Isabel Lima - Academia.edu (original) (raw)

Papers by Isabel Lima

Thesis (Ph. D.)--University of California, Davis, 1996. Degree granted in Engineering.

Industrial Crops and Products, 2015

ABSTRACT Biochars were produced by pyrolysis of sugarcane bagasse (350◦C and 700◦C) and pine wood... more ABSTRACT Biochars were produced by pyrolysis of sugarcane bagasse (350◦C and 700◦C) and pine wood (400◦C)and are abbreviated BC350, BC700, and WC400, respectively. Metribuzin adsorption by batch equilibrium showed that BC700 had the greatest adsorption capacity followed by BC350 and WC400. The bagasse biochars were mixed with clay and a silt loam soil and the pine wood biochar with a loamy sand soil andfortified with the metribuzin and pendimethalin. The soils were incubated at 25◦C in the dark and were extracted with methanol after 0, 7, 14, 21, 28, 42, 63, 86, and 111 days. Parent compounds and metribuzin degradates were analyzed in extracts by HPLC – mass spectrometry. Increases in metribuzin half life (DT50)were indicated for all soil-biochar combinations. BC350 had the greatest impact, doubling the DT50in the silt loam soil. In contrast, BC700 had minimal impact on the DT50in the silt loam soil and contributed toa significant DT50decrease in the clay. The metribuzin degradate, metribuzin-desamino, was detected at rates proportional to metribuzin dissipation. For pendimethalin, biochar additions increased DT50in allsoil-biochar combinations. In contrast to metribuzin, BC700 and WC400 had the greatest impact with theBC700 increasing the DT50more than 2-fold. In the loamy sand soil, the 1–4% biochar rate contributed to an increased trend in palmer amaranth emergence. At the 8% rate, palmer amaranth emergence was statistically higher than the control (p = 0.072). In sum, how biochar impacted the activity and dissipation of these herbicides depended on soil, herbicide, and biochar properties.

Journal of Agricultural and Food Chemistry

Effects of biomass types (bark mulch vs. sugar beet pulp) and carbonization processing conditions... more Effects of biomass types (bark mulch vs. sugar beet pulp) and carbonization processing conditions (temperature, residence time, and the phase of reaction medium) on the chemical characteristics of hydrochars were examined by elemental analysis, solid-state 13C NMR, and chemical and biochemical oxygen demand measurements. Bark hydrochars were more aromatic than sugar beet hydrochars produced at the same processing conditions. The presence of lignin in bark led to a much lower biochemical oxygen demand (BOD) of bark than sugar beet and the increasing trends of BOD after carbonization. Compared with those prepared at 200 ºC, 250 ºC hydrochars were more aromatic and depleted of carbohydrates. Longer residence time (20 h vs. 3 h) at 250 ºC resulted in the enrichment of nonprotonated aromatic carbons. Both bark and sugar beet pulp underwent deeper carbonization during water hydrothermal carbonization than steam hydrothermal carbonization (200 ºC, 3 h) in terms of more abundant aromatic C ...

Chemosphere, 2014

Biochars have been considered for adsorption of contaminants in soil and water, as well as condit... more Biochars have been considered for adsorption of contaminants in soil and water, as well as conditioning and improving soil quality. Pore surface area is an important property of biochar. Biochars were created from shells of two almond varieties with different ash content. The pyrolysis was performed at 650 and 800°C for 40-240min. Significant surface areas developed at the higher temperature and at pyrolysis times of 120min and longer. Washing the materials in synthetic rainwater removed ash and exposed additional surface area, particularly in small-diameter pores. When results from low-ash almond shell biochars were compared with high-ash almond shell biochars, it was found that the pore distribution was more uniform for the high-ash starting material and almost independent of pyrolysis time or washing. The result from the washing study is important as it suggested that adsorptive properties may change once biochars are exposed to rainwater.

Biochar additions to degraded soils have the potential to improve crop yield and soil quality. We... more Biochar additions to degraded soils have the potential to improve crop yield and soil quality. We hypo- thesize that the biochar production process can be tailored to form designer biochars that have specific chemical characteristics matched to selective chemical and/or physical issues of a degraded soil. We produced biochars from peanut hulls, pecan shells, poultry litter, and switchgrass at temperatures

Proceedings of the Water Environment Federation, 2003

Page 1. 1 POULTRY BIOSOLIDS AS GRANULAR ACTIVATED CARBONS FOR METAL ION ADSORPTION Isabel M. Lima... more Page 1. 1 POULTRY BIOSOLIDS AS GRANULAR ACTIVATED CARBONS FOR METAL ION ADSORPTION Isabel M. Lima1, Wayne E. Marshall1, Kari B. Fitzmorris2 and Robert S. Reimers2 1United States Department of Agriculture ...

International Symposium on Air Quality and Waste Management for Agriculture, 16-19 September 2007, Broomfield, Colorado, 2007

Journal of Applied Poultry Research - J APPL POULTRY RES, 2009

The quantity of poultry manure generated each year is large, and technologies that take advantage... more The quantity of poultry manure generated each year is large, and technologies that take advantage of the material should be explored. At the same time, increased emphasis on the reduction of mercury emissions from coal-fired electric power plants has resulted in environmental regulations that may, in the future, require application of activated carbons as mercury sorbents. The sorbents could be injected into the flue gas stream, where they could adsorb the mercury. The sorbents (now containing mercury) would be removed via filtration or other means from the flue gas. Our preliminary work has demonstrated that activated carbon made from poultry manure can adsorb mercury from air with good efficiency. In laboratory experiments, an activated carbon made from turkey cake manure removed the majority of elemental mercury from a hot air stream. Other activated carbons made from chicken and turkey litter manure were also efficient. In general, unwashed activated carbons made from poultry ma...

Water Environment Research, 2006

Waste and Biomass Valorization, 2013

Starch - Stärke, 2010

Rice flour from long, medium, and waxy grain cultivars were processed by passing a 32% rice flour... more Rice flour from long, medium, and waxy grain cultivars were processed by passing a 32% rice flour slurry through a microfluidizer at 10 × 10 4 kPa and spray dryer at three different outlet temperatures (50, 80, and 115°C). Spray-drying conditions were controlled by the flow rate of the slurry ...

Journal of Texture Studies, 2001

A restructured potato model system was fried for 5. 10 or 15 min at 170, 180, or 190C and tested ... more A restructured potato model system was fried for 5. 10 or 15 min at 170, 180, or 190C and tested in a dynamic mechanical analyzer. Stress relaration phenomena was described by a two-element Maxwell model with a parallel spring. The viscoelastic behavior of the crust resulted from ...