better adsorption characteristics with the biochar than the pyrene molecule.  相似文献   

17.
This study attempted to examine the effects of biochar amendment together with bio-fertilizer on soybean yield and its qualitative properties, as well as a few chemical properties of soil through a factorial randomized complete block design at three replications in east of Golestan Province (Iran) during 2014. The two factors under study included the following: (1) biochar amendment (in four levels of 0, 2.5, 8, and 16 tons per hectare), (2) bio-fertilizer containing phosphorus and sulfur growth-promoting rhizobacteria (in two levels of inoculation and non-inoculation) applied through foliar feeding. The results of analysis of variance indicated that interactions of biochar amendment and bio-fertilizer on harvest index and grain yield were significant (p ≤?0.01). According to the results of this study, the highest harvest index and oil content were 56.9, and 17.7%, respectively, in the treatment of 8 tons per hectare biochar and inoculation with bio-fertilizer. The lowest harvest index and the lowest oil content were in the control treatment. The interaction of biochar and bio-fertilizer on bulk density and cation exchange capacity was significant (p ≤?0.01). The results of this study demonstrated that biochar affected the amount of residual nitrogen in the soil after harvest, cation exchange capacity (CEC), acidity (pH), and electrical conductivity (EC). The highest grain yield (3440 kg/ha) was in the 8-ton biochar treatment with inoculated bio-fertilizer. Our study concludes that the biochar and bio-fertilizers can improve grain yield of soybean till 51% relative to the control.  相似文献   

18.
磷石膏中的磷在雨水淋滤作用下浸出,将污染堆场附近水体。本研究采用生物炭固化磷石膏中的磷,以减少其对周遭水体的污染。主要通过模拟固化实验和对照浸出实验,分析生物炭用量、反应时间和温度、初始pH值对固化效果的影响,通过XRD、SEM-EDS分析固化后的生成物。实验结果显示,在生物炭用量为25 mg时,单位固化量达到最大值13.20 mg/g;在反应温度T=293 K、初始pH=7条件下,反应平衡时间72 h时浸出液的磷平衡浓度Ce= 1.40 mg/L;温度提升有助于提高生物炭的固化效果,当T=308 K时,浸出液的磷平衡浓度Ce=0.167 mg/L;碱性条件有利于固化反应持续进行,在pH=11条件下,浸出液的磷平衡浓度Ce=0.153 mg/L。实验结果表明生物炭对磷石膏中的磷具有明显的固化效果。磷石膏中的二水硫酸钙溶解后,Ca2+与表面带负电的生物炭结合,在生物炭显微结构的凹陷处,化学吸附溶液中的磷酸根生成了絮状、团簇状的羟基磷灰石(HAP)沉淀,从而使浸出磷得到有效控制。  相似文献   

19.
Waste rock piles from historic mining activities remain unvegetated as a result of metal toxicity and high acidity. Biochar has been proposed as a low-cost remediation strategy to increase soil pH and reduce leaching of toxic elements, and improve plant establishment. In this laboratory column study, biochar made from beetle-killed pine wood was assessed for utility as a soil amendment by mixing soil material from two mine sites collected near Silverton, Colorado, USA with four application rates of biochar (0%, 10%, 20%, 30% vol:vol). Columns were leached seven times over 65 days and leachate pH and concentration of toxic elements and base cations were measured at each leaching. Nutrient availability and soil physical and biological parameters were determined following the incubation period. We investigated the hypotheses that biochar incorporation into acidic mine materials will (1) reduce toxic element concentrations in leaching solution, (2) improve soil parameters (i.e. increase nutrient and water holding capacity and pH, and decrease compaction), and (3) increase microbial populations and activity. Biochar directly increased soil pH (from 3.33 to 3.63 and from 4.07 to 4.77 in the two materials) and organic matter content, and decreased bulk density and extractable salt content in both mine materials, and increased nitrate availability in one material. No changes in microbial population or activity were detected in either mine material upon biochar application. In leachate solution, biochar increased base cations from both materials and reduced the concentrations of Al, Cd, Cu, Pb, and Zn in leachate solution from one material. However, in the material with greater toxic element content, biochar did not reduce concentrations of any measured dissolved toxic elements in leachate and resulted in a potentially detrimental release of Cd and Zn into solution at concentrations above that of the pure mine material. The length of time of effectiveness and specific sorption by biochar is variable by element and the toxic element concentration and acidity of the initial mine material.  相似文献   

20.
Metal-complex dyes are widely used in textile industry, but harmful to the environment and human health due to aromatic structure and heavy metal ions. The objective of this work was to evaluate the adsorption potential of bamboo biochar for the removal of metal-complex dye acid black 172 from solutions. Freundlich model was more suitable for the adsorption process of bamboo biochar than Langmuir isotherm, indicating multilayer adsorption of acid black 172 on a heterogeneous bamboo biochar surface. Adsorption kinetics analysis of pseudo-second-order and Weber–Morris models revealed that intraparticle transport was not the only rate-limiting step. The bamboo biochar exhibited a good adsorption performance even at high ionic strength. Analysis based on the artificial neural network indicated that the temperature with a relative importance of 29 % appeared to be the most influential parameter in the adsorption process for dye removal, followed by time, ionic strength, pH and dye concentration.  相似文献   

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